1 files changed, 191 insertions, 2 deletions

diff --git a/app/controllers/activityfeed.php b/app/controllers/activityfeed.php
index 2f93aa1..ee83826 100644
--- a/app/controllers/activityfeed.php
+++ b/app/controllers/activityfeed.php
@@ -53,7 +53,7 @@ class ActivityfeedController extends AuthenticatedController
         unset($modules[Context::INSTITUTE]['participants']);
         unset($modules[Context::INSTITUTE]['schedule']);
 
-        $standard_plugins = PluginManager::getInstance()->getPlugins("StandardPlugin");
+        $standard_plugins = PluginManager::getInstance()->getPlugins(StandardPlugin::class);
         foreach ($standard_plugins as $plugin) {
             if ($plugin instanceof ActivityProvider) {
                 $modules[Context::COURSE][$plugin->getPluginName()] = $plugin->getPluginName();
@@ -67,7 +67,7 @@ class ActivityfeedController extends AuthenticatedController
             'blubber'      => _('Blubber'),
         ];
 
-        $homepage_plugins = PluginEngine::getPlugins('HomepagePlugin');
+        $homepage_plugins = PluginEngine::getPlugins(HomepagePlugin::class);
         foreach ($homepage_plugins as $plugin) {
             if ($plugin->isActivated($GLOBALS['user']->id, 'user')) {
                 if ($plugin instanceof ActivityProvider) {
@@ -92,4 +92,193 @@ class ActivityfeedController extends AuthenticatedController
 
         PageLayout::setTitle(_('Aktivitäten konfigurieren'));
     }
+
+    public function load_action(): void
+    {
+        $user = User::findCurrent();
+
+        // failsafe einbauen - falls es keine älteren Aktivitäten mehr im System gibt, Abbruch!
+
+        $oldest_activity = \Studip\Activity\Activity::getOldestActivity();
+        $max_age = $oldest_activity ? $oldest_activity->mkdate : time();
+
+
+        $contexts = [];
+
+        // create system context
+        $system_context = new \Studip\Activity\SystemContext($user);
+        $contexts[] = $system_context;
+
+        $contexts[] = new \Studip\Activity\UserContext($user, $user);
+        $user->contacts->each(function ($another_user) use (&$contexts, $user) {
+            $contexts[] = new \Studip\Activity\UserContext($another_user, $user);
+        });
+
+        if (!in_array($user->perms, ['admin','root'])) {
+            // create courses and institutes context
+            foreach (\Course::findMany($user->course_memberships->pluck('seminar_id')) as $course) {
+                $contexts[] = new \Studip\Activity\CourseContext($course, $user);
+            }
+            foreach (\Institute::findMany($user->institute_memberships->pluck('institut_id')) as $institute) {
+                $contexts[] = new \Studip\Activity\InstituteContext($institute, $user);
+            }
+        }
+
+
+        // add filters
+        $filter = new \Studip\Activity\Filter();
+
+        $start = Request::int('start', strtotime('yesterday'));
+        $end   = Request::int('end',   time());
+
+
+        $scrollfrom = Request::int('scrollfrom', false);
+        $filtertype = Request::get('filtertype', '');
+
+        $objectType = Request::get('object_type');
+        $filter->setObjectType($objectType);
+
+        $objectId = Request::get('object_id');
+        $filter->setObjectId($objectId);
+
+        $context = Request::get('context_type');
+        $filter->setContext($context);
+
+        $contextId = Request::get('context_id');
+        $filter->setContextId($contextId);
+
+        if (!empty($filtertype)) {
+            $filter->setType(json_decode($filtertype));
+        }
+
+        if ($scrollfrom) {
+            // shorten "watch-window" by one second to prevent duplication of activities
+            $scrollfrom -= 1;
+
+            if ($scrollfrom > $max_age){
+                $end = $scrollfrom;
+                $start = strtotime('yesterday', $end);
+                $data = [];
+
+                $backtrack = 1;
+
+                while (empty($data)) {
+                    $filter->setStartDate($start);
+                    $filter->setEndDate($end);
+
+                    $data = $this->getStreamData($contexts, $filter);
+
+                    if ($start < $max_age) {
+                        break;
+                    }
+
+                    // move "watch-window" back one day at a time
+                    $end = $start - 1;
+                    $start = strtotime("-{$backtrack} days", $start);
+
+                    // enforce maximum "watch-window", currently 2 weeks
+                    $backtrack = min(14, $backtrack + 1);
+                }
+            } else {
+                $data = false;
+            }
+        } else {
+            $filter->setStartDate($start);
+            $filter->setEndDate($end);
+            $data = $this->getStreamData($contexts, $filter);
+        }
+
+        // set etag for preventing resending the same stuff over and over again
+        $etag = md5(serialize($data));
+        $this->response->add_header('ETag', '"' . $etag . '"');
+        if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && $this->etagMatches($etag, $_SERVER['HTTP_IF_NONE_MATCH'])) {
+            $this->set_status(304);
+            $this->render_nothing();
+            return;
+        }
+        if (isset($_SERVER['HTTP_IF_MATCH']) && !$this->etagMatches($etag, $_SERVER['HTTP_IF_MATCH'])) {
+            $this->set_status(412);
+            $this->render_nothing();
+            return;
+        }
+
+        $this->render_json($data);
+    }
+
+    /**
+     *  private helper function to get stream data for given contexts and filter
+     *
+     * @param $contexts
+     * @param $filter
+     * @return array
+     */
+
+    private function getStreamData($contexts, $filter): array
+    {
+        $stream = new Studip\Activity\Stream($contexts, $filter);
+        $data = $stream->toArray();
+
+        foreach ($data as $key => $act) {
+            $actor = [
+                'type' => $act['actor_type'],
+                'id'   => $act['actor_id'],
+            ];
+
+            if ($act['actor_type'] == 'user') {
+                $a_user = \User::findFull($act['actor_id']);
+                $actor['details'] = $this->getMiniUser($a_user ?: new \User());
+            } elseif ($act['actor_type'] === 'anonymous') {
+                $actor['details'] = [
+                    'name' => _('Anonym'),
+                ];
+            }
+
+            unset($data[$key]['actor_type']);
+            unset($data[$key]['actor_id']);
+
+            $data[$key]['actor'] = $actor;
+        }
+
+        return $data;
+    }
+
+    private function getMiniUser(User $user): array
+    {
+        $avatar = \Avatar::getAvatar($user->id);
+
+        return [
+            'id'              => $user->id,
+            'name'            => $this->getNamesOfUser($user),
+            'avatar_small'    => $avatar->getURL(\Avatar::SMALL),
+            'avatar_medium'   => $avatar->getURL(\Avatar::MEDIUM),
+            'avatar_normal'   => $avatar->getURL(\Avatar::NORMAL),
+            'avatar_original' => $avatar->getURL(\Avatar::NORMAL)
+        ];
+    }
+
+    private function getNamesOfUser(User $user): array
+    {
+        return [
+            'username'  => $user->username,
+            'formatted' => $user->getFullName(),
+            'family'    => $user->nachname,
+            'given'     => $user->vorname,
+            'prefix'    => $user->title_front,
+            'suffix'    => $user->title_rear,
+        ];
+    }
+
+    // Helper method checking if a ETag value list includes the current ETag.
+    private function etagMatches(string $etag, string $list)
+    {
+        if ($list === '*') {
+            return true;
+        }
+
+        return in_array(
+            $etag,
+            preg_split('/\s*,\s*/', $list)
+        );
+    }
+
 }