--- loncom/lti/ltiauth.pm	2018/08/14 21:03:39	1.16
+++ loncom/lti/ltiauth.pm	2018/12/26 20:10:29	1.17
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Basic LTI Authentication Module
 #
-# $Id: ltiauth.pm,v 1.16 2018/08/14 21:03:39 raeburn Exp $
+# $Id: ltiauth.pm,v 1.17 2018/12/26 20:10:29 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -339,6 +339,30 @@ sub handler {
     }
 
 #
+# Determine if a username is required from the domain
+# configuration for the specific LTI Consumer
+#
+
+    if (!$lti{$itemid}{'requser'}) {
+        if ($tail =~ m{^/tiny/($match_domain)/(\w+)$}) {
+            foreach my $key (%{$params}) {
+                delete($env{'form.'.$key});
+            }
+            my $ltoken = &Apache::lonnet::tmpput({'linkprot' => $itemid.':'.$tail},
+                                                   $lonhost);
+            if ($ltoken) {
+                $r->internal_redirect($tail.'?ltoken='.$ltoken);
+                $r->set_handlers('PerlHandler'=> undef);
+            } else {
+                &invalid_request($r,9);    
+            }
+        } else {
+            &invalid_request($r,10);
+        }
+        return OK;
+    }
+
+#
 # Determine if source of username matches requirement from the 
 # domain configuration for the specific LTI Consumer.
 # 
@@ -394,7 +418,7 @@ sub handler {
             if ($consumers{$sourcecrs} =~ /^$match_courseid$/) {
                 my $crshome = &Apache::lonnet::homeserver($consumers{$sourcecrs},$cdom);
                 if ($crshome =~ /(con_lost|no_host|no_such_host)/) {
-                    &invalid_request($r,9);
+                    &invalid_request($r,11);
                     return OK;
                 } else {
                     $posscnum = $consumers{$sourcecrs};
@@ -406,7 +430,7 @@ sub handler {
     if ($urlcnum ne '') {
         if ($posscnum ne '') {
             if ($posscnum ne $urlcnum) {
-                &invalid_request($r,10);
+                &invalid_request($r,12);
                 return OK;
             } else {
                 $cnum = $posscnum;
@@ -414,7 +438,7 @@ sub handler {
         } else {
             my $crshome = &Apache::lonnet::homeserver($urlcnum,$cdom);
             if ($crshome =~ /(con_lost|no_host|no_such_host)/) {
-                &invalid_request($r,11);
+                &invalid_request($r,13);
                 return OK;
             } else {
                 $cnum = $urlcnum;
@@ -479,7 +503,7 @@ sub handler {
                                                     $domdesc,\%data,\%alerts,\%rulematch,
                                                     \%inst_results,\%curr_rules,%got_rules);
                 if ($result eq 'notallowed') {
-                    &invalid_request($r,12);
+                    &invalid_request($r,14);
                 } elsif ($result eq 'ok') {
                     if (($ltiroles[0] eq 'Instructor') && ($lcroles[0] eq 'cc') && ($lti{$itemid}{'mapcrs'}) &&
                         ($lti{$itemid}{'makecrs'})) {
@@ -488,16 +512,16 @@ sub handler {
                         }
                     }
                 } else {
-                    &invalid_request($r,13);
+                    &invalid_request($r,15);
                     return OK;
                 }
             } else {
-                &invalid_request($r,14);
+                &invalid_request($r,16);
                 return OK;
             }
         }
     } else {
-        &invalid_request($r,15);
+        &invalid_request($r,17);
         return OK;
     }
 
@@ -519,10 +543,10 @@ sub handler {
                              $symb,$cdom,$cnum,$params,\@ltiroles,$lti{$itemid},\@lcroles,
                              $reqcrs,$sourcecrs);
             } else {
-                &invalid_request($r,16);
+                &invalid_request($r,18);
             }
         } else {
-            &invalid_request($r,17);
+            &invalid_request($r,19);
         }
         return OK;
     }
@@ -608,7 +632,7 @@ sub handler {
             }
         }
         if ($reqrole eq '') {
-            &invalid_request($r,18);
+            &invalid_request($r,20);
             return OK;
         } else {
             unless (%crsenv) {
@@ -618,10 +642,10 @@ sub handler {
             my $default_enrollment_end_date   = $crsenv{'default_enrollment_end_date'};
             my $now = time;
             if ($default_enrollment_end_date && $default_enrollment_end_date <= $now) {
-                &invalid_request($r,19);
+                &invalid_request($r,21);
                 return OK;
             } elsif ($default_enrollment_start_date && $default_enrollment_start_date >$now) {
-                &invalid_request($r,20);
+                &invalid_request($r,22);
                 return OK;
             } else {
                 $selfenrollrole = $reqrole.'./'.$cdom.'/'.$cnum;