Merge branch 'activityatompub' into 0.9.x

12 files changed, 1926 insertions, 9 deletions

diff --git a/actions/apiatomservice.php b/actions/apiatomservice.php
index fb9d6aee8..b60b312fc 100644
--- a/actions/apiatomservice.php
+++ b/actions/apiatomservice.php
@@ -80,7 +80,8 @@ class ApiAtomServiceAction extends ApiBareAuthAction
 
         $this->startXML();
         $this->elementStart('service', array('xmlns' => 'http://www.w3.org/2007/app',
-                                             'xmlns:atom' => 'http://www.w3.org/2005/Atom'));
+                                             'xmlns:atom' => 'http://www.w3.org/2005/Atom',
+                                             'xmlns:activity' => 'http://activitystrea.ms/spec/1.0/'));
         $this->elementStart('workspace');
         $this->element('atom:title', null, _('Main'));
         $this->elementStart('collection',
@@ -92,6 +93,37 @@ class ApiAtomServiceAction extends ApiBareAuthAction
                        sprintf(_("%s timeline"),
                                $this->user->nickname));
         $this->element('accept', null, 'application/atom+xml;type=entry');
+        $this->element('activity:verb', null, ActivityVerb::POST);
+        $this->elementEnd('collection');
+        $this->elementStart('collection',
+                            array('href' => common_local_url('AtomPubSubscriptionFeed',
+                                                             array('subscriber' => $this->user->id))));
+        $this->element('atom:title',
+                       null,
+                       sprintf(_("%s subscriptions"),
+                               $this->user->nickname));
+        $this->element('accept', null, 'application/atom+xml;type=entry');
+        $this->element('activity:verb', null, ActivityVerb::FOLLOW);
+        $this->elementEnd('collection');
+        $this->elementStart('collection',
+                            array('href' => common_local_url('AtomPubFavoriteFeed',
+                                                             array('profile' => $this->user->id))));
+        $this->element('atom:title',
+                       null,
+                       sprintf(_("%s favorites"),
+                               $this->user->nickname));
+        $this->element('accept', null, 'application/atom+xml;type=entry');
+        $this->element('activity:verb', null, ActivityVerb::FAVORITE);
+        $this->elementEnd('collection');
+        $this->elementStart('collection',
+                            array('href' => common_local_url('AtomPubMembershipFeed',
+                                                             array('profile' => $this->user->id))));
+        $this->element('atom:title',
+                       null,
+                       sprintf(_("%s memberships"),
+                               $this->user->nickname));
+        $this->element('accept', null, 'application/atom+xml;type=entry');
+        $this->element('activity:verb', null, ActivityVerb::JOIN);
         $this->elementEnd('collection');
         $this->elementEnd('workspace');
         $this->elementEnd('service');
diff --git a/actions/atompubfavoritefeed.php b/actions/atompubfavoritefeed.php
new file mode 100644
index 000000000..478a01b7c
--- /dev/null
+++ b/actions/atompubfavoritefeed.php
@@ -0,0 +1,374 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * Feed of ActivityStreams 'favorite' actions
+ * 
+ * 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 ActivityStreams 'favorite' actions
+ *
+ * @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/
+ */
+
+class AtompubfavoritefeedAction extends ApiAuthAction
+{
+    private $_profile = null;
+    private $_faves   = null;
+
+    /**
+     * For initializing members of the class.
+     *
+     * @param array $argarray misc. arguments
+     *
+     * @return boolean true
+     */
+
+    function prepare($argarray)
+    {
+        parent::prepare($argarray);
+
+        $this->_profile = Profile::staticGet('id', $this->trimmed('profile'));
+
+        if (empty($this->_profile)) {
+            throw new ClientException(_('No such profile'), 404);
+        }
+
+        $offset = ($this->page-1) * $this->count;
+        $limit  = $this->count + 1;
+
+        $this->_faves = Fave::byProfile($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->addFavorite();
+            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('AtomPubFavoriteFeed',
+                                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 favorites"),
+                                $this->_profile->getBestName()));
+
+        $feed->setSubtitle(sprintf(_("Notices %s has favorited to on %s"),
+                                   $this->_profile->getBestName(),
+                                   common_config('site', 'name')));
+
+        $feed->addLink(common_local_url('showfavorites',
+                                        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('AtomPubFavoriteFeed',
+                                            array('profile' => 
