--- loncom/lonnet/perl/lonnet.pm	2009/03/21 20:56:55	1.991
+++ loncom/lonnet/perl/lonnet.pm	2012/12/05 17:40:59	1.1206
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.991 2009/03/21 20:56:55 raeburn Exp $
+# $Id: lonnet.pm,v 1.1206 2012/12/05 17:40:59 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -75,8 +75,12 @@ use LWP::UserAgent();
 use HTTP::Date;
 use Image::Magick;
 
+
+use Encode;
+
 use vars qw(%perlvar %spareid %pr %prp $memcache %packagetab $tmpdir
-            $_64bit %env %protocol);
+            $_64bit %env %protocol %loncaparevs %serverhomeIDs %needsrelease
+            %managerstab);
 
 my (%badServerCache, $memcache, %courselogs, %accesshash, %domainrolehash,
     %userrolehash, $processmarker, $dumpcount, %coursedombuf,
@@ -92,44 +96,50 @@ use Time::HiRes qw( gettimeofday tv_inte
 use Cache::Memcached;
 use Digest::MD5;
 use Math::Random;
+use File::MMagic;
 use LONCAPA qw(:DEFAULT :match);
 use LONCAPA::Configuration;
+use LONCAPA::lonmetadata;
+use LONCAPA::Lond;
+
+use File::Copy;
 
 my $readit;
 my $max_connection_retries = 10;     # Or some such value.
 
-my $upload_photo_form = 0; #Variable to check  when user upload a photo 0=not 1=true
-
 require Exporter;
 
 our @ISA = qw (Exporter);
 our @EXPORT = qw(%env);
 
 
-# --------------------------------------------------------------------- Logging
+# ------------------------------------ Logging (parameters, docs, slots, roles)
 {
     my $logid;
-    sub instructor_log {
-	my ($hash_name,$storehash,$delflag,$uname,$udom,$cnum,$cdom)=@_;
-        if (($cnum eq '') || ($cdom eq '')) {
-            $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
-            $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+    sub write_log {
+	my ($context,$hash_name,$storehash,$delflag,$uname,$udom,$cnum,$cdom)=@_;
+        if ($context eq 'course') {
+            if (($cnum eq '') || ($cdom eq '')) {
+                $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+                $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+            }
         }
-	$logid++;
+	$logid ++;
         my $now = time();
 	my $id=$now.'00000'.$$.'00000'.$logid;
-	return &Apache::lonnet::put('nohist_'.$hash_name,
-				    { $id => {
-					'exe_uname' => $env{'user.name'},
-					'exe_udom'  => $env{'user.domain'},
-					'exe_time'  => $now,
-					'exe_ip'    => $ENV{'REMOTE_ADDR'},
-					'delflag'   => $delflag,
-					'logentry'  => $storehash,
-					'uname'     => $uname,
-					'udom'      => $udom,
-				    }
-				  },$cdom,$cnum);
+        my $logentry = { 
+                          $id => {
+                                   'exe_uname' => $env{'user.name'},
+                                   'exe_udom'  => $env{'user.domain'},
+                                   'exe_time'  => $now,
+                                   'exe_ip'    => $ENV{'REMOTE_ADDR'},
+                                   'delflag'   => $delflag,
+                                   'logentry'  => $storehash,
+                                   'uname'     => $uname,
+                                   'udom'      => $udom,
+                                  }
+                       };
+	return &put('nohist_'.$hash_name,$logentry,$cdom,$cnum);
     }
 }
 
@@ -196,6 +206,161 @@ sub get_server_timezone {
     }
 }
 
+sub get_server_distarch {
+    my ($lonhost,$ignore_cache) = @_;
+    if (defined($lonhost)) {
+        if (!defined(&hostname($lonhost))) {
+            return;
+        }
+        my $cachetime = 12*3600;
+        if (!$ignore_cache) {
+            my ($distarch,$cached)=&is_cached_new('serverdistarch',$lonhost);
+            if (defined($cached)) {
+                return $distarch;
+            }
+        }
+        my $rep = &reply('serverdistarch',$lonhost);
+        unless ($rep eq 'unknown_command' || $rep eq 'no_such_host' ||
+                $rep eq 'con_lost' || $rep eq 'rejected' || $rep eq 'refused' ||
+                $rep eq '') {
+            return &do_cache_new('serverdistarch',$lonhost,$rep,$cachetime);
+        }
+    }
+    return;
+}
+
+sub get_server_loncaparev {
+    my ($dom,$lonhost,$ignore_cache,$caller) = @_;
+    if (defined($lonhost)) {
+        if (!defined(&hostname($lonhost))) {
+            undef($lonhost);
+        }
+    }
+    if (!defined($lonhost)) {
+        if (defined(&domain($dom,'primary'))) {
+            $lonhost=&domain($dom,'primary');
+            if ($lonhost eq 'no_host') {
+                undef($lonhost);
+            }
+        }
+    }
+    if (defined($lonhost)) {
+        my $cachetime = 12*3600;
+        if (!$ignore_cache) {
+            my ($loncaparev,$cached)=&is_cached_new('serverloncaparev',$lonhost);
+            if (defined($cached)) {
+                return $loncaparev;
+            }
+        }
+        my ($answer,$loncaparev);
+        my @ids=&current_machine_ids();
+        if (grep(/^\Q$lonhost\E$/,@ids)) {
+            $answer = $perlvar{'lonVersion'};
+            if ($answer =~ /^[\'\"]?([\w.\-]+)[\'\"]?$/) {
+                $loncaparev = $1;
+            }
+        } else {
+            $answer = &reply('serverloncaparev',$lonhost);
+            if (($answer eq 'unknown_cmd') || ($answer eq 'con_lost')) {
+                if ($caller eq 'loncron') {
+                    my $ua=new LWP::UserAgent;
+                    $ua->timeout(4);
+                    my $protocol = $protocol{$lonhost};
+                    $protocol = 'http' if ($protocol ne 'https');
+                    my $url = $protocol.'://'.&hostname($lonhost).'/adm/about.html';
+                    my $request=new HTTP::Request('GET',$url);
+                    my $response=$ua->request($request);
+                    unless ($response->is_error()) {
+                        my $content = $response->content;
+                        if ($content =~ /<p>VERSION\:\s*([\w.\-]+)<\/p>/) {
+                            $loncaparev = $1;
+                        }
+                    }
+                } else {
+                    $loncaparev = $loncaparevs{$lonhost};
+                }
+            } elsif ($answer =~ /^[\'\"]?([\w.\-]+)[\'\"]?$/) {
+                $loncaparev = $1;
+            }
+        }
+        return &do_cache_new('serverloncaparev',$lonhost,$loncaparev,$cachetime);
+    }
+}
+
+sub get_server_homeID {
+    my ($hostname,$ignore_cache,$caller) = @_;
+    unless ($ignore_cache) {
+        my ($serverhomeID,$cached)=&is_cached_new('serverhomeID',$hostname);
+        if (defined($cached)) {
+            return $serverhomeID;
+        }
+    }
+    my $cachetime = 12*3600;
+    my $serverhomeID;
+    if ($caller eq 'loncron') { 
+        my @machine_ids = &machine_ids($hostname);
+        foreach my $id (@machine_ids) {
+            my $response = &reply('serverhomeID',$id);
+            unless (($response eq 'unknown_cmd') || ($response eq 'con_lost')) {
+                $serverhomeID = $response;
+                last;
+            }
+        }
+        if ($serverhomeID eq '') {
+            $serverhomeID = $machine_ids[-1];
+        }
+    } else {
+        $serverhomeID = $serverhomeIDs{$hostname};
+    }
+    return &do_cache_new('serverhomeID',$hostname,$serverhomeID,$cachetime);
+}
+
+sub get_remote_globals {
+    my ($lonhost,$whathash,$ignore_cache) = @_;
+    my ($result,%returnhash,%whatneeded);
+    if (ref($whathash) eq 'HASH') {
+        foreach my $what (sort(keys(%{$whathash}))) {
+            my $hashid = $lonhost.'-'.$what;
+            my ($response,$cached);
+            unless ($ignore_cache) {
+                ($response,$cached)=&is_cached_new('lonnetglobal',$hashid);
+            }
+            if (defined($cached)) {
+                $returnhash{$what} = $response;
+            } else {
+                $whatneeded{$what} = 1;
+            }
+        }
+        if (keys(%whatneeded) == 0) {
+            $result = 'ok';
+        } else {
+            my $requested = &freeze_escape(\%whatneeded);
+            my $rep=&reply('readlonnetglobal:'.$requested,$lonhost);
+            if (($rep=~/^(refused|rejected|error)/) || ($rep eq 'con_lost') ||
+                ($rep eq 'unknown_cmd')) {
+                $result = $rep;
+            } else {
+                $result = 'ok';
+                my @pairs=split(/\&/,$rep);
+                foreach my $item (@pairs) {
+                    my ($key,$value)=split(/=/,$item,2);
+                    my $what = &unescape($key);
+                    my $hashid = $lonhost.'-'.$what;
+                    $returnhash{$what}=&thaw_unescape($value);
+                    &do_cache_new('lonnetglobal',$hashid,$returnhash{$what},600);
+                }
+            }
+        }
+    }
+    return ($result,\%returnhash);
+}
+
+sub remote_devalidate_cache {
+    my ($lonhost,$name,$id) = @_;
+    my $response = &reply('devalidatecache:'.&escape($name).':'.&escape($id),$lonhost);
+    return $response;
+}
+
 # -------------------------------------------------- Non-critical communication
 sub subreply {
     my ($cmd,$server)=@_;
@@ -438,13 +603,21 @@ sub transfer_profile_to_env {
 
 # ---------------------------------------------------- Check for valid session 
 sub check_for_valid_session {
-    my ($r) = @_;
+    my ($r,$name) = @_;
     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
-    my $lonid=$cookies{'lonID'};
+    if ($name eq '') {
+        $name = 'lonID';
+    }
+    my $lonid=$cookies{$name};
     return undef if (!$lonid);
 
     my $handle=&LONCAPA::clean_handle($lonid->value);
-    my $lonidsdir=$r->dir_config('lonIDsDir');
+    my $lonidsdir;
+    if ($name eq 'lonDAV') {
+        $lonidsdir=$r->dir_config('lonDAVsessDir');
+    } else {
+        $lonidsdir=$r->dir_config('lonIDsDir');
+    }
     return undef if (!-e "$lonidsdir/$handle.id");
 
     my $opened = open(my $idf,'+<',"$lonidsdir/$handle.id");
@@ -526,11 +699,20 @@ sub appenv {
 # ----------------------------------------------------- Delete from Environment
 
 sub delenv {
-    my ($delthis,$regexp) = @_;
-    if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
-        &logthis("<font color=\"blue\">WARNING: ".
-                "Attempt to delete from environment ".$delthis);
-        return 'error';
+    my ($delthis,$regexp,$roles) = @_;
+    if (($delthis=~/^user\.role/) || ($delthis=~/^user\.priv/)) {
+        my $refused = 1;
+        if (ref($roles) eq 'ARRAY') {
+            my ($type,$role) = ($delthis =~ /^user\.(role|priv)\.([^.]+)\./);
+            if (grep(/^\Q$role\E$/,@{$roles})) {
+                $refused = 0;
+            }
+        }
+        if ($refused) {
+            &logthis("<font color=\"blue\">WARNING: ".
+                     "Attempt to delete from environment ".$delthis);
+            return 'error';
+        }
     }
     my $opened = open(my $env_file,'+<',$env{'user.environment'});
     if ($opened
@@ -639,51 +821,48 @@ sub userload {
     return $userloadpercent;
 }
 
-# ------------------------------------------ Fight off request when overloaded
-
-sub overloaderror {
-    my ($r,$checkserver)=@_;
-    unless ($checkserver) { $checkserver=$perlvar{'lonHostID'}; }
-    my $loadavg;
-    if ($checkserver eq $perlvar{'lonHostID'}) {
-       open(my $loadfile,'/proc/loadavg');
-       $loadavg=<$loadfile>;
-       $loadavg =~ s/\s.*//g;
-       $loadavg = 100*$loadavg/$perlvar{'lonLoadLim'};
-       close($loadfile);
-    } else {
-       $loadavg=&reply('load',$checkserver);
-    }
-    my $overload=$loadavg-100;
-    if ($overload>0) {
-	$r->err_headers_out->{'Retry-After'}=$overload;
-        $r->log_error('Overload of '.$overload.' on '.$checkserver);
-        return 413;
-    }    
-    return '';
-}
-
 # ------------------------------ Find server with least workload from spare.tab
 
 sub spareserver {
-    my ($loadpercent,$userloadpercent,$want_server_name) = @_;
+    my ($loadpercent,$userloadpercent,$want_server_name,$udom) = @_;
     my $spare_server;
     if ($userloadpercent !~ /\d/) { $userloadpercent=0; }
     my $lowest_load=($loadpercent > $userloadpercent) ? $loadpercent 
                                                      :  $userloadpercent;
-    
-    foreach my $try_server (@{ $spareid{'primary'} }) {
-	($spare_server, $lowest_load) =
-	    &compare_server_load($try_server, $spare_server, $lowest_load);
-    }
-
-    my $found_server = ($spare_server ne '' && $lowest_load < 100);
+    my ($uint_dom,$remotesessions);
+    if (($udom ne '') && (&domain($udom) ne '')) {
+        my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
+        $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
+        my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
+        $remotesessions = $udomdefaults{'remotesessions'};
+    }
+    my $spareshash = &this_host_spares($udom);
+    if (ref($spareshash) eq 'HASH') {
+        if (ref($spareshash->{'primary'}) eq 'ARRAY') {
+            foreach my $try_server (@{ $spareshash->{'primary'} }) {
+                if ($uint_dom) {
+                    next unless (&spare_can_host($udom,$uint_dom,$remotesessions,
+                                                 $try_server));
+                }
+	        ($spare_server, $lowest_load) =
+	            &compare_server_load($try_server, $spare_server, $lowest_load);
+            }
+        }
 
-    if (!$found_server) {
-	foreach my $try_server (@{ $spareid{'default'} }) {
-	    ($spare_server, $lowest_load) =
-		&compare_server_load($try_server, $spare_server, $lowest_load);
-	}
+        my $found_server = ($spare_server ne '' && $lowest_load < 100);
+
+        if (!$found_server) {
+            if (ref($spareshash->{'default'}) eq 'ARRAY') { 
+	        foreach my $try_server (@{ $spareshash->{'default'} }) {
+                    if ($uint_dom) {
+                        next unless (&spare_can_host($udom,$uint_dom,
+                                                     $remotesessions,$try_server));
+                    }
+	            ($spare_server, $lowest_load) =
+		        &compare_server_load($try_server, $spare_server, $lowest_load);
+                }
+	    }
+        }
     }
 
     if (!$want_server_name) {
@@ -691,7 +870,12 @@ sub spareserver {
         if ($protocol{$spare_server} eq 'https') {
             $protocol = $protocol{$spare_server};
         }
-	$spare_server = $protocol.'://'.&hostname($spare_server);
+        if (defined($spare_server)) {
+            my $hostname = &hostname($spare_server);
+            if (defined($hostname)) {
+	        $spare_server = $protocol.'://'.$hostname;
+            }
+        }
     }
     return $spare_server;
 }
@@ -703,7 +887,7 @@ sub compare_server_load {
     my $userloadans = &reply('userload',$try_server);
 
     if ($loadans !~ /\d/ && $userloadans !~ /\d/) {
-	next; #didn't get a number from the server
+	return ($spare_server, $lowest_load); #didn't get a number from the server
     }
 
     my $load;
@@ -729,9 +913,18 @@ sub compare_server_load {
 # --------------------------- ask offload servers if user already has a session
 sub find_existing_session {
     my ($udom,$uname) = @_;
-    foreach my $try_server (@{ $spareid{'primary'} },
-			    @{ $spareid{'default'} }) {
-	return $try_server if (&has_user_session($try_server, $udom, $uname));
+    my $spareshash = &this_host_spares($udom);
+    if (ref($spareshash) eq 'HASH') {
+        if (ref($spareshash->{'primary'}) eq 'ARRAY') {
+            foreach my $try_server (@{ $spareshash->{'primary'} }) {
+                return $try_server if (&has_user_session($try_server, $udom, $uname));
+            }
+        }
+        if (ref($spareshash->{'default'}) eq 'ARRAY') {
+            foreach my $try_server (@{ $spareshash->{'default'} }) {
+                return $try_server if (&has_user_session($try_server, $udom, $uname));
+            }
+        }
     }
     return;
 }
@@ -746,13 +939,53 @@ sub has_user_session {
     return 0;
 }
 
+# --------- determine least loaded server in a user's domain which allows login
+
+sub choose_server {
+    my ($udom,$checkloginvia) = @_;
+    my %domconfhash = &Apache::loncommon::get_domainconf($udom);
+    my %servers = &get_servers($udom);
+    my $lowest_load = 30000;
+    my ($login_host,$hostname,$portal_path,$isredirect);
+    foreach my $lonhost (keys(%servers)) {
+        my $loginvia;
+        if ($checkloginvia) {
+            $loginvia = $domconfhash{$udom.'.login.loginvia_'.$lonhost};
+            if ($loginvia) {
+                my ($server,$path) = split(/:/,$loginvia);
+                ($login_host, $lowest_load) =
+                    &compare_server_load($server, $login_host, $lowest_load);
+                if ($login_host eq $server) {
+                    $portal_path = $path;
+                    $isredirect = 1;
+                }
+            } else {
+                ($login_host, $lowest_load) =
+                    &compare_server_load($lonhost, $login_host, $lowest_load);
+                if ($login_host eq $lonhost) {
+                    $portal_path = '';
+                    $isredirect = ''; 
+                }
+            }
+        } else {
+            ($login_host, $lowest_load) =
+                &compare_server_load($lonhost, $login_host, $lowest_load);
+        }
+    }
+    if ($login_host ne '') {
+        $hostname = &hostname($login_host);
+    }
+    return ($login_host,$hostname,$portal_path,$isredirect);
+}
+
 # --------------------------------------------- Try to change a user's password
 
 sub changepass {
     my ($uname,$udom,$currentpass,$newpass,$server,$context)=@_;
     $currentpass = &escape($currentpass);
     $newpass     = &escape($newpass);
-    my $answer = reply("encrypt:passwd:$udom:$uname:$currentpass:$newpass:$context",
+    my $lonhost = $perlvar{'lonHostID'};
+    my $answer = reply("encrypt:passwd:$udom:$uname:$currentpass:$newpass:$context:$lonhost",
 		       $server);
     if (! $answer) {
 	&logthis("No reply on password change request to $server ".
@@ -777,6 +1010,9 @@ sub changepass {
     } elsif ($answer =~ "^refused") {
 	&logthis("$server refused to change $uname in $udom password because ".
 		 "it was sent an unencrypted request to change the password.");
+    } elsif ($answer =~ "invalid_client") {
+        &logthis("$server refused to change $uname in $udom password because ".
+                 "it was a reset by e-mail originating from an invalid server.");
     }
     return $answer;
 }
@@ -800,7 +1036,7 @@ sub queryauthenticate {
 # --------- Try to authenticate user from domain's lib servers (first this one)
 
 sub authenticate {
-    my ($uname,$upass,$udom,$checkdefauth)=@_;
+    my ($uname,$upass,$udom,$checkdefauth,$clientcancheckhost)=@_;
     $upass=&escape($upass);
     $uname= &LONCAPA::clean_username($uname);
     my $uhome=&homeserver($uname,$udom,1);
@@ -823,7 +1059,7 @@ sub authenticate {
 	    return 'no_host';
         }
     }
-    my $answer=reply("encrypt:auth:$udom:$uname:$upass:$checkdefauth",$uhome);
+    my $answer=reply("encrypt:auth:$udom:$uname:$upass:$checkdefauth:$clientcancheckhost",$uhome);
     if ($answer eq 'authorized') {
         if ($newhome) {
             &logthis("User $uname at $udom authorized by $uhome, but needs account");
@@ -841,6 +1077,415 @@ sub authenticate {
     return 'no_host';
 }
 
+sub can_host_session {
+    my ($udom,$lonhost,$remoterev,$remotesessions,$hostedsessions) = @_;
+    my $canhost = 1;
+    my $host_idn = &Apache::lonnet::internet_dom($lonhost);
+    if (ref($remotesessions) eq 'HASH') {
+        if (ref($remotesessions->{'excludedomain'}) eq 'ARRAY') {
+            if (grep(/^\Q$host_idn\E$/,@{$remotesessions->{'excludedomain'}})) {
+                $canhost = 0;
+            } else {
+                $canhost = 1;
+            }
+        }
+        if (ref($remotesessions->{'includedomain'}) eq 'ARRAY') {
+            if (grep(/^\Q$host_idn\E$/,@{$remotesessions->{'includedomain'}})) {
+                $canhost = 1;
+            } else {
+                $canhost = 0;
+            }
+        }
+        if ($canhost) {
+            if ($remotesessions->{'version'} ne '') {
+                my ($reqmajor,$reqminor) = ($remotesessions->{'version'} =~ /^(\d+)\.(\d+)$/);
+                if ($reqmajor ne '' && $reqminor ne '') {
+                    if ($remoterev =~ /^\'?(\d+)\.(\d+)/) {
+                        my $major = $1;
+                        my $minor = $2;
+                        if (($major < $reqmajor ) ||
+                            (($major == $reqmajor) && ($minor < $reqminor))) {
+                            $canhost = 0;
+                        }
+                    } else {
+                        $canhost = 0;
+                    }
+                }
+            }
+        }
+    }
+    if ($canhost) {
+        if (ref($hostedsessions) eq 'HASH') {
+            my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
+            my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
+            if (ref($hostedsessions->{'excludedomain'}) eq 'ARRAY') {
+                if (($uint_dom ne '') && 
+                    (grep(/^\Q$uint_dom\E$/,@{$hostedsessions->{'excludedomain'}}))) {
+                    $canhost = 0;
+                } else {
+                    $canhost = 1;
+                }
+            }
+            if (ref($hostedsessions->{'includedomain'}) eq 'ARRAY') {
+                if (($uint_dom ne '') && 
+                    (grep(/^\Q$uint_dom\E$/,@{$hostedsessions->{'includedomain'}}))) {
+                    $canhost = 1;
+                } else {
+                    $canhost = 0;
+                }
+            }
+        }
+    }
+    return $canhost;
+}
+
+sub spare_can_host {
+    my ($udom,$uint_dom,$remotesessions,$try_server)=@_;
+    my $canhost=1;
+    my @intdoms;
+    my $internet_names = &Apache::lonnet::get_internet_names($try_server);
+    if (ref($internet_names) eq 'ARRAY') {
+        @intdoms = @{$internet_names};
+    }
+    unless (grep(/^\Q$uint_dom\E$/,@intdoms)) {
+        my $serverhomeID = &Apache::lonnet::get_server_homeID($try_server);
+        my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
+        my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
+        my $remoterev = &Apache::lonnet::get_server_loncaparev(undef,$try_server);
+        $canhost = &can_host_session($udom,$try_server,$remoterev,
+                                     $remotesessions,
+                                     $defdomdefaults{'hostedsessions'});
+    }
+    return $canhost;
+}
+
+sub this_host_spares {
+    my ($dom) = @_;
+    my ($dom_in_use,$lonhost_in_use,$result);
+    my @hosts = &current_machine_ids();
+    foreach my $lonhost (@hosts) {
+        if (&host_domain($lonhost) eq $dom) {
+            $dom_in_use = $dom;
+            $lonhost_in_use = $lonhost;
+            last;
+        }
+    }
+    if ($dom_in_use ne '') {
+        $result = &spares_for_offload($dom_in_use,$lonhost_in_use);
+    }
+    if (ref($result) ne 'HASH') {
+        $lonhost_in_use = $perlvar{'lonHostID'};
+        $dom_in_use = &host_domain($lonhost_in_use);
+        $result = &spares_for_offload($dom_in_use,$lonhost_in_use);
+        if (ref($result) ne 'HASH') {
+            $result = \%spareid;
+        }
+    }
+    return $result;
+}
+
+sub spares_for_offload  {
+    my ($dom_in_use,$lonhost_in_use) = @_;
+    my ($result,$cached)=&is_cached_new('spares',$dom_in_use);
+    if (defined($cached)) {
+        return $result;
+    } else {
+        my $cachetime = 60*60*24;
+        my %domconfig =
+            &Apache::lonnet::get_dom('configuration',['usersessions'],$dom_in_use);
+        if (ref($domconfig{'usersessions'}) eq 'HASH') {
+            if (ref($domconfig{'usersessions'}{'spares'}) eq 'HASH') {
+                if (ref($domconfig{'usersessions'}{'spares'}{$lonhost_in_use}) eq 'HASH') {
+                    return &do_cache_new('spares',$dom_in_use,$domconfig{'usersessions'}{'spares'}{$lonhost_in_use},$cachetime);
+                }
+            }
+        }
+    }
+    return;
+}
+
+sub get_lonbalancer_config {
+    my ($servers) = @_;
+    my ($currbalancer,$currtargets);
+    if (ref($servers) eq 'HASH') {
+        foreach my $server (keys(%{$servers})) {
+            my %what = (
+                         spareid => 1,
+                         perlvar => 1,
+                       );
+            my ($result,$returnhash) = &get_remote_globals($server,\%what);
+            if ($result eq 'ok') {
+                if (ref($returnhash) eq 'HASH') {
+                    if (ref($returnhash->{'perlvar'}) eq 'HASH') {
+                        if ($returnhash->{'perlvar'}->{'lonBalancer'} eq 'yes') {
+                            $currbalancer = $server;
+                            $currtargets = {};
+                            if (ref($returnhash->{'spareid'}) eq 'HASH') {
+                                if (ref($returnhash->{'spareid'}->{'primary'}) eq 'ARRAY') {
+                                    $currtargets->{'primary'} = $returnhash->{'spareid'}->{'primary'};
+                                }
+                                if (ref($returnhash->{'spareid'}->{'default'}) eq 'ARRAY') {
+                                    $currtargets->{'default'} = $returnhash->{'spareid'}->{'default'};
+                                }
+                            }
+                            last;
+                        }
+                    }
+                }
+            }
+        }
+    }
+    return ($currbalancer,$currtargets);
+}
+
+sub check_loadbalancing {
+    my ($uname,$udom) = @_;
+    my ($is_balancer,$currtargets,$currrules,$dom_in_use,$homeintdom,
+        $rule_in_effect,$offloadto,$otherserver);
+    my $lonhost = $perlvar{'lonHostID'};
+    my @hosts = &current_machine_ids();
+    my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
+    my $uintdom = &Apache::lonnet::internet_dom($uprimary_id);
+    my $intdom = &Apache::lonnet::internet_dom($lonhost);
+    my $serverhomedom = &host_domain($lonhost);
+
+    my $cachetime = 60*60*24;
+
+    if (($uintdom ne '') && ($uintdom eq $intdom)) {
+        $dom_in_use = $udom;
+        $homeintdom = 1;
+    } else {
+        $dom_in_use = $serverhomedom;
+    }
+    my ($result,$cached)=&is_cached_new('loadbalancing',$dom_in_use);
+    unless (defined($cached)) {
+        my %domconfig =
+            &Apache::lonnet::get_dom('configuration',['loadbalancing'],$dom_in_use);
+        if (ref($domconfig{'loadbalancing'}) eq 'HASH') {
+            $result = &do_cache_new('loadbalancing',$dom_in_use,$domconfig{'loadbalancing'},$cachetime);
+        }
+    }
+    if (ref($result) eq 'HASH') {
+        ($is_balancer,$currtargets,$currrules) = 
+            &check_balancer_result($result,@hosts);
+        if ($is_balancer) {
+            if (ref($currrules) eq 'HASH') {
+                if ($homeintdom) {
+                    if ($uname ne '') {
+                        if (($currrules->{'_LC_adv'} ne '') || ($currrules->{'_LC_author'} ne '')) {
+                            my ($is_adv,$is_author) = &is_advanced_user($udom,$uname);
+                            if (($currrules->{'_LC_author'} ne '') && ($is_author)) {
+                                $rule_in_effect = $currrules->{'_LC_author'};
+                            } elsif (($currrules->{'_LC_adv'} ne '') && ($is_adv)) {
+                                $rule_in_effect = $currrules->{'_LC_adv'}
+                            }
+                        }
+                        if ($rule_in_effect eq '') {
+                            my %userenv = &userenvironment($udom,$uname,'inststatus');
+                            if ($userenv{'inststatus'} ne '') {
+                                my @statuses = map { &unescape($_); } split(/:/,$userenv{'inststatus'});
+                                my ($othertitle,$usertypes,$types) =
+                                    &Apache::loncommon::sorted_inst_types($udom);
+                                if (ref($types) eq 'ARRAY') {
+                                    foreach my $type (@{$types}) {
+                                        if (grep(/^\Q$type\E$/,@statuses)) {
+                                            if (exists($currrules->{$type})) {
+                                                $rule_in_effect = $currrules->{$type};
+                                            }
+                                        }
+                                    }
+                                }
+                            } else {
+                                if (exists($currrules->{'default'})) {
+                                    $rule_in_effect = $currrules->{'default'};
+                                }
+                            }
+                        }
+                    } else {
+                        if (exists($currrules->{'default'})) {
+                            $rule_in_effect = $currrules->{'default'};
+                        }
+                    }
+                } else {
+                    if ($currrules->{'_LC_external'} ne '') {
+                        $rule_in_effect = $currrules->{'_LC_external'};
+                    }
+                }
+                $offloadto = &get_loadbalancer_targets($rule_in_effect,$currtargets,
+                                                       $uname,$udom);
+            }
+        }
+    } elsif (($homeintdom) && ($udom ne $serverhomedom)) {
+        my ($result,$cached)=&is_cached_new('loadbalancing',$serverhomedom);
+        unless (defined($cached)) {
+            my %domconfig =
+                &Apache::lonnet::get_dom('configuration',['loadbalancing'],$serverhomedom);
+            if (ref($domconfig{'loadbalancing'}) eq 'HASH') {
+                $result = &do_cache_new('loadbalancing',$dom_in_use,$domconfig{'loadbalancing'},$cachetime);
+            }
+        }
+        if (ref($result) eq 'HASH') {
+            ($is_balancer,$currtargets,$currrules) = 
+                &check_balancer_result($result,@hosts);
+            if ($is_balancer) {
+                if (ref($currrules) eq 'HASH') {
+                    if ($currrules->{'_LC_internetdom'} ne '') {
+                        $rule_in_effect = $currrules->{'_LC_internetdom'};
+                    }
+                }
+                $offloadto = &get_loadbalancer_targets($rule_in_effect,$currtargets,
+                                                       $uname,$udom);
+            }
+        } else {
+            if ($perlvar{'lonBalancer'} eq 'yes') {
+                $is_balancer = 1;
+                $offloadto = &this_host_spares($dom_in_use);
+            }
+        }
+    } else {
+        if ($perlvar{'lonBalancer'} eq 'yes') {
+            $is_balancer = 1;
+            $offloadto = &this_host_spares($dom_in_use);
+        }
+    }
+    if ($is_balancer) {
+        my $lowest_load = 30000;
+        if (ref($offloadto) eq 'HASH') {
+            if (ref($offloadto->{'primary'}) eq 'ARRAY') {
+                foreach my $try_server (@{$offloadto->{'primary'}}) {
+                    ($otherserver,$lowest_load) =
+                        &compare_server_load($try_server,$otherserver,$lowest_load);
+                }
+            }
+            my $found_server = ($otherserver ne '' && $lowest_load < 100);
+
+            if (!$found_server) {
+                if (ref($offloadto->{'default'}) eq 'ARRAY') {
+                    foreach my $try_server (@{$offloadto->{'default'}}) {
+                        ($otherserver,$lowest_load) =
+                            &compare_server_load($try_server,$otherserver,$lowest_load);
+                    }
+                }
+            }
+        } elsif (ref($offloadto) eq 'ARRAY') {
+            if (@{$offloadto} == 1) {
+                $otherserver = $offloadto->[0];
+            } elsif (@{$offloadto} > 1) {
+                foreach my $try_server (@{$offloadto}) {
+                    ($otherserver,$lowest_load) =
+                        &compare_server_load($try_server,$otherserver,$lowest_load);
+                }
+            }
+        }
+        if (($otherserver ne '') && (grep(/^\Q$otherserver\E$/,@hosts))) {
+            $is_balancer = 0;
+            if ($uname ne '' && $udom ne '') {
+                if (($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
+                    
+                    &appenv({'user.loadbalexempt'     => $lonhost,  
+                             'user.loadbalcheck.time' => time});
+                }
+            }
+        }
+    }
+    return ($is_balancer,$otherserver);
+}
+
+sub check_balancer_result {
+    my ($result,@hosts) = @_;
+    my ($is_balancer,$currtargets,$currrules);
+    if (ref($result) eq 'HASH') {
+        if ($result->{'lonhost'} ne '') {
+            my $currbalancer = $result->{'lonhost'};
+            if (grep(/^\Q$currbalancer\E$/,@hosts)) {
+                $is_balancer = 1;
+                $currtargets = $result->{'targets'};
+                $currrules = $result->{'rules'};
+            }
+        } else {
+            foreach my $key (keys(%{$result})) {
+                if (($key ne '') && (grep(/^\Q$key\E$/,@hosts)) &&
+                    (ref($result->{$key}) eq 'HASH')) {
+                    $is_balancer = 1;
+                    $currrules = $result->{$key}{'rules'};
+                    $currtargets = $result->{$key}{'targets'};
+                    last;
+                }
+            }
+        }
+    }
+    return ($is_balancer,$currtargets,$currrules);
+}
+
+sub get_loadbalancer_targets {
+    my ($rule_in_effect,$currtargets,$uname,$udom) = @_;
+    my $offloadto;
+    if ($rule_in_effect eq 'none') {
+        return [$perlvar{'lonHostID'}];
+    } elsif ($rule_in_effect eq '') {
+        $offloadto = $currtargets;
+    } else {
+        if ($rule_in_effect eq 'homeserver') {
+            my $homeserver = &homeserver($uname,$udom);
+            if ($homeserver ne 'no_host') {
+                $offloadto = [$homeserver];
+            }
+        } elsif ($rule_in_effect eq 'externalbalancer') {
+            my %domconfig =
+                &Apache::lonnet::get_dom('configuration',['loadbalancing'],$udom);
+            if (ref($domconfig{'loadbalancing'}) eq 'HASH') {
+                if ($domconfig{'loadbalancing'}{'lonhost'} ne '') {
+                    if (&hostname($domconfig{'loadbalancing'}{'lonhost'}) ne '') {
+                        $offloadto = [$domconfig{'loadbalancing'}{'lonhost'}];
+                    }
+                }
+            } else {
+                my %servers = &internet_dom_servers($udom);
+                my ($remotebalancer,$remotetargets) = &get_lonbalancer_config(\%servers);
+                if (&hostname($remotebalancer) ne '') {
+                    $offloadto = [$remotebalancer];
+                }
+            }
+        } elsif (&hostname($rule_in_effect) ne '') {
+            $offloadto = [$rule_in_effect];
+        }
+    }
+    return $offloadto;
+}
+
+sub internet_dom_servers {
+    my ($dom) = @_;
+    my (%uniqservers,%servers);
+    my $primaryserver = &hostname(&domain($dom,'primary'));
+    my @machinedoms = &machine_domains($primaryserver);
+    foreach my $mdom (@machinedoms) {
+        my %currservers = %servers;
+        my %server = &get_servers($mdom);
+        %servers = (%currservers,%server);
+    }
+    my %by_hostname;
+    foreach my $id (keys(%servers)) {
+        push(@{$by_hostname{$servers{$id}}},$id);
+    }
+    foreach my $hostname (sort(keys(%by_hostname))) {
+        if (@{$by_hostname{$hostname}} > 1) {
+            my $match = 0;
+            foreach my $id (@{$by_hostname{$hostname}}) {
+                if (&host_domain($id) eq $dom) {
+                    $uniqservers{$id} = $hostname;
+                    $match = 1;
+                }
+            }
+            unless ($match) {
+                $uniqservers{$by_hostname{$hostname}[0]} = $hostname;
+            }
+        } else {
+            $uniqservers{$by_hostname{$hostname}[0]} = $hostname;
+        }
+    }
+    return %uniqservers;
+}
+
 # ---------------------- Find the homebase for a user from domain's lib servers
 
