--- loncom/auth/switchserver.pm	2006/11/23 01:49:41	1.10
+++ loncom/auth/switchserver.pm	2010/08/13 00:06:27	1.28.2.1
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Switch Servers Handler
 #
-# $Id: switchserver.pm,v 1.10 2006/11/23 01:49:41 albertel Exp $
+# $Id: switchserver.pm,v 1.28.2.1 2010/08/13 00:06:27 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -34,6 +34,7 @@ use Apache::lonnet;
 use Apache::lonmenu;
 use CGI::Cookie();
 use Apache::lonlocal;
+use LONCAPA qw(:DEFAULT :match);
 
 sub init_env {
     my ($r) = @_;
@@ -42,23 +43,30 @@ sub init_env {
 	return  $env{'user.environment'};
     }
     my $requrl=$r->uri;
-    my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
-    my $lonid=$cookies{'lonID'};
-    my $cookie;
-    if (!$lonid) { return undef; }
-
-    my $handle=&LONCAPA::clean_handle($lonid->value);
-    my $lonidsdir=$r->dir_config('lonIDsDir');
-    if ((!-e "$lonidsdir/$handle.id") || ($handle eq '')) {
-	$r->log_reason("Cookie $handle not valid", $r->filename); 
+    my $handle= &Apache::lonnet::check_for_valid_session($r);
+    if ($handle ne '') {
 	return undef;
     }
-
+    my $lonidsdir=$r->dir_config('lonIDsDir');
     &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
     
     return $r->dir_config('lonIDsDir')."/$handle.id";
 }
 
+sub do_redirect {
+    my ($r,$url,$only_body,$extra_text) = @_;
+    $r->send_http_header;
+    my $start_page = 
+	&Apache::loncommon::start_page('Switching Server ...',undef,
+				       {'redirect'       => [0.5,$url],
+                                        'no_inline_link' => 1,
+					'only_body'      => $only_body,});
+    my $end_page   = &Apache::loncommon::end_page();
+    $r->print($start_page.$extra_text.$end_page);
+    return OK;
+
+}
+
 sub handler {
     my ($r) = @_;
     
@@ -66,18 +74,69 @@ sub handler {
     if (!defined($handle)) { return FORBIDDEN; }
 
     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
-					    ['otherserver','role']);
+				['otherserver','role','origurl','symb']);
 
-    my $switch_to=$Apache::lonnet::hostname{$env{'form.otherserver'}};
-    if (!$env{'form.otherserver'}) {
-	$env{'form.otherserver'}=&Apache::lonnet::spareserver(30000,undef,1);
-	$switch_to=$Apache::lonnet::hostname{$env{'form.otherserver'}};
+    my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
+    if (! $env{'form.otherserver'}) {
+	$env{'form.otherserver'} =	
+	    &Apache::lonnet::find_existing_session($env{'user.domain'},
+						   $env{'user.name'});
+	if (! $env{'form.otherserver'}) {
+	    $env{'form.otherserver'} = 
+		&Apache::lonnet::spareserver(30000,undef,1);
+	}
+	$switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
     }
 
