--- loncom/Lond.pm	2018/09/02 01:58:30	1.8.2.1
+++ loncom/Lond.pm	2022/02/20 21:06:30	1.8.2.3.2.3
@@ -1,6 +1,6 @@
 # The LearningOnline Network
 #
-# $Id: Lond.pm,v 1.8.2.1 2018/09/02 01:58:30 raeburn Exp $
+# $Id: Lond.pm,v 1.8.2.3.2.3 2022/02/20 21:06:30 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -37,7 +37,8 @@ use lib '/home/httpd/lib/perl/';
 use LONCAPA;
 use Apache::lonnet;
 use GDBM_File;
-
+use Net::OAuth;
+use Crypt::CBC;
 
 sub dump_with_regexp {
     my ( $tail, $clientversion ) = @_;
@@ -239,10 +240,10 @@ sub check_homecourses {
                     }
                 }
                 unless (&untie_domain_hash($hashref)) {
-                    &logthis("Failed to untie tied hash for nohist_courseids.db for $domain");
+                    &Apache::lonnet::logthis("Failed to untie tied hash for nohist_courseids.db for $domain");
                 }
             } else {
-                &logthis("Failed to tie hash for nohist_courseids.db for $domain");
+                &Apache::lonnet::logthis("Failed to tie hash for nohist_courseids.db for $domain");
             }
         }
         foreach my $hashid (keys(%recent)) {
@@ -314,9 +315,9 @@ sub get_courseinfo_hash {
     };
     if ($@) {
         if ($@ eq "timeout\n") {
-            &logthis("<font color='blue'>WARNING courseiddump for $cnum:$cdom from $home timedout</font>");
+            &Apache::lonnet::logthis("<font color='blue'>WARNING courseiddump for $cnum:$cdom from $home timedout</font>");
         } else {
-            &logthis("<font color='yellow'>WARNING unexpected error during eval of call for courseiddump from $home</font>");
+            &Apache::lonnet::logthis("<font color='yellow'>WARNING unexpected error during eval of call for courseiddump from $home</font>");
         }
     } else {
         if (ref($info{$cdom.'_'.$cnum}) eq 'HASH') {
@@ -802,15 +803,243 @@ sub is_course {
             }
             &Apache::lonnet::do_cache_new('iscourse',$hashid,$iscourse,3600);
             unless (&untie_domain_hash($hashref)) {
-                &logthis("Failed to untie tied hash for nohist_courseids.db for $cdom");
+                &Apache::lonnet::logthis("Failed to untie tied hash for nohist_courseids.db for $cdom");
             }
         } else {
-            &logthis("Failed to tie hash for nohist_courseids.db for $cdom");
+            &Apache::lonnet::logthis("Failed to tie hash for nohist_courseids.db for $cdom");
         }
     }
     return $iscourse;
 }
 