 my %homecache;
@@ -926,7 +1571,18 @@ sub idput {
     }
 }
 
-# ------------------------------------------- get items from domain db files   
+# ------------------------------dump from db file owned by domainconfig user
+sub dump_dom {
+    my ($namespace, $udom, $regexp) = @_;
+
+    $udom ||= $env{'user.domain'};
+
+    return () unless $udom;
+
+    return &dump($namespace, $udom, &get_domainconfiguser($udom), $regexp);
+}
+
+# ------------------------------------------ get items from domain db files   
 
 sub get_dom {
     my ($namespace,$storearr,$udom,$uhome)=@_;
@@ -1000,6 +1656,40 @@ sub put_dom {
     }
 }
 
+# --------------------- newput for items in db file owned by domainconfig user
+sub newput_dom {
+    my ($namespace,$storehash,$udom) = @_;
+    my $result;
+    if (!$udom) {
+        $udom=$env{'user.domain'};
+    }
+    if ($udom) {
+        my $uname = &get_domainconfiguser($udom);
+        $result = &newput($namespace,$storehash,$udom,$uname);
+    }
+    return $result;
+}
+
+# --------------------- delete for items in db file owned by domainconfig user
+sub del_dom {
+    my ($namespace,$storearr,$udom)=@_;
+    if (ref($storearr) eq 'ARRAY') {
+        if (!$udom) {
+            $udom=$env{'user.domain'};
+        }
+        if ($udom) {
+            my $uname = &get_domainconfiguser($udom); 
+            return &del($namespace,$storearr,$udom,$uname);
+        }
+    }
+}
+
+# ----------------------------------construct domainconfig user for a domain 
+sub get_domainconfiguser {
+    my ($udom) = @_;
+    return $udom.'-domainconfig';
+}
+
 sub retrieve_inst_usertypes {
     my ($udom) = @_;
     my (%returnhash,@order);
@@ -1268,13 +1958,16 @@ sub get_domain_defaults {
     my %domdefaults;
     my %domconfig =
          &Apache::lonnet::get_dom('configuration',['defaults','quotas',
-                                  'requestcourses','inststatus'],$domain);
+                                  'requestcourses','inststatus',
+                                  'coursedefaults','usersessions',
+                                  'requestauthor'],$domain);
     if (ref($domconfig{'defaults'}) eq 'HASH') {
         $domdefaults{'lang_def'} = $domconfig{'defaults'}{'lang_def'}; 
         $domdefaults{'auth_def'} = $domconfig{'defaults'}{'auth_def'};
         $domdefaults{'auth_arg_def'} = $domconfig{'defaults'}{'auth_arg_def'};
         $domdefaults{'timezone_def'} = $domconfig{'defaults'}{'timezone_def'};
         $domdefaults{'datelocale_def'} = $domconfig{'defaults'}{'datelocale_def'};
+        $domdefaults{'portal_def'} = $domconfig{'defaults'}{'portal_def'};
     } else {
         $domdefaults{'lang_def'} = &domain($domain,'lang_def');
         $domdefaults{'auth_def'} = &domain($domain,'auth_def');
@@ -1286,7 +1979,7 @@ sub get_domain_defaults {
         } else {
             $domdefaults{'defaultquota'} = $domconfig{'quotas'};
         } 
-        my @usertools = ('aboutme','blog','portfolio');
+        my @usertools = ('aboutme','blog','webdav','portfolio');
         foreach my $item (@usertools) {
             if (ref($domconfig{'quotas'}{$item}) eq 'HASH') {
                 $domdefaults{$item} = $domconfig{'quotas'}{$item};
@@ -1294,15 +1987,31 @@ sub get_domain_defaults {
         }
     }
     if (ref($domconfig{'requestcourses'}) eq 'HASH') {
-        foreach my $item ('official','unofficial') {
+        foreach my $item ('official','unofficial','community') {
             $domdefaults{$item} = $domconfig{'requestcourses'}{$item};
         }
     }
+    if (ref($domconfig{'requestauthor'}) eq 'HASH') {
+        $domdefaults{'requestauthor'} = $domconfig{'requestauthor'};
+    }
     if (ref($domconfig{'inststatus'}) eq 'HASH') {
         foreach my $item ('inststatustypes','inststatusorder') {
             $domdefaults{$item} = $domconfig{'inststatus'}{$item};
         }
     }
+    if (ref($domconfig{'coursedefaults'}) eq 'HASH') {
+        foreach my $item ('canuse_pdfforms') {
+            $domdefaults{$item} = $domconfig{'coursedefaults'}{$item};
+        }
+    }
+    if (ref($domconfig{'usersessions'}) eq 'HASH') {
+        if (ref($domconfig{'usersessions'}{'remote'}) eq 'HASH') {
+            $domdefaults{'remotesessions'} = $domconfig{'usersessions'}{'remote'};
+        }
+        if (ref($domconfig{'usersessions'}{'hosted'}) eq 'HASH') {
+            $domdefaults{'hostedsessions'} = $domconfig{'usersessions'}{'hosted'};
+        }
+    }
     &Apache::lonnet::do_cache_new('domdefaults',$domain,\%domdefaults,
                                   $cachetime);
     return %domdefaults;
@@ -1554,7 +2263,7 @@ sub is_cached_new {
     my ($name,$id,$debug) = @_;
     $id=&make_key($name,$id);
     if (exists($remembered{$id})) {
-	if ($debug) { &Apache::lonnet::logthis("Earyl return $id of $remembered{$id} "); }
+	if ($debug) { &Apache::lonnet::logthis("Early return $id of $remembered{$id} "); }
 	$accessed{$id}=[&gettimeofday()];
 	$hits++;
 	return ($remembered{$id},1);
@@ -1633,12 +2342,17 @@ sub userenvironment {
     }
     $items=~s/\&$//;
     my %returnhash=();
-    my @answer=split(/\&/,
-                &reply('get:'.$udom.':'.$unam.':environment:'.$items,
-                      &homeserver($unam,$udom)));
-    my $i;
-    for ($i=0;$i<=$#what;$i++) {
-	$returnhash{$what[$i]}=&unescape($answer[$i]);
+    my $uhome = &homeserver($unam,$udom);
+    unless ($uhome eq 'no_host') {
+        my @answer=split(/\&/, 
+            &reply('get:'.$udom.':'.$unam.':environment:'.$items,$uhome));
+        if ($#answer==0 && $answer[0] =~ /^(con_lost|error:|no_such_host)/i) {
+            return %returnhash;
+        }
+        my $i;
+        for ($i=0;$i<=$#what;$i++) {
+	    $returnhash{$what[$i]}=&unescape($answer[$i]);
+        }
     }
     return %returnhash;
 }
@@ -1709,26 +2423,35 @@ sub chatsend {
 
 sub getversion {
     my $fname=&clutter(shift);
-    unless ($fname=~/^\/res\//) { return -1; }
+    unless ($fname=~m{^(/adm/wrapper|)/res/}) { return -1; }
     return &currentversion(&filelocation('',$fname));
 }
 
 sub currentversion {
     my $fname=shift;
-    my ($result,$cached)=&is_cached_new('resversion',$fname);
-    if (defined($cached)) { return $result; }
     my $author=$fname;
     $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
     my ($udom,$uname)=split(/\//,$author);
-    my $home=homeserver($uname,$udom);
+    my $home=&homeserver($uname,$udom);
     if ($home eq 'no_host') { 
         return -1; 
     }
-    my $answer=reply("currentversion:$fname",$home);
+    my $answer=&reply("currentversion:$fname",$home);
     if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
 	return -1;
     }
-    return &do_cache_new('resversion',$fname,$answer,600);
+    return $answer;
+}
+
+#
+# Return special version number of resource if set by override, empty otherwise
+#
+sub usedversion {
+    my $fname=shift;
+    unless ($fname) { $fname=$env{'request.uri'}; }
+    my ($urlversion)=($fname=~/\.(\d+)\.\w+$/);
+    if ($urlversion) { return $urlversion; }
+    return '';
 }
 
 # ----------------------------- Subscribe to a resource, return URL if possible
@@ -1756,10 +2479,11 @@ sub subscribe {
 sub repcopy {
     my $filename=shift;
     $filename=~s/\/+/\//g;
-    if ($filename=~m|^/home/httpd/html/adm/|) { return 'ok'; }
-    if ($filename=~m|^/home/httpd/html/lonUsers/|) { return 'ok'; }
-    if ($filename=~m|^/home/httpd/html/userfiles/| or
-	$filename=~m -^/*(uploaded|editupload)/-) { 
+    my $londocroot = $perlvar{'lonDocRoot'};
+    if ($filename=~m{^\Q$londocroot/adm/\E}) { return 'ok'; }
+    if ($filename=~m{^\Q/home/httpd/lonUsers/\E}) { return 'ok'; }
+    if ($filename=~m{^\Q$londocroot/userfiles/\E} or
+	$filename=~m{^/*(uploaded|editupload)/}) {
 	return &repcopy_userfile($filename);
     }
     $filename=~s/[\n\r]//g;
@@ -1786,7 +2510,7 @@ sub repcopy {
         unless ($home eq $perlvar{'lonHostID'}) {
            my @parts=split(/\//,$filename);
            my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
-           if ($path ne "$perlvar{'lonDocRoot'}/res") {
+           if ($path ne "$londocroot/res") {
                &logthis("Malconfiguration for replication: $filename");
 	       return 'bad_request';
            }
@@ -1834,6 +2558,8 @@ sub ssi_body {
     if ($filelink=~/^https?\:/) {
        ($output,$response)=&externalssi($filelink);
     } else {
+       $filelink .= $filelink=~/\?/ ? '&' : '?';
+       $filelink .= 'inhibitmenu=yes';
        ($output,$response)=&ssi($filelink,%form);
     }
     $output=~s|//(\s*<!--)? BEGIN LON-CAPA Internal.+?// END LON-CAPA Internal\s*(-->)?\s||gs;
@@ -1877,18 +2603,20 @@ sub ssi {
     &Apache::lonenc::check_encrypt(\$fn);
     if (%form) {
       $request=new HTTP::Request('POST',&absolute_url().$fn);
-      $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys %form));
+      $request->content(join('&',map { &escape($_).'='.&escape($form{$_}) } keys(%form)));
     } else {
       $request=new HTTP::Request('GET',&absolute_url().$fn);
     }
 
     $request->header(Cookie => $ENV{'HTTP_COOKIE'});
-    my $response=$ua->request($request);
+    my $response= $ua->request($request);
+    my $content = $response->content;
+
 
     if (wantarray) {
-	return ($response->content, $response);
+	return ($content, $response);
     } else {
-	return $response->content;
+	return $content;
     }
 }
 
@@ -1917,11 +2645,248 @@ sub allowuploaded {
     &Apache::lonnet::appenv(\%httpref);
 }
 
+#
+# Determine if the current user should be able to edit a particular resource,
+# when viewing in course context.
+# (a) When viewing resource used to determine if "Edit" item is included in 
+#     Functions.
+# (b) When displaying folder contents in course editor, used to determine if
+#     "Edit" link will be displayed alongside resource.
+#
+#  input: six args -- filename (decluttered), course number, course domain,
+#                   url, symb (if registered) and group (if this is a group
+#                   item -- e.g., bulletin board, group page etc.).
+#  output: array of five scalars -- 
+#          $cfile -- url for file editing if editable on current server
+#          $home -- homeserver of resource (i.e., for author if published,
+#                                           or course if uploaded.).
+#          $switchserver --  1 if server switch will be needed.
+#          $forceedit -- 1 if icon/link should be to go to edit mode 
+#          $forceview -- 1 if icon/link should be to go to view mode
+#
+
+sub can_edit_resource {
+    my ($file,$cnum,$cdom,$resurl,$symb,$group) = @_;
+    my ($cfile,$home,$switchserver,$forceedit,$forceview,$uploaded,$incourse);
+#
+# For aboutme pages user can only edit his/her own.
+#
+    if ($resurl =~ m{^/?adm/($match_domain)/($match_username)/aboutme$}) {
+        my ($sdom,$sname) = ($1,$2);
+        if (($sdom eq $env{'user.domain'}) && ($sname eq $env{'user.name'})) {
+            $home = $env{'user.home'};
+            $cfile = $resurl;
+            if ($env{'form.forceedit'}) {
+                $forceview = 1;
+            } else {
+                $forceedit = 1;
+            }
+            return ($cfile,$home,$switchserver,$forceedit,$forceview);
+        } else {
+            return;
+        }
+    }
+
+    if ($env{'request.course.id'}) {
+        my $crsedit = &Apache::lonnet::allowed('mdc',$env{'request.course.id'});
+        if ($group ne '') {
+# if this is a group homepage or group bulletin board, check group privs
+            my $allowed = 0;
+            if ($resurl =~ m{^/?adm/$cdom/$cnum/$group/smppg$}) {
+                if ((&allowed('mdg',$env{'request.course.id'}.
+                              ($env{'request.course.sec'}?'/'.$env{'request.course.sec'}:''))) ||
+                        (&allowed('mgh',$env{'request.course.id'}.'/'.$group)) || $crsedit) {
+                    $allowed = 1;
+                }
+            } elsif ($resurl =~ m{^/?adm/$cdom/$cnum/\d+/bulletinboard$}) {
+                if ((&allowed('mdg',$env{'request.course.id'}.($env{'request.course.sec'}?'/'.$env{'request.course.sec'}:''))) ||
+                        (&allowed('cgb',$env{'request.course.id'}.'/'.$group)) || $crsedit) {
+                    $allowed = 1;
+                }
+            }
+            if ($allowed) {
+                $home=&homeserver($cnum,$cdom);
+                if ($env{'form.forceedit'}) {
+                    $forceview = 1;
+                } else {
+                    $forceedit = 1;
+                }
+                $cfile = $resurl;
+            } else {
+                return;
+            }
+        } else {
+#
+# No edit allowed where CC has switched to student role.
+#
+            unless ($crsedit) {
+                return;
+            }
+        }
+    }
+
+    if ($file ne '') {
+        if (($cnum =~ /$match_courseid/) && ($cdom =~ /$match_domain/)) {
+            if (&is_course_upload($file,$cnum,$cdom)) {
+                $uploaded = 1;
+                $incourse = 1;
+                if ($file =~/\.(htm|html|css|js|txt)$/) {
+                    $cfile = &hreflocation('',$file);
+                    if ($env{'form.forceedit'}) {
+                        $forceview = 1;
+                    } else {
+                        $forceedit = 1;
+                    }
+                }
+            } elsif ($resurl =~ m{^/public/$cdom/$cnum/syllabus}) {
+                $incourse = 1;
+                if ($env{'form.forceedit'}) {
+                    $forceview = 1;
+                } else {
+                    $forceedit = 1;
+                }
+                $cfile = $resurl;
+            } elsif (($resurl ne '') && (&is_on_map($resurl))) { 
+                if ($resurl =~ m{^/adm/$match_domain/$match_username/\d+/smppg|bulletinboard$}) {
+                    $incourse = 1;
+                    if ($env{'form.forceedit'}) {
+                        $forceview = 1;
+                    } else {
+                        $forceedit = 1;
+                    }
+                    $cfile = $resurl;
+                } elsif ($resurl eq '/res/lib/templates/simpleproblem.problem') {
+                    $incourse = 1;
+                    $cfile = $resurl.'/smpedit';
+                } elsif ($resurl =~ m{^/adm/wrapper/ext/}) {
+                    $incourse = 1;
+                    if ($env{'form.forceedit'}) {
+                        $forceview = 1;
+                    } else {
+                        $forceedit = 1;
+                    }
+                    $cfile = $resurl;
+                }
+            } elsif ($resurl eq '/res/lib/templates/simpleproblem.problem/smpedit') {
+                my $template = '/res/lib/templates/simpleproblem.problem';
+                if (&is_on_map($template)) { 
+                    $incourse = 1;
+                    $forceview = 1;
+                    $cfile = $template;
+                }
+            } elsif (($resurl =~ m{^/adm/wrapper/ext/}) && ($env{'form.folderpath'} =~ /^supplemental/)) {
+                    $incourse = 1;
+                    if ($env{'form.forceedit'}) {
+                        $forceview = 1;
+                    } else {
+                        $forceedit = 1;
+                    }
+                    $cfile = $resurl;
+            } elsif (($resurl eq '/adm/extresedit') && ($symb || $env{'form.folderpath'})) {
+                $incourse = 1;
+                $forceview = 1;
+                if ($symb) {
+                    my ($map,$id,$res)=&decode_symb($symb);
+                    $env{'request.symb'} = $symb;
+                    $cfile = &clutter($res);
+                } else {
+                    $cfile = $env{'form.suppurl'};
+                    $cfile =~ s{^http://}{};
+                    $cfile = '/adm/wrapper/ext/'.$cfile;
+                }
+            }
+        }
+        if ($uploaded || $incourse) {
+            $home=&homeserver($cnum,$cdom);
+        } else {
+            $file=~s{^(priv/$match_domain/$match_username)}{/$1};
+            $file=~s{^($match_domain/$match_username)}{/priv/$1};
+            # Check that the user has permission to edit this resource
+            my $setpriv = 1;
+            my ($cfuname,$cfudom)=&constructaccess($file,$setpriv);
+            if (defined($cfudom)) {
+                $home=&homeserver($cfuname,$cfudom);
+                $cfile=$file;
+            }
+        }
+        if (($cfile ne '') && (!$incourse || $uploaded) && 
+            (($home ne '') && ($home ne 'no_host'))) {
+            my @ids=&current_machine_ids();
+            unless (grep(/^\Q$home\E$/,@ids)) {
+                $switchserver=1;
+            }
+        }
+    }
+    return ($cfile,$home,$switchserver,$forceedit,$forceview);
+}
+
+sub is_course_upload {
+    my ($file,$cnum,$cdom) = @_;
+    my $uploadpath = &LONCAPA::propath($cdom,$cnum);
+    $uploadpath =~ s{^\/}{};
+    if (($file =~ m{^\Q$uploadpath\E/userfiles/(docs|supplemental)/}) ||
+        ($file =~ m{^userfiles/\Q$cdom\E/\Q$cnum\E/(docs|supplemental)/})) {
+        return 1;
+    }
+    return;
+}
+
+sub in_course {
+    my ($udom,$uname,$cdom,$cnum,$type,$hideprivileged) = @_;
+    if ($hideprivileged) {
+        my $skipuser;
+        if (&privileged($uname,$udom)) {
+            $skipuser = 1;
+            my %coursehash = &coursedescription($cdom.'_'.$cnum);
+            if ($coursehash{'nothideprivileged'}) {
+                foreach my $item (split(/\s*\,\s*/,$coursehash{'nothideprivileged'})) {
+                    my $user;
+                    if ($item =~ /:/) {
+                        $user = $item;
+                    } else {
+                        $user = join(':',split(/[\@]/,$item));
+                    }
+                    if ($user eq $uname.':'.$udom) {
+                        undef($skipuser);
+                        last;
+                    }
+                }
+            }
+            if ($skipuser) {
+                return 0;
+            }
+        }
+    }
+    $type ||= 'any';
+    if (!defined($cdom) || !defined($cnum)) {
+        my $cid  = $env{'request.course.id'};
+        $cdom = $env{'course.'.$cid.'.domain'};
+        $cnum = $env{'course.'.$cid.'.num'};
+    }
+    my $typesref;
+    if (($type eq 'any') || ($type eq 'all')) {
+        $typesref = ['active','previous','future'];
+    } elsif ($type eq 'previous' || $type eq 'future') {
+        $typesref = [$type];
+    }
+    my %roles = &get_my_roles($uname,$udom,'userroles',
+                              $typesref,undef,[$cdom]);
+    my ($tmp) = keys(%roles);
+    return 0 if ($tmp =~ /^(con_lost|error|no_such_host)/i);
+    my @course_roles = grep(/^\Q$cnum\E:\Q$cdom\E:/, keys(%roles));
+    if (@course_roles > 0) {
+        return 1;
+    }
+    return 0;
+}
+
 # --------- File operations in /home/httpd/html/userfiles/$domain/1/2/3/$course
 # input: action, courseID, current domain, intended
 #        path to file, source of file, instruction to parse file for objects,
 #        ref to hash for embedded objects,
 #        ref to hash for codebase of java objects.
+#        reference to scalar to accommodate mime type determined
+#          from File::MMagic if $parser = parse.
 #
 # output: url to file (if action was uploaddoc), 
 #         ok if successful, or diagnostic message otherwise (if action was propagate or copy)
@@ -1948,7 +2913,8 @@ sub allowuploaded {
 #
 
 sub process_coursefile {
-    my ($action,$docuname,$docudom,$file,$source,$parser,$allfiles,$codebase)=@_;
+    my ($action,$docuname,$docudom,$file,$source,$parser,$allfiles,$codebase,
+        $mimetype)=@_;
     my $fetchresult;
     my $home=&homeserver($docuname,$docudom);
     if ($action eq 'propagate') {
@@ -1975,10 +2941,17 @@ sub process_coursefile {
             print $fh $env{'form.'.$source};
             close($fh);
             if ($parser eq 'parse') {
-                my $parse_result = &extract_embedded_items($filepath.'/'.$fname,$allfiles,$codebase);
-                unless ($parse_result eq 'ok') {
-                    &logthis('Failed to parse '.$filepath.'/'.$fname.' for embedded media: '.$parse_result);
+                my $mm = new File::MMagic;
+                my $type = $mm->checktype_filename($filepath.'/'.$fname);
+                if ($type eq 'text/html') {
+                    my $parse_result = &extract_embedded_items($filepath.'/'.$fname,$allfiles,$codebase);
+                    unless ($parse_result eq 'ok') {
+                        &logthis('Failed to parse '.$filepath.'/'.$fname.' for embedded media: '.$parse_result);
+                    }
                 }
+                if (ref($mimetype)) {
+                    $$mimetype = $type;
+                } 
             }
             $fetchresult= &reply('fetchuserfile:'.$docudom.'/'.$docuname.'/'.$file,
                                  $home);
@@ -2054,38 +3027,53 @@ sub clean_filename {
     $fname=~s/\.(\d+)(?=\.)/_$1/g;
     return $fname;
 }
-#This Function check if a Image max 400px width and height 500px. If not then scale the image down
+# This Function checks if an Image's dimensions exceed either $resizewidth (width) 
+# or $resizeheight (height) - both pixels. If so, the image is scaled to produce an 
+# image with the same aspect ratio as the original, but with dimensions which do 
+# not exceed $resizewidth and $resizeheight.
+ 
 sub resizeImage {
-	my($img_url) = @_;	
-	my $ima = Image::Magick->new;                       
-        $ima->Read($img_url);
-	if($ima->Get('width') > 400)
-	{
-		my $factor = $ima->Get('width')/400;
-             	$ima->Scale( width=>400, height=>$ima->Get('height')/$factor );
-	}
-	if($ima->Get('height') > 500)
-        {
-        	my $factor = $ima->Get('height')/500;
-                $ima->Scale( width=>$ima->Get('width')/$factor, height=>500);
-        } 
-		
-	$ima->Write($img_url);
-}
-
-#Wrapper function for userphotoupload
-sub userphotoupload
-{
-	my($formname,$subdir) = @_;
-	$upload_photo_form = 1;
-	return &userfileupload($formname,undef,$subdir);
+    my ($img_path,$resizewidth,$resizeheight) = @_;
+    my $ima = Image::Magick->new;
+    my $resized;
+    if (-e $img_path) {
+        $ima->Read($img_path);
+        if (($resizewidth =~ /^\d+$/) && ($resizeheight > 0)) {
+            my $width = $ima->Get('width');
+            my $height = $ima->Get('height');
+            if ($width > $resizewidth) {
+	        my $factor = $width/$resizewidth;
+                my $newheight = $height/$factor;
+                $ima->Scale(width=>$resizewidth,height=>$newheight);
+                $resized = 1;
+            }
+        }
+        if (($resizeheight =~ /^\d+$/) && ($resizeheight > 0)) {
+            my $width = $ima->Get('width');
+            my $height = $ima->Get('height');
+            if ($height > $resizeheight) {
+                my $factor = $height/$resizeheight;
+                my $newwidth = $width/$factor;
+                $ima->Scale(width=>$newwidth,height=>$resizeheight);
+                $resized = 1;
+            }
+        }
+        if ($resized) {
+            $ima->Write($img_path);
+        }
+    }
+    return;
 }
 
 # --------------- Take an uploaded file and put it into the userfiles directory
 # input: $formname - the contents of the file are in $env{"form.$formname"}
-#                    the desired filenam is in $env{"form.$formname.filename"}
-#        $coursedoc - if true up to the current course
-#                     if false
+#                    the desired filename is in $env{"form.$formname.filename"}
+#        $context - possible values: coursedoc, existingfile, overwrite, 
+#                                    canceloverwrite, or ''. 
+#                   if 'coursedoc': upload to the current course
+#                   if 'existingfile': write file to tmp/overwrites directory 
+#                   if 'canceloverwrite': delete file written to tmp/overwrites directory
+#                   $context is passed as argument to &finishuserfileupload
 #        $subdir - directory in userfile to store the file into
 #        $parser - instruction to parse file for objects ($parser = parse)    
 #        $allfiles - reference to hash for embedded objects
@@ -2094,38 +3082,62 @@ sub userphotoupload
 #        $dsetudom - domain for permanaent storage of uploaded file
 #        $thumbwidth - width (pixels) of thumbnail to make for uploaded image 
 #        $thumbheight - height (pixels) of thumbnail to make for uploaded image
+#        $resizewidth - width (pixels) to which to resize uploaded image
+#        $resizeheight - height (pixels) to which to resize uploaded image
+#        $mimetype - reference to scalar to accommodate mime type determined
+#                    from File::MMagic.
 # 
 # output: url of file in userspace, or error: <message> 
 #             or /adm/notfound.html if failure to upload occurse
 
