[ActivityPub] Ensuring notice deletion

ActivityPubPlugin:
- Minor onDeleteOwnNotice rewrite

Activitypub_inbox_handler:
- Add deletion check to incoming notice

Activitypub_postman:
- Call the correct getUrl function

plugins/ActivityPub/ActivityPubPlugin.php

@@ -743,30 +743,31 @@ class ActivityPubPlugin extends Plugin
             return true;
         }
 
-        $other = [];
+        // The deleting user must have permission to do so, but
+        // it still doesn't own the notitce, so we just need to
+        // handle things locally
+        if (!$notice->isLocal()) {
+            return true;
+        }
+
+        $other = Activitypub_profile::from_profile_collection(
+            $notice->getAttentionProfiles()
+        );
 
-        foreach ($notice->getAttentionProfiles() as $to_profile) {
-            try {
-                $other[] = Activitypub_profile::from_profile($to_profile);
-            } catch (Exception $e) {
-                // Local user can be ignored
-            }
-        }
         if ($notice->reply_to) {
             try {
-                $other[] = Activitypub_profile::from_profile($notice->getParent()->getProfile());
+                $parent_notice = $notice->getParent();
+                
+                try {
+                    $other[] = Activitypub_profile::from_profile($parent_notice->getProfile());
                 } catch (Exception $e) {
                     // Local user can be ignored
                 }
-            try {
-                $mentions = $notice->getParent()->getAttentionProfiles();
-                foreach ($mentions as $to_profile) {
-                    try {
-                        $other[] = Activitypub_profile::from_profile($to_profile);
-                    } catch (Exception $e) {
-                        // Local user can be ignored
-                    }
-                }
+
+                $other = array_merge($other,
+                                     Activitypub_profile::from_profile_collection(
+                                         $parent_notice->getAttentionProfiles()
+                                     ));
             } catch (NoParentNoticeException $e) {
                 // This is not a reply to something (has no parent)
             } catch (NoResultException $e) {

plugins/ActivityPub/lib/inbox_handler.php

@@ -213,9 +213,20 @@ class Activitypub_inbox_handler
      */
     private function handle_delete($actor, $object)
     {
-        $notice = ActivityPubPlugin::grab_notice_from_url($object['object']);
+        // some moderator could already have deleted the
+        // notice, so we test it first
+        try {
+            $found = Deleted_notice::getByUri($object);
+            $deleted = ($found instanceof Deleted_notice);
+        } catch (NoResultException $e) {
+            $deleted = false;
+        }
+
+        if (!$deleted) {
+            $notice = ActivityPubPlugin::grab_notice_from_url($object);
             $notice->deleteAs($actor);
         }
+    }
 
     /**
      * Handles a Follow Activity received by our inbox.

plugins/ActivityPub/lib/postman.php

@@ -350,7 +350,7 @@ class Activitypub_postman
     {
         $data = Activitypub_delete::delete_to_array(
             ActivityPubPlugin::actor_uri($notice->getProfile()),
-            $notice->getUrl()
+            Activitypub_notice::getUrl($notice)
                 );
         $errors = [];
         $data = json_encode($data, JSON_UNESCAPED_SLASHES);