Merge branch '0.9.x' into 1.0.x

Conflicts:
	EVENTS.txt
	db/statusnet.sql
	lib/queuemanager.php

9 files changed, 571 insertions, 154 deletions

diff --git a/classes/Conversation.php b/classes/Conversation.php
new file mode 100755
index 000000000..ea8bd87b5
--- /dev/null
+++ b/classes/Conversation.php
@@ -0,0 +1,78 @@
+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Data class for Conversations
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Data
+ * @package   StatusNet
+ * @author    Zach Copley <zach@status.net>
+ * @copyright 2010 StatusNet Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://status.net/
+ */
+
+require_once INSTALLDIR . '/classes/Memcached_DataObject.php';
+
+class Conversation extends Memcached_DataObject
+{
+    ###START_AUTOCODE
+    /* the code below is auto generated do not remove the above tag */
+
+    public $__table = 'conversation';                    // table name
+    public $id;                              // int(4)  primary_key not_null
+    public $uri;                             // varchar(225)  unique_key
+    public $created;                         // datetime   not_null
+    public $modified;                        // timestamp   not_null default_CURRENT_TIMESTAMP
+
+    /* Static get */
+    function staticGet($k,$v=NULL) { return Memcached_DataObject::staticGet('conversation',$k,$v); }
+
+    /* the code above is auto generated do not remove the tag below */
+    ###END_AUTOCODE
+
+    /**
+     * Factory method for creating a new conversation
+     *
+     * @return Conversation the new conversation DO
+     */
+    static function create()
+    {
+        $conv = new Conversation();
+        $conv->created = common_sql_now();
+        $id = $conv->insert();
+
+        if (empty($id)) {
+            common_log_db_error($conv, 'INSERT', __FILE__);
+            return null;
+        }
+
+        $orig = clone($conv);
+        $orig->uri = common_local_url('conversation', array('id' => $id));
+        $result = $orig->update($conv);
+
+        if (empty($result)) {
+            common_log_db_error($conv, 'UPDATE', __FILE__);
+            return null;
+        }
+
+        return $conv;
+    }
+
+}
+
diff --git a/classes/Fave.php b/classes/Fave.php
index 8113c8e16..0b6eec2bc 100644
--- a/classes/Fave.php
+++ b/classes/Fave.php
@@ -21,17 +21,47 @@ class Fave extends Memcached_DataObject
     /* the code above is auto generated do not remove the tag below */
     ###END_AUTOCODE
 
-    static function addNew($user, $notice) {
-        $fave = new Fave();
-        $fave->user_id = $user->id;
-        $fave->notice_id = $notice->id;
-        if (!$fave->insert()) {
-            common_log_db_error($fave, 'INSERT', __FILE__);
-            return false;
+    static function addNew($profile, $notice) {
+
+        $fave = null;
+
+        if (Event::handle('StartFavorNotice', array($profile, $notice, &$fave))) {
+
+            $fave = new Fave();
+
+            $fave->user_id   = $profile->id;
+            $fave->notice_id = $notice->id;
+
+            if (!$fave->insert()) {
+                common_log_db_error($fave, 'INSERT', __FILE__);
+                return false;
+            }
+
+            Event::handle('EndFavorNotice', array($profile, $notice));
         }
+
         return $fave;
     }
 
+    function delete()
+    {
+        $profile = Profile::staticGet('id', $this->user_id);
+        $notice  = Notice::staticGet('id', $this->notice_id);
+
+        $result = null;
+
+        if (Event::handle('StartDisfavorNotice', array($profile, $notice, &$result))) {
+
+            $result = parent::delete();
+
+            if ($result) {
+                Event::handle('EndDisfavorNotice', array($profile, $notice));
+            }
+        }
+
+        return $result;
+    }
+
     function pkeyGet($kv)
     {
         return Memcached_DataObject::pkeyGet('Fave', $kv);
diff --git a/classes/Memcached_DataObject.php b/classes/Memcached_DataObject.php
index 40576dc71..bc4c3a000 100644
--- a/classes/Memcached_DataObject.php
+++ b/classes/Memcached_DataObject.php
@@ -501,7 +501,11 @@ class Memcached_DataObject extends Safe_DataObject
 