-
 sub userfileupload {
-    my ($formname,$coursedoc,$subdir,$parser,$allfiles,$codebase,$destuname,
-        $destudom,$thumbwidth,$thumbheight)=@_;
+    my ($formname,$context,$subdir,$parser,$allfiles,$codebase,$destuname,
+        $destudom,$thumbwidth,$thumbheight,$resizewidth,$resizeheight,$mimetype)=@_;
     if (!defined($subdir)) { $subdir='unknown'; }
     my $fname=$env{'form.'.$formname.'.filename'};
     $fname=&clean_filename($fname);
-# See if there is anything left
+    # See if there is anything left
     unless ($fname) { return 'error: no uploaded file'; }
-    chop($env{'form.'.$formname});
-    if (($formname eq 'screenshot') && ($subdir eq 'helprequests')) { #files uploaded to help request form are handled differently
+    # Files uploaded to help request form, or uploaded to "create course" page are handled differently
+    if ((($formname eq 'screenshot') && ($subdir eq 'helprequests')) ||
+        (($formname eq 'coursecreatorxml') && ($subdir eq 'batchupload')) ||
+         ($context eq 'existingfile') || ($context eq 'canceloverwrite')) {
         my $now = time;
-        my $filepath = 'tmp/helprequests/'.$now;
-        my @parts=split(/\//,$filepath);
-        my $fullpath = $perlvar{'lonDaemons'};
-        for (my $i=0;$i<@parts;$i++) {
-            $fullpath .= '/'.$parts[$i];
-            if ((-e $fullpath)!=1) {
-                mkdir($fullpath,0777);
+        my $filepath;
+        if (($formname eq 'screenshot') && ($subdir eq 'helprequests')) {
+             $filepath = 'tmp/helprequests/'.$now;
+        } elsif (($formname eq 'coursecreatorxml') && ($subdir eq 'batchupload')) {
+             $filepath = 'tmp/addcourse/'.$destudom.'/web/'.$env{'user.name'}.
+                         '_'.$env{'user.domain'}.'/pending';
+        } elsif (($context eq 'existingfile') || ($context eq 'canceloverwrite')) {
+            my ($docuname,$docudom);
+            if ($destudom) {
+                $docudom = $destudom;
+            } else {
+                $docudom = $env{'user.domain'};
+            }
+            if ($destuname) {
+                $docuname = $destuname;
+            } else {
+                $docuname = $env{'user.name'};
+            }
+            if (exists($env{'form.group'})) {
+                $docuname=$env{'course.'.$env{'request.course.id'}.'.num'};
+                $docudom=$env{'course.'.$env{'request.course.id'}.'.domain'};
+            }
+            $filepath = 'tmp/overwrites/'.$docudom.'/'.$docuname.'/'.$subdir;
+            if ($context eq 'canceloverwrite') {
+                my $tempfile =  $perlvar{'lonDaemons'}.'/'.$filepath.'/'.$fname;
+                if (-e  $tempfile) {
+                    my @info = stat($tempfile);
+                    if ($info[9] eq $env{'form.timestamp'}) {
+                        unlink($tempfile);
+                    }
+                }
+                return;
             }
         }
-        open(my $fh,'>'.$fullpath.'/'.$fname);
-        print $fh $env{'form.'.$formname};
-        close($fh);
-        return $fullpath.'/'.$fname;
-    } elsif (($formname eq 'coursecreatorxml') && ($subdir eq 'batchupload')) { #files uploaded to create course page are handled differently
-        my $filepath = 'tmp/addcourse/'.$destudom.'/web/'.$env{'user.name'}.
-                       '_'.$env{'user.domain'}.'/pending';
+        # Create the directory if not present
         my @parts=split(/\//,$filepath);
         my $fullpath = $perlvar{'lonDaemons'};
         for (my $i=0;$i<@parts;$i++) {
@@ -2137,31 +3149,39 @@ sub userfileupload {
         open(my $fh,'>'.$fullpath.'/'.$fname);
         print $fh $env{'form.'.$formname};
         close($fh);
-        return $fullpath.'/'.$fname;
+        if ($context eq 'existingfile') {
+            my @info = stat($fullpath.'/'.$fname);
+            return ($fullpath.'/'.$fname,$info[9]);
+        } else {
+            return $fullpath.'/'.$fname;
+        }
     }
-    
-# Create the directory if not present
-    $fname="$subdir/$fname";
-    if ($coursedoc) {
+    if ($subdir eq 'scantron') {
+        $fname = 'scantron_orig_'.$fname;
+    } else {
+        $fname="$subdir/$fname";
+    }
+    if ($context eq 'coursedoc') {
 	my $docuname=$env{'course.'.$env{'request.course.id'}.'.num'};
 	my $docudom=$env{'course.'.$env{'request.course.id'}.'.domain'};
         if ($env{'form.folder'} =~ m/^(default|supplemental)/) {
             return &finishuserfileupload($docuname,$docudom,
 					 $formname,$fname,$parser,$allfiles,
-					 $codebase,$thumbwidth,$thumbheight);
+					 $codebase,$thumbwidth,$thumbheight,
+                                         $resizewidth,$resizeheight,$context,$mimetype);
         } else {
             $fname=$env{'form.folder'}.'/'.$fname;
             return &process_coursefile('uploaddoc',$docuname,$docudom,
 				       $fname,$formname,$parser,
-				       $allfiles,$codebase);
+				       $allfiles,$codebase,$mimetype);
         }
     } elsif (defined($destuname)) {
         my $docuname=$destuname;
         my $docudom=$destudom;
 	return &finishuserfileupload($docuname,$docudom,$formname,$fname,
 				     $parser,$allfiles,$codebase,
-                                     $thumbwidth,$thumbheight);
-        
+                                     $thumbwidth,$thumbheight,
+                                     $resizewidth,$resizeheight,$context,$mimetype);
     } else {
         my $docuname=$env{'user.name'};
         my $docudom=$env{'user.domain'};
@@ -2171,13 +3191,14 @@ sub userfileupload {
         }
 	return &finishuserfileupload($docuname,$docudom,$formname,$fname,
 				     $parser,$allfiles,$codebase,
-                                     $thumbwidth,$thumbheight);
+                                     $thumbwidth,$thumbheight,
+                                     $resizewidth,$resizeheight,$context,$mimetype);
     }
 }
 
 sub finishuserfileupload {
     my ($docuname,$docudom,$formname,$fname,$parser,$allfiles,$codebase,
-        $thumbwidth,$thumbheight) = @_;
+        $thumbwidth,$thumbheight,$resizewidth,$resizeheight,$context,$mimetype) = @_;
     my $path=$docudom.'/'.$docuname.'/';
     my $filepath=$perlvar{'lonDocRoot'};
   
@@ -2203,24 +3224,53 @@ sub finishuserfileupload {
 	    print STDERR ('Failed to create '.$filepath.'/'.$file."\n");
 	    return '/adm/notfound.html';
 	}
-	if (!print FH ($env{'form.'.$formname})) {
+        if ($context eq 'overwrite') {
+            my $source =  LONCAPA::tempdir().'/overwrites/'.$docudom.'/'.$docuname.'/'.$fname;
+            my $target = $filepath.'/'.$file;
+            if (-e $source) {
+                my @info = stat($source);
+                if ($info[9] eq $env{'form.timestamp'}) {   
+                    unless (&File::Copy::move($source,$target)) {
+                        &logthis('Failed to overwrite '.$filepath.'/'.$file);
+                        return "Moving from $source failed";
+                    }
+                } else {
+                    return "Temporary file: $source had unexpected date/time for last modification";
+                }
+            } else {
+                return "Temporary file: $source missing";
+            }
+        } elsif (!print FH ($env{'form.'.$formname})) {
 	    &logthis('Failed to write to '.$filepath.'/'.$file);
 	    print STDERR ('Failed to write to '.$filepath.'/'.$file."\n");
 	    return '/adm/notfound.html';
 	}
 	close(FH);
-	if($upload_photo_form==1)
-	{
-		resizeImage($filepath.'/'.$file);		
-		$upload_photo_form = 0;
+        if ($resizewidth && $resizeheight) {
+            my $mm = new File::MMagic;
+            my $mime_type = $mm->checktype_filename($filepath.'/'.$file);
+            if ($mime_type =~ m{^image/}) {
+	        &resizeImage($filepath.'/'.$file,$resizewidth,$resizeheight);
+            }  
 	}
     }
+    if (($context eq 'coursedoc') || ($parser eq 'parse')) {
+        if (ref($mimetype)) {
+            if ($$mimetype eq '') {
+                my $mm = new File::MMagic;
+                my $type = $mm->checktype_filename($filepath.'/'.$file);
+                $$mimetype = $type;
+            }
+        }
+    }
     if ($parser eq 'parse') {
-        my $parse_result = &extract_embedded_items($filepath.'/'.$file,$allfiles,
-						   $codebase);
-        unless ($parse_result eq 'ok') {
-            &logthis('Failed to parse '.$filepath.$file.
-		     ' for embedded media: '.$parse_result); 
+        if ((ref($mimetype)) && ($$mimetype eq 'text/html')) {
+            my $parse_result = &extract_embedded_items($filepath.'/'.$file,
+                                                       $allfiles,$codebase);
+            unless ($parse_result eq 'ok') {
+                &logthis('Failed to parse '.$filepath.$file.
+	   	         ' for embedded media: '.$parse_result); 
+            }
         }
     }
     if (($thumbwidth =~ /^\d+$/) && ($thumbheight =~ /^\d+$/)) {
@@ -2258,6 +3308,7 @@ sub finishuserfileupload {
 sub extract_embedded_items {
     my ($fullpath,$allfiles,$codebase,$content) = @_;
     my @state = ();
+    my (%lastids,%related,%shockwave,%flashvars);
     my %javafiles = (
                       codebase => '',
                       code => '',
@@ -2287,10 +3338,30 @@ sub extract_embedded_items {
 		&add_filetype($allfiles,$attr->{'href'},'href');
 	    }
             if (lc($tagname) eq 'script') {
+                my $src;
                 if ($attr->{'archive'} =~ /\.jar$/i) {
                     &add_filetype($allfiles,$attr->{'archive'},'archive');
                 } else {
-                    &add_filetype($allfiles,$attr->{'src'},'src');
+                    if ($attr->{'src'} ne '') {
+                        $src = $attr->{'src'};
+                        &add_filetype($allfiles,$src,'src');
+                    }
+                }
+                my $text = $p->get_trimmed_text();
+                if ($text =~ /\Qswfobject.registerObject(\E([^\)]+)\)/) {
+                    my @swfargs = split(/,/,$1);
+                    foreach my $item (@swfargs) {
+                        $item =~ s/["']//g;
+                        $item =~ s/^\s+//;
+                        $item =~ s/\s+$//;
+                    }
+                    if (($swfargs[0] ne'') && ($swfargs[2] ne '')) {
+                        if (ref($related{$swfargs[0]}) eq 'ARRAY') {
+                            push(@{$related{$swfargs[0]}},$swfargs[2]);
+                        } else {
+                            $related{$swfargs[0]} = [$swfargs[2]];
+                        }
+                    }
                 }
             }
             if (lc($tagname) eq 'link') {
@@ -2303,6 +3374,9 @@ sub extract_embedded_items {
 		foreach my $item (keys(%javafiles)) {
 		    $javafiles{$item} = '';
 		}
+                if ((lc($tagname) eq 'object') && (lc($state[-2]) ne 'object')) {
+                    $lastids{lc($tagname)} = $attr->{'id'};
+                }
 	    }
 	    if (lc($state[-2]) eq 'object' && lc($tagname) eq 'param') {
 		my $name = lc($attr->{'name'});
@@ -2312,12 +3386,22 @@ sub extract_embedded_items {
 			last;
 		    }
 		}
+                my $pathfrom;
 		foreach my $item (keys(%mediafiles)) {
 		    if ($name eq $item) {
-			&add_filetype($allfiles, $attr->{'value'}, 'value');
+                        $pathfrom = $attr->{'value'};
+                        $shockwave{$lastids{lc($state[-2])}} = $pathfrom;
+			&add_filetype($allfiles,$pathfrom,$name);
 			last;
 		    }
 		}
+                if ($name eq 'flashvars') {
+                    $flashvars{$lastids{lc($state[-2])}} = $attr->{'value'};
+                }
+                if ($pathfrom ne '') {
+                    &embedded_dependency($allfiles,\%related,$lastids{lc($state[-2])},
+                                         $pathfrom);
+                }
 	    }
 	    if (lc($tagname) eq 'embed' || lc($tagname) eq 'applet') {
 		foreach my $item (keys(%javafiles)) {
@@ -2332,7 +3416,16 @@ sub extract_embedded_items {
 			last;
 		    }
 		}
+                if (lc($tagname) eq 'embed') {
+                    if (($attr->{'name'} ne '') && ($attr->{'src'} ne '')) {
+                        &embedded_dependency($allfiles,\%related,$attr->{'name'},
+                                             $attr->{'src'});
+                    }
+                }
 	    }
+            if ($t->[4] =~ m{/>$}) {
+                pop(@state);  
+            }
 	} elsif ($t->[0] eq 'E') {
 	    my ($tagname) = ($t->[1]);
 	    if ($javafiles{'codebase'} ne '') {
@@ -2352,6 +3445,23 @@ sub extract_embedded_items {
 	    pop @state;
 	}
     }
+    foreach my $id (sort(keys(%flashvars))) {
+        if ($shockwave{$id} ne '') {
+            my @pairs = split(/\&/,$flashvars{$id});
+            foreach my $pair (@pairs) {
+                my ($key,$value) = split(/\=/,$pair);
+                if ($key eq 'thumb') {
+                    &add_filetype($allfiles,$value,$key);
+                } elsif ($key eq 'content') {
+                    my ($path) = ($shockwave{$id} =~ m{^(.+/)[^/]+$});
+                    my ($ext) = ($value =~ /\.([^.]+)$/);
+                    if ($ext ne '') {
+                        &add_filetype($allfiles,$path.$value,$ext);
+                    }
+                }
+            }
+        }
+    }
     return 'ok';
 }
 
@@ -2366,6 +3476,21 @@ sub add_filetype {
     }
 }
 
+sub embedded_dependency {
+    my ($allfiles,$related,$identifier,$pathfrom) = @_;
+    if ((ref($allfiles) eq 'HASH') && (ref($related) eq 'HASH')) {
+        if (($identifier ne '') &&
+            (ref($related->{$identifier}) eq 'ARRAY') &&
+            ($pathfrom ne '')) {
+            my ($path) = ($pathfrom =~ m{^(.+/)[^/]+$});
+            foreach my $dep (@{$related->{$identifier}}) {
+                &add_filetype($allfiles,$path.$dep,'object');
+            }
+        }
+    }
+    return;
+}
+
 sub removeuploadedurl {
     my ($url)=@_;	
     my (undef,undef,$udom,$uname,$fname)=split('/',$url,5);    
@@ -2492,15 +3617,10 @@ sub flushcourselogs {
             my $result = &inc('nohist_accesscount',\%temphash,$dom,$name);
             if ($result eq 'ok') {
                 delete $accesshash{$entry};
-            } elsif ($result eq 'unknown_cmd') {
-                # Target server has old code running on it.
-                my %temphash=($entry => $value);
-                if (&put('nohist_resevaldata',\%temphash,$dom,$name) eq 'ok') {
-                    delete $accesshash{$entry};
-                }
             }
         } else {
             my ($dom,$name) = ($entry=~m{___($match_domain)/($match_name)/(.*)___(\w+)$});
+            if (($dom eq 'uploaded') || ($dom eq 'adm')) { next; }
             my %temphash=($entry => $accesshash{$entry});
             if (&put('nohist_resevaldata',\%temphash,$dom,$name) eq 'ok') {
                 delete $accesshash{$entry};
@@ -2524,7 +3644,7 @@ sub flushcourselogs {
 # Reverse lookup of domain roles (dc, ad, li, sc, au)
 #
     my %domrolebuffer = ();
-    foreach my $entry (keys %domainrolehash) {
+    foreach my $entry (keys(%domainrolehash)) {
         my ($role,$uname,$udom,$runame,$rudom,$rsec)=split(/:/,$entry);
         if ($domrolebuffer{$rudom}) {
             $domrolebuffer{$rudom}.='&'.&escape($entry).
@@ -2579,7 +3699,7 @@ sub courseacclog {
     my $fnsymb=shift;
     unless ($env{'request.course.id'}) { return ''; }
     my $what=$fnsymb.':'.$env{'user.name'}.':'.$env{'user.domain'};
-    if ($fnsymb=~/(problem|exam|quiz|assess|survey|form|task|page)$/) {
+    if ($fnsymb=~/$LONCAPA::assess_re/) {
         $what.=':POST';
         # FIXME: Probably ought to escape things....
 	foreach my $key (keys(%env)) {
@@ -2611,7 +3731,13 @@ sub countacc {
     my $url=&declutter(shift);
     return if (! defined($url) || $url eq '');
     unless ($env{'request.course.id'}) { return ''; }
+#
+# Mark that this url was used in this course
+#
     $accesshash{$env{'request.course.id'}.'___'.$url.'___course'}=1;
+#
+# Increase the access count for this resource in this child process
+#
     my $key=$$.$processmarker.'_'.$dumpcount.'___'.$url.'___count';
     $accesshash{$key}++;
 }
@@ -2623,30 +3749,37 @@ sub linklog {
     $accesshash{$from.'___'.$to.'___comefrom'}=1;
     $accesshash{$to.'___'.$from.'___goto'}=1;
 }
+
+sub statslog {
+    my ($symb,$part,$users,$av_attempts,$degdiff)=@_;
+    if ($users<2) { return; }
+    my %dynstore=&LONCAPA::lonmetadata::dynamic_metadata_storage({
+            'course'       => $env{'request.course.id'},
+            'sections'     => '"all"',
+            'num_students' => $users,
+            'part'         => $part,
+            'symb'         => $symb,
+            'mean_tries'   => $av_attempts,
+            'deg_of_diff'  => $degdiff});
+    foreach my $key (keys(%dynstore)) {
+        $accesshash{$key}=$dynstore{$key};
+    }
+}
   
 sub userrolelog {
     my ($trole,$username,$domain,$area,$tstart,$tend)=@_;
-    if (($trole=~/^ca/) || ($trole=~/^aa/) ||
-        ($trole=~/^in/) || ($trole=~/^cc/) ||
-        ($trole=~/^ep/) || ($trole=~/^cr/) ||
-        ($trole=~/^ta/)) {
+    if ( $trole =~ /^(ca|aa|in|cc|ep|cr|ta|co)/ ) {
        my (undef,$rudom,$runame,$rsec)=split(/\//,$area);
        $userrolehash
          {$trole.':'.$username.':'.$domain.':'.$runame.':'.$rudom.':'.$rsec}
                     =$tend.':'.$tstart;
     }
-    if (($env{'request.role'} =~ /dc\./) &&
-	(($trole=~/^au/) || ($trole=~/^in/) ||
-	 ($trole=~/^cc/) || ($trole=~/^ep/) ||
-	 ($trole=~/^cr/) || ($trole=~/^ta/))) {
+    if ($env{'request.role'} =~ /dc\./ && $trole =~ /^(au|in|cc|ep|cr|ta|co)/) {
        $userrolehash
          {$trole.':'.$username.':'.$domain.':'.$env{'user.name'}.':'.$env{'user.domain'}.':'}
                     =$tend.':'.$tstart;
     }
-    if (($trole=~/^dc/) || ($trole=~/^ad/) ||
-        ($trole=~/^li/) || ($trole=~/^li/) ||
-        ($trole=~/^au/) || ($trole=~/^dg/) ||
-        ($trole=~/^sc/)) {
+    if ($trole =~ /^(dc|ad|li|au|dg|sc)/ ) {
        my (undef,$rudom,$runame,$rsec)=split(/\//,$area);
        $domainrolehash
          {$trole.':'.$username.':'.$domain.':'.$runame.':'.$rudom.':'.$rsec}
@@ -2656,34 +3789,70 @@ sub userrolelog {
 
 sub courserolelog {
     my ($trole,$username,$domain,$area,$tstart,$tend,$delflag,$selfenroll,$context)=@_;
-    if (($trole eq 'cc') || ($trole eq 'in') ||
-        ($trole eq 'ep') || ($trole eq 'ad') ||
-        ($trole eq 'ta') || ($trole eq 'st') ||
-        ($trole=~/^cr/) || ($trole eq 'gr')) {
-        if ($area =~ m-^/($match_domain)/($match_courseid)/?([^/]*)-) {
-            my $cdom = $1;
-            my $cnum = $2;
-            my $sec = $3;
-            my $namespace = 'rolelog';
-            my %storehash = (
-                               role    => $trole,
-                               start   => $tstart,
-                               end     => $tend,
-                               selfenroll => $selfenroll,
-                               context    => $context,
-                            );
-            if ($trole eq 'gr') {
-                $namespace = 'groupslog';
-                $storehash{'group'} = $sec;
-            } else {
-                $storehash{'section'} = $sec;
-            }
-            &instructor_log($namespace,\%storehash,$delflag,$username,$domain,$cnum,$cdom);
+    if ($area =~ m-^/($match_domain)/($match_courseid)/?([^/]*)-) {
+        my $cdom = $1;
+        my $cnum = $2;
+        my $sec = $3;
+        my $namespace = 'rolelog';
+        my %storehash = (
+                           role    => $trole,
+                           start   => $tstart,
+                           end     => $tend,
+                           selfenroll => $selfenroll,
+                           context    => $context,
+                        );
+        if ($trole eq 'gr') {
+            $namespace = 'groupslog';
+            $storehash{'group'} = $sec;
+        } else {
+            $storehash{'section'} = $sec;
+        }
+        &write_log('course',$namespace,\%storehash,$delflag,$username,
+                   $domain,$cnum,$cdom);
+        if (($trole ne 'st') || ($sec ne '')) {
+            &devalidate_cache_new('getcourseroles',$cdom.'_'.$cnum);
         }
     }
     return;
 }
 
+sub domainrolelog {
+    my ($trole,$username,$domain,$area,$tstart,$tend,$delflag,$context)=@_;
+    if ($area =~ m{^/($match_domain)/$}) {
+        my $cdom = $1;
+        my $domconfiguser = &Apache::lonnet::get_domainconfiguser($cdom);
+        my $namespace = 'rolelog';
+        my %storehash = (
+                           role    => $trole,
+                           start   => $tstart,
+                           end     => $tend,
+                           context => $context,
+                        );
+        &write_log('domain',$namespace,\%storehash,$delflag,$username,
+                   $domain,$domconfiguser,$cdom);
+    }
+    return;
+
+}
+
+sub coauthorrolelog {
+    my ($trole,$username,$domain,$area,$tstart,$tend,$delflag,$context)=@_;
+    if ($area =~ m{^/($match_domain)/($match_username)$}) {
+        my $audom = $1;
+        my $auname = $2;
+        my $namespace = 'rolelog';
+        my %storehash = (
+                           role    => $trole,
+                           start   => $tstart,
+                           end     => $tend,
+                           context => $context,
+                        );
+        &write_log('author',$namespace,\%storehash,$delflag,$username,
+                   $domain,$auname,$audom);
+    }
+    return;
+}
+
 sub get_course_adv_roles {
     my ($cid,$codes) = @_;
     $cid=$env{'request.course.id'} unless (defined($cid));
@@ -2701,15 +3870,29 @@ sub get_course_adv_roles {
     my %dumphash=
             &dump('nohist_userroles',$coursehash{'domain'},$coursehash{'num'});
     my $now=time;
-    foreach my $entry (keys %dumphash) {
+    my %privileged;
+    foreach my $entry (keys(%dumphash)) {
 	my ($tend,$tstart)=split(/\:/,$dumphash{$entry});
         if (($tstart) && ($tstart<0)) { next; }
         if (($tend) && ($tend<$now)) { next; }
         if (($tstart) && ($now<$tstart)) { next; }
         my ($role,$username,$domain,$section)=split(/\:/,$entry);
 	if ($username eq '' || $domain eq '') { next; }
-	if ((&privileged($username,$domain)) && 
-	    (!$nothide{$username.':'.$domain})) { next; }
+        unless (ref($privileged{$domain}) eq 'HASH') {
+            my %dompersonnel =
+                &Apache::lonnet::get_domain_roles($domain,['dc'],$now,$now);
+            $privileged{$domain} = {};
+            foreach my $server (keys(%dompersonnel)) {
+                if (ref($dompersonnel{$server}) eq 'HASH') {
+                    foreach my $user (keys(%{$dompersonnel{$server}})) {
+                        my ($trole,$uname,$udom) = split(/:/,$user);
+                        $privileged{$udom}{$uname} = 1;
+                    }
+                }
+            }
+        }
+        if ((exists($privileged{$domain}{$username})) && 
+            (!$nothide{$username.':'.$domain})) { next; }
 	if ($role eq 'cr') { next; }
         if ($codes) {
             if ($section) { $role .= ':'.$section; }
@@ -2736,7 +3919,7 @@ sub get_my_roles {
     unless (defined($uname)) { $uname=$env{'user.name'}; }
     unless (defined($udom)) { $udom=$env{'user.domain'}; }
     my (%dumphash,%nothide);
-    if ($context eq 'userroles') { 
+    if ($context eq 'userroles') {
         %dumphash = &dump('roles',$udom,$uname);
     } else {
         %dumphash=
@@ -2754,9 +3937,11 @@ sub get_my_roles {
     }
     my %returnhash=();
     my $now=time;
+    my %privileged;
     foreach my $entry (keys(%dumphash)) {
         my ($role,$tend,$tstart);
         if ($context eq 'userroles') {
+            next if ($entry =~ /^rolesdef/);
 	    ($role,$tend,$tstart)=split(/_/,$dumphash{$entry});
         } else {
             ($tend,$tstart)=split(/\:/,$dumphash{$entry});
@@ -2780,7 +3965,7 @@ sub get_my_roles {
         }
         my ($rolecode,$username,$domain,$section,$area);
         if ($context eq 'userroles') {
-            ($area,$rolecode) = split(/_/,$entry);
+            ($area,$rolecode) = ($entry =~ /^(.+)_([^_]+)$/);
             (undef,$domain,$username,$section) = split(/\//,$area);
         } else {
             ($role,$username,$domain,$section) = split(/\:/,$entry);
@@ -2796,15 +3981,42 @@ sub get_my_roles {
                     if (!grep(/^cr$/,@{$roles})) {
                         next;
                     }
+                } elsif ($role =~ /^gr\//) {
+                    if (!grep(/^gr$/,@{$roles})) {
+                        next;
+                    }
                 } else {
                     next;
                 }
             }
         }
         if ($hidepriv) {
-            if ((&privileged($username,$domain)) &&
-                (!$nothide{$username.':'.$domain})) { 
-                next;
+            if ($context eq 'userroles') {
+                if ((&privileged($username,$domain)) &&
+                    (!$nothide{$username.':'.$domain})) {
+                    next;
+                }
+            } else {
+                unless (ref($privileged{$domain}) eq 'HASH') {
+                    my %dompersonnel =
+                        &Apache::lonnet::get_domain_roles($domain,['dc'],$now,$now);
+                    $privileged{$domain} = {};
+                    if (keys(%dompersonnel)) {
+                        foreach my $server (keys(%dompersonnel)) {
+                            if (ref($dompersonnel{$server}) eq 'HASH') {
+                                foreach my $user (keys(%{$dompersonnel{$server}})) {
+                                    my ($trole,$uname,$udom) = split(/:/,$user);
+                                    $privileged{$udom}{$uname} = $trole;
+                                }
+                            }
+                        }
+                    }
+                }
+                if (exists($privileged{$domain}{$username})) {
+                    if (!$nothide{$username.':'.$domain}) {
+                        next;
+                    }
+                }
             }
         }
         if ($withsec) {
@@ -2852,6 +4064,7 @@ sub getannounce {
 
 sub courseidput {
     my ($domain,$storehash,$coursehome,$caller) = @_;
+    return unless (ref($storehash) eq 'HASH');
     my $outcome;
     if ($caller eq 'timeonly') {
         my $cids = '';
@@ -2890,7 +4103,8 @@ sub courseidput {
 sub courseiddump {
     my ($domfilter,$descfilter,$sincefilter,$instcodefilter,$ownerfilter,
         $coursefilter,$hostidflag,$hostidref,$typefilter,$regexp_ok,
-        $selfenrollonly,$catfilter,$showhidden,$caller)=@_;
+        $selfenrollonly,$catfilter,$showhidden,$caller,$cloner,$cc_clone,
+        $cloneonly,$createdbefore,$createdafter,$creationcontext,$domcloner)=@_;
     my $as_hash = 1;
     my %returnhash;
     if (!$domfilter) { $domfilter=''; }
@@ -2902,14 +4116,32 @@ sub courseiddump {
 
 	    if (($domfilter eq '') ||
 		(&host_domain($tryserver) eq $domfilter)) {
-                my $rep = 
-                  &reply('courseiddump:'.&host_domain($tryserver).':'.
-                         $sincefilter.':'.&escape($descfilter).':'.
-                         &escape($instcodefilter).':'.&escape($ownerfilter).
-                         ':'.&escape($coursefilter).':'.&escape($typefilter).
-                         ':'.&escape($regexp_ok).':'.$as_hash.':'.
-                         &escape($selfenrollonly).':'.&escape($catfilter).':'.
-                         $showhidden.':'.$caller,$tryserver);
+                my $rep;
+                if (grep { $_ eq $tryserver } current_machine_ids()) {
+                    $rep = LONCAPA::Lond::dump_course_id_handler(
+                        join(":", (&host_domain($tryserver), $sincefilter, 
+                                &escape($descfilter), &escape($instcodefilter), 
+                                &escape($ownerfilter), &escape($coursefilter),
+                                &escape($typefilter), &escape($regexp_ok), 
+                                $as_hash, &escape($selfenrollonly), 
+                                &escape($catfilter), $showhidden, $caller, 
+                                &escape($cloner), &escape($cc_clone), $cloneonly, 
+                                &escape($createdbefore), &escape($createdafter), 
+                                &escape($creationcontext), $domcloner)));
+                } else {
+                    $rep = &reply('courseiddump:'.&host_domain($tryserver).':'.
+                             $sincefilter.':'.&escape($descfilter).':'.
+                             &escape($instcodefilter).':'.&escape($ownerfilter).
+                             ':'.&escape($coursefilter).':'.&escape($typefilter).
+                             ':'.&escape($regexp_ok).':'.$as_hash.':'.
+                             &escape($selfenrollonly).':'.&escape($catfilter).':'.
+                             $showhidden.':'.$caller.':'.&escape($cloner).':'.
+                             &escape($cc_clone).':'.$cloneonly.':'.
+                             &escape($createdbefore).':'.&escape($createdafter).':'.
+                             &escape($creationcontext).':'.$domcloner,
+                             $tryserver);
+                }
+                     
                 my @pairs=split(/\&/,$rep);
                 foreach my $item (@pairs) {
                     my ($key,$value)=split(/\=/,$item,2);
@@ -2924,7 +4156,7 @@ sub courseiddump {
                         for (my $i=0; $i<@responses; $i++) {
                             $returnhash{$key}{$items[$i]} = &unescape($responses[$i]);
                         }
-                    } 
+                    }
                 }
             }
         }
@@ -2932,6 +4164,49 @@ sub courseiddump {
     return %returnhash;
 }
 
