Update Opencast-Block to use correct LTI-Tool

Author: tgloeggl

blocks/OpenCastBlock/OpenCastBlock.php

@@ -3,6 +3,7 @@
 
 use Mooc\UI\Block;
 use Opencast\LTI\OpencastLTI;
+use Opencast\LTI\LtiLink;
 use Opencast\LTI\LTIResourceLink;
 use Opencast\Models\OCConfig;
 
@@ -46,20 +47,36 @@ public function student_view()
 
         $config = OCConfig::getConfigForCourse($course_id);
 
-        $lti_launch_data = OpencastLTI::generate_lti_launch_data(
-            $GLOBALS['user']->id,
-            $course_id,
-            LTIResourceLink::generate_link('series','view complete series for course')
-            //OpencastLTI::generate_tool('series', $this->connectedSeries[0]['series_id'])
-        );
+        $current_user_id = $GLOBALS['auth']->auth['uid'];
 
-        $lti_data = OpencastLTI::sign_lti_data(
-            $lti_launch_data,
+        $lti_link = new LtiLink(
+            OpencastLTI::getSearchUrl($course_id),
             $config['lti_consumerkey'],
-            $config['lti_consumersecret'],
-            OpencastLTI::getSearchUrl($course_id)
+            $config['lti_consumersecret']
+        );
+
+        if ($GLOBALS['perm']->have_studip_perm('tutor', $course_id, $current_user_id)) {
+            $role = 'Instructor';
+        } else if ($GLOBALS['perm']->have_studip_perm('autor', $course_id, $current_user_id)) {
+            $role = 'Learner';
+        }
+
+        $lti_link->setUser($current_user_id, $role);
+        $lti_link->setCourse($course_id);
+        $lti_link->setResource(
+            $connectedSeries,
+            'series',
+            'view complete series for course'
         );
 
+        $launch_data = $lti_link->getBasicLaunchData();
+        $signature   = $lti_link->getLaunchSignature($launch_data);
+
+        $launch_data['oauth_signature'] = $signature;
+
+        $lti_data = json_encode($launch_data);
+        $lti_url  = $lti_link->getLaunchURL();
+
         return array_merge($this->getAttrArray(),
             array(
                 'oc_present'   => $oc_present,
@@ -68,7 +85,7 @@ public function student_view()
                 'useplayer'    => $useplayer,
                 'url_isset'    =>  ($url_opencast != ''),
                 'lti_data'     => json_encode($lti_data),
-                'search_url'   => OpencastLTI::getSearchUrl($course_id)
+                'search_url'   => $lti_url
             )
         );
     }