+sub get_dom {
+    my ($userinput) = @_;
+    my ($cmd,$udom,$namespace,$what) =split(/:/,$userinput,4);
+    my $hashref = &tie_domain_hash($udom,$namespace,&GDBM_READER()) or
+        return "error: ".($!+0)." tie(GDBM) Failed while attempting $cmd";
+    my $qresult='';
+    if (ref($hashref)) {
+        chomp($what);
+        my @queries=split(/\&/,$what);
+        for (my $i=0;$i<=$#queries;$i++) {
+            $qresult.="$hashref->{$queries[$i]}&";
+        }
+        $qresult=~s/\&$//;
+    }
+    &untie_user_hash($hashref) or
+        return "error: ".($!+0)." untie(GDBM) Failed while attempting $cmd";
+    return $qresult;
+}
+
+sub store_dom {
+    my ($userinput) = @_;
+    my ($cmd,$dom,$namespace,$rid,$what) =split(/:/,$userinput);
+    my $hashref  = &tie_domain_hash($dom,$namespace,&GDBM_WRCREAT(),"S","$rid:$what") or
+        return "error: ".($!+0)." tie(GDBM) Failed while attempting $cmd";
+    $hashref->{"version:$rid"}++;
+    my $version=$hashref->{"version:$rid"};
+    my $allkeys='';
+    my @pairs=split(/\&/,$what);
+    foreach my $pair (@pairs) {
+        my ($key,$value)=split(/=/,$pair);
+        $allkeys.=$key.':';
+        $hashref->{"$version:$rid:$key"}=$value;
+    }
+    my $now = time;
+    $hashref->{"$version:$rid:timestamp"}=$now;
+    $allkeys.='timestamp';
+    $hashref->{"$version:keys:$rid"}=$allkeys;
+    &untie_user_hash($hashref) or
+        return "error: ".($!+0)." untie(GDBM) Failed while attempting $cmd";
+    return 'ok';
+}
+
+sub restore_dom {
+    my ($userinput) = @_;
+    my ($cmd,$dom,$namespace,$rid) = split(/:/,$userinput);
+    my $hashref = &tie_domain_hash($dom,$namespace,&GDBM_READER()) or
+        return "error: ".($!+0)." tie(GDBM) Failed while attempting $cmd";
+    my $qresult='';
+    if (ref($hashref)) {
+        chomp($rid);
+        my $version=$hashref->{"version:$rid"};
+        $qresult.="version=$version&";
+        my $scope;
+        for ($scope=1;$scope<=$version;$scope++) {
+            my $vkeys=$hashref->{"$scope:keys:$rid"};
+            my @keys=split(/:/,$vkeys);
+            my $key;
+            $qresult.="$scope:keys=$vkeys&";
+            foreach $key (@keys) {
+                $qresult.="$scope:$key=".$hashref->{"$scope:$rid:$key"}."&";
+            }
+        }
+        $qresult=~s/\&$//;
+    }
+    &untie_user_hash($hashref) or
+        return "error: ".($!+0)." untie(GDBM) Failed while attempting $cmd";
+    return $qresult;
+}
+
+sub crslti_itemid {
+    my ($cdom,$cnum,$url,$method,$params,$loncaparev) = @_;
+    unless (ref($params) eq 'HASH') {
+        return;
+    }
+    if (($cdom eq '') || ($cnum eq '')) {
+        return;
+    }
+    my ($itemid,$consumer_key,$secret);
+
+    if (exists($params->{'oauth_callback'})) {
+        $Net::OAuth::PROTOCOL_VERSION = Net::OAuth::PROTOCOL_VERSION_1_0A;
+    } else {
+        $Net::OAuth::PROTOCOL_VERSION = Net::OAuth::PROTOCOL_VERSION_1_0;
+    }
+
+    my $consumer_key = $params->{'oauth_consumer_key'};
+    return if ($consumer_key eq '');
+
+    my (%crslti,%crslti_by_key);
+    my $hashid=$cdom.'_'.$cnum;
+    my ($result,$cached)=&Apache::lonnet::is_cached_new('courseltienc',$hashid);
+    if (defined($cached)) {
+        if (ref($result) eq 'HASH') {
+            %crslti = %{$result};
+        }
+    } else {
+        my $reply = &dump_with_regexp(join(":",($cdom,$cnum,'nohist_ltienc','','')),$loncaparev);
+        %crslti = %{&Apache::lonnet::unserialize($reply)};
+        my $cachetime = 24*60*60;
+        &Apache::lonnet::do_cache_new('courseltienc',$hashid,\%crslti,$cachetime);
+    }
+
+    return if (!keys(%crslti));
+
+    foreach my $id (keys(%crslti)) {
+        if (ref($crslti{$id}) eq 'HASH') {
+            my $key = $crslti{$id}{'key'};
+            if (($key ne '') && ($crslti{$id}{'secret'} ne '')) {
+                push(@{$crslti_by_key{$key}},$id);
+            }
+        }
+    }
+
+    return if (!keys(%crslti_by_key));
+
+    my %courselti = &Apache::lonnet::get_course_lti($cnum,$cdom,'provider');
+
+    if (ref($crslti_by_key{$consumer_key}) eq 'ARRAY') {
+        foreach my $id (@{$crslti_by_key{$consumer_key}}) {
+            my $secret = $crslti{$id}{'secret'};
+            if (ref($courselti{$id}) eq 'HASH') {
+                if ((exists($courselti{$id}{'cipher'})) &&
+                    ($courselti{$id}{'cipher'} =~ /^\d+$/)) {
+                    my $keynum = $courselti{$id}{'cipher'};
+                    my $privkey = &get_dom("getdom:$cdom:private:$keynum:lti:key");