+                                                  $this->_profile->id),
+                                            array('page' => 
+                                                  $this->page - 1)),
+                           array('rel' => 'prev',
+                                 'type' => 'application/atom+xml'));
+        }
+
+        if ($this->_faves->N > $this->count) {
+
+            $feed->addLink(common_local_url('AtomPubFavoriteFeed',
+                                            array('profile' =>
+                                                  $this->_profile->id),
+                                            array('page' =>
+                                                  $this->page + 1)),
+                           array('rel' => 'next',
+                                 'type' => 'application/atom+xml'));
+        }
+
+        $i = 0;
+
+        while ($this->_faves->fetch()) {
+
+            // We get one more than needed; skip that one
+
+            $i++;
+
+            if ($i > $this->count) {
+                break;
+            }
+
+            $act = $this->_faves->asActivity();
+            $feed->addEntryRaw($act->asString(false, false, false));
+        }
+
+        $this->raw($feed->getString());
+    }
+
+    /**
+     * add a new favorite
+     *
+     * @return void
+     */
+
+    function addFavorite()
+    {
+        // 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".
+                                        " subscription"), 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);
+
+        $fave = null;
+
+        if (Event::handle('StartAtomPubNewActivity', array(&$activity))) {
+
+            if ($activity->verb != ActivityVerb::FAVORITE) {
+                // TRANS: Client error displayed when not using the POST verb.
+                // TRANS: Do not translate POST.
+                throw new ClientException(_('Can only handle Favorite activities.'));
+                return;
+            }
+
+            $note = $activity->objects[0];
+
+            if (!in_array($note->type, array(ActivityObject::NOTE,
+                                             ActivityObject::BLOGENTRY,
+                                             ActivityObject::STATUS))) {
+                throw new ClientException(_('Can only fave notices.'));
+                return;
+            }
+
+            $notice = Notice::staticGet('uri', $note->id);
+
+            if (empty($notice)) {
+                // XXX: import from listed URL or something
+                throw new ClientException(_('Unknown note.'));
+            }
+
+            $old = Fave::pkeyGet(array('user_id' => $this->auth_user->id,
+                                       'notice_id' => $notice->id));
+
+            if (!empty($old)) {
+                throw new ClientException(_('Already a favorite.'));
+            }
+
+            $profile = $this->auth_user->getProfile();
+
+            $fave = Fave::addNew($profile, $notice);
+
+            if (!empty($fave)) {
+                $this->_profile->blowFavesCache();
+                $this->notify($fave, $notice, $this->auth_user);
+            }
+
+            Event::handle('EndAtomPubNewActivity', array($activity, $fave));
+        }
+
+        if (!empty($fave)) {
+            $act = $fave->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;
+        }
+    }
+
+    /**
+     * Notify the author of the favorite that the user likes their notice
+     *
+     * @param Favorite $fave   the favorite in question
+     * @param Notice   $notice the notice that's been faved
+     * @param User     $user   the user doing the favoriting
+     *
+     * @return void
+     */
+
+    function notify($fave, $notice, $user)
+    {
+        $other = User::staticGet('id', $notice->profile_id);
+        if ($other && $other->id != $user->id) {
+            if ($other->email && $other->emailnotifyfav) {
+                mail_notify_fave($other, $user, $notice);
+            }
+            // XXX: notify by IM
+            // XXX: notify by SMS
+        }
+    }
+}
diff --git a/actions/atompubmembershipfeed.php b/actions/atompubmembershipfeed.php
new file mode 100644
index 000000000..3002576c1
--- /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;
+        }
+    }
+}
diff --git a/actions/atompubshowfavorite.php b/actions/atompubshowfavorite.php
new file mode 100644
index 000000000..5fe680bb7
--- /dev/null
+++ b/actions/atompubshowfavorite.php
@@ -0,0 +1,228 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * Show a single favorite in Atom Activity Streams 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';
+
+/**
+ * Show a single favorite in Atom Activity Streams format.
+ *
+ * Can also be used to delete a favorite.
+ *
+ * @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 AtompubshowfavoriteAction extends ApiAuthAction
+{
+    private $_profile = null;
+    private $_notice  = null;
+    private $_fave    = 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');
+        $noticeId  = $this->trimmed('notice');
+