     function raiseError($message, $type = null, $behaviour = null)
     {
-        throw new ServerException("DB_DataObject error [$type]: $message");
+        $id = get_class($this);
+        if ($this->id) {
+            $id .= ':' . $this->id;
+        }
+        throw new ServerException("[$id] DB_DataObject error [$type]: $message");
     }
 
     static function cacheGet($keyPart)
diff --git a/classes/Notice.php b/classes/Notice.php
index 73b22d58a..e8d5c45cb 100644
--- a/classes/Notice.php
+++ b/classes/Notice.php
@@ -187,13 +187,21 @@ class Notice extends Memcached_DataObject
      *              int 'location_ns' geoname namespace to interpret location_id
      *              int 'reply_to'; notice ID this is a reply to
      *              int 'repeat_of'; notice ID this is a repeat of
-     *              string 'uri' permalink to notice; defaults to local notice URL
+     *              string 'uri' unique ID for notice; defaults to local notice URL
+     *              string 'url' permalink to notice; defaults to local notice URL
+     *              string 'rendered' rendered HTML version of content
+     *              array 'replies' list of profile URIs for reply delivery in
+     *                              place of extracting @-replies from content.
+     *              array 'groups' list of group IDs to deliver to, in place of
+     *                              extracting ! tags from content
+     * @fixme tag override
      *
      * @return Notice
      * @throws ClientException
      */
     static function saveNew($profile_id, $content, $source, $options=null) {
         $defaults = array('uri' => null,
+                          'url' => null,
                           'reply_to' => null,
                           'repeat_of' => null);
 
@@ -256,9 +264,16 @@ class Notice extends Memcached_DataObject
         }
 
         $notice->content = $final;
-        $notice->rendered = common_render_content($final, $notice);
+
+        if (!empty($rendered)) {
+            $notice->rendered = $rendered;
+        } else {
+            $notice->rendered = common_render_content($final, $notice);
+        }
+
         $notice->source = $source;
         $notice->uri = $uri;
+        $notice->url = $url;
 
         // Handle repeat case
 
@@ -309,7 +324,8 @@ class Notice extends Memcached_DataObject
             // the beginning of a new conversation.
 
             if (empty($notice->conversation)) {
-                $notice->conversation = $notice->id;
+                $conv = Conversation::create();
+                $notice->conversation = $conv->id;
                 $changed = true;
             }
 
@@ -324,21 +340,35 @@ class Notice extends Memcached_DataObject
 
         # Clear the cache for subscribed users, so they'll update at next request
         # XXX: someone clever could prepend instead of clearing the cache
+
         $notice->blowOnInsert();
 
+        if (isset($replies)) {
+            $notice->saveKnownReplies($replies);
+        } else {
+            $notice->saveReplies();
+        }
+
+        if (isset($groups)) {
+            $notice->saveKnownGroups($groups);
+        } else {
+            $notice->saveGroups();
+        }
+
         $notice->distribute();
 
         return $notice;
     }
 
-    function blowOnInsert()
+    function blowOnInsert($conversation = false)
     {
         self::blow('profile:notice_ids:%d', $this->profile_id);
         self::blow('public');
 
-        if ($this->conversation != $this->id) {
-            self::blow('notice:conversation_ids:%d', $this->conversation);
-        }
+        // XXX: Before we were blowing the casche only if the notice id
+        // was not the root of the conversation.  What to do now?
+
+        self::blow('notice:conversation_ids:%d', $this->conversation);
 
         if (!empty($this->repeat_of)) {
             self::blow('notice:repeats:%d', $this->repeat_of);
@@ -675,11 +705,39 @@ class Notice extends Memcached_DataObject
         return $ni;
     }
 
-    function addToInboxes($groups, $recipients)
+    /**
+     * Adds this notice to the inboxes of each local user who should receive
+     * it, based on author subscriptions, group memberships, and @-replies.
+     *
+     * Warning: running a second time currently will make items appear
+     * multiple times in users' inboxes.
+     *
+     * @fixme make more robust against errors
+     * @fixme break up massive deliveries to smaller background tasks
+     *
+     * @param array $groups optional list of Group objects;
+     *              if left empty, will be loaded from group_inbox records
+     * @param array $recipient optional list of reply profile ids
+     *              if left empty, will be loaded from reply records
+     */
+    function addToInboxes($groups=null, $recipients=null)
     {
         $ni = $this->whoGets($groups, $recipients);
 