+sub courselastaccess {
+    my ($cdom,$cnum,$hostidref) = @_;
+    my %returnhash;
+    if ($cdom && $cnum) {
+        my $chome = &homeserver($cnum,$cdom);
+        if ($chome ne 'no_host') {
+            my $rep = &reply('courselastaccess:'.$cdom.':'.$cnum,$chome);
+            &extract_lastaccess(\%returnhash,$rep);
+        }
+    } else {
+        if (!$cdom) { $cdom=''; }
+        my %libserv = &all_library();
+        foreach my $tryserver (keys(%libserv)) {
+            if (ref($hostidref) eq 'ARRAY') {
+                next unless (grep(/^\Q$tryserver\E$/,@{$hostidref}));
+            } 
+            if (($cdom eq '') || (&host_domain($tryserver) eq $cdom)) {
+                my $rep = &reply('courselastaccess:'.&host_domain($tryserver).':',$tryserver);
+                &extract_lastaccess(\%returnhash,$rep);
+            }
+        }
+    }
+    return %returnhash;
+}
+
+sub extract_lastaccess {
+    my ($returnhash,$rep) = @_;
+    if (ref($returnhash) eq 'HASH') {
+        unless ($rep eq 'unknown_command' || $rep eq 'no_such_host' || 
+                $rep eq 'con_lost' || $rep eq 'rejected' || $rep eq 'refused' ||
+                 $rep eq '') {
+            my @pairs=split(/\&/,$rep);
+            foreach my $item (@pairs) {
+                my ($key,$value)=split(/\=/,$item,2);
+                $key = &unescape($key);
+                next if ($key =~ /^error: 2 /);
+                $returnhash->{$key} = &thaw_unescape($value);
+            }
+        }
+    }
+    return;
+}
+
 # ---------------------------------------------------------- DC e-mail
 
 sub dcmailput {
@@ -2964,10 +4239,10 @@ sub dcmaildump {
 
 sub get_domain_roles {
     my ($dom,$roles,$startdate,$enddate)=@_;
-    if (undef($startdate) || $startdate eq '') {
+    if ((!defined($startdate)) || ($startdate eq '')) {
         $startdate = '.';
     }
-    if (undef($enddate) || $enddate eq '') {
+    if ((!defined($enddate)) || ($enddate eq '')) {
         $enddate = '.';
     }
     my $rolelist;
@@ -2992,13 +4267,36 @@ sub get_domain_roles {
     return %personnel;
 }
 
-# ----------------------------------------------------------- Check out an item
+# ----------------------------------------------------------- Interval timing 
+
+{
+# Caches needed for speedup of navmaps
+# We don't want to cache this for very long at all (5 seconds at most)
+# 
+# The user for whom we cache
+my $cachedkey='';
+# The cached times for this user
+my %cachedtimes=();
+# When this was last done
+my $cachedtime=();
+
+sub load_all_first_access {
+    my ($uname,$udom)=@_;
+    if (($cachedkey eq $uname.':'.$udom) &&
+        (abs($cachedtime-time)<5) && (!$env{'form.markaccess'})) {
+        return;
+    }
+    $cachedtime=time;
+    $cachedkey=$uname.':'.$udom;
+    %cachedtimes=&dump('firstaccesstimes',$udom,$uname);
+}
 
 sub get_first_access {
-    my ($type,$argsymb)=@_;
+    my ($type,$argsymb,$argmap)=@_;
     my ($symb,$courseid,$udom,$uname)=&whichuser();
     if ($argsymb) { $symb=$argsymb; }
     my ($map,$id,$res)=&decode_symb($symb);
+    if ($argmap) { $map = $argmap; }
     if ($type eq 'course') {
 	$res='course';
     } elsif ($type eq 'map') {
@@ -3006,12 +4304,12 @@ sub get_first_access {
     } else {
 	$res=$symb;
     }
-    my %times=&get('firstaccesstimes',["$courseid\0$res"],$udom,$uname);
-    return $times{"$courseid\0$res"};
+    &load_all_first_access($uname,$udom);
+    return $cachedtimes{"$courseid\0$res"};
 }
 
 sub set_first_access {
-    my ($type)=@_;
+    my ($type,$interval)=@_;
     my ($symb,$courseid,$udom,$uname)=&whichuser();
     my ($map,$id,$res)=&decode_symb($symb);
     if ($type eq 'course') {
@@ -3021,98 +4319,27 @@ sub set_first_access {
     } else {
 	$res=$symb;
     }
-    my $firstaccess=&get_first_access($type,$symb);
+    $cachedkey='';
+    my $firstaccess=&get_first_access($type,$symb,$map);
     if (!$firstaccess) {
-	return &put('firstaccesstimes',{"$courseid\0$res"=>time},$udom,$uname);
+        my $start = time;
+	my $putres = &put('firstaccesstimes',{"$courseid\0$res"=>$start},
+                          $udom,$uname);
+        if ($putres eq 'ok') {
+            &put('timerinterval',{"$courseid\0$res"=>$interval},
+                 $udom,$uname); 
+            &appenv(
+                     {
+                        'course.'.$courseid.'.firstaccess.'.$res   => $start,
+                        'course.'.$courseid.'.timerinterval.'.$res => $interval,
+                     }
+                  );
+        }
+        return $putres;
     }
     return 'already_set';
 }
-
-sub checkout {
-    my ($symb,$tuname,$tudom,$tcrsid)=@_;
-    my $now=time;
-    my $lonhost=$perlvar{'lonHostID'};
-    my $infostr=&escape(
-                 'CHECKOUTTOKEN&'.
-                 $tuname.'&'.
-                 $tudom.'&'.
-                 $tcrsid.'&'.
-                 $symb.'&'.
-		 $now.'&'.$ENV{'REMOTE_ADDR'});
-    my $token=&reply('tmpput:'.$infostr,$lonhost);
-    if ($token=~/^error\:/) { 
-        &logthis("<font color=\"blue\">WARNING: ".
-                "Checkout tmpput failed ".$tudom.' - '.$tuname.' - '.$symb.
-                 "</font>");
-        return ''; 
-    }
-
-    $token=~s/^(\d+)\_.*\_(\d+)$/$1\*$2\*$lonhost/;
-    $token=~tr/a-z/A-Z/;
-
-    my %infohash=('resource.0.outtoken' => $token,
-                  'resource.0.checkouttime' => $now,
-                  'resource.0.outremote' => $ENV{'REMOTE_ADDR'});
-
-    unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
-       return '';
-    } else {
-        &logthis("<font color=\"blue\">WARNING: ".
-                "Checkout cstore failed ".$tudom.' - '.$tuname.' - '.$symb.
-                 "</font>");
-    }    
-
-    if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
-                         &escape('Checkout '.$infostr.' - '.
-                                                 $token)) ne 'ok') {
-	return '';
-    } else {
-        &logthis("<font color=\"blue\">WARNING: ".
-                "Checkout log failed ".$tudom.' - '.$tuname.' - '.$symb.
-                 "</font>");
-    }
-    return $token;
 }
-
-# ------------------------------------------------------------ Check in an item
-
-sub checkin {
-    my $token=shift;
-    my $now=time;
-    my ($ta,$tb,$lonhost)=split(/\*/,$token);
-    $lonhost=~tr/A-Z/a-z/;
-    my $dtoken=$ta.'_'.&hostname($lonhost).'_'.$tb;
-    $dtoken=~s/\W/\_/g;
-    my ($dummy,$tuname,$tudom,$tcrsid,$symb,$chtim,$rmaddr)=
-                 split(/\&/,&unescape(&reply('tmpget:'.$dtoken,$lonhost)));
-
-    unless (($tuname) && ($tudom)) {
-        &logthis('Check in '.$token.' ('.$dtoken.') failed');
-        return '';
-    }
-    
-    unless (&allowed('mgr',$tcrsid)) {
-        &logthis('Check in '.$token.' ('.$dtoken.') unauthorized: '.
-                 $env{'user.name'}.' - '.$env{'user.domain'});
-        return '';
-    }
-
-    my %infohash=('resource.0.intoken' => $token,
-                  'resource.0.checkintime' => $now,
-                  'resource.0.inremote' => $ENV{'REMOTE_ADDR'});
-
-    unless (&cstore(\%infohash,$symb,$tcrsid,$tudom,$tuname) eq 'ok') {
-       return '';
-    }    
-
-    if (&log($tudom,$tuname,&homeserver($tuname,$tudom),
-                         &escape('Checkin - '.$token)) ne 'ok') {
-	return '';
-    }
-
-    return ($symb,$tuname,$tudom,$tcrsid);    
-}
-
 # --------------------------------------------- Set Expire Date for Spreadsheet
 
 sub expirespread {
@@ -3217,7 +4444,7 @@ sub hashref2str {
       $result.='=';
       #print("Got a ref of ".(ref($key))." skipping.");
     } else {
-	if ($key) {$result.=&escape($key).'=';} else { last; }
+	if (defined($key)) {$result.=&escape($key).'=';} else { last; }
     }
 
     if(ref($hashref->{$key}) eq 'ARRAY') {
@@ -3369,12 +4596,12 @@ sub tmpreset {
   if ($domain eq 'public' && $stuname eq 'public') {
       $stuname=$ENV{'REMOTE_ADDR'};
   }
-  my $path=$perlvar{'lonDaemons'}.'/tmp';
+  my $path=LONCAPA::tempdir();
   my %hash;
   if (tie(%hash,'GDBM_File',
 	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
 	  &GDBM_WRCREAT(),0640)) {
-    foreach my $key (keys %hash) {
+    foreach my $key (keys(%hash)) {
       if ($key=~ /:$symb/) {
 	delete($hash{$key});
       }
@@ -3408,7 +4635,7 @@ sub tmpstore {
   }
   my $now=time;
   my %hash;
-  my $path=$perlvar{'lonDaemons'}.'/tmp';
+  my $path=LONCAPA::tempdir();
   if (tie(%hash,'GDBM_File',
 	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
 	  &GDBM_WRCREAT(),0640)) {
@@ -3454,7 +4681,7 @@ sub tmprestore {
   $namespace=~s/\//\_/g;
   $namespace=~s/\W//g;
   my %hash;
-  my $path=$perlvar{'lonDaemons'}.'/tmp';
+  my $path=LONCAPA::tempdir();
   if (tie(%hash,'GDBM_File',
 	  $path.'/tmpstore_'.$stuname.'_'.$domain.'_'.$namespace.'.db',
 	  &GDBM_READER(),0640)) {
@@ -3591,6 +4818,8 @@ sub restore {
 }
 
 # ---------------------------------------------------------- Course Description
+#
+#  
 
 sub coursedescription {
     my ($courseid,$args)=@_;
@@ -3620,7 +4849,8 @@ sub coursedescription {
 	return %returnhash;
     }
 
-    # get the data agin
+    # get the data again
+
     if (!$args->{'one_time'}) {
 	$envhash{'course.'.$normalid.'.last_cache'}=time;
     }
@@ -3628,6 +4858,10 @@ sub coursedescription {
     if ($chome ne 'no_host') {
        %returnhash=&dump('environment',$cdomain,$cnum);
        if (!exists($returnhash{'con_lost'})) {
+	   my $username = $env{'user.name'}; # Defult username
+	   if(defined $args->{'user'}) {
+	       $username = $args->{'user'};
+	   }
            $returnhash{'home'}= $chome;
 	   $returnhash{'domain'} = $cdomain;
 	   $returnhash{'num'} = $cnum;
@@ -3638,8 +4872,8 @@ sub coursedescription {
                $envhash{'course.'.$normalid.'.'.$name}=$value;
            }
            $returnhash{'url'}=&clutter($returnhash{'url'});
-           $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
-	       $env{'user.name'}.'_'.$cdomain.'_'.$cnum;
+           $returnhash{'fn'}=LONCAPA::tempdir() .
+	       $username.'_'.$cdomain.'_'.$cnum;
            $envhash{'course.'.$normalid.'.home'}=$chome;
            $envhash{'course.'.$normalid.'.domain'}=$cdomain;
            $envhash{'course.'.$normalid.'.num'}=$cnum;
@@ -3651,93 +4885,169 @@ sub coursedescription {
     return %returnhash;
 }
 
+sub update_released_required {
+    my ($needsrelease,$cdom,$cnum,$chome,$cid) = @_;
+    if ($cdom eq '' || $cnum eq '' || $chome eq '' || $cid eq '') {
+        $cid = $env{'request.course.id'};
+        $cdom = $env{'course.'.$cid.'.domain'};
+        $cnum = $env{'course.'.$cid.'.num'};
+        $chome = $env{'course.'.$cid.'.home'};
+    }
+    if ($needsrelease) {
+        my %curr_reqd_hash = &userenvironment($cdom,$cnum,'internal.releaserequired');
+        my $needsupdate;
+        if ($curr_reqd_hash{'internal.releaserequired'} eq '') {
+            $needsupdate = 1;
+        } else {
+            my ($currmajor,$currminor) = split(/\./,$curr_reqd_hash{'internal.releaserequired'});
+            my ($needsmajor,$needsminor) = split(/\./,$needsrelease);
+            if (($currmajor < $needsmajor) || ($currmajor == $needsmajor && $currminor < $needsminor)) {
+                $needsupdate = 1;
+            }
+        }
+        if ($needsupdate) {
+            my %needshash = (
+                             'internal.releaserequired' => $needsrelease,
+                            );
+            my $putresult = &put('environment',\%needshash,$cdom,$cnum);
+            if ($putresult eq 'ok') {
+                &appenv({'course.'.$cid.'.internal.releaserequired' => $needsrelease});
+                my %crsinfo = &courseiddump($cdom,'.',1,'.','.',$cnum,undef,undef,'.');
+                if (ref($crsinfo{$cid}) eq 'HASH') {
+                    $crsinfo{$cid}{'releaserequired'} = $needsrelease;
+                    &courseidput($cdom,\%crsinfo,$chome,'notime');
+                }
+            }
+        }
+    }
+    return;
+}
+
 # -------------------------------------------------See if a user is privileged
 
 sub privileged {
     my ($username,$domain)=@_;
-    my $rolesdump=&reply("dump:$domain:$username:roles",
-			&homeserver($username,$domain));
-    if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return 0; }
-    my $now=time;
-    if ($rolesdump ne '') {
-        foreach my $entry (split(/&/,$rolesdump)) {
-	    if ($entry!~/^rolesdef_/) {
-		my ($area,$role)=split(/=/,$entry);
-		$area=~s/\_\w\w$//;
-		my ($trole,$tend,$tstart)=split(/_/,$role);
-		if (($trole eq 'dc') || ($trole eq 'su')) {
-		    my $active=1;
-		    if ($tend) {
-			if ($tend<$now) { $active=0; }
-		    }
-		    if ($tstart) {
-			if ($tstart>$now) { $active=0; }
-		    }
-		    if ($active) { return 1; }
-		}
-	    }
+
+    my %rolesdump = &dump("roles", $domain, $username) or return 0;
+    my $now = time;
+
+    for my $role (@rolesdump{grep { ! /^rolesdef_/ } keys %rolesdump}) {
+            my ($trole, $tend, $tstart) = split(/_/, $role);
+            if (($trole eq 'dc') || ($trole eq 'su')) {
+                return 1 unless ($tend && $tend < $now) 
+                    or ($tstart && $tstart > $now);
+            }
 	}
-    }
+
     return 0;
 }
 
 # -------------------------------------------------------- Get user privileges
 
 sub rolesinit {
-    my ($domain,$username,$authhost)=@_;
-    my %userroles;
-    my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
-    if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return \%userroles; }
+    my ($domain, $username) = @_;
+    my %userroles = ('user.login.time' => time);
+    my %rolesdump = &dump("roles", $domain, $username) or return \%userroles;
+
+    # firstaccess and timerinterval are related to timed maps/resources. 
+    # also, blocking can be triggered by an activating timer
+    # it's saved in the user's %env.
+    my %firstaccess = &dump('firstaccesstimes', $domain, $username);
+    my %timerinterval = &dump('timerinterval', $domain, $username);
+    my (%coursetimerstarts, %firstaccchk, %firstaccenv, %coursetimerintervals,
+        %timerintchk, %timerintenv);
+
+    foreach my $key (keys(%firstaccess)) {
+        my ($cid, $rest) = split(/\0/, $key);
+        $coursetimerstarts{$cid}{$rest} = $firstaccess{$key};
+    }
+
+    foreach my $key (keys(%timerinterval)) {
+        my ($cid,$rest) = split(/\0/,$key);
+        $coursetimerintervals{$cid}{$rest} = $timerinterval{$key};
+    }
+
     my %allroles=();
-    my %allgroups=();   
-    my $now=time;
-    %userroles = ('user.login.time' => $now);
-    my $group_privs;
+    my %allgroups=();
 
-    if ($rolesdump ne '') {
-        foreach my $entry (split(/&/,$rolesdump)) {
-	  if ($entry!~/^rolesdef_/) {
-            my ($area,$role)=split(/=/,$entry);
-	    $area=~s/\_\w\w$//;
-            my ($trole,$tend,$tstart,$group_privs);
-	    if ($role=~/^cr/) { 
-		if ($role=~m|^(cr/$match_domain/$match_username/[a-zA-Z0-9]+)_(.*)$|) {
-		    ($trole,my $trest)=($role=~m|^(cr/$match_domain/$match_username/[a-zA-Z0-9]+)_(.*)$|);
-		    ($tend,$tstart)=split('_',$trest);
-		} else {
-		    $trole=$role;
-		}
-            } elsif ($role =~ m|^gr/|) {
-                ($trole,$tend,$tstart) = split(/_/,$role);
-                ($trole,$group_privs) = split(/\//,$trole);
-                $group_privs = &unescape($group_privs);
-	    } else {
-		($trole,$tend,$tstart)=split(/_/,$role);
-	    }
-	    my %new_role = &set_arearole($trole,$area,$tstart,$tend,$domain,
-					 $username);
-	    @userroles{keys(%new_role)} = @new_role{keys(%new_role)};
-            if (($tend!=0) && ($tend<$now)) { $trole=''; }
-            if (($tstart!=0) && ($tstart>$now)) { $trole=''; }
-            if (($area ne '') && ($trole ne '')) {
-		my $spec=$trole.'.'.$area;
-		my ($tdummy,$tdomain,$trest)=split(/\//,$area);
-		if ($trole =~ /^cr\//) {
-                    &custom_roleprivs(\%allroles,$trole,$tdomain,$trest,$spec,$area);
-                } elsif ($trole eq 'gr') {
-                    &group_roleprivs(\%allgroups,$area,$group_privs,$tend,$tstart);
-		} else {
-                    &standard_roleprivs(\%allroles,$trole,$tdomain,$spec,$trest,$area);
-		}
+    for my $area (grep { ! /^rolesdef_/ } keys %rolesdump) {
+        my $role = $rolesdump{$area};
+        $area =~ s/\_\w\w$//;
+
+        my ($trole, $tend, $tstart, $group_privs);
+
+        if ($role =~ /^cr/) {
+        # Custom role, defined by a user 
+        # e.g., user.role.cr/msu/smith/mynewrole
+            if ($role =~ m|^(cr/$match_domain/$match_username/[a-zA-Z0-9]+)_(.*)$|) {
+                $trole = $1;
+                ($tend, $tstart) = split('_', $2);
+            } else {
+                $trole = $role;
             }
-          }
+        } elsif ($role =~ m|^gr/|) {
+        # Role of member in a group, defined within a course/community
+        # e.g., user.role.gr/msu/04935610a19ee4a5fmsul1/leopards
+            ($trole, $tend, $tstart) = split(/_/, $role);
+            next if $tstart eq '-1';
+            ($trole, $group_privs) = split(/\//, $trole);
+            $group_privs = &unescape($group_privs);
+        } else {
+        # Just a normal role, defined in roles.tab
+            ($trole, $tend, $tstart) = split(/_/,$role);
+        }
+
+        my %new_role = &set_arearole($trole,$area,$tstart,$tend,$domain,
+                 $username);
+        @userroles{keys(%new_role)} = @new_role{keys(%new_role)};
+
+        # role expired or not available yet?
+        $trole = '' if ($tend != 0 && $tend < $userroles{'user.login.time'}) or 
+            ($tstart != 0 && $tstart > $userroles{'user.login.time'});
+
+        next if $area eq '' or $trole eq '';
+
+        my $spec = "$trole.$area";
+        my ($tdummy, $tdomain, $trest) = split(/\//, $area);
+
+        if ($trole =~ /^cr\//) {
+        # Custom role, defined by a user
+            &custom_roleprivs(\%allroles,$trole,$tdomain,$trest,$spec,$area);
+        } elsif ($trole eq 'gr') {
+        # Role of a member in a group, defined within a course/community
+            &group_roleprivs(\%allgroups,$area,$group_privs,$tend,$tstart);
+            next;
+        } else {
+        # Normal role, defined in roles.tab
+            &standard_roleprivs(\%allroles,$trole,$tdomain,$spec,$trest,$area);
+        }
+
+        my $cid = $tdomain.'_'.$trest;
+        unless ($firstaccchk{$cid}) {
+            if (ref($coursetimerstarts{$cid}) eq 'HASH') {
+                foreach my $item (keys(%{$coursetimerstarts{$cid}})) {
+                    $firstaccenv{'course.'.$cid.'.firstaccess.'.$item} = 
+                        $coursetimerstarts{$cid}{$item}; 
+                }
+            }
+            $firstaccchk{$cid} = 1;
+        }
+        unless ($timerintchk{$cid}) {
+            if (ref($coursetimerintervals{$cid}) eq 'HASH') {
+                foreach my $item (keys(%{$coursetimerintervals{$cid}})) {
+                    $timerintenv{'course.'.$cid.'.timerinterval.'.$item} =
+                       $coursetimerintervals{$cid}{$item};
+                }
+            }
+            $timerintchk{$cid} = 1;
         }
-        my ($author,$adv) = &set_userprivs(\%userroles,\%allroles,\%allgroups);
-        $userroles{'user.adv'}    = $adv;
-	$userroles{'user.author'} = $author;
-        $env{'user.adv'}=$adv;
     }
-    return \%userroles;  
+
+    @userroles{'user.author', 'user.adv'} = &set_userprivs(\%userroles,
+        \%allroles, \%allgroups);
+    $env{'user.adv'} = $userroles{'user.adv'};
+
+    return (\%userroles,\%firstaccenv,\%timerintenv);
 }
 
 sub set_arearole {
@@ -3757,6 +5067,9 @@ sub custom_roleprivs {
         if (($rdummy ne 'con_lost') && ($roledef ne '')) {
             my ($syspriv,$dompriv,$coursepriv)=split(/\_/,$roledef);
             if (defined($syspriv)) {
+                if ($trest =~ /^$match_community$/) {
+                    $syspriv =~ s/bre\&S//; 
+                }
                 $$allroles{'cm./'}.=':'.$syspriv;
                 $$allroles{$spec.'./'}.=':'.$syspriv;
             }
@@ -3805,23 +5118,36 @@ sub standard_roleprivs {
 }
 
 sub set_userprivs {
-    my ($userroles,$allroles,$allgroups) = @_; 
+    my ($userroles,$allroles,$allgroups,$groups_roles) = @_; 
     my $author=0;
     my $adv=0;
     my %grouproles = ();
     if (keys(%{$allgroups}) > 0) {
-        foreach my $role (keys %{$allroles}) {
-            my ($trole,$area,$sec,$extendedarea);
-            if ($role =~ m-^(\w+|cr/$match_domain/$match_username/\w+)\.(/$match_domain/$match_courseid)(/?\w*)\.-) {
-                $trole = $1;
-                $area = $2;
-                $sec = $3;
-                $extendedarea = $area.$sec;
-                if (exists($$allgroups{$area})) {
-                    foreach my $group (keys(%{$$allgroups{$area}})) {
-                        my $spec = $trole.'.'.$extendedarea;
-                        $grouproles{$spec.'.'.$area.'/'.$group} = 
+        my @groupkeys; 
+        foreach my $role (keys(%{$allroles})) {
+            push(@groupkeys,$role);
+        }
+        if (ref($groups_roles) eq 'HASH') {
+            foreach my $key (keys(%{$groups_roles})) {
+                unless (grep(/^\Q$key\E$/,@groupkeys)) {
+                    push(@groupkeys,$key);
+                }
+            }
+        }
+        if (@groupkeys > 0) {
+            foreach my $role (@groupkeys) {
+                my ($trole,$area,$sec,$extendedarea);
+                if ($role =~ m-^(\w+|cr/$match_domain/$match_username/\w+)\.(/$match_domain/$match_courseid)(/?\w*)\.-) {
+                    $trole = $1;
+                    $area = $2;
+                    $sec = $3;
+                    $extendedarea = $area.$sec;
+                    if (exists($$allgroups{$area})) {
+                        foreach my $group (keys(%{$$allgroups{$area}})) {
+                            my $spec = $trole.'.'.$extendedarea;
+                            $grouproles{$spec.'.'.$area.'/'.$group} = 
                                                 $$allgroups{$area}{$group};
+                        }
                     }
                 }
             }
@@ -3845,7 +5171,7 @@ sub set_userprivs {
             }
         }
         my $thesestr='';
-        foreach my $priv (keys(%thesepriv)) {
+        foreach my $priv (sort(keys(%thesepriv))) {
 	    $thesestr.=':'.$priv.'&'.$thesepriv{$priv};
 	}
         $userroles->{'user.priv.'.$role} = $thesestr;
@@ -3853,6 +5179,167 @@ sub set_userprivs {
     return ($author,$adv);
 }
 
+sub role_status {
+    my ($rolekey,$update,$refresh,$now,$role,$where,$trolecode,$tstatus,$tstart,$tend) = @_;
+    my @pwhere = ();
+    if (exists($env{$rolekey}) && $env{$rolekey} ne '') {
+        (undef,undef,$$role,@pwhere)=split(/\./,$rolekey);
+        unless (!defined($$role) || $$role eq '') {
+            $$where=join('.',@pwhere);
+            $$trolecode=$$role.'.'.$$where;
+            ($$tstart,$$tend)=split(/\./,$env{$rolekey});
+            $$tstatus='is';
+            if ($$tstart && $$tstart>$update) {
+                $$tstatus='future';
+                if ($$tstart<$now) {
+                    if ($$tstart && $$tstart>$refresh) {
+                        if (($$where ne '') && ($$role ne '')) {
+                            my (%allroles,%allgroups,$group_privs,
+                                %groups_roles,@rolecodes);
+                            my %userroles = (
+                                'user.role.'.$$role.'.'.$$where => $$tstart.'.'.$$tend
+                            );
+                            @rolecodes = ('cm'); 
+                            my $spec=$$role.'.'.$$where;
+                            my ($tdummy,$tdomain,$trest)=split(/\//,$$where);
+                            if ($$role =~ /^cr\//) {
+                                &custom_roleprivs(\%allroles,$$role,$tdomain,$trest,$spec,$$where);
+                                push(@rolecodes,'cr');
+                            } elsif ($$role eq 'gr') {
+                                push(@rolecodes,$$role);
+                                my %rolehash = &get('roles',[$$where.'_'.$$role],$env{'user.domain'},
+                                                    $env{'user.name'});
+                                my ($trole) = split('_',$rolehash{$$where.'_'.$$role},2);
+                                (undef,my $group_privs) = split(/\//,$trole);
+                                $group_privs = &unescape($group_privs);
+                                &group_roleprivs(\%allgroups,$$where,$group_privs,$$tend,$$tstart);
+                                my %course_roles = &get_my_roles($env{'user.name'},$env{'user.domain'},'userroles',['active'],['cc','co','in','ta','ep','ad','st','cr'],[$tdomain],1);
+                                &get_groups_roles($tdomain,$trest,
+                                                  \%course_roles,\@rolecodes,
+                                                  \%groups_roles);
+                            } else {
+                                push(@rolecodes,$$role);
+                                &standard_roleprivs(\%allroles,$$role,$tdomain,$spec,$trest,$$where);
+                            }
+                            my ($author,$adv)= &set_userprivs(\%userroles,\%allroles,\%allgroups,\%groups_roles);
+                            &appenv(\%userroles,\@rolecodes);
+                            &log($env{'user.domain'},$env{'user.name'},$env{'user.home'},"Role ".$role);
+                        }
+                    }
+                    $$tstatus = 'is';
+                }
+            }
+            if ($$tend) {
+                if ($$tend<$update) {
+                    $$tstatus='expired';
+                } elsif ($$tend<$now) {
+                    $$tstatus='will_not';
+                }
+            }
+        }
+    }
+}
+
+sub get_groups_roles {
+    my ($cdom,$rest,$cdom_courseroles,$rolecodes,$groups_roles) = @_;
+    return unless((ref($cdom_courseroles) eq 'HASH') && 
+                  (ref($rolecodes) eq 'ARRAY') && 
+                  (ref($groups_roles) eq 'HASH')); 
+    if (keys(%{$cdom_courseroles}) > 0) {
+        my ($cnum) = ($rest =~ /^($match_courseid)/);
+        if ($cdom ne '' && $cnum ne '') {
+            foreach my $key (keys(%{$cdom_courseroles})) {
+                if ($key =~ /^\Q$cnum\E:\Q$cdom\E:([^:]+):?([^:]*)/) {
+                    my $crsrole = $1;
+                    my $crssec = $2;
+                    if ($crsrole =~ /^cr/) {
+                        unless (grep(/^cr$/,@{$rolecodes})) {
+                            push(@{$rolecodes},'cr');
+                        }
+                    } else {
+                        unless(grep(/^\Q$crsrole\E$/,@{$rolecodes})) {
+                            push(@{$rolecodes},$crsrole);
+                        }
+                    }
+                    my $rolekey = "$crsrole./$cdom/$cnum";
+                    if ($crssec ne '') {
+                        $rolekey .= "/$crssec";
+                    }
+                    $rolekey .= './';
+                    $groups_roles->{$rolekey} = $rolecodes;
+                }
+            }
+        }
+    }
+    return;
+}
+
+sub delete_env_groupprivs {
+    my ($where,$courseroles,$possroles) = @_;
+    return unless((ref($courseroles) eq 'HASH') && (ref($possroles) eq 'ARRAY'));
+    my ($dummy,$udom,$uname,$group) = split(/\//,$where);
+    unless (ref($courseroles->{$udom}) eq 'HASH') {
+        %{$courseroles->{$udom}} =
+            &get_my_roles('','','userroles',['active'],
+                          $possroles,[$udom],1);
+    }
+    if (ref($courseroles->{$udom}) eq 'HASH') {
+        foreach my $item (keys(%{$courseroles->{$udom}})) {
+            my ($cnum,$cdom,$crsrole,$crssec) = split(/:/,$item);
+            my $area = '/'.$cdom.'/'.$cnum;
+            my $privkey = "user.priv.$crsrole.$area";
+            if ($crssec ne '') {
+                $privkey .= '/'.$crssec;
+            }
+            $privkey .= ".$area/$group";
+            &Apache::lonnet::delenv($privkey,undef,[$crsrole]);
+        }
+    }
+    return;
+}
+
+sub check_adhoc_privs {
+    my ($cdom,$cnum,$update,$refresh,$now,$checkrole,$caller) = @_;
+    my $cckey = 'user.role.'.$checkrole.'./'.$cdom.'/'.$cnum;
+    my $setprivs;
+    if ($env{$cckey}) {
+        my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus,$tpstart,$tpend);
+        &role_status($cckey,$update,$refresh,$now,\$role,\$where,\$trolecode,\$tstatus,\$tstart,\$tend);
+        unless (($tstatus eq 'is') || ($tstatus eq 'will_not')) {
+            &set_adhoc_privileges($cdom,$cnum,$checkrole,$caller);
+            $setprivs = 1;
+        }
+    } else {
+        &set_adhoc_privileges($cdom,$cnum,$checkrole,$caller);
+        $setprivs = 1;
+    }
+    return $setprivs;
+}
+
+sub set_adhoc_privileges {
+# role can be cc or ca
+    my ($dcdom,$pickedcourse,$role,$caller) = @_;
+    my $area = '/'.$dcdom.'/'.$pickedcourse;
+    my $spec = $role.'.'.$area;
+    my %userroles = &set_arearole($role,$area,'','',$env{'user.domain'},
+                                  $env{'user.name'});
+    my %ccrole = ();
+    &standard_roleprivs(\%ccrole,$role,$dcdom,$spec,$pickedcourse,$area);
+    my ($author,$adv)= &set_userprivs(\%userroles,\%ccrole);
+    &appenv(\%userroles,[$role,'cm']);
+    &log($env{'user.domain'},$env{'user.name'},$env{'user.home'},"Role ".$role);
+    unless ($caller eq 'constructaccess' && $env{'request.course.id'}) {
+        &appenv( {'request.role'        => $spec,
+                  'request.role.domain' => $dcdom,
+                  'request.course.sec'  => ''
+                 }
+               );
+        my $tadv=0;
+        if (&allowed('adv') eq 'F') { $tadv=1; }
+        &appenv({'request.role.adv'    => $tadv});
+    }
+}
+
 # --------------------------------------------------------------- get interface
 
 sub get {
@@ -3898,11 +5385,37 @@ sub del {
 
 # -------------------------------------------------------------- dump interface
 
+sub unserialize {
+    my ($rep, $escapedkeys) = @_;
+
+    return {} if $rep =~ /^error/;
+
+    my %returnhash=();
+	foreach my $item (split /\&/, $rep) {
+	    my ($key, $value) = split(/=/, $item, 2);
+	    $key = unescape($key) unless $escapedkeys;
+	    next if $key =~ /^error: 2 /;
+	    $returnhash{$key} = Apache::lonnet::thaw_unescape($value);
+	}
+    #return %returnhash;
+    return \%returnhash;
+}        
+
+# see Lond::dump_with_regexp
+# if $escapedkeys hash keys won't get unescaped.
 sub dump {
-    my ($namespace,$udomain,$uname,$regexp,$range)=@_;
+    my ($namespace,$udomain,$uname,$regexp,$range,$escapedkeys)=@_;
     if (!$udomain) { $udomain=$env{'user.domain'}; }
     if (!$uname) { $uname=$env{'user.name'}; }
     my $uhome=&homeserver($uname,$udomain);
+
+    my $reply;
+    if (grep { $_ eq $uhome } current_machine_ids()) {
+        # user is hosted on this machine
+        $reply = LONCAPA::Lond::dump_with_regexp(join(":", ($udomain,
+                    $uname, $namespace, $regexp, $range)), $loncaparevs{$uhome});
+        return %{unserialize($reply, $escapedkeys)};
+    }
     if ($regexp) {
 	$regexp=&escape($regexp);
     } else {
@@ -3911,36 +5424,26 @@ sub dump {
     my $rep=&reply("dump:$udomain:$uname:$namespace:$regexp:$range",$uhome);
     my @pairs=split(/\&/,$rep);
     my %returnhash=();
-    foreach my $item (@pairs) {
-	my ($key,$value)=split(/=/,$item,2);
-	$key = &unescape($key);
-	next if ($key =~ /^error: 2 /);
-	$returnhash{$key}=&thaw_unescape($value);
+    if (!($rep =~ /^error/ )) {
+	foreach my $item (@pairs) {
+	    my ($key,$value)=split(/=/,$item,2);
+        $key = unescape($key) unless $escapedkeys;
+        #$key = &unescape($key);
+	    next if ($key =~ /^error: 2 /);
+	    $returnhash{$key}=&thaw_unescape($value);
+	}
     }
     return %returnhash;
 }
 
