getAcctUri function added with related exception

Used in ActivityObject for Atom Title generation.

New events:
    * StartGetProfileAcctUri
    * EndGetProfileAcctUri

EVENTS.txt

@@ -793,6 +793,14 @@ EndGetProfileUri: After determining the canonical URI for a given profile
 - $profile: the current profile
 - &$uri: the URI
 
+StartGetProfileAcctUri: Get the acct: URI for a Profile (or throw ProfileNoAcctUriException)
+- $profile: Profile of user we want to get acct: URI for
+- &$acct:   string with the resulting acct: uri
+
+EndGetProfileAcctUri: Last attempts to get the acct: URI for a Profile (or throw ProfileNoAcctUriException)
+- $profile: Profile of user we want to get acct: URI for
+- &$acct:   string with the resulting acct: uri
+
 StartFavorNotice: Saving a notice as a favorite
 - $profile: profile of the person faving (can be remote!)
 - $notice: notice being faved

classes/Profile.php

@@ -1349,6 +1349,26 @@ class Profile extends Managed_DataObject
         return $uri;
     }
 
+    /**
+     * Returns an assumed acct: URI for a profile. Plugins are required.
+     *
+     * @return string $uri
+     */
+    public function getAcctUri()
+    {
+        $acct = null;
+
+        if (Event::handle('StartGetProfileAcctUri', array($this, &$acct))) {
+            Event::handle('EndGetProfileAcctUri', array($this, &$acct));
+        }
+
+        if ($acct === null) {
+            throw new ProfileNoAcctUriException($this);
+        }
+
+        return $acct;
+    }
+
     function hasBlocked($other)
     {
         $block = Profile_block::exists($this, $other);

lib/activityobject.php

@@ -438,8 +438,12 @@ class ActivityObject
             $object->type    = (empty($notice->object_type)) ? ActivityObject::NOTE : $notice->object_type;
 
             $object->id      = $notice->uri;
-            $object->title   = 'New ' . ActivityObject::canonicalType($notice->object_type)
-                                . ' by ' . $notice->getProfile()->nickname;
+            $object->title = 'New ' . ActivityObject::canonicalType($object->type) . ' by ';
+            try {
+                $object->title .= $notice->getProfile()->getAcctUri();
+            } catch (ProfileNoAcctUriException $e) {
+                $object->title .= $e->profile->nickname;
+            }
             $object->content = $notice->rendered;
             $object->link    = $notice->bestUrl();
 

lib/profilenoaccturiexception.php

@@ -0,0 +1,58 @@
+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Class for an exception when a Profile has no discernable acct: URI
+ *
+ * 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  Exception
+ * @package   StatusNet
+ * @author    Mikael Nordfeldth <mmn@hethane.se>
+ * @copyright 2013 Free Software Foundation, Inc. 
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
+ * @link      http://www.gnu.org/software/social/
+ */
+
+if (!defined('GNUSOCIAL')) { exit(1); }
+
+/**
+ * Parent class for an exception when a profile is missing
+ *
+ * @category Exception
+ * @package  StatusNet
+ * @author   Evan Prodromou <evan@status.net>
+ * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
+ * @link     http://status.net/
+ */
+
+class ProfileNoAcctUriException extends ServerException
+{
+    public $profile = null;
+
+    public function __construct(Profile $profile, $msg=null)
+    {
+        $this->profile = $profile;
+
+        if ($msg === null) {
+            // TRANS: Exception text shown when no profile can be found for a user.
+            // TRANS: %1$s is a user nickname, $2$d is a user ID (number).
+            $msg = sprintf(_('Could not get an acct: URI for profile with id==%u'), $this->profile->id);
+        }
+
+        parent::__construct($msg);
+    }
+}