OStatus group delivery initial implementation.

- added rel="ostatus:attention" links for group delivery
- added events for plugins to override group profile/permalink pages
- pulled Notice::saveGroups up to save-time so we can override;
  it's relatively cheap and gives us a clean list of target
  groups for distrib time even with customized delivery.
- fixed notice::getGroups to return group objects as expected
- added some doc on new parameters to Notice::saveNew
 - 'groups' list of group IDs to push to in place of parsing
- messages that come in via PuSH and contain local group targets
  are delivered to local group members
- messages that come in via PuSH and contain remote group targets
  are delivered to local members of the remote group

Todo:
- handle group posts that only come through Salmon
- handle conflicts in case something comes in both through Salmon and PuSH
- better source verification
- need a cleaner interface to look up groups by URI
- need a way to handle remote groups with conflicting names

1 files changed, 14 insertions, 4 deletions

diff --git a/classes/User_group.php b/classes/User_group.php
index 379e6b721..1382aa407 100644
--- a/classes/User_group.php
+++ b/classes/User_group.php
@@ -39,14 +39,24 @@ class User_group extends Memcached_DataObject
 
     function homeUrl()
     {
-        return common_local_url('showgroup',
-                                array('nickname' => $this->nickname));
+        $url = null;
+        if (Event::handle('StartUserGroupHomeUrl', array($this, &$url))) {
+            $url = common_local_url('showgroup',
+                                    array('nickname' => $this->nickname));
+        }
+        Event::handle('EndUserGroupHomeUrl', array($this, &$url));
+        return $url;
     }
 
     function permalink()
     {
-        return common_local_url('groupbyid',
-                                array('id' => $this->id));
+        $url = null;
+        if (Event::handle('StartUserGroupPermalink', array($this, &$url))) {
+            $url = common_local_url('groupbyid',
+                                    array('id' => $this->id));
+        }
+        Event::handle('EndUserGroupPermalink', array($this, &$url));
+        return $url;
     }
 
     function getNotices($offset, $limit, $since_id=null, $max_id=null)