-        Inbox::bulkInsert($this->id, array_keys($ni));
+        $ids = array_keys($ni);
+
+        // We remove the author (if they're a local user),
+        // since we'll have already done this in distribute()
+
+        $i = array_search($this->profile_id, $ids);
+
+        if ($i !== false) {
+            unset($ids[$i]);
+        }
+
+        // Bulk insert
+
+        Inbox::bulkInsert($this->id, $ids);
 
         return;
     }
@@ -712,6 +770,42 @@ class Notice extends Memcached_DataObject
     }
 
     /**
+     * Record this notice to the given group inboxes for delivery.
+     * Overrides the regular parsing of !group markup.
+     *
+     * @param string $group_ids
+     * @fixme might prefer URIs as identifiers, as for replies?
+     *        best with generalizations on user_group to support
+     *        remote groups better.
+     */
+    function saveKnownGroups($group_ids)
+    {
+        if (!is_array($group_ids)) {
+            throw new ServerException("Bad type provided to saveKnownGroups");
+        }
+
+        $groups = array();
+        foreach ($group_ids as $id) {
+            $group = User_group::staticGet('id', $id);
+            if ($group) {
+                common_log(LOG_ERR, "Local delivery to group id $id, $group->nickname");
+                $result = $this->addToGroupInbox($group);
+                if (!$result) {
+                    common_log_db_error($gi, 'INSERT', __FILE__);
+                }
+
+                // @fixme should we save the tags here or not?
+                $groups[] = clone($group);
+            } else {
+                common_log(LOG_ERR, "Local delivery to group id $id skipped, doesn't exist");
+            }
+        }
+
+        return $groups;
+    }
+
+    /**
+     * Parse !group delivery and record targets into group_inbox.
      * @return array of Group objects
      */
     function saveGroups()
@@ -795,8 +889,49 @@ class Notice extends Memcached_DataObject
     }
 
     /**
+     * Save reply records indicating that this notice needs to be
+     * delivered to the local users with the given URIs.
+     *
+     * Since this is expected to be used when saving foreign-sourced
+     * messages, we won't deliver to any remote targets as that's the
+     * source service's responsibility.
+     *
+     * @fixme Unlike saveReplies() there's no mail notification here.
+     *        Move that to distrib queue handler?
+     *
+     * @param array of unique identifier URIs for recipients
+     */
+    function saveKnownReplies($uris)
+    {
+        foreach ($uris as $uri) {
+
+            $user = User::staticGet('uri', $uri);
+
+            if (!empty($user)) {
+
+                $reply = new Reply();
+
+                $reply->notice_id  = $this->id;
+                $reply->profile_id = $user->id;
+
+                $id = $reply->insert();
+            }
+        }
+
+        return;
+    }
+
+    /**
+     * Pull @-replies from this message's content in StatusNet markup format
+     * and save reply records indicating that this message needs to be
+     * delivered to those users.
+     *
+     * Side effect: local recipients get e-mail notifications here.
+     * @fixme move mail notifications to distrib?
+     *
      * @return array of integer profile IDs
      */
+
     function saveReplies()
     {
         // Don't save reply data for repeats
@@ -805,76 +940,44 @@ class Notice extends Memcached_DataObject
             return array();
         }
 
-        // Alternative reply format
-        $tname = false;
-        if (preg_match('/^T ([A-Z0-9]{1,64}) /', $this->content, $match)) {
-            $tname = $match[1];
-        }
-        // extract all @messages
-        $cnt = preg_match_all('/(?:^|\s)@([a-z0-9]{1,64})/', $this->content, $match);
-
-        $names = array();
-
-        if ($cnt || $tname) {
-            // XXX: is there another way to make an array copy?
-            $names = ($tname) ? array_unique(array_merge(array(strtolower($tname)), $match[1])) : array_unique($match[1]);
-        }
-
         $sender = Profile::staticGet($this->profile_id);
 
+        $mentions = common_find_mentions($this->profile_id, $this->content);
+
         $replied = array();
 
         // store replied only for first @ (what user/notice what the reply directed,
         // we assume first @ is it)
 
