OStatus: fix remote groups to work with new user_groups/local_groups split.

- fix <activity:subject> generation so we get the profile info (what's available so far)
- use id instead of nickname for group join/leave forms so we can join/leave remote groups
  while the rest of the groups UI remains limited to local groups
  (plugins are responsible for making sure remote notifications and permission checks are done)
- fix remote notification when joining group through OStatus's remote subscribe form

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/activity.php b/lib/activity.php
index e592aad6f..4e7ff5336 100644
--- a/lib/activity.php
+++ b/lib/activity.php
@@ -610,7 +610,10 @@ class ActivityObject
         $object->id     = $profile->getUri();
         $object->title  = $profile->getBestName();
         $object->link   = $profile->profileurl;
-        $object->avatar = $profile->getAvatar(AVATAR_PROFILE_SIZE);
+        $avatar = $profile->getAvatar(AVATAR_PROFILE_SIZE);
+        if ($avatar) {
+            $object->avatar = $avatar->displayUrl();
+        }
 
         if (isset($profile->lat) && isset($profile->lon)) {
             $object->geopoint = (float)$profile->lat . ' ' . (float)$profile->lon;
@@ -664,7 +667,7 @@ class ActivityObject
                     'rel'  => 'avatar',
                     'href' => empty($this->avatar)
                     ? Avatar::defaultImage(AVATAR_PROFILE_SIZE)
-                    : $this->avatar->displayUrl()
+                    : $this->avatar
                 ),
                 null
             );