     if (!defined($switch_to)) { return FORBIDDEN; }
 
-    if ($env{'form.role'} && 
-	!exists($env{'user.role.'.$env{'form.role'}})) { return FORBIDDEN; }
+    if ($env{'user.name'} eq 'public'
+	&& $env{'user.domain'} eq 'public') {
+	my $url = 'http://'.$switch_to.$r->uri;
+	return &do_redirect($r,$url,1)
+    }
+
+    my $skip_canhost_check = '';
+    if ($env{'form.role'}) {
+        if (!exists($env{'user.role.'.$env{'form.role'}})) {
+            return FORBIDDEN;
+        } else {
+            my $now = time;
+            my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.role'}});
+            if (($start && $start > $now) || ($end && $end < $now)) {
+                return FORBIDDEN;
+            } elsif ($env{'form.role'} eq 'au./'.$env{'user.domain'}.'/') {
+                if (&Apache::lonnet::homeserver($env{'user.name'},$env{'user.domain'}) eq $env{'form.otherserver'}) {
+                    $skip_canhost_check = 1;
+                }
+            } elsif ($env{'form.role'} =~ m{^[ac]a\./($match_domain)/($match_username)/$}) {
+                if (&Apache::lonnet::homeserver($2,$1) eq $env{'form.otherserver'}) {
+                    $skip_canhost_check = 1; 
+                }
+            }
+        }
+    }
+
+    unless ($skip_canhost_check) {
+        my $canhost = 1;
+        my $uprimary_id = &Apache::lonnet::domain($env{'user.domain'},'primary');
+        my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
+        my @intdoms = &Apache::lonnet::get_internet_names($env{'form.otherserver'});
+        unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
+            my $serverhomeID = &Apache::lonnet::get_server_homeID($switch_to);
+            my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
+            my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
+            my %udomdefaults = &Apache::lonnet::get_domain_defaults($env{'user.domain'});
+            my $remoterev = &Apache::lonnet::get_server_loncaparev($env{'user.domain'},$env{'form.otherserver'});
+            $canhost = 
+                &Apache::lonnet::can_host_session($env{'user.domain'},
+                                                  $env{'form.otherserver'},
+                                                  $remoterev,
+                                                  $udomdefaults{'remotesessions'},
+                                                  $defdomdefaults{'hostedsessions'});
+        }
+        unless ($canhost) { return FORBIDDEN; }
+    }
 
     #remove session env, and log event
     unlink($handle);
@@ -89,12 +148,22 @@ sub handler {
 			 "Switch Server to $env{'form.otherserver'} with role $env{'form.role'} $ENV{'REMOTE_ADDR'}");
 
     &Apache::loncommon::content_type($r,'text/html');
-    $r->send_http_header;
-    return OK if $r->header_only;
+
+    #expire the cookie
+    my $c = new CGI::Cookie(-name    => 'lonID',
+			    -value   => '',
+			    -expires => '-10y',);
+    $r->header_out('Set-cookie' => $c);
+
+    if ($r->header_only) {
+	$r->send_http_header;
+	return OK;
+    }
 # -------------------------------------------------------- Menu script and info
-	   
-    my $windowinfo=&Apache::lonmenu::close();
-    $windowinfo.=&Apache::lonnavmaps::close();
+
+    my $windowinfo=
+        &Apache::lonmenu::close().
+        &Apache::lonnavmaps::close();
 # ---------------------------------------------------------------- Get handover
 
     my %info=('ip'       => $ENV{'REMOTE_ADDR'},
@@ -102,20 +171,26 @@ sub handler {
 	      'username' => $env{'user.name'},
 	      'role'     => $env{'form.role'},
 	      'server'   => $r->dir_config('lonHostID'));
+    if ($env{'form.origurl'}) {
+        $info{'origurl'} = $env{'form.origurl'};
+    }
+    if ($env{'form.symb'}) {
+        $info{'symb'} = $env{'form.symb'};
+    }
     if ($env{'request.sso.login'}) {
 	$info{'sso.login'} = $env{'request.sso.login'};
     }
+    if ($env{'request.sso.reloginserver'}) {
+        $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
+    }
     my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
-    my $switch='<meta HTTP-EQUIV="Refresh" CONTENT="0.5; url=http://'.$switch_to.'/adm/login?domain='.$env{'user.domain'}.'&username='.$env{'user.name'}.'&token='.$token.'">';
-    my $start_page = &Apache::loncommon::start_page('Switching Server ...',
-						    $switch,
-						    {'no_inline_link' => 1,});
-    my $end_page   = &Apache::loncommon::end_page();
+    my $url ='http://'.$switch_to.'/adm/login?'.
+	'domain='.$env{'user.domain'}.
+	'&amp;username='.$env{'user.name'}.
+	'&amp;token='.$token;
 # --------------------------------------------------------------- Screen Output
-    $r->print($start_page.$windowinfo.$end_page);
-
     &Apache::lonnet::flushcourselogs();
-    return OK;
+    return &do_redirect($r,$url,0,$windowinfo);
 }
 
 1;