-        for ($i=0; $i<count($names); $i++) {
-            $nickname = $names[$i];
-            $recipient = common_relative_profile($sender, $nickname, $this->created);
-            if (empty($recipient)) {
-                continue;
-            }
-            // Don't save replies from blocked profile to local user
-            $recipient_user = User::staticGet('id', $recipient->id);
-            if (!empty($recipient_user) && $recipient_user->hasBlocked($sender)) {
-                continue;
-            }
-            $reply = new Reply();
-            $reply->notice_id = $this->id;
-            $reply->profile_id = $recipient->id;
-            $id = $reply->insert();
-            if (!$id) {
-                $last_error = &PEAR::getStaticProperty('DB_DataObject','lastError');
-                common_log(LOG_ERR, 'DB error inserting reply: ' . $last_error->message);
-                common_server_error(sprintf(_('DB error inserting reply: %s'), $last_error->message));
-                return array();
-            } else {
-                $replied[$recipient->id] = 1;
-            }
-        }
+        foreach ($mentions as $mention) {
 
-        // Hash format replies, too
-        $cnt = preg_match_all('/(?:^|\s)@#([a-z0-9]{1,64})/', $this->content, $match);
-        if ($cnt) {
-            foreach ($match[1] as $tag) {
-                $tagged = Profile_tag::getTagged($sender->id, $tag);
-                foreach ($tagged as $t) {
-                    if (!$replied[$t->id]) {
-                        // Don't save replies from blocked profile to local user
-                        $t_user = User::staticGet('id', $t->id);
-                        if ($t_user && $t_user->hasBlocked($sender)) {
-                            continue;
-                        }
-                        $reply = new Reply();
-                        $reply->notice_id = $this->id;
-                        $reply->profile_id = $t->id;
-                        $id = $reply->insert();
-                        if (!$id) {
-                            common_log_db_error($reply, 'INSERT', __FILE__);
-                            return array();
-                        } else {
-                            $replied[$recipient->id] = 1;
-                        }
-                    }
+            foreach ($mention['mentioned'] as $mentioned) {
+
+                // skip if they're already covered
+
+                if (!empty($replied[$mentioned->id])) {
+                    continue;
+                }
+
+                // Don't save replies from blocked profile to local user
+
+                $mentioned_user = User::staticGet('id', $mentioned->id);
+                if (!empty($mentioned_user) && $mentioned_user->hasBlocked($sender)) {
+                    continue;
+                }
+
+                $reply = new Reply();
+
+                $reply->notice_id  = $this->id;
+                $reply->profile_id = $mentioned->id;
+
+                $id = $reply->insert();
+
+                if (!$id) {
+                    common_log_db_error($reply, 'INSERT', __FILE__);
+                    throw new ServerException("Couldn't save reply for {$this->id}, {$mentioned->id}");
+                } else {
+                    $replied[$mentioned->id] = 1;
                 }
             }
         }
@@ -915,9 +1018,10 @@ class Notice extends Memcached_DataObject
     }
 
     /**
-     * Same calculation as saveGroups but without the saving
-     * @fixme merge the functions
-     * @return array of Group_inbox objects
+     * Pull list of groups this notice needs to be delivered to,
+     * as previously recorded by saveGroups() or saveKnownGroups().
+     *
+     * @return array of Group objects
      */
     function getGroups()
     {
@@ -940,7 +1044,10 @@ class Notice extends Memcached_DataObject
 
         if ($gi->find()) {
             while ($gi->fetch()) {
-                $groups[] = clone($gi);
+                $group = User_group::staticGet('id', $gi->group_id);
+                if ($group) {
+                    $groups[] = $group;
+                }
             }
         }
 
@@ -960,6 +1067,7 @@ class Notice extends Memcached_DataObject
                            'xmlns:thr' => 'http://purl.org/syndication/thread/1.0',
                            'xmlns:georss' => 'http://www.georss.org/georss',
                            'xmlns:activity' => 'http://activitystrea.ms/spec/1.0/',
+                           'xmlns:poco' => 'http://portablecontacts.net/spec/1.0',
                            'xmlns:ostatus' => 'http://ostatus.org/schema/1.0');
         } else {
             $attrs = array();
@@ -997,6 +1105,7 @@ class Notice extends Memcached_DataObject
         $xs->raw($profile->asActivityActor());
 
         $xs->element('link', array('rel' => 'alternate',
+                                   'type' => 'text/html',
                                    'href' => $this->bestUrl()));
 