+
 # --------------------------------------------------------- dumpstore interface
 
 sub dumpstore {
    my ($namespace,$udomain,$uname,$regexp,$range)=@_;
-   if (!$udomain) { $udomain=$env{'user.domain'}; }
-   if (!$uname) { $uname=$env{'user.name'}; }
-   my $uhome=&homeserver($uname,$udomain);
-   if ($regexp) {
-       $regexp=&escape($regexp);
-   } else {
-       $regexp='.';
-   }
-   my $rep=&reply("dump:$udomain:$uname:$namespace:$regexp:$range",$uhome);
-   my @pairs=split(/\&/,$rep);
-   my %returnhash=();
-   foreach my $item (@pairs) {
-       my ($key,$value)=split(/=/,$item,2);
-       next if ($key =~ /^error: 2 /);
-       $returnhash{$key}=&thaw_unescape($value);
-   }
-   return %returnhash;
+   # same as dump but keys must be escaped. They may contain colon separated
+   # lists of values that may themself contain colons (e.g. symbs).
+   return &dump($namespace, $udomain, $uname, $regexp, $range, 1);
 }
 
 # -------------------------------------------------------------- keys interface
@@ -3966,7 +5469,15 @@ sub currentdump {
    $sdom     = $env{'user.domain'}       if (! defined($sdom));
    $sname    = $env{'user.name'}         if (! defined($sname));
    my $uhome = &homeserver($sname,$sdom);
-   my $rep=reply('currentdump:'.$sdom.':'.$sname.':'.$courseid,$uhome);
+   my $rep;
+
+   if (grep { $_ eq $uhome } current_machine_ids()) {
+       $rep = LONCAPA::Lond::dump_profile_database(join(":", ($sdom, $sname, 
+                   $courseid)));
+   } else {
+       $rep = reply('currentdump:'.$sdom.':'.$sname.':'.$courseid,$uhome);
+   }
+
    return if ($rep =~ /^(error:|no_such_host)/);
    #
    my %returnhash=();
@@ -4202,13 +5713,95 @@ sub tmpget {
     return %returnhash;
 }
 
-# ------------------------------------------------------------ tmpget interface
+# ------------------------------------------------------------ tmpdel interface
 sub tmpdel {
     my ($token,$server)=@_;
     if (!defined($server)) { $server = $perlvar{'lonHostID'}; }
     return &reply("tmpdel:$token",$server);
 }
 
+# ------------------------------------------------------------ get_timebased_id 
+
+sub get_timebased_id {
+    my ($prefix,$keyid,$namespace,$cdom,$cnum,$idtype,$who,$locktries,
+        $maxtries) = @_;
+    my ($newid,$error,$dellock);
+    unless (($prefix =~ /^\w+$/) && ($keyid =~ /^\w+$/) && ($namespace ne '')) {  
+        return ('','ok','invalid call to get suffix');
+    }
+
+# set defaults for any optional args for which values were not supplied
+    if ($who eq '') {
+        $who = $env{'user.name'}.':'.$env{'user.domain'};
+    }
+    if (!$locktries) {
+        $locktries = 3;
+    }
+    if (!$maxtries) {
+        $maxtries = 10;
+    }
+    
+    if (($cdom eq '') || ($cnum eq '')) {
+        if ($env{'request.course.id'}) {
+            $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+            $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+        }
+        if (($cdom eq '') || ($cnum eq '')) {
+            return ('','ok','call to get suffix not in course context');
+        }
+    }
+
+# construct locking item
+    my $lockhash = {
+                      $prefix."\0".'locked_'.$keyid => $who,
+                   };
+    my $tries = 0;
+
+# attempt to get lock on nohist_$namespace file
+    my $gotlock = &Apache::lonnet::newput('nohist_'.$namespace,$lockhash,$cdom,$cnum);
+    while (($gotlock ne 'ok') && $tries <$locktries) {
+        $tries ++;
+        sleep 1;
+        $gotlock = &Apache::lonnet::newput('nohist_'.$namespace,$lockhash,$cdom,$cnum);
+    }
+
+# attempt to get unique identifier, based on current timestamp
+    if ($gotlock eq 'ok') {
+        my %inuse = &Apache::lonnet::dump('nohist_'.$namespace,$cdom,$cnum,$prefix);
+        my $id = time;
+        $newid = $id;
+        my $idtries = 0;
+        while (exists($inuse{$prefix."\0".$newid}) && $idtries < $maxtries) {
+            if ($idtype eq 'concat') {
+                $newid = $id.$idtries;
+            } else {
+                $newid ++;
+            }
+            $idtries ++;
+        }
+        if (!exists($inuse{$prefix."\0".$newid})) {
+            my %new_item =  (
+                              $prefix."\0".$newid => $who,
+                            );
+            my $putresult = &Apache::lonnet::put('nohist_'.$namespace,\%new_item,
+                                                 $cdom,$cnum);
+            if ($putresult ne 'ok') {
+                undef($newid);
+                $error = 'error saving new item: '.$putresult;
+            }
+        } else {
+             $error = ('error: no unique suffix available for the new item ');
+        }
+#  remove lock
+        my @del_lock = ($prefix."\0".'locked_'.$keyid);
+        $dellock = &Apache::lonnet::del('nohist_'.$namespace,\@del_lock,$cdom,$cnum);
+    } else {
+        $error = "error: could not obtain lockfile\n";
+        $dellock = 'ok';
+    }
+    return ($newid,$dellock,$error);
+}
+
 # -------------------------------------------------- portfolio access checking
 
 sub portfolio_access {
@@ -4313,7 +5906,7 @@ sub get_portfolio_access {
                 my (%allgroups,%allroles); 
                 my ($start,$end,$role,$sec,$group);
                 foreach my $envkey (%env) {
-                    if ($envkey =~ m-^user\.role\.(gr|cc|in|ta|ep|st)\./($match_domain)/($match_courseid)/?([^/]*)$-) {
+                    if ($envkey =~ m-^user\.role\.(gr|cc|co|in|ta|ep|ad|st)\./($match_domain)/($match_courseid)/?([^/]*)$-) {
                         my $cid = $2.'_'.$3; 
                         if ($1 eq 'gr') {
                             $group = $4;
@@ -4453,7 +6046,7 @@ sub is_portfolio_file {
 }
 
 sub usertools_access {
-    my ($uname,$udom,$tool,$action,$context) = @_;
+    my ($uname,$udom,$tool,$action,$context,$userenvref,$domdefref,$is_advref)=@_;
     my ($access,%tools);
     if ($context eq '') {
         $context = 'tools';
@@ -4462,11 +6055,17 @@ sub usertools_access {
         %tools = (
                       official   => 1,
                       unofficial => 1,
+                      community  => 1,
+                 );
+    } elsif ($context eq 'requestauthor') {
+        %tools = (
+                      requestauthor => 1,
                  );
     } else {
         %tools = (
                       aboutme   => 1,
                       blog      => 1,
+                      webdav    => 1,
                       portfolio => 1,
                  );
     }
@@ -4481,22 +6080,34 @@ sub usertools_access {
         if ($action ne 'reload') {
             if ($context eq 'requestcourses') {
                 return $env{'environment.canrequest.'.$tool};
+            } elsif ($context eq 'requestauthor') {
+                return $env{'environment.canrequest.author'};
             } else {
                 return $env{'environment.availabletools.'.$tool};
             }
         }
     }
 
-    my ($toolstatus,$inststatus);
+    my ($toolstatus,$inststatus,$envkey);
+    if ($context eq 'requestauthor') {
+        $envkey = $context; 
+    } else {
+        $envkey = $context.'.'.$tool;
+    }
 
     if (($udom eq $env{'user.domain'}) && ($uname eq $env{'user.name'}) &&
          ($action ne 'reload')) {
-        $toolstatus = $env{'environment.'.$context.'.'.$tool};
+        $toolstatus = $env{'environment.'.$envkey};
         $inststatus = $env{'environment.inststatus'};
     } else {
-        my %userenv = &userenvironment($udom,$uname,$context.'.'.$tool);
-        $toolstatus = $userenv{$context.'.'.$tool};
-        $inststatus = $userenv{'inststatus'};
+        if (ref($userenvref) eq 'HASH') {
+            $toolstatus = $userenvref->{$envkey};
+            $inststatus = $userenvref->{'inststatus'};
+        } else {
+            my %userenv = &userenvironment($udom,$uname,$envkey,'inststatus');
+            $toolstatus = $userenv{$envkey};
+            $inststatus = $userenv{'inststatus'};
+        }
     }
 
     if ($toolstatus ne '') {
@@ -4508,8 +6119,17 @@ sub usertools_access {
         return $access;
     }
 
-    my $is_adv = &is_advanced_user($udom,$uname);
-    my %domdef = &get_domain_defaults($udom);
+    my ($is_adv,%domdef);
+    if (ref($is_advref) eq 'HASH') {
+        $is_adv = $is_advref->{'is_adv'};
+    } else {
+        $is_adv = &is_advanced_user($udom,$uname);
+    }
+    if (ref($domdefref) eq 'HASH') {
+        %domdef = %{$domdefref};
+    } else {
+        %domdef = &get_domain_defaults($udom);
+    }
     if (ref($domdef{$tool}) eq 'HASH') {
         if ($is_adv) {
             if ($domdef{$tool}{'_LC_adv'} ne '') {
@@ -4551,7 +6171,7 @@ sub usertools_access {
             }
         }
     } else {
-        if ($context eq 'tools') {
+        if (($context eq 'tools') && ($tool ne 'webdav')) {
             $access = 1;
         } else {
             $access = 0;
@@ -4560,11 +6180,41 @@ sub usertools_access {
     }
 }
 
+sub is_course_owner {
+    my ($cdom,$cnum,$udom,$uname) = @_;
+    if (($udom eq '') || ($uname eq '')) {
+        $udom = $env{'user.domain'};
+        $uname = $env{'user.name'};
+    }
+    unless (($udom eq '') || ($uname eq '')) {
+        if (exists($env{'course.'.$cdom.'_'.$cnum.'.internal.courseowner'})) {
+            if ($env{'course.'.$cdom.'_'.$cnum.'.internal.courseowner'} eq $uname.':'.$udom) {
+                return 1;
+            } else {
+                my %courseinfo = &Apache::lonnet::coursedescription($cdom.'/'.$cnum);
+                if ($courseinfo{'internal.courseowner'} eq $uname.':'.$udom) {
+                    return 1;
+                }
+            }
+        }
+    }
+    return;
+}
+
 sub is_advanced_user {
     my ($udom,$uname) = @_;
+    if ($udom ne '' && $uname ne '') {
+        if (($udom eq $env{'user.domain'}) && ($uname eq $env{'user.name'})) {
+            if (wantarray) {
+                return ($env{'user.adv'},$env{'user.author'});
+            } else {
+                return $env{'user.adv'};
+            }
+        }
+    }
     my %roleshash = &get_my_roles($uname,$udom,'userroles',undef,undef,undef,1);
     my %allroles;
-    my $is_adv;
+    my ($is_adv,$is_author);
     foreach my $role (keys(%roleshash)) {
         my ($trest,$tdomain,$trole,$sec) = split(/:/,$role);
         my $area = '/'.$tdomain.'/'.$trest;
@@ -4578,6 +6228,9 @@ sub is_advanced_user {
             } elsif ($trole ne 'gr') {
                 &standard_roleprivs(\%allroles,$trole,$tdomain,$spec,$trest,$area);
             }
+            if ($trole eq 'au') {
+                $is_author = 1;
+            }
         }
     }
     foreach my $role (keys(%allroles)) {
@@ -4592,9 +6245,61 @@ sub is_advanced_user {
             }
         }
     }
+    if (wantarray) {
+        return ($is_adv,$is_author);
+    }
     return $is_adv;
 }
 
+sub check_can_request {
+    my ($dom,$can_request,$request_domains) = @_;
+    my $canreq = 0;
+    my ($types,$typename) = &Apache::loncommon::course_types();
+    my @options = ('approval','validate','autolimit');
+    my $optregex = join('|',@options);
+    if ((ref($can_request) eq 'HASH') && (ref($types) eq 'ARRAY')) {
+        foreach my $type (@{$types}) {
+            if (&usertools_access($env{'user.name'},
+                                  $env{'user.domain'},
+                                  $type,undef,'requestcourses')) {
+                $canreq ++;
+                if (ref($request_domains) eq 'HASH') {
+                    push(@{$request_domains->{$type}},$env{'user.domain'});
+                }
+                if ($dom eq $env{'user.domain'}) {
+                    $can_request->{$type} = 1;
+                }
+            }
+            if ($env{'environment.reqcrsotherdom.'.$type} ne '') {
+                my @curr = split(',',$env{'environment.reqcrsotherdom.'.$type});
+                if (@curr > 0) {
+                    foreach my $item (@curr) {
+                        if (ref($request_domains) eq 'HASH') {
+                            my ($otherdom) = ($item =~ /^($match_domain):($optregex)(=?\d*)$/);
+                            if ($otherdom ne '') {
+                                if (ref($request_domains->{$type}) eq 'ARRAY') {
+                                    unless (grep(/^\Q$otherdom\E$/,@{$request_domains->{$type}})) {
+                                        push(@{$request_domains->{$type}},$otherdom);
+                                    }
+                                } else {
+                                    push(@{$request_domains->{$type}},$otherdom);
+                                }
+                            }
+                        }
+                    }
+                    unless($dom eq $env{'user.domain'}) {
+                        $canreq ++;
+                        if (grep(/^\Q$dom\E:($optregex)(=?\d*)$/,@curr)) {
+                            $can_request->{$type} = 1;
+                        }
+                    }
+                }
+            }
+        }
+    }
+    return $canreq;
+}
+
 # ---------------------------------------------- Custom access rule evaluation
 
 sub customaccess {
@@ -4749,17 +6454,77 @@ sub allowed {
     my $statecond=0;
     my $courseprivid='';
 
+    my $ownaccess;
+    # Community Coordinator or Assistant Co-author browsing resource space.
+    if (($priv eq 'bro') && ($env{'user.author'})) {
+        if ($uri eq '') {
+            $ownaccess = 1;
+        } else {
+            if (($env{'user.domain'} ne '') && ($env{'user.name'} ne '')) {
+                my $udom = $env{'user.domain'};
+                my $uname = $env{'user.name'};
+                if ($uri =~ m{^\Q$udom\E/?$}) {
+                    $ownaccess = 1;
+                } elsif ($uri =~ m{^\Q$udom\E/\Q$uname\E/?}) {
+                    unless ($uri =~ m{\.\./}) {
+                        $ownaccess = 1;
+                    }
+                } elsif (($udom ne 'public') && ($uname ne 'public')) {
+                    my $now = time;
+                    if ($uri =~ m{^([^/]+)/?$}) {
+                        my $adom = $1;
+                        foreach my $key (keys(%env)) {
+                            if ($key =~ m{^user\.role\.(ca|aa)/\Q$adom\E}) {
+                                my ($start,$end) = split('.',$env{$key});
+                                if (($now >= $start) && (!$end || $end < $now)) {
+                                    $ownaccess = 1;
+                                    last;
+                                }
+                            }
+                        }
+                    } elsif ($uri =~ m{^([^/]+)/([^/]+)/?}) {
+                        my $adom = $1;
+                        my $aname = $2;
+                        foreach my $role ('ca','aa') { 
+                            if ($env{"user.role.$role./$adom/$aname"}) {
+                                my ($start,$end) =
+                                    split('.',$env{"user.role.$role./$adom/$aname"});
+                                if (($now >= $start) && (!$end || $end < $now)) {
+                                    $ownaccess = 1;
+                                    last;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
 # Course
 
     if ($env{'user.priv.'.$env{'request.role'}.'./'}=~/\Q$priv\E\&([^\:]*)/) {
-       $thisallowed.=$1;
+        unless (($priv eq 'bro') && (!$ownaccess)) {
+            $thisallowed.=$1;
+        }
     }
 
 # Domain
 
     if ($env{'user.priv.'.$env{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
        =~/\Q$priv\E\&([^\:]*)/) {
-       $thisallowed.=$1;
+        unless (($priv eq 'bro') && (!$ownaccess)) {
+            $thisallowed.=$1;
+        }
+    }
+
+# User who is not author or co-author might still be able to edit
+# resource of an author in the domain (e.g., if Domain Coordinator).
+    if (($priv eq 'eco') && ($thisallowed eq '') && ($env{'request.course.id'}) &&
+        (&allowed('mdc',$env{'request.course.id'}))) {
+        if ($env{"user.priv.cm./$uri/"}=~/\Q$priv\E\&([^\:]*)/) {
+            $thisallowed.=$1;
+        }
     }
 
 # Course: uri itself is a course
@@ -4769,7 +6534,9 @@ sub allowed {
 
     if ($env{'user.priv.'.$env{'request.role'}.'.'.$courseuri}
        =~/\Q$priv\E\&([^\:]*)/) {
-       $thisallowed.=$1;
+        unless (($priv eq 'bro') && (!$ownaccess)) {
+            $thisallowed.=$1;
+        }
     }
 
 # URI is an uploaded document for this course, default permissions don't matter
@@ -4780,7 +6547,12 @@ sub allowed {
         if ($match) {
             if ($env{'user.priv.'.$env{'request.role'}.'./'}
                   =~/\Q$priv\E\&([^\:]*)/) {
-                $thisallowed.=$1;
+                my @blockers = &has_comm_blocking($priv,$symb,$uri);
+                if (@blockers > 0) {
+                    $thisallowed = 'B';
+                } else {
+                    $thisallowed.=$1;
+                }
             }
         } else {
             my $refuri = $env{'httpref.'.$orguri} || $env{'httpref.'.$ver_orguri};
@@ -4791,7 +6563,12 @@ sub allowed {
                     $refuri=&declutter($refuri);
                     my ($match) = &is_on_map($refuri);
                     if ($match) {
-                        $thisallowed='F';
+                        my @blockers = &has_comm_blocking($priv,$symb,$refuri);
+                        if (@blockers > 0) {
+                            $thisallowed = 'B';
+                        } else {
+                            $thisallowed='F';
+                        }
                     }
                 }
             }
@@ -4843,7 +6620,17 @@ sub allowed {
            $statecond=$cond;
            if ($env{'user.priv.'.$env{'request.role'}.'./'.$courseprivid}
                =~/\Q$priv\E\&([^\:]*)/) {
-               $thisallowed.=$1;
+               my $value = $1;
+               if ($priv eq 'bre') {
+                   my @blockers = &has_comm_blocking($priv,$symb,$uri);
+                   if (@blockers > 0) {
+                       $thisallowed = 'B';
+                   } else {
+                       $thisallowed.=$value;
+                   }
+               } else {
+                   $thisallowed.=$value;
+               }
                $checkreferer=0;
            }
        }
@@ -4871,7 +6658,17 @@ sub allowed {
               my $refstatecond=$cond;
               if ($env{'user.priv.'.$env{'request.role'}.'./'.$courseprivid}
                   =~/\Q$priv\E\&([^\:]*)/) {
-                  $thisallowed.=$1;
+                  my $value = $1;
+                  if ($priv eq 'bre') {
+                      my @blockers = &has_comm_blocking($priv,$symb,$refuri);
+                      if (@blockers > 0) {
+                          $thisallowed = 'B';
+                      } else {
+                          $thisallowed.=$value;
+                      }
+                  } else {
+                      $thisallowed.=$value;
+                  }
                   $uri=$refuri;
                   $statecond=$refstatecond;
               }
@@ -4909,7 +6706,7 @@ sub allowed {
 
     my $envkey;
     if ($thisallowed=~/L/) {
-        foreach $envkey (keys %env) {
+        foreach $envkey (keys(%env)) {
            if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
                my $courseid=$2;
                my $roleid=$1.'.'.$2;
@@ -4975,7 +6772,7 @@ sub allowed {
        my $unamedom=$env{'user.name'}.':'.$env{'user.domain'};
        if ($env{'course.'.$env{'request.course.id'}.'.'.$priv.'.roles.denied'}
 	   =~/\Q$rolecode\E/) {
-	   if ($priv ne 'pch') { 
+	   if (($priv ne 'pch') && ($priv ne 'plc')) { 
 	       &logthis($env{'user.domain'}.':'.$env{'user.name'}.':'.$env{'user.home'}.':'.
 			'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
 			$env{'request.course.id'});
@@ -4985,7 +6782,7 @@ sub allowed {
 
        if ($env{'course.'.$env{'request.course.id'}.'.'.$priv.'.users.denied'}
 	   =~/\Q$unamedom\E/) {
-	   if ($priv ne 'pch') { 
+	   if (($priv ne 'pch') && ($priv ne 'plc')) { 
 	       &logthis($env{'user.domain'}.':'.$env{'user.name'}.':'.$env{'user.home'}.
 			'Denied by user: '.$priv.' for '.$uri.' as '.$unamedom.' in '.
 			$env{'request.course.id'});
@@ -4999,7 +6796,7 @@ sub allowed {
    if ($thisallowed=~/R/) {
        my $rolecode=(split(/\./,$env{'request.role'}))[0];
        if (&metadata($uri,'roledeny')=~/\Q$rolecode\E/) {
-	   if ($priv ne 'pch') { 
+	   if (($priv ne 'pch') && ($priv ne 'plc')) { 
 	       &logthis($env{'user.domain'}.':'.$env{'user.name'}.':'.$env{'user.home'}.':'.
 			'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
 	   }
@@ -5031,6 +6828,251 @@ sub allowed {
    return 'F';
 }
 
+# ------------------------------------------- Check construction space access
+
+sub constructaccess {
+    my ($url,$setpriv)=@_;
+
+# We do not allow editing of previous versions of files
+    if ($url=~/\.(\d+)\.(\w+)$/) { return ''; }
+
+# Get username and domain from URL
+    my ($ownername,$ownerdomain,$ownerhome);
+
+    ($ownerdomain,$ownername) =
+        ($url=~ m{^(?:\Q$perlvar{'lonDocRoot'}\E|)/priv/($match_domain)/($match_username)/});
+
+# The URL does not really point to any authorspace, forget it
+    unless (($ownername) && ($ownerdomain)) { return ''; }
+
+# Now we need to see if the user has access to the authorspace of
+# $ownername at $ownerdomain
+
+    if (($ownername eq $env{'user.name'}) && ($ownerdomain eq $env{'user.domain'})) {
+# Real author for this?
+       $ownerhome = $env{'user.home'};
+       if (exists($env{'user.priv.au./'.$ownerdomain.'/./'})) {
+          return ($ownername,$ownerdomain,$ownerhome);
+       }
+    } else {
+# Co-author for this?
+        if (exists($env{'user.priv.ca./'.$ownerdomain.'/'.$ownername.'./'}) ||
+            exists($env{'user.priv.aa./'.$ownerdomain.'/'.$ownername.'./'}) ) {
+            $ownerhome = &homeserver($ownername,$ownerdomain);
+            return ($ownername,$ownerdomain,$ownerhome);
+        }
+    }
+
+# We don't have any access right now. If we are not possibly going to do anything about this,
+# we might as well leave
+   unless ($setpriv) { return ''; }
+
+# Backdoor access?
+    my $allowed=&allowed('eco',$ownerdomain);
+# Nope
+    unless ($allowed) { return ''; }
+# Looks like we may have access, but could be locked by the owner of the construction space
+    if ($allowed eq 'U') {
+        my %blocked=&get('environment',['domcoord.author'],
+                         $ownerdomain,$ownername);
+# Is blocked by owner
+        if ($blocked{'domcoord.author'} eq 'blocked') { return ''; }
+    }
+    if (($allowed eq 'F') || ($allowed eq 'U')) {
+# Grant temporary access
+        my $then=$env{'user.login.time'};
+        my $update==$env{'user.update.time'};
+        if (!$update) { $update = $then; }
+        my $refresh=$env{'user.refresh.time'};
+        if (!$refresh) { $refresh = $update; }
+        my $now = time;
+        &check_adhoc_privs($ownerdomain,$ownername,$update,$refresh,
+                           $now,'ca','constructaccess');
+        $ownerhome = &homeserver($ownername,$ownerdomain);
+        return($ownername,$ownerdomain,$ownerhome);
+    }
+# No business here
+    return '';
+}
+
+sub get_comm_blocks {
+    my ($cdom,$cnum) = @_;
+    if ($cdom eq '' || $cnum eq '') {
+        return unless ($env{'request.course.id'});
+        $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+        $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+    }
+    my %commblocks;
+    my $hashid=$cdom.'_'.$cnum;
+    my ($blocksref,$cached)=&is_cached_new('comm_block',$hashid);
+    if ((defined($cached)) && (ref($blocksref) eq 'HASH')) {
+        %commblocks = %{$blocksref};
+    } else {
+        %commblocks = &Apache::lonnet::dump('comm_block',$cdom,$cnum);
+        my $cachetime = 600;
+        &do_cache_new('comm_block',$hashid,\%commblocks,$cachetime);
+    }
+    return %commblocks;
+}
+
+sub has_comm_blocking {
+    my ($priv,$symb,$uri,$blocks) = @_;
+    return unless ($env{'request.course.id'});
+    return unless ($priv eq 'bre');
+    return if ($env{'user.priv.'.$env{'request.role'}} =~/evb\&([^\:]*)/);
+    my %commblocks;
+    if (ref($blocks) eq 'HASH') {
+        %commblocks = %{$blocks};
+    } else {
+        %commblocks = &get_comm_blocks();
+    }
+    return unless (keys(%commblocks) > 0);
+    if (!$symb) { $symb=&symbread($uri,1); }
+    my ($map,$resid,undef)=&decode_symb($symb);
+    my %tocheck = (
+                    maps      => $map,
+                    resources => $symb,
+                  );
+    my @blockers;
+    my $now = time;
+    my $navmap = Apache::lonnavmaps::navmap->new();
+    foreach my $block (keys(%commblocks)) {
+        if ($block =~ /^(\d+)____(\d+)$/) {
+            my ($start,$end) = ($1,$2);
+            if ($start <= $now && $end >= $now) {
+                if (ref($commblocks{$block}{'blocks'}) eq 'HASH') {
+                    if (ref($commblocks{$block}{'blocks'}{'docs'}) eq 'HASH') {
+                        if (ref($commblocks{$block}{'blocks'}{'docs'}{'maps'}) eq 'HASH') {
+                            if ($commblocks{$block}{'blocks'}{'docs'}{'maps'}{$map}) {
+                                unless (grep(/^\Q$block\E$/,@blockers)) {
+                                    push(@blockers,$block);
+                                }
+                            }
+                        }
+                        if (ref($commblocks{$block}{'blocks'}{'docs'}{'resources'}) eq 'HASH') {
+                            if ($commblocks{$block}{'blocks'}{'docs'}{'resources'}{$symb}) {
+                                unless (grep(/^\Q$block\E$/,@blockers)) {  
+                                    push(@blockers,$block);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        } elsif ($block =~ /^firstaccess____(.+)$/) {
+            my $item = $1;
+            my @to_test;
+            if (ref($commblocks{$block}{'blocks'}) eq 'HASH') {
+                if (ref($commblocks{$block}{'blocks'}{'docs'}) eq 'HASH') {
+                    my $check_interval;
+                    if (&check_docs_block($commblocks{$block}{'blocks'}{'docs'},\%tocheck)) {
+                        my @interval;
+                        my $type = 'map';
+                        if ($item eq 'course') {
+                            $type = 'course';
+                            @interval=&EXT("resource.0.interval");
+                        } else {
+                            if ($item =~ /___\d+___/) {
+                                $type = 'resource';
+                                @interval=&EXT("resource.0.interval",$item);
+                                if (ref($navmap)) {                        
+                                    my $res = $navmap->getBySymb($item); 
+                                    push(@to_test,$res);
+                                }
+                            } else {
+                                my $mapsymb = &symbread($item,1);
+                                if ($mapsymb) {
+                                    if (ref($navmap)) {
+                                        my $mapres = $navmap->getBySymb($mapsymb);
+                                        @to_test = $mapres->retrieveResources($mapres,undef,0,1);
+                                        foreach my $res (@to_test) {
+                                            my $symb = $res->symb();
+                                            next if ($symb eq $mapsymb);
+                                            if ($symb ne '') {
+                                                @interval=&EXT("resource.0.interval",$symb);
+                                                last;
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                        if ($interval[0] =~ /\d+/) {
+                            my $first_access;
+                            if ($type eq 'resource') {
+                                $first_access=&get_first_access($interval[1],$item);
+                            } elsif ($type eq 'map') {
+                                $first_access=&get_first_access($interval[1],undef,$item);
+                            } else {
+                                $first_access=&get_first_access($interval[1]);
+                            }
+                            if ($first_access) {
+                                my $timesup = $first_access+$interval[0];
+                                if ($timesup > $now) {
+                                    foreach my $res (@to_test) {
+                                        if ($res->is_problem()) {
+                                            if ($res->completable()) {
+                                                unless (grep(/^\Q$block\E$/,@blockers)) {
+                                                    push(@blockers,$block);
+                                                }
+                                                last;
+                                            }
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+    return @blockers;
+}
+
+sub check_docs_block {
+    my ($docsblock,$tocheck) =@_;
+    if ((ref($docsblock) ne 'HASH') || (ref($tocheck) ne 'HASH')) {
+        return;
+    }
+    if (ref($docsblock->{'maps'}) eq 'HASH') {
+        if ($tocheck->{'maps'}) {
+            if ($docsblock->{'maps'}{$tocheck->{'maps'}}) {
+                return 1;
+            }
+        }
+    }
+    if (ref($docsblock->{'resources'}) eq 'HASH') {
+        if ($tocheck->{'resources'}) {
+            if ($docsblock->{'resources'}{$tocheck->{'resources'}}) {
+                return 1;
+            }
+        }
+    }
+    return;
+}
+
+#
+#   Removes the versino from a URI and
+#   splits it in to its filename and path to the filename.
+#   Seems like File::Basename could have done this more clearly.
+#   Parameters:
+#      $uri   - input URI
+#   Returns:
+#     Two element list consisting of 
+#     $pathname  - the URI up to and excluding the trailing /
+#     $filename  - The part of the URI following the last /
+#  NOTE:
+#    Another realization of this is simply:
+#    use File::Basename;
+#    ...
+#    $uri = shift;
+#    $filename = basename($uri);
+#    $path     = dirname($uri);
+#    return ($filename, $path);
+#
+#     The implementation below is probably faster however.
+#
 sub split_uri_for_cond {
     my $uri=&deversion(&declutter(shift));
     my @uriparts=split(/\//,$uri);
@@ -5182,8 +7224,7 @@ sub update_allusers_table {
                'generation='.&escape($names->{'generation'}).'%%'.
                'permanentemail='.&escape($names->{'permanentemail'}).'%%'.
                'id='.&escape($names->{'id'}),$homeserver);
-    my $reply = &get_query_reply($queryid);
-    return $reply;
+    return;
 }
 