+        $this->_profile = Profile::staticGet('id', $profileId);
+
+        if (empty($this->_profile)) {
+            throw new ClientException(_('No such profile.'), 404);
+        }
+
+        $this->_notice = Notice::staticGet('id', $noticeId);
+
+        if (empty($this->_notice)) {
+            throw new ClientException(_('No such notice.'), 404);
+        }
+
+        $this->_fave = Fave::pkeyGet(array('user_id' => $profileId,
+                                           'notice_id' => $noticeId));
+
+        if (empty($this->_fave)) {
+            throw new ClientException(_('No such favorite.'), 404);
+        }
+
+        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 GET:
+        case HEAD:
+            $this->showFave();
+            break;
+        case DELETE:
+            $this->deleteFave();
+            break;
+        default:
+            throw new ClientException(_('HTTP method not supported.'),
+                                      405);
+        }
+        return true;
+    }
+
+    /**
+     * Show a single favorite, in ActivityStreams format
+     * 
+     * @return void
+     */
+
+    function showFave()
+    {
+        $activity = $this->_fave->asActivity();
+
+        header('Content-Type: application/atom+xml; charset=utf-8');
+
+        $this->startXML();
+        $this->raw($activity->asString(true, true, true));
+        $this->endXML();
+
+        return;
+    }
+
+    /**
+     * Delete the favorite
+     * 
+     * @return void
+     */
+
+    function deleteFave()
+    {
+        if (empty($this->auth_user) ||
+            $this->auth_user->id != $this->_profile->id) {
+            throw new ClientException(_("Can't delete someone else's".
+                                        " favorite"), 403);
+        }
+
+        $this->_fave->delete();
+
+        return;
+    }
+
+    /**
+     * 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' ||
+            $_SERVER['REQUEST_METHOD'] == 'HEAD') {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Return last modified, if applicable.
+     *
+     * MAY override
+     *
+     * @return string last modified http header
+     */
+
+    function lastModified()
+    {
+        return max(strtotime($this->_profile->modified),
+                   strtotime($this->_notice->modified),
+                   strtotime($this->_fave->modified));
+    }
+
+    /**
+     * Return etag, if applicable.
+     *
+     * MAY override
+     *
+     * @return string etag http header
+     */
+
+    function etag()
+    {
+        $mtime = strtotime($this->_fave->modified);
+
+        return 'W/"' . implode(':', array('AtomPubShowFavorite',
+                                          $this->_profile->id,
+                                          $this->_notice->id,
+                                          $mtime)) . '"';
+    }
+
+    /**
+     * Does this require authentication?
+     *
+     * @return boolean true if delete, else false
+     */
+
+    function requiresAuth()
+    {
+        if ($_SERVER['REQUEST_METHOD'] == 'GET' ||
+            $_SERVER['REQUEST_METHOD'] == 'HEAD') {
+            return false;
+        } else {
+            return true;
+        }
+    }
+}
diff --git a/actions/atompubshowmembership.php b/actions/atompubshowmembership.php
new file mode 100644
index 000000000..6d848a229
--- /dev/null
+++ b/actions/atompubshowmembership.php
@@ -0,0 +1,235 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * Show a single membership as an Activity Streams entry
+ * 
+ * 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';
+
+/**
+ * Show (or delete) a single membership event as an ActivityStreams entry
+ *
+ * @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/
+ */
+
+class AtompubshowmembershipAction extends ApiAuthAction
+{
+    private $_profile    = null;
+    private $_group      = null;
+    private $_membership = 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);
+        }
+
+        $groupId = $this->trimmed('group');
+
+        $this->_group = User_group::staticGet('id', $groupId);
+
+        if (empty($this->_group)) {
+            throw new ClientException(_('No such group'), 404);
+        }
+
+        $kv = array('group_id' => $groupId,
+                    'profile_id' => $profileId);
+
+        $this->_membership = Group_member::pkeyGet($kv);
+
+        if (empty($this->_membership)) {
+            throw new ClientException(_('Not a member'), 404);
+        }
+
+        return true;
+    }
+
+    /**
+     * Handler method
+     *
+     * @param array $argarray is ignored since it's now passed in in prepare()
+     *
+     * @return void
+     */
+
+    function handle($argarray=null)
+    {
+        switch ($_SERVER['REQUEST_METHOD']) {
+        case 'GET':
+        case 'HEAD':
+            $this->showMembership();
+            break;
+        case 'DELETE':
+            $this->deleteMembership();
+            break;
+        default:
+            throw new ClientException(_('Method not supported'), 405);
+            break;
+        }
+        return;
+    }
+
+    /**
