Atom pub feed for group memberships

Feed for group memberships, in activity streams format.

Shows a feed; has proper pagination; accepts activitystreams "join"
activities to start a new membership.

diff --git a/actions/atompubmembershipfeed.php b/actions/atompubmembershipfeed.php
new file mode 100644 (file)
index 0000000..3002576
--- /dev/null
+++ b/actions/atompubmembershipfeed.php
@@ -0,0 +1,355 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * Feed of group memberships for a user, in ActivityStreams format
+ * 
+ * PHP version 5
+ *
+ * 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  AtomPub
+ * @package   StatusNet
+ * @author    Evan Prodromou <evan@status.net>
+ * @copyright 2010 StatusNet, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
+ * @link      http://status.net/
+ */
+
+if (!defined('STATUSNET')) {
+    // This check helps protect against security problems;
+    // your code file can't be executed directly from the web.
+    exit(1);
+}
+
+require_once INSTALLDIR . '/lib/apiauth.php';
+
+/**
+ * Feed of group memberships for a user, in ActivityStreams format
+ *
+ * @category  Action
+ * @package   StatusNet
+ * @author    Evan Prodromou <evan@status.net>
+ * @copyright 2010 StatusNet, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
+ * @link      http://status.net/
+ */
+
+class AtompubmembershipfeedAction extends ApiAuthAction
+{
+    private $_profile     = null;
+    private $_memberships = null;
+
+    /**
+     * For initializing members of the class.
+     *
+     * @param array $argarray misc. arguments
+     *
+     * @return boolean true
+     */
+
+    function prepare($argarray)
+    {
+        parent::prepare($argarray);
+
+        $profileId = $this->trimmed('profile');
+
+        $this->_profile = Profile::staticGet('id', $profileId);
+        
+        if (empty($this->_profile)) {
+            throw new ClientException(_('No such profile.'), 404);
+        }
+
+        $offset = ($this->page-1) * $this->count;
+        $limit  = $this->count + 1;
+
+        $this->_memberships = Group_member::byMember($this->_profile->id,
+                                                     $offset,
+                                                     $limit);
+        
+        return true;
+    }
+
+    /**
+     * Handler method
+     *
+     * @param array $argarray is ignored since it's now passed in in prepare()
+     *
+     * @return void
+     */
+
+    function handle($argarray=null)
+    {
+        parent::handle($argarray);
+
+        switch ($_SERVER['REQUEST_METHOD']) {
+        case 'HEAD':
+        case 'GET':
+            $this->showFeed();
+            break;
+        case 'POST':
+            $this->addMembership();
+            break;
+        default:
+            throw new ClientException(_('HTTP method not supported.'), 405);
+            return;
+        }
+
+        return;
+    }
+
+    /**
+     * Show a feed of favorite activity streams objects
+     *
+     * @return void
+     */
+
+    function showFeed()
+    {
+        header('Content-Type: application/atom+xml; charset=utf-8');
+
+        $url = common_local_url('AtomPubMembershipFeed',
+                                array('profile' => $this->_profile->id));
+
+        $feed = new Atom10Feed(true);
+
+        $feed->addNamespace('activity',
+                            'http://activitystrea.ms/spec/1.0/');
+
+        $feed->addNamespace('poco',
+                            'http://portablecontacts.net/spec/1.0');
+
+        $feed->addNamespace('media',
+                            'http://purl.org/syndication/atommedia');
+
+        $feed->id = $url;
+
+        $feed->setUpdated('now');
+
+        $feed->addAuthor($this->_profile->getBestName(),
+                         $this->_profile->getURI());
+
+        $feed->setTitle(sprintf(_("%s group memberships"),
+                                $this->_profile->getBestName()));
+
+        $feed->setSubtitle(sprintf(_("Groups %s is a member of on %s"),
+                                   $this->_profile->getBestName(),
+                                   common_config('site', 'name')));
+
+        $feed->addLink(common_local_url('usergroups',
+                                        array('nickname' => 
+                                              $this->_profile->nickname)));
+
+        $feed->addLink($url,
+                       array('rel' => 'self',
+                             'type' => 'application/atom+xml'));
+                                        
+        // If there's more...
+
+        if ($this->page > 1) {
+            $feed->addLink($url,
+                           array('rel' => 'first',
+                                 'type' => 'application/atom+xml'));
+
+            $feed->addLink(common_local_url('AtomPubMembershipFeed',
+                                            array('profile' => 
+                                                  $this->_profile->id),
+                                            array('page' => 
+                                                  $this->page - 1)),
+                           array('rel' => 'prev',
+                                 'type' => 'application/atom+xml'));
+        }
+