 # ------- Request retrieval of institutional classlists for course(s)
@@ -5200,7 +7241,7 @@ sub fetch_enrollment_query {
     }
     my $host=&hostname($homeserver);
     my $cmd = '';
-    foreach my $affiliate (keys %{$affiliatesref}) {
+    foreach my $affiliate (keys(%{$affiliatesref})) {
         $cmd .= $affiliate.'='.join(",",@{$$affiliatesref{$affiliate}}).'%%';
     }
     $cmd =~ s/%%$//;
@@ -5227,7 +7268,7 @@ sub fetch_enrollment_query {
                 $$replyref{$key} = $value;
             }
         } else {
-            my $pathname = $perlvar{'lonDaemons'}.'/tmp';
+            my $pathname = LONCAPA::tempdir();
             foreach my $line (@responses) {
                 my ($key,$value) = split(/=/,$line);
                 $$replyref{$key} = $value;
@@ -5257,7 +7298,7 @@ sub fetch_enrollment_query {
 
 sub get_query_reply {
     my $queryid=shift;
-    my $replyfile=$perlvar{'lonDaemons'}.'/tmp/'.$queryid;
+    my $replyfile=LONCAPA::tempdir().$queryid;
     my $reply='';
     for (1..100) {
 	sleep 2;
@@ -5333,19 +7374,29 @@ sub auto_run {
 
 sub auto_get_sections {
     my ($cnum,$cdom,$inst_coursecode) = @_;
-    my $homeserver = &homeserver($cnum,$cdom);
-    my @secs = ();
-    my $response=&unescape(&reply('autogetsections:'.$inst_coursecode.':'.$cdom,$homeserver));
-    unless ($response eq 'refused') {
-        @secs = split(/:/,$response);
+    my $homeserver;
+    if (($cdom =~ /^$match_domain$/) && ($cnum =~ /^$match_courseid$/)) { 
+        $homeserver = &homeserver($cnum,$cdom);
+    }
+    if (!defined($homeserver)) { 
+        if ($cdom =~ /^$match_domain$/) {
+            $homeserver = &domain($cdom,'primary');
+        }
+    }
+    my @secs;
+    if (defined($homeserver)) {
+        my $response=&unescape(&reply('autogetsections:'.$inst_coursecode.':'.$cdom,$homeserver));
+        unless ($response eq 'refused') {
+            @secs = split(/:/,$response);
+        }
     }
     return @secs;
 }
 
 sub auto_new_course {
-    my ($cnum,$cdom,$inst_course_id,$owner) = @_;
+    my ($cnum,$cdom,$inst_course_id,$owner,$coowners) = @_;
     my $homeserver = &homeserver($cnum,$cdom);
-    my $response=&unescape(&reply('autonewcourse:'.$inst_course_id.':'.$owner.':'.$cdom,$homeserver));
+    my $response=&unescape(&reply('autonewcourse:'.$inst_course_id.':'.&escape($owner).':'.$cdom.':'.&escape($coowners),$homeserver));
     return $response;
 }
 
@@ -5356,6 +7407,23 @@ sub auto_validate_courseID {
     return $response;
 }
 
+sub auto_validate_instcode {
+    my ($cnum,$cdom,$instcode,$owner) = @_;
+    my ($homeserver,$response);
+    if (($cdom =~ /^$match_domain$/) && ($cnum =~ /^$match_courseid$/)) {
+        $homeserver = &homeserver($cnum,$cdom);
+    }
+    if (!defined($homeserver)) {
+        if ($cdom =~ /^$match_domain$/) {
+            $homeserver = &domain($cdom,'primary');
+        }
+    }
+    $response=&unescape(&reply('autovalidateinstcode:'.$cdom.':'.
+                        &escape($instcode).':'.&escape($owner),$homeserver));
+    my ($outcome,$description) = map { &unescape($_); } split('&',$response,2);
+    return ($outcome,$description);
+}
+
 sub auto_create_password {
     my ($cnum,$cdom,$authparam,$udom) = @_;
     my ($homeserver,$response);
@@ -5470,6 +7538,13 @@ sub auto_instcode_format {
 		push(@homeservers,$tryserver);
 	    }
         }
+    } elsif ($caller eq 'requests') {
+        if ($codedom =~ /^$match_domain$/) {
+            my $chome = &domain($codedom,'primary');
+            unless ($chome eq 'no_host') {
+                push(@homeservers,$chome);
+            }
+        }
     } else {
         push(@homeservers,&homeserver($caller,$codedom));
     }
@@ -5527,7 +7602,81 @@ sub auto_instcode_defaults {
     }
 
     return $response;
-} 
+}
+
+sub auto_possible_instcodes {
+    my ($domain,$codetitles,$cat_titles,$cat_orders,$code_order) = @_;
+    unless ((ref($codetitles) eq 'ARRAY') && (ref($cat_titles) eq 'HASH') && 
+            (ref($cat_orders) eq 'HASH') && (ref($code_order) eq 'ARRAY')) {
+        return;
+    }
+    my (@homeservers,$uhome);
+    if (defined(&domain($domain,'primary'))) {
+        $uhome=&domain($domain,'primary');
+        push(@homeservers,&domain($domain,'primary'));
+    } else {
+        my %servers = &get_servers($domain,'library');
+        foreach my $tryserver (keys(%servers)) {
+            if (!grep(/^\Q$tryserver\E$/,@homeservers)) {
+                push(@homeservers,$tryserver);
+            }
+        }
+    }
+    my $response;
+    foreach my $server (@homeservers) {
+        $response=&reply('autopossibleinstcodes:'.$domain,$server);
+        next if ($response =~ /(con_lost|error|no_such_host|refused)/);
+        my ($codetitlestr,$codeorderstr,$cat_title,$cat_order) = 
+            split(':',$response);
+        @{$codetitles} = map { &unescape($_); } (split('&',$codetitlestr));
+        @{$code_order} = map { &unescape($_); } (split('&',$codeorderstr));
+        foreach my $item (split('&',$cat_title)) {   
+            my ($name,$value)=split('=',$item);
+            $cat_titles->{&unescape($name)}=&thaw_unescape($value);
+        }
+        foreach my $item (split('&',$cat_order)) {
+            my ($name,$value)=split('=',$item);
+            $cat_orders->{&unescape($name)}=&thaw_unescape($value);
+        }
+        return 'ok';
+    }
+    return $response;
+}
+
+sub auto_courserequest_checks {
+    my ($dom) = @_;
+    my ($homeserver,%validations);
+    if ($dom =~ /^$match_domain$/) {
+        $homeserver = &domain($dom,'primary');
+    }
+    unless ($homeserver eq 'no_host') {
+        my $response=&reply('autocrsreqchecks:'.$dom,$homeserver);
+        unless ($response =~ /(con_lost|error|no_such_host|refused)/) {
+            my @items = split(/&/,$response);
+            foreach my $item (@items) {
+                my ($key,$value) = split('=',$item);
+                $validations{&unescape($key)} = &thaw_unescape($value);
+            }
+        }
+    }
+    return %validations; 
+}
+
+sub auto_courserequest_validation {
+    my ($dom,$owner,$crstype,$inststatuslist,$instcode,$instseclist) = @_;
+    my ($homeserver,$response);
+    if ($dom =~ /^$match_domain$/) {
+        $homeserver = &domain($dom,'primary');
+    }
+    unless ($homeserver eq 'no_host') {  
+          
+        $response=&unescape(&reply('autocrsreqvalidation:'.$dom.':'.&escape($owner).
+                                    ':'.&escape($crstype).':'.&escape($inststatuslist).
+                                    ':'.&escape($instcode).':'.&escape($instseclist),
+                                    $homeserver));
+    }
+    return $response;
+}
 
 sub auto_validate_class_sec {
     my ($cdom,$cnum,$owners,$inst_class) = @_;
@@ -5681,30 +7830,37 @@ sub devalidate_getgroups_cache {
 
 sub plaintext {
     my ($short,$type,$cid,$forcedefault) = @_;
-    if ($short =~ /^cr/) {
+    if ($short =~ m{^cr/}) {
 	return (split('/',$short))[-1];
     }
     if (!defined($cid)) {
         $cid = $env{'request.course.id'};
     }
-    if (defined($cid) && ($env{'course.'.$cid.'.'.$short.'.plaintext'} ne '')) {
-        unless ($forcedefault) {
-            my $roletext = $env{'course.'.$cid.'.'.$short.'.plaintext'}; 
-            &Apache::lonlocal::mt_escape(\$roletext);
-            return &Apache::lonlocal::mt($roletext);
-        }
-    }
     my %rolenames = (
-                      Course => 'std',
-                      Group => 'alt1',
+                      Course    => 'std',
+                      Community => 'alt1',
                     );
-    if (defined($type) && 
-         defined($rolenames{$type}) && 
-         defined($prp{$short}{$rolenames{$type}})) {
+    if ($cid ne '') {
+        if ($env{'course.'.$cid.'.'.$short.'.plaintext'} ne '') {
+            unless ($forcedefault) {
+                my $roletext = $env{'course.'.$cid.'.'.$short.'.plaintext'}; 
+                &Apache::lonlocal::mt_escape(\$roletext);
+                return &Apache::lonlocal::mt($roletext);
+            }
+        }
+    }
+    if ((defined($type)) && (defined($rolenames{$type})) &&
+        (defined($rolenames{$type})) && 
+        (defined($prp{$short}{$rolenames{$type}}))) {
         return &Apache::lonlocal::mt($prp{$short}{$rolenames{$type}});
-    } else {
-        return &Apache::lonlocal::mt($prp{$short}{'std'});
+    } elsif ($cid ne '') {
+        my $crstype = $env{'course.'.$cid.'.type'};
+        if (($crstype ne '') && (defined($rolenames{$crstype})) &&
+            (defined($prp{$short}{$rolenames{$crstype}}))) {
+            return &Apache::lonlocal::mt($prp{$short}{$rolenames{$crstype}});
+        }
     }
+    return &Apache::lonlocal::mt($prp{$short}{'std'});
 }
 
 # ----------------------------------------------------------------- Assign Role
@@ -5717,10 +7873,27 @@ sub assignrole {
         my $cwosec=$url;
         $cwosec=~s/^\/($match_domain)\/($match_courseid)\/.*/$1\/$2/;
 	unless (&allowed('ccr',$cwosec)) {
-           &logthis('Refused custom assignrole: '.
-             $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.' by '.
-		    $env{'user.name'}.' at '.$env{'user.domain'});
-           return 'refused'; 
+           my $refused = 1;
+           if ($context eq 'requestcourses') {
+               if (($env{'user.name'} ne '') && ($env{'user.domain'} ne '')) {
+                   if ($role =~ m{^cr/($match_domain)/($match_username)/([^/]+)$}) {
+                       if (($1 eq $env{'user.domain'}) && ($2 eq $env{'user.name'})) {
+                           my ($cdom,$cnum) = ($cwosec =~ m{^/?($match_domain)/($match_courseid)$});
+                           my %crsenv = &userenvironment($cdom,$cnum,('internal.courseowner'));
+                           if ($crsenv{'internal.courseowner'} eq
+                               $env{'user.name'}.':'.$env{'user.domain'}) {
+                               $refused = '';
+                           }
+                       }
+                   }
+               }
+           }
+           if ($refused) {
+               &logthis('Refused custom assignrole: '.
+                        $udom.' '.$uname.' '.$url.' '.$role.' '.$end.' '.$start.
+                        ' by '.$env{'user.name'}.' at '.$env{'user.domain'});
+               return 'refused';
+           }
         }
         $mrole='cr';
     } elsif ($role =~ /^gr\//) {
@@ -5746,15 +7919,96 @@ sub assignrole {
                 $refused = 1;
             }
             if ($refused) {
-                if (($selfenroll == 1) && ($role eq 'st') && ($udom eq $env{'user.domain'}) && ($uname eq $env{'user.name'})) {
+                my ($cdom,$cnum) = ($cwosec =~ m{^/?($match_domain)/($match_courseid)$});
+                if (!$selfenroll && $context eq 'course') {
+                    my %crsenv;
+                    if ($role eq 'cc' || $role eq 'co') {
+                        %crsenv = &userenvironment($cdom,$cnum,('internal.courseowner'));
+                        if (($role eq 'cc') && ($cnum !~ /^$match_community$/)) {
+                            if ($env{'request.role'} eq 'cc./'.$cdom.'/'.$cnum) {
+                                if ($crsenv{'internal.courseowner'} eq 
+                                    $env{'user.name'}.':'.$env{'user.domain'}) {
+                                    $refused = '';
+                                }
+                            }
+                        } elsif (($role eq 'co') && ($cnum =~ /^$match_community$/)) { 
+                            if ($env{'request.role'} eq 'co./'.$cdom.'/'.$cnum) {
+                                if ($crsenv{'internal.courseowner'} eq 
+                                    $env{'user.name'}.':'.$env{'user.domain'}) {
+                                    $refused = '';
+                                }
+                            }
+                        }
+                    }
+                } elsif (($selfenroll == 1) && ($role eq 'st') && ($udom eq $env{'user.domain'}) && ($uname eq $env{'user.name'})) {
                     $refused = '';
-                } else {
+                } elsif ($context eq 'requestcourses') {
+                    my @possroles = ('st','ta','ep','in','cc','co');
+                    if ((grep(/^\Q$role\E$/,@possroles)) && ($env{'user.name'} ne '' && $env{'user.domain'} ne '')) {
+                        my $wrongcc;
+                        if ($cnum =~ /^$match_community$/) {
+                            $wrongcc = 1 if ($role eq 'cc');
+                        } else {
+                            $wrongcc = 1 if ($role eq 'co');
+                        }
+                        unless ($wrongcc) {
+                            my %crsenv = &userenvironment($cdom,$cnum,('internal.courseowner'));
+                            if ($crsenv{'internal.courseowner'} eq 
+                                 $env{'user.name'}.':'.$env{'user.domain'}) {
+                                $refused = '';
+                            }
+                        }
+                    }
+                } elsif ($context eq 'requestauthor') {
+                    if (($udom eq $env{'user.domain'}) && ($uname eq $env{'user.name'}) && 
+                        ($url eq '/'.$udom.'/') && ($role eq 'au')) {
+                        if ($env{'environment.requestauthor'} eq 'automatic') {
+                            $refused = '';
+                        } else {
+                            my %domdefaults = &get_domain_defaults($udom);
+                            if (ref($domdefaults{'requestauthor'}) eq 'HASH') {
+                                my $checkbystatus;
+                                if ($env{'user.adv'}) { 
+                                    my $disposition = $domdefaults{'requestauthor'}{'_LC_adv'};
+                                    if ($disposition eq 'automatic') {
+                                        $refused = '';
+                                    } elsif ($disposition eq '') {
+                                        $checkbystatus = 1;
+                                    } 
+                                } else {
+                                    $checkbystatus = 1;
+                                }
+                                if ($checkbystatus) {
+                                    if ($env{'environment.inststatus'}) {
+                                        my @inststatuses = split(/,/,$env{'environment.inststatus'});
+                                        foreach my $type (@inststatuses) {
+                                            if (($type ne '') &&
+                                                ($domdefaults{'requestauthor'}{$type} eq 'automatic')) {
+                                                $refused = '';
+                                            }
+                                        }
+                                    } elsif ($domdefaults{'requestauthor'}{'default'} eq 'automatic') {
+                                        $refused = '';
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+                if ($refused) {
                     &logthis('Refused assignrole: '.$udom.' '.$uname.' '.$url.
                              ' '.$role.' '.$end.' '.$start.' by '.
 	  	             $env{'user.name'}.' at '.$env{'user.domain'});
                     return 'refused';
                 }
             }
+        } elsif ($role eq 'au') {
+            if ($url ne '/'.$udom.'/') {
+                &logthis('Attempt by '.$env{'user.name'}.':'.$env{'user.domain'}.
+                         ' to assign author role for '.$uname.':'.$udom.
+                         ' in domain: '.$url.' refused (wrong domain).');
+                return 'refused';
+            }
         }
         $mrole=$role;
     }
@@ -5789,16 +8043,117 @@ sub assignrole {
 # log new user role if status is ok
     if ($answer eq 'ok') {
 	&userrolelog($role,$uname,$udom,$url,$start,$end);
+        if (($role eq 'cc') || ($role eq 'in') ||
+            ($role eq 'ep') || ($role eq 'ad') ||
+            ($role eq 'ta') || ($role eq 'st') ||
+            ($role=~/^cr/) || ($role eq 'gr') ||
+            ($role eq 'co')) {
 # for course roles, perform group memberships changes triggered by role change.
-        &courserolelog($role,$uname,$udom,$url,$origstart,$origend,$delflag,$selfenroll,$context);
-        unless ($role =~ /^gr/) {
-            &Apache::longroup::group_changes($udom,$uname,$url,$role,$origend,
-                                             $origstart,$selfenroll,$context);
+            unless ($role =~ /^gr/) {
+                &Apache::longroup::group_changes($udom,$uname,$url,$role,$origend,
+                                                 $origstart,$selfenroll,$context);
+            }
+            &courserolelog($role,$uname,$udom,$url,$origstart,$origend,$delflag,
+                           $selfenroll,$context);
+        } elsif (($role eq 'li') || ($role eq 'dg') || ($role eq 'sc') ||
+                 ($role eq 'au') || ($role eq 'dc')) {
+            &domainrolelog($role,$uname,$udom,$url,$origstart,$origend,$delflag,
+                           $context);
+        } elsif (($role eq 'ca') || ($role eq 'aa')) {
+            &coauthorrolelog($role,$uname,$udom,$url,$origstart,$origend,$delflag,
+                             $context); 
+        }
+        if ($role eq 'cc') {
+            &autoupdate_coowners($url,$end,$start,$uname,$udom);
         }
     }
     return $answer;
 }
 
+sub autoupdate_coowners {
+    my ($url,$end,$start,$uname,$udom) = @_;
+    my ($cdom,$cnum) = ($url =~ m{^/($match_domain)/($match_courseid)});
+    if (($cdom ne '') && ($cnum ne '')) {
+        my $now = time;
+        my %domdesign = &Apache::loncommon::get_domainconf($cdom);
+        if ($domdesign{$cdom.'.autoassign.co-owners'}) {
+            my %coursehash = &coursedescription($cdom.'_'.$cnum);
+            my $instcode = $coursehash{'internal.coursecode'};
+            if ($instcode ne '') {
+                if (($start && $start <= $now) && ($end == 0) || ($end > $now)) {
+                    unless ($coursehash{'internal.courseowner'} eq $uname.':'.$udom) {
+                        my ($delcoowners,@newcoowners,$putresult,$delresult,$coowners);
+                        my ($result,$desc) = &auto_validate_instcode($cnum,$cdom,$instcode,$uname.':'.$udom);
+                        if ($result eq 'valid') {
+                            if ($coursehash{'internal.co-owners'}) {
+                                foreach my $coowner (split(',',$coursehash{'internal.co-owners'})) {
+                                    push(@newcoowners,$coowner);
+                                }
+                                unless (grep(/^\Q$uname\E:\Q$udom\E$/,@newcoowners)) {
+                                    push(@newcoowners,$uname.':'.$udom);
+                                }
+                                @newcoowners = sort(@newcoowners);
+                            } else {
+                                push(@newcoowners,$uname.':'.$udom);
+                            }
+                        } else {
+                            if ($coursehash{'internal.co-owners'}) {
+                                foreach my $coowner (split(',',$coursehash{'internal.co-owners'})) {
+                                    unless ($coowner eq $uname.':'.$udom) {
+                                        push(@newcoowners,$coowner);
+                                    }
+                                }
+                                unless (@newcoowners > 0) {
+                                    $delcoowners = 1;
+                                    $coowners = '';
+                                }
+                            }
+                        }
+                        if (@newcoowners || $delcoowners) {
+                            &store_coowners($cdom,$cnum,$coursehash{'home'},
+                                            $delcoowners,@newcoowners);
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+sub store_coowners {
+    my ($cdom,$cnum,$chome,$delcoowners,@newcoowners) = @_;
+    my $cid = $cdom.'_'.$cnum;
+    my ($coowners,$delresult,$putresult);
+    if (@newcoowners) {
+        $coowners = join(',',@newcoowners);
+        my %coownershash = (
+                            'internal.co-owners' => $coowners,
+                           );
+        $putresult = &put('environment',\%coownershash,$cdom,$cnum);
+        if ($putresult eq 'ok') {
+            if ($env{'course.'.$cid.'.num'} eq $cnum) {
+                &appenv({'course.'.$cid.'.internal.co-owners' => $coowners});
+            }
+        }
+    }
+    if ($delcoowners) {
+        $delresult = &Apache::lonnet::del('environment',['internal.co-owners'],$cdom,$cnum);
+        if ($delresult eq 'ok') {
+            if ($env{'course.'.$cid.'.internal.co-owners'}) {
+                &Apache::lonnet::delenv('course.'.$cid.'.internal.co-owners');
+            }
+        }
+    }
+    if (($putresult eq 'ok') || ($delresult eq 'ok')) {
+        my %crsinfo =
+            &Apache::lonnet::courseiddump($cdom,'.',1,'.','.',$cnum,undef,undef,'.');
+        if (ref($crsinfo{$cid}) eq 'HASH') {
+            $crsinfo{$cid}{'co-owners'} = \@newcoowners;
+            my $cidput = &Apache::lonnet::courseidput($cdom,\%crsinfo,$chome,'notime');
+        }
+    }
+}
+
 # -------------------------------------------------- Modify user authentication
 # Overrides without validation
 
@@ -5831,17 +8186,27 @@ sub modifyuser {
     my ($udom,    $uname, $uid,
         $umode,   $upass, $first,
         $middle,  $last,  $gene,
-        $forceid, $desiredhome, $email, $inststatus)=@_;
+        $forceid, $desiredhome, $email, $inststatus, $candelete)=@_;
     $udom= &LONCAPA::clean_domain($udom);
     $uname=&LONCAPA::clean_username($uname);
+    my $showcandelete = 'none';
+    if (ref($candelete) eq 'ARRAY') {
+        if (@{$candelete} > 0) {
+            $showcandelete = join(', ',@{$candelete});
+        }
+    }
     &logthis('Call to modify user '.$udom.', '.$uname.', '.$uid.', '.
              $umode.', '.$first.', '.$middle.', '.
-	     $last.', '.$gene.'(forceid: '.$forceid.')'.
+	     $last.', '.$gene.'(forceid: '.$forceid.'; candelete: '.$showcandelete.')'.
              (defined($desiredhome) ? ' desiredhome = '.$desiredhome :
                                      ' desiredhome not specified'). 
              ' by '.$env{'user.name'}.' at '.$env{'user.domain'}.
              ' in domain '.$env{'request.role.domain'});
     my $uhome=&homeserver($uname,$udom,'true');
+    my $newuser;
+    if ($uhome eq 'no_host') {
+        $newuser = 1;
+    }
 # ----------------------------------------------------------------- Create User
     if (($uhome eq 'no_host') && 
 	(($umode && $upass) || ($umode eq 'localauth'))) {
@@ -5894,16 +8259,41 @@ sub modifyuser {
 		   ['firstname','middlename','lastname','generation','id',
                     'permanentemail','inststatus'],
 		   $udom,$uname);
-    my %names;
+    my (%names,%oldnames);
     if ($tmp[0] =~ m/^error:.*/) { 
         %names=(); 
     } else {
         %names = @tmp;
+        %oldnames = %names;
     }
 #
-# Make sure to not trash student environment if instructor does not bother
-# to supply name and email information
-#
+# If name, email and/or uid are blank (e.g., because an uploaded file
+# of users did not contain them), do not overwrite existing values
+# unless field is in $candelete array ref.  
+#
+
+    my @fields = ('firstname','middlename','lastname','generation',
+                  'permanentemail','id');
+    my %newvalues;
+    if (ref($candelete) eq 'ARRAY') {
+        foreach my $field (@fields) {
+            if (grep(/^\Q$field\E$/,@{$candelete})) {
+                if ($field eq 'firstname') {
+                    $names{$field} = $first;
+                } elsif ($field eq 'middlename') {
+                    $names{$field} = $middle;
+                } elsif ($field eq 'lastname') {
+                    $names{$field} = $last;
+                } elsif ($field eq 'generation') { 
+                    $names{$field} = $gene;
+                } elsif ($field eq 'permanentemail') {
+                    $names{$field} = $email;
+                } elsif ($field eq 'id') {
+                    $names{$field}  = $uid;
+                }
+            }
+        }
+    }
     if ($first)  { $names{'firstname'}  = $first; }
     if (defined($middle)) { $names{'middlename'} = $middle; }
     if ($last)   { $names{'lastname'}   = $last; }
@@ -5928,18 +8318,40 @@ sub modifyuser {
             }
         }
     }
-    my $reply = &put('environment', \%names, $udom,$uname);
-    if ($reply ne 'ok') { return 'error: '.$reply; }
-    my $sqlresult = &update_allusers_table($uname,$udom,\%names);
-    &devalidate_cache_new('namescache',$uname.':'.$udom);
-    my $logmsg = 'Success modifying user '.$udom.', '.$uname.', '.$uid.', '.
+    my $logmsg = $udom.', '.$uname.', '.$uid.', '.
                  $umode.', '.$first.', '.$middle.', '.
-	         $last.', '.$gene.', '.$email.', '.$inststatus;
+                 $last.', '.$gene.', '.$email.', '.$inststatus;
     if ($env{'user.name'} ne '' && $env{'user.domain'}) {
         $logmsg .= ' by '.$env{'user.name'}.' at '.$env{'user.domain'};
     } else {
         $logmsg .= ' during self creation';
     }
+    my $changed;
+    if ($newuser) {
+        $changed = 1;
+    } else {
+        foreach my $field (@fields) {
+            if ($names{$field} ne $oldnames{$field}) {
+                $changed = 1;
+                last;
+            }
+        }
+    }
+    unless ($changed) {
+        $logmsg = 'No changes in user information needed for: '.$logmsg;
+        &logthis($logmsg);
+        return 'ok';
+    }
+    my $reply = &put('environment', \%names, $udom,$uname);
+    if ($reply ne 'ok') { 
+        return 'error: '.$reply;
+    }
+    if ($names{'permanentemail'} ne $oldnames{'permanentemail'}) {
+        &Apache::lonnet::devalidate_cache_new('emailscache',$uname.':'.$udom);
+    }
+    my $sqlresult = &update_allusers_table($uname,$udom,\%names);
+    &devalidate_cache_new('namescache',$uname.':'.$udom);
+    $logmsg = 'Success modifying user '.$logmsg;
     &logthis($logmsg);
     return 'ok';
 }
@@ -6012,14 +8424,16 @@ sub modify_student_enrollment {
         $uid    = $tmp{'id'}         if (!defined($uid)    || $uid  eq '');
     }
     my $fullname = &format_name($first,$middle,$last,$gene,'lastname');
+    my $user = "$uname:$udom";
+    my %old_entry = &Apache::lonnet::get('classlist',[$user],$cdom,$cnum);
     my $reply=cput('classlist',
-		   {"$uname:$udom" => 
+		   {$user => 
 			join(':',$end,$start,$uid,$usec,$fullname,$type,$locktype) },
 		   $cdom,$cnum);
-    unless (($reply eq 'ok') || ($reply eq 'delayed')) {
+    if (($reply eq 'ok') || ($reply eq 'delayed')) {
+        &devalidate_getsection_cache($udom,$uname,$cid);
+    } else { 
 	return 'error: '.$reply;
-    } else {
-	&devalidate_getsection_cache($udom,$uname,$cid);
     }
     # Add student role to user
     my $uurl='/'.$cid;
@@ -6027,7 +8441,16 @@ sub modify_student_enrollment {
     if ($usec) {
 	$uurl.='/'.$usec;
     }
-    return &assignrole($udom,$uname,$uurl,'st',$end,$start,undef,$selfenroll,$context);
+    my $result = &assignrole($udom,$uname,$uurl,'st',$end,$start,undef,
+                             $selfenroll,$context);
+    if ($result ne 'ok') {
+        if ($old_entry{$user} ne '') {
+            $reply = &cput('classlist',\%old_entry,$cdom,$cnum);
+        } else {
+            $reply = &del('classlist',[$user],$cdom,$cnum);
+        }
+    }
+    return $result; 
 }
 
 sub format_name {
@@ -6072,48 +8495,90 @@ sub writecoursepref {
 
 sub createcourse {
     my ($udom,$description,$url,$course_server,$nonstandard,$inst_code,
-        $course_owner,$crstype)=@_;
+        $course_owner,$crstype,$cnum,$context,$category)=@_;
     $url=&declutter($url);
     my $cid='';
-    unless (&allowed('ccc',$udom)) {
+    if ($context eq 'requestcourses') {
+        my $can_create = 0;
+        my ($ownername,$ownerdom) = split(':',$course_owner);
+        if ($udom eq $ownerdom) {
+            if (&usertools_access($ownername,$ownerdom,$category,undef,
+                                  $context)) {
+                $can_create = 1;
+            }
+        } else {
+            my %userenv = &userenvironment($ownerdom,$ownername,'reqcrsotherdom.'.
+                                           $category);
+            if ($userenv{'reqcrsotherdom.'.$category} ne '') {
+                my @curr = split(',',$userenv{'reqcrsotherdom.'.$category});
+                if (@curr > 0) {
+                    my @options = qw(approval validate autolimit);
+                    my $optregex = join('|',@options);
+                    if (grep(/^\Q$udom\E:($optregex)(=?\d*)$/,@curr)) {
+                        $can_create = 1;
+                    }
+                }
+            }
+        }
+        if ($can_create) {
+            unless ($ownername eq $env{'user.name'} && $ownerdom eq $env{'user.domain'}) {
+                unless (&allowed('ccc',$udom)) {
+                    return 'refused'; 
+                }
+            }
+        } else {
+            return 'refused';
+        }
+    } elsif (!&allowed('ccc',$udom)) {
         return 'refused';
     }
-# ------------------------------------------------------------------- Create ID
-   my $uname=int(1+rand(9)).
-       ('a'..'z','A'..'Z','0'..'9')[int(rand(62))].
-       substr($$.time,0,5).unpack("H8",pack("I32",time)).
-       unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
-# ----------------------------------------------- Make sure that does not exist
-   my $uhome=&homeserver($uname,$udom,'true');
-   unless (($uhome eq '') || ($uhome eq 'no_host')) {
-       $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
-        unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
-       $uhome=&homeserver($uname,$udom,'true');       
-       unless (($uhome eq '') || ($uhome eq 'no_host')) {
-           return 'error: unable to generate unique course-ID';
-       } 
-   }
-# ------------------------------------------------ Check supplied server name
-    $course_server = $env{'user.homeserver'} if (! defined($course_server));
-    if (! &is_library($course_server)) {
-        return 'error:bad server name '.$course_server;
+# --------------------------------------------------------------- Get Unique ID
+    my $uname;
+    if ($cnum =~ /^$match_courseid$/) {
+        my $chome=&homeserver($cnum,$udom,'true');
+        if (($chome eq '') || ($chome eq 'no_host')) {
+            $uname = $cnum;
+        } else {
+            $uname = &generate_coursenum($udom,$crstype);
+        }
+    } else {
+        $uname = &generate_coursenum($udom,$crstype);
+    }
+    return $uname if ($uname =~ /^error/);
+# -------------------------------------------------- Check supplied server name
+    if (!defined($course_server)) {
+        if (defined(&domain($udom,'primary'))) {
+            $course_server = &domain($udom,'primary');
+        } else {
+            $course_server = $env{'user.home'}; 
+        }
+    }
+    my %host_servers =
+        &Apache::lonnet::get_servers($udom,'library');
+    unless ($host_servers{$course_server}) {
+        return 'error: invalid home server for course: '.$course_server;
     }
 # ------------------------------------------------------------- Make the course
     my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
                       $course_server);
     unless ($reply eq 'ok') { return 'error: '.$reply; }
-    $uhome=&homeserver($uname,$udom,'true');
+    my $uhome=&homeserver($uname,$udom,'true');
     if (($uhome eq '') || ($uhome eq 'no_host')) { 
 	return 'error: no such course';
     }
 # ----------------------------------------------------------------- Course made
 # log existence
+    my $now = time;
     my $newcourse = {
                     $udom.'_'.$uname => {
                                      description => $description,
                                      inst_code   => $inst_code,
                                      owner       => $course_owner,
                                      type        => $crstype,
+                                     creator     => $env{'user.name'}.':'.
+                                                    $env{'user.domain'},
+                                     created     => $now,
+                                     context     => $context,
                                                 },
                     };
     &courseidput($udom,$newcourse,$uhome,'notime');
@@ -6138,19 +8603,95 @@ ENDINITMAP
     }
 # ----------------------------------------------------------- Write preferences
     &writecoursepref($udom.'_'.$uname,
-                     ('description' => $description,
-                      'url'         => $topurl));
+                     ('description'              => $description,
+                      'url'                      => $topurl,
+                      'internal.creator'         => $env{'user.name'}.':'.
+                                                    $env{'user.domain'},
+                      'internal.created'         => $now,
+                      'internal.creationcontext' => $context)
+                    );
     return '/'.$udom.'/'.$uname;
 }
 