+     * show a single membership
+     *
+     * @return void
+     */
+
+    function showMembership()
+    {
+        $activity = $this->_membership->asActivity();
+
+        header('Content-Type: application/atom+xml; charset=utf-8');
+
+        $this->startXML();
+        $this->raw($activity->asString(true, true, true));
+        $this->endXML();
+
+        return;
+    }
+
+    /**
+     * Delete the membership (leave the group)
+     *
+     * @return void
+     */
+
+    function deleteMembership()
+    {
+        if (empty($this->auth_user) ||
+            $this->auth_user->id != $this->_profile->id) {
+            throw new ClientException(_("Can't delete someone else's".
+                                        " membership"), 403);
+        }
+
+        if (Event::handle('StartLeaveGroup', array($this->_group, $this->auth_user))) {
+            Group_member::leave($this->_group->id, $this->auth_user->id);
+            Event::handle('EndLeaveGroup', array($this->_group, $this->auth_user));
+        }
+
+        return;
+    }
+
+    /**
+     * 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' ||
+            $_SERVER['REQUEST_METHOD'] == 'HEAD') {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Return last modified, if applicable.
+     *
+     * Because the representation depends on the profile and group,
+     * our last modified value is the maximum of their mod time
+     * with the actual membership's mod time.
+     *
+     * @return string last modified http header
+     */
+    function lastModified()
+    {
+        return max(strtotime($this->_profile->modified),
+                   strtotime($this->_group->modified),
+                   strtotime($this->_membership->modified));
+    }
+
+    /**
+     * Return etag, if applicable.
+     *
+     * A "weak" Etag including the profile and group id as well as
+     * the admin flag and ctime of the membership.
+     *
+     * @return string etag http header
+     */
+
+    function etag()
+    {
+        $ctime = strtotime($this->_membership->created);
+
+        $adminflag = ($this->_membership->is_admin) ? 't' : 'f';
+
+        return 'W/"' . implode(':', array('AtomPubShowMembership',
+                                          $this->_profile->id,
+                                          $this->_group->id,
+                                          $adminflag,
+                                          $ctime)) . '"';
+    }
+
+    /**
+     * Does this require authentication?
+     *
+     * @return boolean true if delete, else false
+     */
+
+    function requiresAuth()
+    {
+        if ($_SERVER['REQUEST_METHOD'] == 'GET' ||
+            $_SERVER['REQUEST_METHOD'] == 'HEAD') {
+            return false;
+        } else {
+            return true;
+        }
+    }
+}
diff --git a/actions/atompubshowsubscription.php b/actions/atompubshowsubscription.php
new file mode 100644
index 000000000..55ba68adc
--- /dev/null
+++ b/actions/atompubshowsubscription.php
@@ -0,0 +1,224 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * Single subscription
+ * 
+ * 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';
+
+/**
+ * Show a single subscription
+ *
+ * @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/
+ */
+
+class AtompubshowsubscriptionAction extends ApiAuthAction
+{
+    private $_subscriber   = null;
+    private $_subscribed   = null;
+    private $_subscription = null;
+
+    /** 
+     * For initializing members of the class.
+     *
+     * @param array $argarray misc. arguments
+     *
+     * @return boolean true
+     */
+
+    function prepare($argarray)
+    {
+        parent::prepare($argarray);
+        $subscriberId = $this->trimmed('subscriber');
+
+        $this->_subscriber = Profile::staticGet('id', $subscriberId);
+
+        if (empty($this->_subscriber)) {
+            throw new ClientException(sprintf(_('No such profile id: %d'),
+                                              $subscriberId), 404);
+        }
+
+        $subscribedId = $this->trimmed('subscribed');
+
+        $this->_subscribed = Profile::staticGet('id', $subscribedId);
+
+        if (empty($this->_subscribed)) {
+            throw new ClientException(sprintf(_('No such profile id: %d'),
+                                              $subscribedId), 404);
+        }
+
+        $this->_subscription = 
+            Subscription::pkeyGet(array('subscriber' => $subscriberId,
+                                        'subscribed' => $subscribedId));
+
+        if (empty($this->_subscription)) {
+            $msg = sprintf(_('Profile %d not subscribed to profile %d'),
+                           $subscriberId, $subscribedId);
+            throw new ClientException($msg, 404);
+        }
+
+        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->showSubscription();
+            break;
+        case 'DELETE':
+            $this->deleteSubscription();
+            break;
+        default:
+            $this->clientError(_('HTTP method not supported.'), 405);
+            return;
+        }
+
+        return;