+        if ($this->_memberships->N > $this->count) {
+
+            $feed->addLink(common_local_url('AtomPubMembershipFeed',
+                                            array('profile' =>
+                                                  $this->_profile->id),
+                                            array('page' =>
+                                                  $this->page + 1)),
+                           array('rel' => 'next',
+                                 'type' => 'application/atom+xml'));
+        }
+
+        $i = 0;
+
+        while ($this->_memberships->fetch()) {
+
+            // We get one more than needed; skip that one
+
+            $i++;
+
+            if ($i > $this->count) {
+                break;
+            }
+
+            $act = $this->_memberships->asActivity();
+            $feed->addEntryRaw($act->asString(false, false, false));
+        }
+
+        $this->raw($feed->getString());
+    }
+
+    /**
+     * add a new favorite
+     *
+     * @return void
+     */
+
+    function addMembership()
+    {
+        // XXX: Refactor this; all the same for atompub
+
+        if (empty($this->auth_user) ||
+            $this->auth_user->id != $this->_profile->id) {
+            throw new ClientException(_("Can't add someone else's".
+                                        " membership"), 403);
+        }
+        
+        $xml = file_get_contents('php://input');
+
+        $dom = DOMDocument::loadXML($xml);
+
+        if ($dom->documentElement->namespaceURI != Activity::ATOM ||
+            $dom->documentElement->localName != 'entry') {
+            // TRANS: Client error displayed when not using an Atom entry.
+            throw new ClientException(_('Atom post must be an Atom entry.'));
+            return;
+        }
+
+        $activity = new Activity($dom->documentElement);
+
+        $membership = null;
+
+        if (Event::handle('StartAtomPubNewActivity', array(&$activity))) {
+
+            if ($activity->verb != ActivityVerb::JOIN) {
+                // TRANS: Client error displayed when not using the POST verb.
+                // TRANS: Do not translate POST.
+                throw new ClientException(_('Can only handle Join activities.'));
+                return;
+            }
+
+            $groupObj = $activity->objects[0];
+
+            if ($groupObj->type != ActivityObject::GROUP) {
+                throw new ClientException(_('Can only fave notices.'));
+                return;
+            }
+
+            $group = User_group::staticGet('uri', $groupObj->id);
+            
+            if (empty($group)) {
+                // XXX: import from listed URL or something
+                throw new ClientException(_('Unknown group.'));
+            }
+
+            $old = Group_member::pkeyGet(array('profile_id' => $this->auth_user->id,
+                                               'group_id' => $group->id));
+
+            if (!empty($old)) {
+                throw new ClientException(_('Already a member.'));
+            }
+
+            $profile = $this->auth_user->getProfile();
+
+            if (Group_block::isBlocked($group, $profile)) {
+                // XXX: import from listed URL or something
+                throw new ClientException(_('Blocked by admin.'));
+            }
+
+            if (Event::handle('StartJoinGroup', array($group, $this->auth_user))) {
+                $membership = Group_member::join($group->id, $this->auth_user->id);
+                Event::handle('EndJoinGroup', array($group, $this->auth_user));
+            }
+
+            Event::handle('EndAtomPubNewActivity', array($activity, $membership));
+        }
+
+        if (!empty($membership)) {
+            $act = $membership->asActivity();
+
+            header('Content-Type: application/atom+xml; charset=utf-8');
+            header('Content-Location: ' . $act->selfLink);
+
+            $this->startXML();
+            $this->raw($act->asString(true, true, true));
+            $this->endXML();
+        }
+    }
+
+    /**
+     * Return true if read only.
+     *
+     * MAY override
+     *
+     * @param array $args other arguments
+     *
+     * @return boolean is read only action?
+     */
+
+    function isReadOnly($args)
+    {
+        if ($_SERVER['REQUEST_METHOD'] == 'GET' ||
+            $_SERVER['REQUEST_METHOD'] == 'HEAD') {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Return last modified, if applicable.
+     *
+     * MAY override
+     *
+     * @return string last modified http header
+     */
+    function lastModified()
+    {
+        // For comparison with If-Last-Modified
+        // If not applicable, return null
+        return null;
+    }
+
+    /**
+     * Return etag, if applicable.
+     *
+     * MAY override
+     *
+     * @return string etag http header
+     */
+
+    function etag()
+    {
+        return null;
+    }
+
+    /**
+     * Does this require authentication?
+     *
+     * @return boolean true if delete, else false
+     */
+
+    function requiresAuth()
+    {
+        if ($_SERVER['REQUEST_METHOD'] == 'GET' ||
+            $_SERVER['REQUEST_METHOD'] == 'HEAD') {
+            return false;
+        } else {
+            return true;
+        }
+    }
+}