--- loncom/interface/lonexttool.pm	2025/06/06 20:36:58	1.28
+++ loncom/interface/lonexttool.pm	2025/06/14 02:50:25	1.29
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Launch External Tool Provider (LTI)
 #
-# $Id: lonexttool.pm,v 1.28 2025/06/06 20:36:58 raeburn Exp $
+# $Id: lonexttool.pm,v 1.29 2025/06/14 02:50:25 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -96,7 +96,7 @@ sub handler {
     my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
     my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
     my $chome = $env{'course.'.$env{'request.course.id'}.'.home'};
-    my ($idx,$crstool,$is_tool,%toolhash,%toolsettings);
+    my ($idx,$crstool,$is_tool,%toolhash,%toolsettings,$desturl,$delay);
 
     if ($r->uri eq "/adm/$cdom/$cnum/$marker/$exttool") {
         %toolsettings=&Apache::lonnet::dump('exttool_'.$marker,$cdom,$cnum);
@@ -136,6 +136,25 @@ sub handler {
                 } else {
                     $toolhash{'returnurl'} = 'none';
                 }
+                if ($toolhash{'desturl'}) {
+                    if ((ref($toolhash{'crsconf'}) eq 'HASH')) {
+                        if ($toolhash{'crsconf'}{'desturl'}) {
+                            if ((exists($toolsettings{'desturl'})) &&
+                                ($toolsettings{'desturl'} =~ m{^(https?\://|/)})) {
+                                $desturl = $toolsettings{'desturl'};
+                                if ((exists($toolsettings{'delay'})) &&
+                                    ($toolsettings{'delay'} =~ /^\d+\.?\d*$/)) {
+                                    $delay = $toolsettings{'delay'};
+                                }
+                            }
+                        } elsif ($toolhash{'defdest'} =~ m{^(https?\://|/)}) {
+                            $desturl = $toolhash{'defdest'};
+                            if ($toolhash{'defdelay'} =~ /^\d+\.?\d*$/) {
+                                $delay = $toolhash{'defdelay'};
+                            }
+                        }
+                    }
+                }
                 $is_tool = 1;
             }
         }
@@ -233,11 +252,31 @@ sub handler {
             if ($toolhash{'crsappend'} ne '') {
                 $url .= $toolhash{'crsappend'};
             }
+            if ($desturl ne '') {
+                my ($scheme,$provider,$path);
+                if ($url =~ m{^https?\://}) {
+                    ($scheme,$provider,$path) = ($url =~ m{^(https?\://)([^/]+)(|/.+)$});
+                    if ($desturl =~ m{^/}) {
+                        if ($path eq $desturl) {
+                            undef($desturl);
+                        } else {
+                            $desturl = $scheme.$provider.$desturl;
+                        }
+                    } elsif ($desturl =~ m{^https?\://}) {
+                        if ($url eq $desturl) {
+                            undef($desturl);
+                        }
+                    }
+                } elsif ($url eq $desturl) {
+                    undef($desturl);
+                }
+            }
             my %info = (
                          method => $toolhash{'sigmethod'},
                        );
             $r->print(&launch_html($cdom,$cnum,$crstool,$url,$idx,
-                                   $toolhash{'cipher'},$submittext,\%lti,\%info));
+                                   $toolhash{'cipher'},$submittext,
+                                   \%lti,\%info,$desturl,$delay));
         } else {
             $r->print('<div class="LC_warning">'.&mt('External Tool Unavailable').'</div>');
         }
@@ -519,33 +558,93 @@ sub lti_params {
 }
 
 sub launch_html {
-    my ($cdom,$cnum,$crstool,$url,$idx,$keynum,$submittext,$paramsref,$inforef) = @_;
+    my ($cdom,$cnum,$crstool,$url,$idx,$keynum,$submittext,$paramsref,
+        $inforef,$desturl,$delay) = @_;
     my ($status,$hashref) =
         &Apache::lonnet::sign_lti($cdom,$cnum,$crstool,'tools','launch',$url,$idx,$keynum,
                                   $paramsref,$inforef);
     unless ($status eq 'ok') {
         return '<div class="LC_warning">'.&mt('External Tool Unavailable').'</div>';
     }
-    my $action = &HTML::Entities::encode($url,'<>&"');
-    my $form = <<"END";
+    my ($action,$js_html,$header,$title,$bodytag,$form,$divsty,$delay_in_ms);
+    if ($delay ne '') {
+        $delay_in_ms = int(1000 * $delay);
+    }
+    $action = &HTML::Entities::encode($url,'<>&"');
+    $title = &mt('Launcher');
+    $header = <<"END";
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
+END
+    if ($desturl) {
+        $divsty = 'none';
+        if ($delay_in_ms eq '') {
+            $delay_in_ms = 1000;
+        }
+        $bodytag = <<"END";
+<body onload="setTimeout(document.LCltiLaunchForm.submit(),$delay_in_ms);">
+END
+    } else {
+        $divsty = 'block';
+        $bodytag = <<"END";
 <body>
-<div id="LCltiLaunch">
+END
+    }
+    $form = <<"END";
+<div id="LCltiLaunch" style="display:$divsty;">
 <form name="LCltiLaunchForm" id="LCltiLaunchFormId" action="$action" method="post" encType="application/x-www-form-urlencoded">
 END
     if (ref($hashref) eq 'HASH') {
         foreach my $item (keys(%{$hashref})) {
             my $type = 'hidden';
             if ($item eq 'basiclti_submit') {
-                $type = 'submit';
+                unless ($desturl) {
+                    $type = 'submit';
+                }
             }
             $form .= '<input type="'.$type.'" name="'.$item.'" value="'.$hashref->{$item}.'" id="id_'.$item.'" />'."\n";
         }
     }
     $form .= "</form></div>\n";
-    $form .= <<"ENDJS";
+    my $footer = <<"END";
+</body>
+</html>
+END
+    if ($desturl) {
+        $js_html = $header.$bodytag.$form.$footer;
+        &js_escape(\$js_html);
+	&js_escape(\$desturl);
+        return <<"END";
+$header
+<head>
+<title>$title</title>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<meta name="google" content="notranslate" />
+</head>
+<body onload="javascript:addcontent();">
+<iframe id="LC_launcher_iframe" style="position: absolute; width:0; height:0; border:0;">
+</iframe>
 <script type="text/javascript">
+// <![CDATA[
+function addcontent() {
+    if (document.getElementById('LC_launcher_iframe')) {
+        document.getElementById('LC_launcher_iframe').src = "data:text/html;charset=utf-8," + escape("$js_html");
+    }
+    setTimeout(() => {
+        document.location.href="$desturl";
+    }, $delay_in_ms);
+}
+// ]]>
+</script>
+$footer
+END
+    } else {
+        return <<"END";
+$header
+$bodytag
+$form
+<script type="text/javascript">
+// <![CDATA[
     document.getElementById("LCltiLaunch").style.display = "none";
     nei = document.createElement('input');
     nei.setAttribute('type','hidden');
@@ -553,10 +652,11 @@ END
     nei.setAttribute('value','$submittext');
     document.getElementById("LCltiLaunchFormId").appendChild(nei);
     document.LCltiLaunchForm.submit();
- </script>
-ENDJS
-    $form .= "</body></html>\n";
-    return $form;
+// ]]>
+</script>
+$footer
+END
+    }
 }
 
 sub gradabletool_access_check {