+    }
+
+    /**
+     * Show the subscription in ActivityStreams Atom format.
+     *
+     * @return void
+     */
+
+    function showSubscription()
+    {
+        $activity = $this->_subscription->asActivity();
+
+        header('Content-Type: application/atom+xml; charset=utf-8');
+
+        $this->startXML();
+        $this->raw($activity->asString(true, true, true));
+        $this->endXML();
+
+        return;
+    }
+
+    /**
+     * Delete the subscription
+     *
+     * @return void
+     */
+
+    function deleteSubscription()
+    {
+        if (empty($this->auth_user) ||
+            $this->auth_user->id != $this->_subscriber->id) {
+            throw new ClientException(_("Can't delete someone else's".
+                                        " subscription"), 403);
+        }
+
+        Subscription::cancel($this->_subscriber,
+                             $this->_subscribed);
+
+        return;
+    }
+
+    /**
+     * Is this action read only?
+     *
+     * @param array $args other arguments
+     *
+     * @return boolean true
+     */
+    
+    function isReadOnly($args)
+    {
+        if ($_SERVER['REQUEST_METHOD'] == 'DELETE') {
+            return false;
+        } else {
+            return true;
+        }
+    }
+
+    /**
+     * Return last modified, if applicable.
+     *
+     * @return string last modified http header
+     */
+
+    function lastModified()
+    {
+        return max(strtotime($this->_subscriber->modified),
+                   strtotime($this->_subscribed->modified),
+                   strtotime($this->_subscription->modified));
+    }
+
+    /**
+     * Etag for this object
+     *
+     * @return string etag http header
+     */
+
+    function etag()
+    {
+        $mtime = strtotime($this->_subscription->modified);
+
+        return 'W/"' . implode(':', array('AtomPubShowSubscription',
+                                          $this->_subscriber->id,
+                                          $this->_subscribed->id,
+                                          $mtime)) . '"';
+    }
+
+    /**
+     * Does this require authentication?
+     *
+     * @return boolean true if delete, else false
+     */
+
+    function requiresAuth()
+    {
+        if ($_SERVER['REQUEST_METHOD'] == 'DELETE') {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}
diff --git a/actions/atompubsubscriptionfeed.php b/actions/atompubsubscriptionfeed.php
new file mode 100644
index 000000000..15ae79f6a
--- /dev/null
+++ b/actions/atompubsubscriptionfeed.php
@@ -0,0 +1,335 @@
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2010, StatusNet, Inc.
+ *
+ * AtomPub subscription feed
+ * 
+ * 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  Cache
+ * @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';
+
+/**
+ * Subscription feed class for AtomPub
+ *
+ * Generates a list of the user's subscriptions
+ * 
+ * @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/
+ */
+
+class AtompubsubscriptionfeedAction extends ApiAuthAction
+{
+    private $_profile       = null;
+    private $_subscriptions = null;
+
+    /**
+     * For initializing members of the class.
+     *
+     * @param array $argarray misc. arguments
+     *
+     * @return boolean true
+     */
+
+    function prepare($argarray)
+    {
+        parent::prepare($argarray);
+        
+        $subscriber = $this->trimmed('subscriber');
+
+        $this->_profile = Profile::staticGet('id', $subscriber);
+
+        if (empty($this->_profile)) {
+            throw new ClientException(sprintf(_('No such profile id: %d'),
+                                              $subscriber), 404);
+        }
+
+        // page and count from ApiAction
+
+        $offset = ($this->page-1) * $this->count;
+
+        $this->_subscriptions = Subscription::bySubscriber($subscriber,
+                                                           $offset,
+                                                           $this->count + 1);
+
+        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->addSubscription();
+            break;
+        default:
+            $this->clientError(_('HTTP method not supported.'), 405);
+            return;
+        }
+
+        return;
+    }
+
+    /**
+     * Show the feed of subscriptions
+     *
+     * @return void
+     */
+
+    function showFeed()
+    {
+        header('Content-Type: application/atom+xml; charset=utf-8');
+
+        $url = common_local_url('AtomPubSubscriptionFeed',
+                                array('subscriber' => $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 subscriptions"),
+                                $this->_profile->getBestName()));
+
+        $feed->setSubtitle(sprintf(_("People %s has subscribed to on %s"),
+                                   $this->_profile->getBestName(),
+                                   common_config('site', 'name')));
+
+        $feed->addLink(common_local_url('subscriptions',
+                                        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('AtomPubSubscriptionFeed',