+# ------------------------------------------------------------------- Create ID
+sub generate_coursenum {
+    my ($udom,$crstype) = @_;
+    my $domdesc = &domain($udom);
+    return 'error: invalid domain' if ($domdesc eq '');
+    my $first;
+    if ($crstype eq 'Community') {
+        $first = '0';
+    } else {
+        $first = int(1+rand(9)); 
+    } 
+    my $uname=$first.
+        ('a'..'z','A'..'Z','0'..'9')[int(rand(62))].
+        substr($$.time,0,5).unpack("H8",pack("I32",time)).
+        unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+# ----------------------------------------------- Make sure that does not exist
+    my $uhome=&homeserver($uname,$udom,'true');
+    unless (($uhome eq '') || ($uhome eq 'no_host')) {
+        if ($crstype eq 'Community') {
+            $first = '0';
+        } else {
+            $first = int(1+rand(9));
+        }
+        $uname=$first.
+               ('a'..'z','A'..'Z','0'..'9')[int(rand(62))].
+               substr($$.time,0,5).unpack("H8",pack("I32",time)).
+               unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+        $uhome=&homeserver($uname,$udom,'true');
+        unless (($uhome eq '') || ($uhome eq 'no_host')) {
+            return 'error: unable to generate unique course-ID';
+        }
+    }
+    return $uname;
+}
+
 sub is_course {
-    my ($cdom,$cnum) = @_;
-    my %courses = &courseiddump($cdom,'.',1,'.','.',$cnum,undef,
-				undef,'.');
-    if (exists($courses{$cdom.'_'.$cnum})) {
-        return 1;
+    my ($cdom, $cnum) = scalar(@_) == 1 ? 
+         ($_[0] =~ /^($match_domain)_($match_courseid)$/)  :  @_;
+
+    return unless $cdom and $cnum;
+
+    my %courses = &courseiddump($cdom, '.', 1, '.', '.', $cnum, undef, undef,
+        '.');
+
+    return unless exists($courses{$cdom.'_'.$cnum});
+    return wantarray ? ($cdom, $cnum) : $cdom.'_'.$cnum;
+}
+
+sub store_userdata {
+    my ($storehash,$datakey,$namespace,$udom,$uname) = @_;
+    my $result;
+    if ($datakey ne '') {
+        if (ref($storehash) eq 'HASH') {
+            if ($udom eq '' || $uname eq '') {
+                $udom = $env{'user.domain'};
+                $uname = $env{'user.name'};
+            }
+            my $uhome=&homeserver($uname,$udom);
+            if (($uhome eq '') || ($uhome eq 'no_host')) {
+                $result = 'error: no_host';
+            } else {
+                $storehash->{'ip'} = $ENV{'REMOTE_ADDR'};
+                $storehash->{'host'} = $perlvar{'lonHostID'};
+
+                my $namevalue='';
+                foreach my $key (keys(%{$storehash})) {
+                    $namevalue.=&escape($key).'='.&freeze_escape($$storehash{$key}).'&';
+                }
+                $namevalue=~s/\&$//;
+                $result =  &reply("store:$udom:$uname:$namespace:$datakey:".
+                                  $namevalue,$uhome);
+            }
+        } else {
+            $result = 'error: data to store was not a hash reference'; 
+        }
+    } else {
+        $result= 'error: invalid requestkey'; 
     }
-    return 0;
+    return $result;
 }
 
 # ---------------------------------------------------------- Assign Custom Role
@@ -6195,10 +8736,10 @@ sub diskusage {
 }
 
 sub is_locked {
-    my ($file_name, $domain, $user) = @_;
+    my ($file_name, $domain, $user, $which) = @_;
     my @check;
     my $is_locked;
-    push @check, $file_name;
+    push (@check,$file_name);
     my %locked = &get('file_permissions',\@check,
 		      $env{'user.domain'},$env{'user.name'});
     my ($tmp)=keys(%locked);
@@ -6207,14 +8748,19 @@ sub is_locked {
     if (ref($locked{$file_name}) eq 'ARRAY') {
         $is_locked = 'false';
         foreach my $entry (@{$locked{$file_name}}) {
-           if (ref($entry) eq 'ARRAY') { 
+           if (ref($entry) eq 'ARRAY') {
                $is_locked = 'true';
-               last;
+               if (ref($which) eq 'ARRAY') {
+                   push(@{$which},$entry);
+               } else {
+                   last;
+               }
            }
        }
     } else {
         $is_locked = 'false';
     }
+    return $is_locked;
 }
 
 sub declutter_portfile {
@@ -6258,7 +8804,7 @@ sub save_selected_files {
 sub clear_selected_files {
     my ($user) = @_;
     my $filename = $user."savedfiles";
-    open (OUT, '>'.$Apache::lonnet::perlvar{'lonDaemons'}.'/tmp/'.$filename);
+    open (OUT, '>'.LONCAPA::tempdir().$filename);
     print (OUT undef);
     close (OUT);
     return ("ok");    
@@ -6268,7 +8814,7 @@ sub files_in_path {
     my ($user, $path) = @_;
     my $filename = $user."savedfiles";
     my %return_files;
-    open (IN, '<'.$Apache::lonnet::perlvar{'lonDaemons'}.'/tmp/'.$filename);
+    open (IN, '<'.LONCAPA::tempdir().$filename);
     while (my $line_in = <IN>) {
         chomp ($line_in);
         my @paths_and_file = split (m!/!, $line_in);
@@ -6290,7 +8836,7 @@ sub files_not_in_path {
     my $filename = $user."savedfiles";
     my @return_files;
     my $path_part;
-    open(IN, '<'.$Apache::lonnet::perlvar{'lonDaemons'}.'/tmp/'.$filename);
+    open(IN, '<'.LONCAPA::.$filename);
     while (my $line = <IN>) {
         #ok, I know it's clunky, but I want it to work
         my @paths_and_file = split(m|/|, $line);
@@ -6638,26 +9184,33 @@ sub dirlist {
 
     if($udom) {
         if($uname) {
+            my $uhome = &homeserver($uname,$udom);
+            if ($uhome eq 'no_host') {
+                return ([],'no_host');
+            }
             $listing = &reply('ls3:'.&escape('/'.$uri).':'.$getpropath.':'
                               .$getuserdir.':'.&escape($dirRoot)
-                              .':'.&escape($uname).':'.&escape($udom),
-                              &homeserver($uname,$udom));
+                              .':'.&escape($uname).':'.&escape($udom),$uhome);
             if ($listing eq 'unknown_cmd') {
-                $listing = &reply('ls2:'.$dirRoot.'/'.$uri,
-                                  &homeserver($uname,$udom));
+                $listing = &reply('ls2:'.$dirRoot.'/'.$uri,$uhome);
             } else {
                 @listing_results = map { &unescape($_); } split(/:/,$listing);
             }
             if ($listing eq 'unknown_cmd') {
-                $listing = &reply('ls:'.$dirRoot.'/'.$uri,
-				  &homeserver($uname,$udom));
+                $listing = &reply('ls:'.$dirRoot.'/'.$uri,$uhome);
                 @listing_results = split(/:/,$listing);
             } else {
                 @listing_results = map { &unescape($_); } split(/:/,$listing);
             }
-            return @listing_results;
+            if (($listing eq 'no_such_host') || ($listing eq 'con_lost') || 
+                ($listing eq 'rejected') || ($listing eq 'refused') ||
+                ($listing eq 'no_such_dir') || ($listing eq 'empty')) {
+                return ([],$listing);
+            } else {
+                return (\@listing_results);
+            }
         } elsif(!$alternateRoot) {
-            my %allusers;
+            my (%allusers,%listerror);
 	    my %servers = &get_servers($udom,'library');
  	    foreach my $tryserver (keys(%servers)) {
                 $listing = &reply('ls3:'.&escape("/res/$udom").':::::'.
@@ -6676,32 +9229,31 @@ sub dirlist {
 		    @listing_results =
 			map { &unescape($_); } split(/:/,$listing);
 		}
-		if ($listing_results[0] ne 'no_such_dir' && 
-		    $listing_results[0] ne 'empty'       &&
-		    $listing_results[0] ne 'con_lost') {
+                if (($listing eq 'no_such_host') || ($listing eq 'con_lost') ||
+                    ($listing eq 'rejected') || ($listing eq 'refused') ||
+                    ($listing eq 'no_such_dir') || ($listing eq 'empty')) {
+                    $listerror{$tryserver} = $listing;
+                } else {
 		    foreach my $line (@listing_results) {
 			my ($entry) = split(/&/,$line,2);
 			$allusers{$entry} = 1;
 		    }
 		}
             }
-            my $alluserstr='';
+            my @alluserslist=();
             foreach my $user (sort(keys(%allusers))) {
-                $alluserstr.=$user.'&user:';
+                push(@alluserslist,$user.'&user');
             }
-            $alluserstr=~s/:$//;
-            return split(/:/,$alluserstr);
+            return (\@alluserslist);
         } else {
-            return ('missing user name');
+            return ([],'missing username');
         }
     } elsif(!defined($getpropath)) {
-        my @all_domains = sort(&all_domains());
-        foreach my $domain (@all_domains) {
-            $domain = $perlvar{'lonDocRoot'}.'/res/'.$domain.'/&domain';
-        }
-        return @all_domains;
+        my $path = $perlvar{'lonDocRoot'}.'/res/'; 
+        my @all_domains = map { $path.$_.'/&domain'; } (sort(&all_domains()));
+        return (\@all_domains);
     } else {
-        return ('missing domain');
+        return ([],'missing domain');
     }
 }
 
@@ -6714,11 +9266,13 @@ sub GetFileTimestamp {
     my ($studentDomain,$studentName,$filename,$getuserdir)=@_;
     $studentDomain = &LONCAPA::clean_domain($studentDomain);
     $studentName   = &LONCAPA::clean_username($studentName);
-    my ($fileStat) = 
-        &Apache::lonnet::dirlist($filename,$studentDomain,$studentName, 
-                                 undef,$getuserdir);
-    my @stats = split('&', $fileStat);
-    if($stats[0] ne 'empty' && $stats[0] ne 'no_such_dir') {
+    my ($fileref,$error) = &dirlist($filename,$studentDomain,$studentName,
+                                    undef,$getuserdir);
+    if (($error eq 'empty') || ($error eq 'no_such_dir')) {
+        return -1;
+    }
+    if (ref($fileref) eq 'ARRAY') {
+        my @stats = split('&',$fileref->[0]);
         # @stats contains first the filename, then the stat output
         return $stats[10]; # so this is 10 instead of 9.
     } else {
@@ -6750,12 +9304,15 @@ sub stat_file {
     if ($file =~ /^userfiles\//) {
         $getpropath = 1;
     }
-    my ($result) = &dirlist($file,$udom,$uname,$getpropath);
-    my @stats = split('&', $result);
-    
-    if($stats[0] ne 'empty' && $stats[0] ne 'no_such_dir') {
-	shift(@stats); #filename is first
-	return @stats;
+    my ($listref,$error) = &dirlist($file,$udom,$uname,$getpropath);
+    if (($error eq 'empty') || ($error eq 'no_such_dir')) {
+        return ();
+    } else {
+        if (ref($listref) eq 'ARRAY') {
+            my @stats = split('&',$listref->[0]);
+	    shift(@stats); #filename is first
+	    return @stats;
+        }
     }
     return ();
 }
@@ -7076,15 +9633,7 @@ sub EXT {
    } elsif ($realm eq 'request') {
 # ------------------------------------------------------------- request.browser
         if ($space eq 'browser') {
-	    if ($qualifier eq 'textremote') {
-		if (&Apache::lonlocal::mt('textual_remote_display') eq 'on') {
-		    return 1;
-		} else {
-		    return 0;
-		}
-	    } else {
-		return $env{'browser.'.$qualifier};
-	    }
+            return $env{'browser.'.$qualifier};
 # ------------------------------------------------------------ request.filename
         } else {
             return $env{'request.'.$spacequalifierrest};
@@ -7357,6 +9906,7 @@ sub add_prefix_and_part {
 # ---------------------------------------------------------------- Get metadata
 
 my %metaentry;
+my %importedpartids;
 sub metadata {
     my ($uri,$what,$liburi,$prefix,$depthcount)=@_;
     $uri=&declutter($uri);
@@ -7364,10 +9914,10 @@ sub metadata {
     if (($uri eq '') || 
 	(($uri =~ m|^/*adm/|) && 
 	     ($uri !~ m|^adm/includes|) && ($uri !~ m|/bulletinboard$|)) ||
-        ($uri =~ m|/$|) || ($uri =~ m|/.meta$|) ) {
+        ($uri =~ m|/$|) || ($uri =~ m|/.meta$|) || ($uri =~ m{^/*uploaded/.+\.sequence$})) {
 	return undef;
     }
-    if (($uri =~ /^~/ || $uri =~ m{home/$match_username/public_html/}) 
+    if (($uri =~ /^priv/ || $uri=~/home\/httpd\/html\/priv/) 
 	&& &Apache::lonxml::get_state('target') =~ /^(|meta)$/) {
 	return undef;
     }
@@ -7383,6 +9933,10 @@ sub metadata {
 	if (defined($cached)) { return $result->{':'.$what}; }
     }
     {
+# Imported parts would go here
+        my %importedids=();
+        my @origfileimportpartids=();
+        my $importedparts=0;
 #
 # Is this a recursive call for a library?
 #
@@ -7400,13 +9954,14 @@ sub metadata {
         my %metathesekeys=();
         unless ($filename=~/\.meta$/) { $filename.='.meta'; }
 	my $metastring;
-	if ($uri =~ /^~/ || $uri =~ m{home/$match_username/public_html/}) {
+	if ($uri =~ /^priv/ || $uri=~/home\/httpd\/html\/priv/) {
 	    my $which = &hreflocation('','/'.($liburi || $uri));
 	    $metastring = 
 		&Apache::lonnet::ssi_body($which,
 					  ('grade_target' => 'meta'));
 	    $cachetime = 1; # only want this cached in the child not long term
-	} elsif ($uri !~ m -^(editupload)/-) {
+	} elsif (($uri !~ m -^(editupload)/-) && 
+                 ($uri !~ m{^/*uploaded/$match_domain/$match_courseid/docs/})) {
 	    my $file=&filelocation('',&clutter($filename));
 	    #push(@{$metaentry{$uri.'.file'}},$file);
 	    $metastring=&getfile($file);
@@ -7466,27 +10021,55 @@ sub metadata {
 # This is not a package - some other kind of start tag
 #
 		    my $entry=$token->[1];
-		    my $unikey;
-		    if ($entry eq 'import') {
-			$unikey='';
-		    } else {
-			$unikey=$entry;
-		    }
-		    $unikey.=&add_prefix_and_part($prefix,$token->[2]->{'part'});
-
-		    if (defined($token->[2]->{'id'})) { 
-			$unikey.='_'.$token->[2]->{'id'}; 
-		    }
+		    my $unikey='';
 
 		    if ($entry eq 'import') {
 #
 # Importing a library here
 #
+                        my $location=$parser->get_text('/import');
+                        my $dir=$filename;
+                        $dir=~s|[^/]*$||;
+                        $location=&filelocation($dir,$location);
+                       
+                        my $importmode=$token->[2]->{'importmode'};
+                        if ($importmode eq 'problem') {
+# Import as problem/response
+                           $unikey=&add_prefix_and_part($prefix,$token->[2]->{'part'});
+                        } elsif ($importmode eq 'part') {
+# Import as part(s)
+                           $importedparts=1;
+# We need to get the original file and the imported file to get the part order correct
+# Good news: we do not need to worry about nested libraries, since parts cannot be nested
+# Load and inspect original file
+                           if ($#origfileimportpartids<0) {
+                              undef(%importedpartids);
+                              my $origfilelocation=$perlvar{'lonDocRoot'}.&clutter($uri);
+                              my $origfile=&getfile($origfilelocation);
+                              @origfileimportpartids=($origfile=~/<(part|import)[^>]*id\s*=\s*[\"\']([^\"\']+)[\"\'][^>]*>/gs);
+                           }
+
+# Load and inspect imported file
+                           my $impfile=&getfile($location);
+                           my @impfilepartids=($impfile=~/<part[^>]*id\s*=\s*[\"\']([^\"\']+)[\"\'][^>]*>/gs);
+                           if ($#impfilepartids>=0) {
+# This problem had parts
+                               $importedpartids{$token->[2]->{'id'}}=join(',',@impfilepartids);
+                           } else {
+# Importing by turning a single problem into a problem part
+# It gets the import-tags ID as part-ID
+                               $unikey=&add_prefix_and_part($prefix,$token->[2]->{'id'});
+                               $importedpartids{$token->[2]->{'id'}}=$token->[2]->{'id'};
+                           }
+                        } else {
+# Normal import
+                           $unikey=&add_prefix_and_part($prefix,$token->[2]->{'part'});
+                           if (defined($token->[2]->{'id'})) {
+                              $unikey.='_'.$token->[2]->{'id'};
+                           }
+                        }
+
 			if ($depthcount<20) {
-			    my $location=$parser->get_text('/import');
-			    my $dir=$filename;
-			    $dir=~s|[^/]*$||;
-			    $location=&filelocation($dir,$location);
 			    my $metadata = 
 				&metadata($uri,'keys', $location,$unikey,
 					  $depthcount+1);
@@ -7494,9 +10077,16 @@ sub metadata {
 				$metaentry{':'.$meta}=$metaentry{':'.$meta};
 				$metathesekeys{$meta}=1;
 			    }
-			}
-		    } else { 
 			
+                        }
+		    } else {
+#
+# Not importing, some other kind of non-package, non-library start tag
+# 
+                        $unikey=$entry.&add_prefix_and_part($prefix,$token->[2]->{'part'});
+                        if (defined($token->[2]->{'id'})) {
+                            $unikey.='_'.$token->[2]->{'id'};
+                        }
 			if (defined($token->[2]->{'name'})) { 
 			    $unikey.='_'.$token->[2]->{'name'}; 
 			}
@@ -7570,6 +10160,22 @@ sub metadata {
 	    grep { ! $seen{$_} ++ } (split(',',$metaentry{':packages'}));
 	$metaentry{':packages'} = join(',',@uniq_packages);
 
+        if ($importedparts) {
+# We had imported parts and need to rebuild partorder
+           $metaentry{':partorder'}='';
+           $metathesekeys{'partorder'}=1;
+           for (my $index=0;$index<$#origfileimportpartids;$index+=2) {
+               if ($origfileimportpartids[$index] eq 'part') {
+# original part, part of the problem
+                  $metaentry{':partorder'}.=','.$origfileimportpartids[$index+1];
+               } else {
+# we have imported parts at this position
+                  $metaentry{':partorder'}.=','.$importedpartids{$origfileimportpartids[$index+1]};
+               }
+           }
+           $metaentry{':partorder'}=~s/^\,//;
+        }
+
 	$metaentry{':keys'} = join(',',keys(%metathesekeys));
 	&metadata_generate_part0(\%metathesekeys,\%metaentry,$uri);
 	$metaentry{':allpossiblekeys'}=join(',',keys %metathesekeys);
@@ -7642,6 +10248,11 @@ sub devalidate_title_cache {
     &devalidate_cache_new('title',$key);
 }
 
+# ------------------------------------------------- Get the title of a course
+
+sub current_course_title {
+    return $env{ 'course.' . $env{'request.course.id'} . '.description' };
+}
 # ------------------------------------------------- Get the title of a resource
 
 sub gettitle {
@@ -7667,6 +10278,10 @@ sub gettitle {
 	}
 	$title=~s/\&colon\;/\:/gs;
 	if ($title) {
+# Remember both $symb and $title for dynamic metadata
+            $accesshash{$symb.'___crstitle'}=$title;
+            $accesshash{&declutter($map).'___'.&declutter($url).'___usage'}=time;
+# Cache this title and then return it
 	    return &do_cache_new('title',$key,$title,600);
 	}
 	$urlsymb=$url;
@@ -7676,6 +10291,78 @@ sub gettitle {
     return $title;
 }
 
+sub getdocspath {
+    my ($symb) = @_;
+    my $path;
+    if ($symb) {
+        my ($mapurl,$id,$resurl) = &decode_symb($symb);
+        if ($resurl=~/\.(sequence|page)$/) {
+            $mapurl=$resurl;
+        } elsif ($resurl eq 'adm/navmaps') {
+            $mapurl=$env{'course.'.$env{'request.course.id'}.'.url'};
+        }
+        my $mapresobj;
+        my $navmap = Apache::lonnavmaps::navmap->new();
+        if (ref($navmap)) {
+            $mapresobj = $navmap->getResourceByUrl($mapurl);
+        }
+        $mapurl=~s{^.*/([^/]+)\.(\w+)$}{$1};
+        my $type=$2;
+        if (ref($mapresobj)) {
+            my $pcslist = $mapresobj->map_hierarchy();
+            if ($pcslist ne '') {
+                foreach my $pc (split(/,/,$pcslist)) {
+                    next if ($pc <= 1);
+                    my $res = $navmap->getByMapPc($pc);
+                    if (ref($res)) {
+                        my $thisurl = $res->src();
+                        $thisurl=~s{^.*/([^/]+)\.\w+$}{$1};
+                        my $thistitle = $res->title();
+                        $path .= '&'.
+                                 &Apache::lonhtmlcommon::entity_encode($thisurl).'&'.
+                                 &Apache::lonhtmlcommon::entity_encode($thistitle).
+                                 ':'.$res->randompick().
+                                 ':'.$res->randomout().
+                                 ':'.$res->encrypted().
+                                 ':'.$res->randomorder().
+                                 ':'.$res->is_page();
+                    }
+                }
+            }
+            $path =~ s/^\&//;
+            my $maptitle = $mapresobj->title();
+            if ($mapurl eq 'default') {
+                $maptitle = 'Main Course Documents';
+            }
+            $path .= ($path ne '')? '&' : ''.
+                    &Apache::lonhtmlcommon::entity_encode($mapurl).'&'.
+                    &Apache::lonhtmlcommon::entity_encode($maptitle).
+                    ':'.$mapresobj->randompick().
+                    ':'.$mapresobj->randomout().
+                    ':'.$mapresobj->encrypted().
+                    ':'.$mapresobj->randomorder().
+                    ':'.$mapresobj->is_page();
+        } else {
+            my $maptitle = &gettitle($mapurl);
+            my $ispage;
+            if ($mapurl =~ /\.page$/) {
+                $ispage = 1;
+            }
+            if ($mapurl eq 'default') {
+                $maptitle = 'Main Course Documents';
+            }
+            $path = &Apache::lonhtmlcommon::entity_encode($mapurl).'&'.
+                    &Apache::lonhtmlcommon::entity_encode($maptitle).':::::'.$ispage;
+        }
+        unless ($mapurl eq 'default') {
+            $path = 'default&'.
+                    &Apache::lonhtmlcommon::entity_encode('Main Course Documents').
+                    ':::::&'.$path;
+        }
+    }
+    return $path;
+}
+
 sub get_slot {
     my ($which,$cnum,$cdom)=@_;
     if (!$cnum || !$cdom) {
@@ -7699,6 +10386,84 @@ sub get_slot {
     }
     return $slotinfo{$which};
 }
+
+sub get_reservable_slots {
+    my ($cnum,$cdom,$uname,$udom) = @_;
+    my $now = time;
+    my $reservable_info;
+    my $key=join("\0",'reservableslots',$cdom,$cnum,$uname,$udom);
+    if (exists($remembered{$key})) {
+        $reservable_info = $remembered{$key};
+    } else {
+        my %resv;
+        ($resv{'now_order'},$resv{'now'},$resv{'future_order'},$resv{'future'}) =
+        &Apache::loncommon::get_future_slots($cnum,$cdom,$now);
+        $reservable_info = \%resv;
+        $remembered{$key} = $reservable_info;
+    }
+    return $reservable_info;
+}
+
+sub get_course_slots {
+    my ($cnum,$cdom) = @_;
+    my $hashid=$cnum.':'.$cdom;
+    my ($result,$cached) = &Apache::lonnet::is_cached_new('allslots',$hashid);
+    if (defined($cached)) {
+        if (ref($result) eq 'HASH') {
+            return %{$result};
+        }
+    } else {
+        my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
+        my ($tmp) = keys(%slots);
+        if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
+            &Apache::lonnet::do_cache_new('allslots',$hashid,\%slots,600);
+            return %slots;
+        }
+    }
+    return;
+}
+
+sub devalidate_slots_cache {
+    my ($cnum,$cdom)=@_;
+    my $hashid=$cnum.':'.$cdom;
+    &devalidate_cache_new('allslots',$hashid);
+}
+
+sub get_coursechange {
+    my ($cdom,$cnum) = @_;
+    if ($cdom eq '' || $cnum eq '') {
+        return unless ($env{'request.course.id'});
+        $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+        $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+    }
+    my $hashid=$cdom.'_'.$cnum;
+    my ($change,$cached)=&is_cached_new('crschange',$hashid);
+    if ((defined($cached)) && ($change ne '')) {
+        return $change;
+    } else {
+        my %crshash;
+        %crshash = &get('environment',['internal.contentchange'],$cdom,$cnum);
+        if ($crshash{'internal.contentchange'} eq '') {
+            $change = $env{'course.'.$cdom.'_'.$cnum.'.internal.created'};
+            if ($change eq '') {
+                %crshash = &get('environment',['internal.created'],$cdom,$cnum);
+                $change = $crshash{'internal.created'};
+            }
+        } else {
+            $change = $crshash{'internal.contentchange'};
+        }
+        my $cachetime = 600;
+        &do_cache_new('crschange',$hashid,$change,$cachetime);
+    }
+    return $change;
+}
+
+sub devalidate_coursechange_cache {
+    my ($cnum,$cdom)=@_;
+    my $hashid=$cnum.':'.$cdom;
+    &devalidate_cache_new('crschange',$hashid);
+}
+
 # ------------------------------------------------- Update symbolic store links
 
 sub symblist {
@@ -7708,7 +10473,7 @@ sub symblist {
     if (($env{'request.course.fn'}) && (%newhash)) {
         if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db',
                       &GDBM_WRCREAT(),0640)) {
-	    foreach my $url (keys %newhash) {
+	    foreach my $url (keys(%newhash)) {
 		next if ($url eq 'last_known'
 			 && $env{'form.no_update_last_known'});
 		$hash{declutter($url)}=&encode_symb($mapname,
@@ -7726,7 +10491,7 @@ sub symblist {
 # --------------------------------------------------------------- Verify a symb
 
 sub symbverify {
-    my ($symb,$thisurl)=@_;
+    my ($symb,$thisurl,$encstate)=@_;
     my $thisfn=$thisurl;
     $thisfn=&declutter($thisfn);
 # direct jump to resource in page or to a sequence - will construct own symbs
@@ -7745,20 +10510,43 @@ sub symbverify {
 
     if (tie(%bighash,'GDBM_File',$env{'request.course.fn'}.'.db',
                             &GDBM_READER(),0640)) {
-        my $ids=$bighash{'ids_'.&clutter($thisurl)};
-        unless ($ids) { 
-           $ids=$bighash{'ids_/'.$thisurl};
+        my $noclutter;
+        if (($thisurl =~ m{^/adm/wrapper/ext/}) || ($thisurl =~ m{^ext/})) {
+            $thisurl =~ s/\?.+$//;
+            if ($map =~ m{^uploaded/.+\.page$}) {
+                $thisurl =~ s{^(/adm/wrapper|)/ext/}{http://};
+                $thisurl =~ s{^\Qhttp://https://\E}{https://};
+                $noclutter = 1;
+            }
+        }
+        my $ids;
+        if ($noclutter) {
+            $ids=$bighash{'ids_'.$thisurl};
+        } else {
+            $ids=$bighash{'ids_'.&clutter($thisurl)};
+        }
+        unless ($ids) {
+            my $idkey = 'ids_'.($thisurl =~ m{^/}? '' : '/').$thisurl;  
+            $ids=$bighash{$idkey};
         }
         if ($ids) {
 # ------------------------------------------------------------------- Has ID(s)
+            if ($thisfn =~ m{^/adm/wrapper/ext/}) {
+                $symb =~ s/\?.+$//;
+            }
 	    foreach my $id (split(/\,/,$ids)) {
 	       my ($mapid,$resid)=split(/\./,$id);
                if (
   &symbclean(&declutter($bighash{'map_id_'.$mapid}).'___'.$resid.'___'.$thisfn)
-   eq $symb) { 
+   eq $symb) {
+                   if (ref($encstate)) {
+                       $$encstate = $bighash{'encrypted_'.$id};
+                   }
 		   if (($env{'request.role.adv'}) ||
-		       $bighash{'encrypted_'.$id} eq $env{'request.enc'}) {
-		       $okay=1; 
+		       ($bighash{'encrypted_'.$id} eq $env{'request.enc'}) ||
+                       ($thisurl eq '/adm/navmaps')) {
+		       $okay=1;
+                       last;
 		   }
 	       }
 	   }
@@ -7834,10 +10622,14 @@ sub deversion {
 
 sub symbread {
     my ($thisfn,$donotrecurse)=@_;
-    my $cache_str='request.symbread.cached.'.$thisfn;
-    if (defined($env{$cache_str})) { return $env{$cache_str}; }
+    my $cache_str;
+    if ($thisfn ne '') {
+        $cache_str='request.symbread.cached.'.$thisfn;
+        if ($env{$cache_str} ne '') {
+            return $env{$cache_str};
+        }
+    } else {
 # no filename provided? try from environment
-    unless ($thisfn) {
         if ($env{'request.symb'}) {
 	    return $env{$cache_str}=&symbclean($env{'request.symb'});
 	}
@@ -8032,19 +10824,44 @@ sub getCODE {
     }
     return undef;
 }
-
+#
+#  Determines the random seed for a specific context:
+#
+# parameters:
+#   symb      - in course context the symb for the seed.
+#   course_id - The course id of the form domain_coursenum.
+#   domain    - Domain for the user.
+#   course    - Course for the user.
+#   cenv      - environment of the course.
+#
+# NOTE:
+#   All parameters are picked out of the environment if missing
+#   or not defined.
+#   If a symb cannot be determined the current time is used instead.
+#
+#  For a given well defined symb, courside, domain, username,
+#  and course environment, the seed is reproducible.
+#
 sub rndseed {
-    my ($symb,$courseid,$domain,$username)=@_;
+    my ($symb,$courseid,$domain,$username, $cenv)=@_;
     my ($wsymb,$wcourseid,$wdomain,$wusername)=&whichuser();
     if (!defined($symb)) {
 	unless ($symb=$wsymb) { return time; }
     }
-    if (!$courseid) { $courseid=$wcourseid; }
-    if (!$domain) { $domain=$wdomain; }
-    if (!$username) { $username=$wusername }
-    my $which=&get_rand_alg();
+    if (!defined $courseid) { 
+	$courseid=$wcourseid; 
+    }
+    if (!defined $domain) { $domain=$wdomain; }
+    if (!defined $username) { $username=$wusername }
 
