--- loncom/Lond.pm	2022/01/19 16:47:51	1.8.2.3
+++ loncom/Lond.pm	2022/02/07 12:07:55	1.8.2.3.2.1
@@ -1,6 +1,6 @@
 # The LearningOnline Network
 #
-# $Id: Lond.pm,v 1.8.2.3 2022/01/19 16:47:51 raeburn Exp $
+# $Id: Lond.pm,v 1.8.2.3.2.1 2022/02/07 12:07:55 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -37,7 +37,7 @@ use lib '/home/httpd/lib/perl/';
 use LONCAPA;
 use Apache::lonnet;
 use GDBM_File;
-
+use Net::OAuth;
 
 sub dump_with_regexp {
     my ( $tail, $clientversion ) = @_;
@@ -830,6 +830,160 @@ sub get_dom {
     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));
+
+    if (ref($crslti_by_key{$consumer_key}) eq 'ARRAY') {
+        foreach my $id (@{$crslti_by_key{$consumer_key}}) {
+            my $secret = $crslti{$id}{'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 %ltienc;
+    my ($encresult,$enccached)=&Apache::lonnet::is_cached_new('ltienc',$dom);
+    if (defined($enccached)) {
+        if (ref($encresult) eq 'HASH') {
+            %ltienc = %{$encresult};
+        }
+    } else {
+        my $reply = &get_dom("getdom:$dom:encconfig:lti");
+        my $ltiencref = &Apache::lonnet::thaw_unescape($reply);
+        if (ref($ltiencref) eq 'HASH') {
+            %ltienc = %{$ltiencref};
+        }
+        my $cachetime = 24*60*60;
+        &Apache::lonnet::do_cache_new('ltienc',$dom,\%ltienc,$cachetime);
+    }
+
+    return if (!keys(%ltienc));
+
+    my %lti;
+    if ($context eq 'deeplink') {
+        my ($result,$cached)=&Apache::lonnet::is_cached_new('lti',$dom);
+        if (defined($cached)) {
+            if (ref($result) eq 'HASH') {
+                %lti = %{$result};
+            }
+            }
+        } else {
+            my $reply = &get_dom("getdom:$dom:configuration:lti");
+            my $ltiref = &Apache::lonnet::thaw_unescape($reply);
+            if (ref($ltiref) eq 'HASH') {
+                %lti = %{$ltiref};
+            }
+            my $cachetime = 24*60*60;
+            &Apache::lonnet::do_cache_new('lti',$dom,\%lti,$cachetime);
+        }
+    }
+    return if (!keys(%lti));
+
+    my %lti_by_key;
+    foreach my $id (keys(%ltienc)) {
+        if (ref($ltienc{$id}) eq 'HASH') {
+            my $key = $ltienc{$id}{'key'};
+            if (($key ne '') && ($ltienc{$id}{'secret'} ne '')) {
+                if ($context eq 'deeplink') {
+                    if (ref($lti{$id}) eq 'HASH') {
+                        if (!$lti{$id}{'requser'}) {
+                            push(@{$lti_by_key{$key}},$id);
+                        }
+                    }
+                } else {
+                    push(@{$lti_by_key{$key}},$id);
+                }
+            }
+        }
+    }
+    return if (!keys(%lti_by_key));
+
+    if (ref($lti_by_key{$consumer_key}) eq 'ARRAY') {
+        foreach my $id (@{$lti_by_key{$consumer_key}}) {
+            my $secret = $ltienc{$id}{'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__