         $xs->element('id', null, $this->uri);
@@ -1015,33 +1124,45 @@ class Notice extends Memcached_DataObject
             }
         }
 
-        if (!empty($this->conversation)
-            && $this->conversation != $this->id) {
-            $xs->element(
-                'link', array(
-                    'rel' => 'ostatus:conversation',
-                    'href' => common_local_url(
-                        'conversation',
-                        array('id' => $this->conversation)
-                        )
+        if (!empty($this->conversation)) {
+
+            $conv = Conversation::staticGet('id', $this->conversation);
+
+            if (!empty($conv)) {
+                $xs->element(
+                    'link', array(
+                        'rel' => 'ostatus:conversation',
+                        'href' => $conv->uri
                     )
                 );
+            }
         }
 
         $reply_ids = $this->getReplies();
 
         foreach ($reply_ids as $id) {
             $profile = Profile::staticGet('id', $id);
-            if (!empty($profile)) {
+           if (!empty($profile)) {
                 $xs->element(
                     'link', array(
                         'rel' => 'ostatus:attention',
-                        'href' => $profile->getAcctUri()
+                        'href' => $profile->getUri()
                     )
                 );
             }
         }
 
+        $groups = $this->getGroups();
+
+        foreach ($groups as $group) {
+            $xs->element(
+                'link', array(
+                    'rel' => 'ostatus:attention',
+                    'href' => $group->permalink()
+                )
+            );
+        }
+
         if (!empty($this->repeat_of)) {
             $repeat = Notice::staticGet('id', $this->repeat_of);
             if (!empty($repeat)) {
@@ -1087,6 +1208,21 @@ class Notice extends Memcached_DataObject
         return $xs->getString();
     }
 
+    /**
+     * Returns an XML string fragment with a reference to a notice as an
+     * Activity Streams noun object with the given element type.
+     *
+     * Assumes that 'activity' namespace has been previously defined.
+     *
+     * @param string $element one of 'subject', 'object', 'target'
+     * @return string
+     */
+    function asActivityNoun($element)
+    {
+        $noun = ActivityObject::fromNotice($this);
+        return $noun->asString('activity:' . $element);
+    }
+
     function bestUrl()
     {
         if (!empty($this->url)) {
@@ -1484,6 +1620,14 @@ class Notice extends Memcached_DataObject
 
     function distribute()
     {
+        // We always insert for the author so they don't
+        // have to wait
+
+        $user = User::staticGet('id', $this->profile_id);
+        if (!empty($user)) {
+            Inbox::insertNotice($user->id, $this->id);
+        }
+
         if (common_config('queue', 'inboxes')) {
             // If there's a failure, we want to _force_
             // distribution at this point.
diff --git a/classes/Profile.php b/classes/Profile.php
index ab05bb854..78223b34a 100644
--- a/classes/Profile.php
+++ b/classes/Profile.php
@@ -769,7 +769,7 @@ class Profile extends Memcached_DataObject
 
         $xs->elementStart('author');
         $xs->element('name', null, $this->nickname);
-        $xs->element('uri', null, $this->profileurl);
+        $xs->element('uri', null, $this->getUri());
         $xs->elementEnd('author');
 
         return $xs->getString();
@@ -792,51 +792,59 @@ class Profile extends Memcached_DataObject
      * Returns an XML string fragment with profile information as an
      * Activity Streams noun object with the given element type.
      *
-     * Assumes that 'activity' namespace has been previously defined.
+     * Assumes that 'activity', 'georss', and 'poco' namespace has been
+     * previously defined.
      *
      * @param string $element one of 'actor', 'subject', 'object', 'target'
+     *
      * @return string
      */
     function asActivityNoun($element)
     {
-        $xs = new XMLStringer(true);
+        $noun = ActivityObject::fromProfile($this);
+        return $noun->asString('activity:' . $element);
+    }
 
-        $xs->elementStart('activity:' . $element);
-        $xs->element(
-            'activity:object-type',
-            null,
-            'http://activitystrea.ms/schema/1.0/person'
-        );
-        $xs->element(
-            'id',
-            null,
-            common_local_url(
-                'userbyid',
-                array('id' => $this->id)
-                )
-            );
-        $xs->element('title', null, $this->getBestName());
-
-        $avatar = $this->getAvatar(AVATAR_PROFILE_SIZE);
-
-        $xs->element(
-            'link', array(
-                'type' => empty($avatar) ? 'image/png' : $avatar->mediatype,
-                'href' => empty($avatar)
-                ? Avatar::defaultImage(AVATAR_PROFILE_SIZE)
-                : $avatar->displayUrl()
-            ),
-            ''
-        );
-
-        $xs->elementEnd('activity:' . $element);
+    /**
+     * Returns the best URI for a profile. Plugins may override.
+     *
+     * @return string $uri
+     */
+    function getUri()
+    {
+        $uri = null;
 