+    my $which;
+    if (defined($cenv->{'rndseed'})) {
+	$which = $cenv->{'rndseed'};
+    } else {
+	$which =&get_rand_alg($courseid);
+    }
     if (defined(&getCODE())) {
+
 	if ($which eq '64bit5') {
 	    return &rndseed_CODE_64bit5($symb,$courseid,$domain,$username);
 	} elsif ($which eq '64bit4') {
@@ -8368,8 +11185,9 @@ sub getfile {
 
 sub repcopy_userfile {
     my ($file)=@_;
-    if ($file =~ m -^/*(uploaded|editupload)/-) { $file=&filelocation("",$file); }
-    if ($file =~ m|^/home/httpd/html/lonUsers/|) { return 'ok'; }
+    my $londocroot = $perlvar{'lonDocRoot'};
+    if ($file =~ m{^/*(uploaded|editupload)/}) { $file=&filelocation("",$file); }
+    if ($file =~ m{^\Q/home/httpd/lonUsers/\E}) { return 'ok'; }
     my ($cdom,$cnum,$filename) = 
 	($file=~m|^\Q$perlvar{'lonDocRoot'}\E/+userfiles/+($match_domain)/+($match_name)/+(.*)|);
     my $uri="/uploaded/$cdom/$cnum/$filename";
@@ -8498,13 +11316,7 @@ sub filelocation {
 	$file=~s-^/adm/coursedocs/showdoc/-/-;
     }
 
-    if ($file=~m:^/~:) { # is a contruction space reference
-        $location = $file;
-        $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
-    } elsif ($file=~m{^/home/$match_username/public_html/}) {
-	# is a correct contruction space reference
-        $location = $file;
-    } elsif ($file =~ m-^\Q$Apache::lonnet::perlvar{'lonTabDir'}\E/-) {
+    if ($file =~ m-^\Q$Apache::lonnet::perlvar{'lonTabDir'}\E/-) {
         $location = $file;
     } elsif ($file=~/^\/*(uploaded|editupload)/) { # is an uploaded file
         my ($udom,$uname,$filename)=
@@ -8514,7 +11326,7 @@ sub filelocation {
         my @ids=&current_machine_ids();
         foreach my $id (@ids) { if ($id eq $home) { $is_me=1; } }
         if ($is_me) {
-  	    $location=&propath($udom,$uname).'/userfiles/'.$filename;
+  	    $location=propath($udom,$uname).'/userfiles/'.$filename;
         } else {
   	  $location=$Apache::lonnet::perlvar{'lonDocRoot'}.'/userfiles/'.
   	      $udom.'/'.$uname.'/'.$filename;
@@ -8523,11 +11335,12 @@ sub filelocation {
 	$location = $perlvar{'lonDocRoot'}.'/'.$file;
     } else {
         $file=~s/^\Q$perlvar{'lonDocRoot'}\E//;
-        $file=~s:^/res/:/:;
+        $file=~s:^/(res|priv)/:/:;
+        my $space=$1;
         if ( !( $file =~ m:^/:) ) {
             $location = $dir. '/'.$file;
         } else {
-            $location = '/home/httpd/html/res'.$file;
+            $location = $perlvar{'lonDocRoot'}.'/'.$space.$file;
         }
     }
     $location=~s://+:/:g; # remove duplicate /
@@ -8552,11 +11365,9 @@ sub hreflocation {
     }
     if ($file=~m-^\Q$perlvar{'lonDocRoot'}\E-) {
 	$file=~s-^\Q$perlvar{'lonDocRoot'}\E--;
-    } elsif ($file=~m-/home/($match_username)/public_html/-) {
-	$file=~s-^/home/($match_username)/public_html/-/~$1/-;
     } elsif ($file=~m-^\Q$perlvar{'lonUsersDir'}\E-) {
-	$file=~s-^/home/httpd/lonUsers/($match_domain)/./././($match_name)/userfiles/
-	    -/uploaded/$1/$2/-x;
+	$file=~s{^/home/httpd/lonUsers/($match_domain)/./././($match_name)/userfiles/}
+	        {/uploaded/$1/$2/}x;
     }
     if ($file=~ m{^/userfiles/}) {
 	$file =~ s{^/userfiles/}{/uploaded/};
@@ -8564,6 +11375,10 @@ sub hreflocation {
     return $file;
 }
 
+
+
+
+
 sub current_machine_domains {
     return &machine_domains(&hostname($perlvar{'lonHostID'}));
 }
@@ -8629,7 +11444,10 @@ sub declutter {
     $thisfn=~s|^adm/wrapper/||;
     $thisfn=~s|^adm/coursedocs/showdoc/||;
     $thisfn=~s/^res\///;
-    $thisfn=~s/\?.+$//;
+    $thisfn=~s/^priv\///;
+    unless (($thisfn =~ /^ext/) || ($thisfn =~ /\.(page|sequence)___\d+___ext/)) {
+        $thisfn=~s/\?.+$//;
+    }
     return $thisfn;
 }
 
@@ -8641,8 +11459,8 @@ sub clutter {
 	|| $thisfn =~ m{^/adm/(includes|pages)} ) { 
        $thisfn='/res'.$thisfn; 
     }
-    if ($thisfn !~m|/adm|) {
-	if ($thisfn =~ m|/ext/|) {
+    if ($thisfn !~m|^/adm|) {
+	if ($thisfn =~ m|^/ext/|) {
 	    $thisfn='/adm/wrapper'.$thisfn;
 	} else {
 	    my ($ext) = ($thisfn =~ /\.(\w+)$/);
@@ -8750,6 +11568,7 @@ sub get_dns {
     while (%alldns) {
 	my ($dns) = keys(%alldns);
 	my $ua=new LWP::UserAgent;
+        $ua->timeout(30);
 	my $request=new HTTP::Request('GET',"$alldns{$dns}://$dns$url");
 	my $response=$ua->request($request);
         delete($alldns{$dns});
@@ -8833,14 +11652,21 @@ sub get_dns {
     my %libserv;
     my $loaded;
     my %name_to_host;
+    my %internetdom;
+    my %LC_dns_serv;
 
     sub parse_hosts_tab {
 	my ($file) = @_;
 	foreach my $configline (@$file) {
 	    next if ($configline =~ /^(\#|\s*$ )/x);
-	    next if ($configline =~ /^\^/);
-	    chomp($configline);
-	    my ($id,$domain,$role,$name,$protocol)=split(/:/,$configline);
+            chomp($configline);
+	    if ($configline =~ /^\^/) {
+                if ($configline =~ /^\^([\w.\-]+)/) {
+                    $LC_dns_serv{$1} = 1;
+                }
+                next;
+            }
+	    my ($id,$domain,$role,$name,$protocol,$intdom)=split(/:/,$configline);
 	    $name=~s/\s//g;
 	    if ($id && $domain && $role && $name) {
 		$hostname{$id}=$name;
@@ -8856,6 +11682,9 @@ sub get_dns {
                 } else {
                     $protocol{$id} = 'http';
                 }
+                if (defined($intdom)) {
+                    $internetdom{$id} = $intdom;
+                }
 	    }
 	}
     }
@@ -8917,6 +11746,12 @@ sub get_dns {
 	return %libserv;
     }
 
+    sub unique_library {
+	#2x reverse removes all hostnames that appear more than once
+        my %unique = reverse &all_library();
+        return reverse %unique;
+    }
+
     sub get_servers {
 	&load_hosts_tab() if (!$loaded);
 
@@ -8940,6 +11775,11 @@ sub get_dns {
 	return %result;
     }
 
+    sub get_unique_servers {
+        my %unique = reverse &get_servers(@_);
+	return reverse %unique;
+    }
+
     sub host_domain {
 	&load_hosts_tab() if (!$loaded);
 
@@ -8954,6 +11794,21 @@ sub get_dns {
 	my @uniq = grep(!$seen{$_}++, values(%hostdom));
 	return @uniq;
     }
+
+    sub internet_dom {
+        &load_hosts_tab() if (!$loaded);
+
+        my ($lonid) = @_;
+        return $internetdom{$lonid};
+    }
+
+    sub is_LC_dns {
+        &load_hosts_tab() if (!$loaded);
+
+        my ($hostname) = @_;
+        return exists($LC_dns_serv{$hostname});
+    }
+
 }
 
 { 
@@ -9046,23 +11901,65 @@ sub get_dns {
 
 	return %iphost;
     }
-}
 
-#
-#  Given a DNS returns the loncapa host name for that DNS 
-# 
-sub host_from_dns {
-    my ($dns) = @_;
-    my @hosts;
-    my $ip;
-
-    $ip = gethostbyname($dns);	# Initial translation to IP is in net order.
-    if (length($ip) == 4) { 
-	$ip   = &IO::Socket::inet_ntoa($ip);
-	@hosts = get_hosts_from_ip($ip);
-	return $hosts[0];
+    #
+    #  Given a DNS returns the loncapa host name for that DNS 
+    # 
+    sub host_from_dns {
+        my ($dns) = @_;
+        my @hosts;
+        my $ip;
+
+        if (exists($name_to_ip{$dns})) {
+            $ip = $name_to_ip{$dns};
+        }
+        if (!$ip) {
+            $ip = gethostbyname($dns); # Initial translation to IP is in net order.
+            if (length($ip) == 4) { 
+	        $ip   = &IO::Socket::inet_ntoa($ip);
+            }
+        }
+        if ($ip) {
+	    @hosts = get_hosts_from_ip($ip);
+	    return $hosts[0];
+        }
+        return undef;
+    }
+
+    sub get_internet_names {
+        my ($lonid) = @_;
+        return if ($lonid eq '');
+        my ($idnref,$cached)=
+            &Apache::lonnet::is_cached_new('internetnames',$lonid);
+        if ($cached) {
+            return $idnref;
+        }
+        my $ip = &get_host_ip($lonid);
+        my @hosts = &get_hosts_from_ip($ip);
+        my %iphost = &get_iphost();
+        my (@idns,%seen);
+        foreach my $id (@hosts) {
+            my $dom = &host_domain($id);
+            my $prim_id = &domain($dom,'primary');
+            my $prim_ip = &get_host_ip($prim_id);
+            next if ($seen{$prim_ip});
+            if (ref($iphost{$prim_ip}) eq 'ARRAY') {
+                foreach my $id (@{$iphost{$prim_ip}}) {
+                    my $intdom = &internet_dom($id);
+                    unless (grep(/^\Q$intdom\E$/,@idns)) {
+                        push(@idns,$intdom);
+                    }
+                }
+            }
+            $seen{$prim_ip} = 1;
+        }
+        return &Apache::lonnet::do_cache_new('internetnames',$lonid,\@idns,12*60*60);
     }
-    return undef;
+
+}
+
+sub all_loncaparevs {
+    return qw(1.1 1.2 1.3 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10);
 }
 
 BEGIN {
@@ -9140,9 +12037,72 @@ BEGIN {
     close($config);
 }
 
+# ---------------------------------------------------------- Read loncaparev table
+{
+    if (-e "$perlvar{'lonTabDir'}/loncaparevs.tab") {
+        if (open(my $config,"<$perlvar{'lonTabDir'}/loncaparevs.tab")) {
+            while (my $configline=<$config>) {
+                chomp($configline);
+                my ($hostid,$loncaparev)=split(/:/,$configline);
+                $loncaparevs{$hostid}=$loncaparev;
+            }
+            close($config);
+        }
+    }
+}
+
+# ---------------------------------------------------------- Read serverhostID table
+{
+    if (-e "$perlvar{'lonTabDir'}/serverhomeIDs.tab") {
+        if (open(my $config,"<$perlvar{'lonTabDir'}/serverhomeIDs.tab")) {
+            while (my $configline=<$config>) {
+                chomp($configline);
+                my ($name,$id)=split(/:/,$configline);
+                $serverhomeIDs{$name}=$id;
+            }
+            close($config);
+        }
+    }
+}
+
+{
+    my $file = $Apache::lonnet::perlvar{'lonTabDir'}.'/releaseslist.xml';
+    if (-e $file) {
+        my $parser = HTML::LCParser->new($file);
+        while (my $token = $parser->get_token()) {
+            if ($token->[0] eq 'S') {
+                my $item = $token->[1];
+                my $name = $token->[2]{'name'};
+                my $value = $token->[2]{'value'};
+                if ($item ne '' && $name ne '' && $value ne '') {
+                    my $release = $parser->get_text();
+                    $release =~ s/(^\s*|\s*$ )//gx;
+                    $needsrelease{$item.':'.$name.':'.$value} = $release;
+                }
+            }
+        }
+    }
+}
+
+# ---------------------------------------------------------- Read managers table
+{
+    if (-e "$perlvar{'lonTabDir'}/managers.tab") {
+        if (open(my $config,"<$perlvar{'lonTabDir'}/managers.tab")) {
+            while (my $configline=<$config>) {
+                chomp($configline);
+                next if ($configline =~ /^\#/);
+                if (($configline =~ /^[\w\-]+$/) || ($configline =~ /^[\w\-]+\:[\w\-]+$/)) {
+                    $managerstab{$configline} = 1;
+                }
+            }
+            close($config);
+        }
+    }
+}
+
 # ------------- set up temporary directory
 {
-    $tmpdir = $perlvar{'lonDaemons'}.'/tmp/';
+    $tmpdir = LONCAPA::tempdir();
 
 }
 
@@ -9370,9 +12330,14 @@ authentication scheme
 
 =item *
 X<authenticate()>
-B<authenticate($uname,$upass,$udom)>: try to
+B<authenticate($uname,$upass,$udom,$checkdefauth,$clientcancheckhost)>: try to
 authenticate user from domain's lib servers (first use the current
 one). C<$upass> should be the users password.
+$checkdefauth is optional (value is 1 if a check should be made to
+   authenticate user using default authentication method, and allow
+   account creation if username does not have account in the domain).
+$clientcancheckhost is optional (value is 1 if checking whether the
+   server can host will occur on the client side in lonauth.pm).   
 
 =item *
 X<homeserver()>
@@ -9398,7 +12363,13 @@ B<idput($udom,%ids)>: store away a list
 
 =item *
 X<rolesinit()>
-B<rolesinit($udom,$username,$authhost)>: get user privileges
+B<rolesinit($udom,$username)>: get user privileges.
+returns user role, first access and timer interval hashes
+
+=item *
+X<privileged()>
+B<privileged($username,$domain)>: returns a true if user has a
+privileged and active role (i.e. su or dc), false otherwise.
 
 =item *
 X<getsection()>
@@ -9439,6 +12410,21 @@ allowed($priv,$uri,$symb,$role) : check
 
 =item *
 
+constructaccess($url,$setpriv) : check for access to construction space URL
+
+See if the owner domain and name in the URL match those in the
+expected environment.  If so, return three element list
+($ownername,$ownerdomain,$ownerhome).
+
+Otherwise return the null string.
+
+If second argument 'setpriv' is true, it assigns the privileges,
+and returns the same three element list, unless the owner has
+blocked "ad hoc" Domain Coordinator access to the Author Space,
+in which case the null string is returned.
+
+=item *
+
 definerole($rolename,$sysrole,$domrole,$courole) : define role; define a custom
 role rolename set privileges in format of lonTabs/roles.tab for system, domain,
 and course level
@@ -9447,7 +12433,7 @@ and course level
 
 plaintext($short,$type,$cid,$forcedefault) : return value in %prp hash 
 (rolesplain.tab); plain text explanation of a user role term.
-$type is Course (default) or Group.
+$type is Course (default) or Community.
 If $forcedefault evaluates to true, text returned will be default 
 text for $type. Otherwise, if this is a course, the text returned 
 will be a custom name for the role (if defined in the course's 
@@ -9469,6 +12455,17 @@ of role statuses (active, future or prev
 to restrict the list of roles reported. If no array ref is 
 provided for types, will default to return only active roles.
 
+=item *
+
+in_course($udom,$uname,$cdom,$cnum,$type,$hideprivileged) : determine if
+user: $uname:$udom has a role in the course: $cdom_$cnum. 
+
+Additional optional arguments are: $type (if role checking is to be restricted 
+to certain user status types -- previous (expired roles), active (currently
+available roles) or future (roles available in the future), and
+$hideprivileged -- if true will not report course roles for users who
+have active Domain Coordinator or Super User roles.
+
 =back
 
 =head2 User Modification
@@ -9494,9 +12491,16 @@ modifyuserauth($udom,$uname,$umode,$upas
 
 =item *
 
-modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last,$gene,
-           $forceid,$desiredhome,$email,$inststatus) : 
-modify user
+modifyuser($udom,$uname,$uid,$umode,$upass,$first,$middle,$last, $gene,
+           $forceid,$desiredhome,$email,$inststatus,$candelete) :
+
+will update user information (firstname,middlename,lastname,generation,
+permanentemail), and if forceid is true, student/employee ID also.
+A user's institutional affiliation(s) can also be updated.
+User information fields will not be overwritten with empty entries 
+unless the field is included in the $candelete array reference.
+This array is included when a single user is modified via "Manage Users",
+or when Autoupdate.pl is run by cron in a domain.
 
 =item *
 
@@ -9624,11 +12628,32 @@ revokecustomrole($udom,$uname,$url,$role
 
 =item *
 
-coursedescription($courseid) : returns a hash of information about the
+coursedescription($courseid,$options) : returns a hash of information about the
 specified course id, including all environment settings for the
 course, the description of the course will be in the hash under the
 key 'description'
 
+$options is an optional parameter that if supplied is a hash reference that controls
+what how this function works.  It has the following key/values:
+
+=over 4
+
+=item freshen_cache
+
+If defined, and the environment cache for the course is valid, it is 
+returned in the returned hash.
+
+=item one_time
+
+If defined, the last cache time is set to _now_
+
+=item user
+
+If defined, the supplied username is used instead of the current user.
+
+
+=back
+
 =item *
 
 resdata($name,$domain,$type,@which) : request for current parameter
@@ -9643,7 +12668,6 @@ data base, returning a hash that is keye
 values that are the resource value.  I believe that the timestamps and
 versions are also returned.
 
-
 =back
 
 =head2 Course Modification
@@ -9657,7 +12681,24 @@ database) for a course
 
 =item *
 
-createcourse($udom,$description,$url) : make/modify course
+createcourse($udom,$description,$url,$course_server,$nonstandard,$inst_code,$course_owner,$crstype,$cnum) : make course
+
+=item *
+
+generate_coursenum($udom,$crstype) : get a unique (unused) course number in domain $udom for course type $crstype (Course or Community).
+
+=item *
+
+is_course($courseid), is_course($cdom, $cnum)
+
+Accepts either a combined $courseid (in the form of domain_courseid) or the
+two component version $cdom, $cnum. It checks if the specified course exists.
+
+Returns:
+    undef if the course doesn't exist, otherwise
+    in scalar context the combined courseid.
+    in list context the two components of the course identifier, domain and 
+    courseid.    
 
 =back
 
@@ -9727,12 +12768,14 @@ returns the data handle
 
 =item *
 
-symbverify($symb,$thisfn) : verifies that $symb actually exists and is
-a possible symb for the URL in $thisfn, and if is an encryypted
+symbverify($symb,$thisfn,$encstate) : verifies that $symb actually exists
+and is a possible symb for the URL in $thisfn, and if is an encrypted
 resource that the user accessed using /enc/ returns a 1 on success, 0
-on failure, user must be in a course, as it assumes the existance of
-the course initial hash, and uses $env('request.course.id'}
-
+on failure, user must be in a course, as it assumes the existence of
+the course initial hash, and uses $env('request.course.id'}.  The third
+arg is an optional reference to a scalar.  If this arg is passed in the 
+call to symbverify, it will be set to 1 if the symb has been set to be 
+encrypted; otherwise it will be null.  
 
 =item *
 
@@ -9785,6 +12828,34 @@ expirespread($uname,$udom,$stype,$usymb)
 devalidate($symb) : devalidate temporary spreadsheet calculations,
 forcing spreadsheet to reevaluate the resource scores next time.
 
+=item * 
+
+can_edit_resource($file,$cnum,$cdom,$resurl,$symb,$group) : determine if current user can edit a particular resource,
+when viewing in course context.
+
+ input: six args -- filename (decluttered), course number, course domain,
+                    url, symb (if registered) and group (if this is a 
+                    group item -- e.g., bulletin board, group page etc.).
+
+ output: array of five scalars --
+         $cfile -- url for file editing if editable on current server
+         $home -- homeserver of resource (i.e., for author if published,
+                                          or course if uploaded.).
+         $switchserver --  1 if server switch will be needed.
+         $forceedit -- 1 if icon/link should be to go to edit mode 
+         $forceview -- 1 if icon/link should be to go to view mode
+
+=item *
+
+is_course_upload($file,$cnum,$cdom)
+
+Used in course context to determine if current file was uploaded to 
+the course (i.e., would be found in /userfiles/docs on the course's 
+homeserver.
+
+  input: 3 args -- filename (decluttered), course number and course domain.
+  output: boolean -- 1 if file was uploaded.
+
 =back
 
 =head2 Storing/Retreiving Data
@@ -9955,7 +13026,82 @@ or lonTabs/domain.tab.
 
 =item *
 
-dirlist($uri) : return directory list based on URI
+dirlist() : return directory list based on URI (first arg).
+
+Inputs: 1 required, 5 optional.
+
+=over
+
+=item 
+$uri - path to file in filesystem (starts: /res or /userfiles/). Required.
+
+=item
+$userdomain - domain of user/course to be listed. Extracted from $uri if absent. 
+
+=item
+$username -  username of user/course to be listed. Extracted from $uri if absent. 
+
+=item
+$getpropath - boolean: 1 if prepend path using &propath(). 
+
+=item
+$getuserdir - boolean: 1 if prepend path for "userfiles".
+
+=item 
+$alternateRoot - path to prepend in place of path from $uri.
+
+=back
+
+Returns: Array of up to two items.
+
+=over
+
+a reference to an array of files/subdirectories
+
+=over
+
+Each element in the array of files/subdirectories is a & separated list of
+item name and the result of running stat on the item.  If dirlist was requested
+for a file instead of a directory, the item name will be ''. For a directory 
+listing, if the item is a metadata file, the element will end &N&M 
+(where N amd M are either 0 or 1, corresponding to obsolete set (1), or
+default copyright set (1).  
+
+=back
+
+a scalar containing error condition (if encountered).
+
+=over
+
+=item 
+no_host (no homeserver identified for $username:$domain).
+
+=item 
+no_such_host (server contacted for listing not identified as valid host).
+
+=item 
+con_lost (connection to remote server failed).
+
+=item 
+refused (invalid $username:$domain received on lond side).
+
+=item 
+no_such_dir (directory at specified path on lond side does not exist). 
+
+=item 
+empty (directory at specified path on lond side is empty).
+
+=over
+
+This is currently not encountered because the &ls3, &ls2, 
+&ls (_handler) routines on the lond side do not filter out
+. and .. from a directory listing. 
+
+=back
+
+=back
+
+=back
 
 =item *
 
@@ -10017,11 +13163,12 @@ splitting on '&', supports elements that
 
 =head2 Logging Routines
 
-=over 4
 
 These routines allow one to make log messages in the lonnet.log and
 lonnet.perm logfiles.
 
+=over 4
+
 =item *
 
 logtouch() : make sure the logfile, lonnet.log, exists
@@ -10037,6 +13184,7 @@ logperm() : append a permanent message t
 file never gets deleted by any automated portion of the system, only
 messages of critical importance should go in here.
 
+
 =back
 
 =head2 General File Helper Routines
@@ -10110,8 +13258,10 @@ userfileupload(): main rotine for puttin
            filename, and the contents of the file to create/modifed exist
            the filename is in $env{'form.'.$formname.'.filename'} and the
            contents of the file is located in $env{'form.'.$formname}
- coursedoc - if true, store the file in the course of the active role
-             of the current user
+ context - if coursedoc, store the file in the course of the active role
+             of the current user; 
+           if 'existingfile': store in 'overwrites' in /home/httpd/perl/tmp
+           if 'canceloverwrite': delete file in tmp/overwrites directory
  subdir - required - subdirectory to put the file in under ../userfiles/
          if undefined, it will be placed in "unknown"
 
@@ -10133,16 +13283,29 @@ returns: the new clean filename
 
 =item *
 
-finishuserfileupload(): routine that creaes and sends the file to
+finishuserfileupload(): routine that creates and sends the file to
 userspace, probably shouldn't be called directly
 
   docuname: username or courseid of destination for the file
   docudom: domain of user/course of destination for the file
   formname: same as for userfileupload()
-  fname: filename (inculding subdirectories) for the file
+  fname: filename (including subdirectories) for the file
+  parser: if 'parse', will parse (html) file to extract references to objects, links etc.
+  allfiles: reference to hash used to store objects found by parser
+  codebase: reference to hash used for codebases of java objects found by parser
+  thumbwidth: width (pixels) of thumbnail to be created for uploaded image
+  thumbheight: height (pixels) of thumbnail to be created for uploaded image
+  resizewidth: width to be used to resize image using resizeImage from ImageMagick
+  resizeheight: height to be used to resize image using resizeImage from ImageMagick
+  context: if 'overwrite', will move the uploaded file from its temporary location to
+            userfiles to facilitate overwriting a previously uploaded file with same name.
+  mimetype: reference to scalar to accommodate mime type determined
+            from File::MMagic if $parser = parse.
 
  returns either the url of the uploaded file (/uploaded/....) if successful
- and /adm/notfound.html if unsuccessful
+ and /adm/notfound.html if unsuccessful (or an error message if context 
+ was 'overwrite').
+ 
 
 =item *
 
@@ -10248,6 +13411,8 @@ Internal notes:
  
  Locks on files (resulting from submission of portfolio file to a homework problem stored in array of arrays.
 
+=item *
+
 modify_access_controls():
 
 Modifies access controls for a portfolio file
@@ -10265,7 +13430,51 @@ Returns:
 3. reference to hash of any new or updated access controls.
 4. reference to hash used to map incoming IDs to uniqueIDs assigned to control.
    key = integer (inbound ID)
-   value = uniqueID  
+   value = uniqueID
+
+=item *
+
+get_timebased_id():
+
+Attempts to get a unique timestamp-based suffix for use with items added to a 
+course via the Course Editor (e.g., folders, composite pages, 
+group bulletin boards).
+
+Args: (first three required; six others optional)
+
+1. prefix (alphanumeric): of keys in hash, e.g., suppsequence, docspage,
+   docssequence, or name of group
+
+2. keyid (alphanumeric): name of temporary locking key in hash,
+   e.g., num, boardids
+
+3. namespace: name of gdbm file used to store suffixes already assigned;  
+   file will be named nohist_namespace.db
+
+4. cdom: domain of course; default is current course domain from %env
+
+5. cnum: course number; default is current course number from %env
+
+6. idtype: set to concat if an additional digit is to be appended to the 
+   unix timestamp to form the suffix, if the plain timestamp is already
+   in use.  Default is to not do this, but simply increment the unix 
+   timestamp by 1 until a unique key is obtained.
+
+7. who: holder of locking key; defaults to user:domain for user.
+
+8. locktries: number of attempts to obtain a lock (sleep of 1s before 
+   retrying); default is 3.
+
+9. maxtries: number of attempts to obtain a unique suffix; default is 20.  
+
+Returns:
+
+1. suffix obtained (numeric)
+
+2. result of deleting locking key (ok if deleted, or lock never obtained)
+
+3. error: contains (localized) error message if an error occurred.
+
 
 =back