+                                            array('subscriber' => 
+                                                  $this->_profile->id),
+                                            array('page' => 
+                                                  $this->page - 1)),
+                           array('rel' => 'prev',
+                                 'type' => 'application/atom+xml'));
+        }
+
+        if ($this->_subscriptions->N > $this->count) {
+
+            $feed->addLink(common_local_url('AtomPubSubscriptionFeed',
+                                            array('subscriber' =>
+                                                  $this->_profile->id),
+                                            array('page' =>
+                                                  $this->page + 1)),
+                           array('rel' => 'next',
+                                 'type' => 'application/atom+xml'));
+        }
+
+        $i = 0;
+
+        // XXX: This is kind of inefficient
+
+        while ($this->_subscriptions->fetch()) {
+
+            // We get one more than needed; skip that one
+
+            $i++;
+
+            if ($i > $this->count) {
+                break;
+            }
+
+            $act = $this->_subscriptions->asActivity();
+            $feed->addEntryRaw($act->asString(false, false, false));
+        }
+
+        $this->raw($feed->getString());
+    }
+
+    /**
+     * Add a new subscription
+     *
+     * Handling the POST method for AtomPub
+     *
+     * @return void
+     */
+
+    function addSubscription()
+    {
+        if (empty($this->auth_user) ||
+            $this->auth_user->id != $this->_profile->id) {
+            throw new ClientException(_("Can't add someone else's".
+                                        " subscription"), 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.
+            $this->clientError(_('Atom post must be an Atom entry.'));
+            return;
+        }
+
+        $activity = new Activity($dom->documentElement);
+
+        $sub = null;
+
+        if (Event::handle('StartAtomPubNewActivity', array(&$activity))) {
+
+            if ($activity->verb != ActivityVerb::FOLLOW) {
+                // TRANS: Client error displayed when not using the POST verb.
+                // TRANS: Do not translate POST.
+                $this->clientError(_('Can only handle Follow activities.'));
+                return;
+            }
+
+            $person = $activity->objects[0];
+
+            if ($person->type != ActivityObject::PERSON) {
+                $this->clientError(_('Can only follow people.'));
+                return;
+            }
+
+            // XXX: OStatus discovery (maybe)
+
+            $profile = Profile::fromURI($person->id);
+
+            if (empty($profile)) {
+                $this->clientError(sprintf(_('Unknown profile %s'), $person->id));
+                return;
+            }
+
+            if (Subscription::start($this->_profile, $profile)) {
+                $sub = Subscription::pkeyGet(array('subscriber' => $this->_profile->id,
+                                                   'subscribed' => $profile->id));
+            }
+
+            Event::handle('EndAtomPubNewActivity', array($activity, $sub));
+        }
+
+        if (!empty($sub)) {
+            $act = $sub->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.
+     *
+     * @param array $args other arguments
+     *
+     * @return boolean is read only action?
+     */
+
+    function isReadOnly($args)
+    {
+        return $_SERVER['REQUEST_METHOD'] != 'POST';
+    }
+
+    /**
+     * Return last modified, if applicable.
+     *
+     * @return string last modified http header
+     */
+
+    function lastModified()
+    {
+        return null;
+    }
+
+    /**
+     * Return etag, if applicable.
+     *
+     * @return string etag http header
+     */
+
+    function etag()
+    {
+        return null;
+    }
+
+    /**
+     * Does this require authentication?
+     *
+     * @return boolean true if delete, else false
+     */
+
+    function requiresAuth()
+    {
+        if ($_SERVER['REQUEST_METHOD'] == 'POST') {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}
diff --git a/actions/subscriptions.php b/actions/subscriptions.php
index ba2f67f2d..a814a4f35 100644
--- a/actions/subscriptions.php
+++ b/actions/subscriptions.php
@@ -163,6 +163,22 @@ class SubscriptionsAction extends GalleryAction
         $cloud2 = new SubscriptionsPeopleSelfTagCloudSection($this);
         $cloud2->show();
     }
+
+    /**
+     * Link to feeds of subscriptions
+     *
+     * @return array of Feed objects
+     */
+
+    function getFeeds()
+    {
+        return array(new Feed(Feed::ATOM,
+                              common_local_url('AtomPubSubscriptionFeed',
+                                               array('subscriber' => $this->profile->id)),
+                              sprintf(_('Subscription feed for %s (Atom)'),
+                                      $this->profile->nickname)));
+
+    }
 }
 