-        return $xs->getString();
+        // give plugins a chance to set the URI
+        if (Event::handle('StartGetProfileUri', array($this, &$uri))) {
+
+            // check for a local user first
+            $user = User::staticGet('id', $this->id);
+
+            if (!empty($user)) {
+                $uri = $user->uri;
+            } else {
+                // return OMB profile if any
+                $remote = Remote_profile::staticGet('id', $this->id);
+                if (!empty($remote)) {
+                    $uri = $remote->uri;
+                }
+            }
+            Event::handle('EndGetProfileUri', array($this, &$uri));
+        }
+
+        return $uri;
     }
 
-    function getAcctUri()
+    function hasBlocked($other)
     {
-        return $this->nickname . '@' . common_config('site', 'server');
-    }
+        $block = Profile_block::get($this->id, $other->id);
 
+        if (empty($block)) {
+            $result = false;
+        } else {
+            $result = true;
+        }
+
+        return $result;
+    }
 }
diff --git a/classes/Subscription.php b/classes/Subscription.php
index faf1331cd..d6fb3fcbd 100644
--- a/classes/Subscription.php
+++ b/classes/Subscription.php
@@ -24,7 +24,7 @@ if (!defined('STATUSNET') && !defined('LACONICA')) { exit(1); }
  */
 require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
 
-class Subscription extends Memcached_DataObject 
+class Subscription extends Memcached_DataObject
 {
     ###START_AUTOCODE
     /* the code below is auto generated do not remove the above tag */
@@ -34,8 +34,8 @@ class Subscription extends Memcached_DataObject
     public $subscribed;                      // int(4)  primary_key not_null
     public $jabber;                          // tinyint(1)   default_1
     public $sms;                             // tinyint(1)   default_1
-    public $token;                           // varchar(255)  
-    public $secret;                          // varchar(255)  
+    public $token;                           // varchar(255)
+    public $secret;                          // varchar(255)
     public $created;                         // datetime()   not_null
     public $modified;                        // timestamp()   not_null default_CURRENT_TIMESTAMP
 