+                    if ($privkey ne '') {
+                        my $cipher = new Crypt::CBC($privkey);
+                        $secret = $cipher->decrypt_hex($secret);
+                    }
+                }
+            }
+            my $request = Net::OAuth->request('request token')->from_hash($params,
+                                              request_url => $url,
+                                              request_method => $method,
+                                              consumer_secret => $secret,);
+            if ($request->verify()) {
+                $itemid = $id;
+                last;
+            }
+        }
+    }
+    return $itemid;
+}
+
+sub domlti_itemid {
+    my ($dom,$context,$url,$method,$params,$loncaparev) = @_;
+    unless (ref($params) eq 'HASH') {
+        return;
+    }
+    if ($dom eq '') {
+        return;
+    }
+    my ($itemid,$consumer_key,$secret);
+
+    if (exists($params->{'oauth_callback'})) {
+        $Net::OAuth::PROTOCOL_VERSION = Net::OAuth::PROTOCOL_VERSION_1_0A;
+    } else {
+        $Net::OAuth::PROTOCOL_VERSION = Net::OAuth::PROTOCOL_VERSION_1_0;
+    }
+
+    my $consumer_key = $params->{'oauth_consumer_key'};
+    return if ($consumer_key eq '');
+
+    my ($name,$cachename);
+    if ($context eq 'linkprot') {
+        $name = $context;
+    } else {
+        $name = 'lti';
+    }
+    $cachename = $name.'enc';
+    my %ltienc;
+    my ($encresult,$enccached)=&Apache::lonnet::is_cached_new($cachename,$dom);
+    if (defined($enccached)) {
+        if (ref($encresult) eq 'HASH') {
+            %ltienc = %{$encresult};
+        }
+    } else {
+        my $reply = &get_dom("getdom:$dom:encconfig:$name");
+        my $ltiencref = &Apache::lonnet::thaw_unescape($reply);
+        if (ref($ltiencref) eq 'HASH') {
+            %ltienc = %{$ltiencref};
+        }
+        my $cachetime = 24*60*60;
+        &Apache::lonnet::do_cache_new($cachename,$dom,\%ltienc,$cachetime);
+    }
+
+    return if (!keys(%ltienc));
+
+    my %lti_by_key;
+    foreach my $id (keys(%ltienc)) {
+        if (ref($ltienc{$id}) eq 'HASH') {
+            my $key = $ltienc{$id}{'key'};
+            if (($key ne '') && ($ltienc{$id}{'secret'} ne '')) {
+                push(@{$lti_by_key{$key}},$id);
+            }
+        }
+    }
+    return if (!keys(%lti_by_key));
+
+    my %lti = &Apache::lonnet::get_domain_lti($dom,$context);
+
+    if (ref($lti_by_key{$consumer_key}) eq 'ARRAY') {
+        foreach my $id (@{$lti_by_key{$consumer_key}}) {
+            my $secret = $ltienc{$id}{'secret'};
+            if (ref($lti{$id}) eq 'HASH') {
+                if ((exists($lti{$id}{'cipher'})) &&
+                    ($lti{$id}{'cipher'} =~ /^\d+$/)) {
+                    my $keynum = $lti{$id}{'cipher'};
+                    my $privkey = &get_dom("getdom:$dom:private:$keynum:lti:key");
+                    if ($privkey ne '') {
+                        my $cipher = new Crypt::CBC($privkey);
+                        $secret = $cipher->decrypt_hex($secret);
+                    }
+                }
+            }
+            my $request = Net::OAuth->request('request token')->from_hash($params,
+                                              request_url => $url,
+                                              request_method => $method,
+                                              consumer_secret => $secret,);
+            if ($request->verify()) {
+                $itemid = $id;
+                last;
+            }
+        }
+    }
+    return $itemid;
+}
+
 1;
 
 __END__
@@ -933,7 +1162,18 @@ courseID -- for the course for which the
 The contents of the inner hash, for that single item in the outer hash
 are returned (and cached in memcache for 10 minutes).
 
+=item get_dom ( $userinput )
 
+get_dom() will retrieve domain configuration information from a GDBM file
+in /home/httpd/lonUsers/$dom on the primary library server in a domain.
+The single argument passed is the string: $cmd:$udom:$namespace:$what
+where $cmd is the command historically passed to lond - i.e., getdom
+or egetdom, $udom is the domain, $namespace is the name of the GDBM file
+(encconfig or configuration), and $what is a string containing names of
+items to retrieve from the db file (each item name is escaped and separated
+from the next item name with an ampersand). The return value is either:
+error: followed by an error message, or a string containing the value (escaped)
+for each item, again separated from the next item with an ampersand.
 
 =back