 // XXX SubscriptionsList and SubscriptionList are dangerously close
@@ -247,4 +263,5 @@ class SubscriptionsListItem extends SubscriptionListItem
         $this->out->elementEnd('form');
         return;
     }
+
 }
diff --git a/classes/Fave.php b/classes/Fave.php
index 9922ae45c..3aa23e7b4 100644
--- a/classes/Fave.php
+++ b/classes/Fave.php
@@ -138,6 +138,9 @@ class Fave extends Memcached_DataObject
         $act = new Activity();
 
         $act->verb = ActivityVerb::FAVORITE;
+
+        // FIXME: rationalize this with URL below
+
         $act->id   = TagURI::mint('favor:%d:%d:%s',
                                   $profile->id,
                                   $notice->id,
@@ -155,6 +158,41 @@ class Fave extends Memcached_DataObject
         $act->actor     = ActivityObject::fromProfile($profile);
         $act->objects[] = ActivityObject::fromNotice($notice);
 
+        $url = common_local_url('AtomPubShowFavorite',
+                                          array('profile' => $this->user_id,
+                                                'notice'  => $this->notice_id));
+
+        $act->selfLink = $url;
+        $act->editLink = $url;
+
         return $act;
     }
+
+    /**
+     * Fetch a stream of favorites by profile
+     *
+     * @param integer $profileId Profile that faved
+     * @param integer $offset    Offset from last
+     * @param integer $limit     Number to get
+     *
+     * @return mixed stream of faves, use fetch() to iterate
+     *
+     * @todo Cache results
+     * @todo integrate with Fave::stream()
+     */
+
+    static function byProfile($profileId, $offset, $limit)
+    {
+        $fav = new Fave();
+
+        $fav->user_id = $profileId;
+
+        $fav->orderBy('modified DESC');
+
+        $fav->limit($offset, $limit);
+
+        $fav->find();
+
+        return $fav;
+    }
 }
diff --git a/classes/Group_member.php b/classes/Group_member.php
index c40d06a1d..2cf31cf12 100644
--- a/classes/Group_member.php
+++ b/classes/Group_member.php
@@ -26,6 +26,15 @@ class Group_member extends Memcached_DataObject
         return Memcached_DataObject::pkeyGet('Group_member', $kv);
     }
 