@@ -45,9 +45,155 @@ class Subscription extends Memcached_DataObject
 
     /* the code above is auto generated do not remove the tag below */
     ###END_AUTOCODE
-    
+
     function pkeyGet($kv)
     {
         return Memcached_DataObject::pkeyGet('Subscription', $kv);
     }
+
+    /**
+     * Make a new subscription
+     *
+     * @param Profile $subscriber party to receive new notices
+     * @param Profile $other      party sending notices; publisher
+     *
+     * @return Subscription new subscription
+     */
+
+    static function start($subscriber, $other)
+    {
+        if (!$subscriber->hasRight(Right::SUBSCRIBE)) {
+            throw new Exception(_('You have been banned from subscribing.'));
+        }
+
+        if (self::exists($subscriber, $other)) {
+            throw new Exception(_('Already subscribed!'));
+        }
+
+        if ($other->hasBlocked($subscriber)) {
+            throw new Exception(_('User has blocked you.'));
+        }
+
+        if (Event::handle('StartSubscribe', array($subscriber, $other))) {
+
+            $sub = new Subscription();
+
+            $sub->subscriber = $subscriber->id;
+            $sub->subscribed = $other->id;
+            $sub->created    = common_sql_now();
+
+            $result = $sub->insert();
+
+            if (!$result) {
+                common_log_db_error($sub, 'INSERT', __FILE__);
+                throw new Exception(_('Could not save subscription.'));
+            }
+
+            $sub->notify();
+
+            self::blow('user:notices_with_friends:%d', $subscriber->id);
+
+            $subscriber->blowSubscriptionsCount();
+            $other->blowSubscribersCount();
+
+            $otherUser = User::staticGet('id', $other->id);
+
+            if (!empty($otherUser) &&
+                $otherUser->autosubscribe &&
+                !self::exists($other, $subscriber) &&
+                !$subscriber->hasBlocked($other)) {
+
+                $auto = new Subscription();
+
+                $auto->subscriber = $subscriber->id;
+                $auto->subscribed = $other->id;
+                $auto->created    = common_sql_now();
+
+                $result = $auto->insert();
+
+                if (!$result) {
+                    common_log_db_error($auto, 'INSERT', __FILE__);
+                    throw new Exception(_('Could not save subscription.'));
+                }
+
+                $auto->notify();
+            }
+
+            Event::handle('EndSubscribe', array($subscriber, $other));
+        }
+
+        return true;
+    }
+
+    function notify()
+    {
+        # XXX: add other notifications (Jabber, SMS) here
+        # XXX: queue this and handle it offline
+        # XXX: Whatever happens, do it in Twitter-like API, too
+
+        $this->notifyEmail();
+    }
+
+    function notifyEmail()
+    {
+        $subscribedUser = User::staticGet('id', $this->subscribed);
+
+        if (!empty($subscribedUser)) {
+
+            $subscriber = Profile::staticGet('id', $this->subscriber);
+
+            mail_subscribe_notify_profile($subscribedUser, $subscriber);
+        }
+    }
+
+    /**
+     * Cancel a subscription
+     *
+     */
+
+    function cancel($subscriber, $other)
+    {
+        if (!self::exists($subscriber, $other)) {
+            throw new Exception(_('Not subscribed!'));
+        }
+
+        // Don't allow deleting self subs
+
+        if ($subscriber->id == $other->id) {
+            throw new Exception(_('Couldn\'t delete self-subscription.'));
+        }
+
+        if (Event::handle('StartUnsubscribe', array($subscriber, $other))) {
+
+            $sub = Subscription::pkeyGet(array('subscriber' => $subscriber->id,
+                                               'subscribed' => $other->id));
+
+            // note we checked for existence above
+
+            assert(!empty($sub));
+
+            $result = $sub->delete();
+
+            if (!$result) {
+                common_log_db_error($sub, 'DELETE', __FILE__);
+                throw new Exception(_('Couldn\'t delete subscription.'));
+            }
+
+            self::blow('user:notices_with_friends:%d', $subscriber->id);
+
+            $subscriber->blowSubscriptionsCount();
+            $other->blowSubscribersCount();
+
+            Event::handle('EndUnsubscribe', array($subscriber, $other));
+        }
+
+        return;
+    }
+
+    function exists($subscriber, $other)
+    {
+        $sub = Subscription::pkeyGet(array('subscriber' => $subscriber->id,
+                                           'subscribed' => $other->id));
+        return (empty($sub)) ? false : true;
+    }
 }
diff --git a/classes/User.php b/classes/User.php
index 1c967b527..0f84ed813 100644
--- a/classes/User.php
+++ b/classes/User.php
@@ -75,11 +75,7 @@ class User extends Memcached_DataObject
 
     function isSubscribed($other)
     {
-        assert(!is_null($other));
-        // XXX: cache results of this query
-        $sub = Subscription::pkeyGet(array('subscriber' => $this->id,
-                                           'subscribed' => $other->id));
-        return (is_null($sub)) ? false : true;
+        return Subscription::exists($this->getProfile(), $other);
     }
 
     // 'update' won't write key columns, so we have to do it ourselves.
@@ -162,17 +158,8 @@ class User extends Memcached_DataObject
 
     function hasBlocked($other)
     {
-
-        $block = Profile_block::get($this->id, $other->id);
-
-        if (is_null($block)) {
-            $result = false;
-        } else {
-            $result = true;
-            $block->free();
-        }
-
-        return $result;
+        $profile = $this->getProfile();
+        return $profile->hasBlocked($other);
     }
 
     /**
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)
diff --git a/classes/statusnet.ini b/classes/statusnet.ini
index bcff744bd..d116b16a3 100644
--- a/classes/statusnet.ini
+++ b/classes/statusnet.ini
@@ -47,6 +47,16 @@ modified = 384
 [consumer__keys]
 consumer_key = K
 
+[conversation]
+id = 129
+uri = 2
+created = 142
+modified = 384
+
+[conversation__keys]
+id = N
+uri = U
+
 [deleted_notice]
 id = 129
 profile_id = 129