+    /**
+     * Method to add a user to a group.
+     *
+     * @param integer $group_id   Group to add to
+     * @param integer $profile_id Profile being added
+     * 
+     * @return Group_member new membership object
+     */
+
     static function join($group_id, $profile_id)
     {
         $member = new Group_member();
@@ -42,7 +51,7 @@ class Group_member extends Memcached_DataObject
             throw new Exception(_("Group join failed."));
         }
 
-        return true;
+        return $member;
     }
 
     static function leave($group_id, $profile_id)
@@ -92,6 +101,31 @@ class Group_member extends Memcached_DataObject
         return $group;
     }
 
+    /**
+     * Get stream of memberships by member
+     *
+     * @param integer $memberId profile ID of the member to fetch for
+     * @param integer $offset   offset from start of stream to get
+     * @param integer $limit    number of memberships to get
+     *
+     * @return Group_member stream of memberships, use fetch() to iterate
+     */
+
+    static function byMember($memberId, $offset=0, $limit=GROUPS_PER_PAGE)
+    {
+        $membership = new Group_member();
+
+        $membership->profile_id = $memberId;
+
+        $membership->orderBy('created DESC');
+
+        $membership->limit($offset, $limit);
+
+        $membership->find();
+
+        return $membership;
+    }
+
     function asActivity()
     {
         $member = $this->getMember();
@@ -118,6 +152,13 @@ class Group_member extends Memcached_DataObject
                                 $member->getBestName(),
                                 $group->getBestName());
 
+        $url = common_local_url('AtomPubShowMembership',
+                                array('profile' => $member->id,
+                                      'group' => $group->id));
+
+        $act->selfLink = $url;
+        $act->editLink = $url;
+
         return $act;
     }
 }
diff --git a/classes/Subscription.php b/classes/Subscription.php
index 763e3835b..1d4f37929 100644
--- a/classes/Subscription.php
+++ b/classes/Subscription.php
@@ -253,6 +253,8 @@ class Subscription extends Memcached_DataObject
 
         $act->verb = ActivityVerb::FOLLOW;
 
+        // XXX: rationalize this with the URL
+
         $act->id   = TagURI::mint('follow:%d:%d:%s',
                                   $subscriber->id,
                                   $subscribed->id,
@@ -270,6 +272,13 @@ class Subscription extends Memcached_DataObject
         $act->actor     = ActivityObject::fromProfile($subscriber);
         $act->objects[] = ActivityObject::fromProfile($subscribed);
 
+        $url = common_local_url('AtomPubShowSubscription',
+                                array('subscriber' => $subscriber->id,
+                                      'subscribed' => $subscribed->id));
+
+        $act->selfLink = $url;
+        $act->editLink = $url;
+
         return $act;
     }
 
diff --git a/lib/router.php b/lib/router.php
index d747493de..c42cca5f6 100644
--- a/lib/router.php
+++ b/lib/router.php
@@ -761,13 +761,6 @@ class Router
             $m->connect('api/oauth/authorize',
                         array('action' => 'ApiOauthAuthorize'));
 
-            $m->connect('api/statusnet/app/service/:id.xml',
-                        array('action' => 'ApiAtomService',
-                              'id' => Nickname::INPUT_FMT));
-
-            $m->connect('api/statusnet/app/service.xml',
-                        array('action' => 'ApiAtomService'));
-
             // Admin
 
             $m->connect('admin/site', array('action' => 'siteadminpanel'));
@@ -909,6 +902,42 @@ class Router
                             array('nickname' => Nickname::DISPLAY_FMT));
             }
 
+            // AtomPub API
+
+            $m->connect('api/statusnet/app/service/:id.xml',
+                        array('action' => 'ApiAtomService',
+                              'id' => Nickname::DISPLAY_FMT));
+
+            $m->connect('api/statusnet/app/service.xml',
+                        array('action' => 'ApiAtomService'));
+
+            $m->connect('api/statusnet/app/subscriptions/:subscriber/:subscribed.atom',
+                        array('action' => 'AtomPubShowSubscription'),
+                        array('subscriber' => '[0-9]+',
+                              'subscribed' => '[0-9]+'));
+
+            $m->connect('api/statusnet/app/subscriptions/:subscriber.atom',
+                        array('action' => 'AtomPubSubscriptionFeed'),
+                        array('subscriber' => '[0-9]+'));
+
+            $m->connect('api/statusnet/app/favorites/:profile/:notice.atom',
+                        array('action' => 'AtomPubShowFavorite'),
+                        array('profile' => '[0-9]+',
+                              'notice' => '[0-9]+'));
+
+            $m->connect('api/statusnet/app/favorites/:profile.atom',
+                        array('action' => 'AtomPubFavoriteFeed'),
+                        array('profile' => '[0-9]+'));
+
+            $m->connect('api/statusnet/app/memberships/:profile/:group.atom',
+                        array('action' => 'AtomPubShowMembership'),
+                        array('profile' => '[0-9]+',
+                              'group' => '[0-9]+'));
+
+            $m->connect('api/statusnet/app/memberships/:profile.atom',
+                        array('action' => 'AtomPubMembershipFeed'),
+                        array('profile' => '[0-9]+'));
+
             // user stuff
 
             Event::handle('RouterInitialized', array($m));