--- /dev/null
+<?php
+/**
+ * StatusNet - the distributed open-source microblogging tool
+ * Copyright (C) 2008-2011, StatusNet, Inc.
+ *
+ * Tag subscription action.
+ *
+ * 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/>.
+ *
+ * PHP version 5
+ *
+ * @category Action
+ * @package StatusNet
+ * @author Brion Vibber <brion@status.net>
+ * @author Evan Prodromou <evan@status.net>
+ * @copyright 2008-2010 StatusNet, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
+ * @link http://status.net/
+ */
+
+if (!defined('STATUSNET')) {
+ exit(1);
+}
+
+/**
+ * Tag subscription action
+ *
+ * Takes parameters:
+ *
+ * - token: session token to prevent CSRF attacks
+ * - ajax: boolean; whether to return Ajax or full-browser results
+ *
+ * Only works if the current user is logged in.
+ *
+ * @category Action
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @author Brion Vibber <brion@status.net>
+ * @copyright 2008-2011 StatusNet, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPLv3
+ * @link http://status.net/
+ */
+class TagsubAction extends Action
+{
+ var $user;
+ var $tag;
+
+ /**
+ * Check pre-requisites and instantiate attributes
+ *
+ * @param Array $args array of arguments (URL, GET, POST)
+ *
+ * @return boolean success flag
+ */
+ function prepare($args)
+ {
+ parent::prepare($args);
+ if ($this->boolean('ajax')) {
+ StatusNet::setApi(true);
+ }
+
+ // Only allow POST requests
+
+ if ($_SERVER['REQUEST_METHOD'] != 'POST') {
+ // TRANS: Client error displayed trying to perform any request method other than POST.
+ // TRANS: Do not translate POST.
+ $this->clientError(_m('This action only accepts POST requests.'));
+ return false;
+ }
+
+ // CSRF protection
+
+ $token = $this->trimmed('token');
+
+ if (!$token || $token != common_session_token()) {
+ // TRANS: Client error displayed when the session token is not okay.
+ $this->clientError(_m('There was a problem with your session token.'.
+ ' Try again, please.'));
+ return false;
+ }
+
+ // Only for logged-in users
+
+ $this->user = common_current_user();
+
+ if (empty($this->user)) {
+ // TRANS: Error message displayed when trying to perform an action that requires a logged in user.
+ $this->clientError(_m('Not logged in.'));
+ return false;
+ }
+
+ // Profile to subscribe to
+
+ $this->tag = $this->arg('tag');
+
+ if (empty($this->tag)) {
+ // TRANS: Client error displayed trying to subscribe to a non-existing profile.
+ $this->clientError(_m('No such profile.'));
+ return false;
+ }
+
+ return true;
+ }
+
+ /**
+ * Handle request
+ *
+ * Does the subscription and returns results.
+ *
+ * @param Array $args unused.
+ *
+ * @return void
+ */
+ function handle($args)
+ {
+ // Throws exception on error
+
+ TagSub::start($this->user->getProfile(),
+ $this->tag);
+
+ if ($this->boolean('ajax')) {
+ $this->startHTML('text/xml;charset=utf-8');
+ $this->elementStart('head');
+ // TRANS: Page title when tag subscription succeeded.
+ $this->element('title', null, _m('Subscribed'));
+ $this->elementEnd('head');
+ $this->elementStart('body');
+ $unsubscribe = new TagUnsubForm($this, $this->tag);
+ $unsubscribe->show();
+ $this->elementEnd('body');
+ $this->elementEnd('html');
+ } else {
+ $url = common_local_url('tag',
+ array('tag' => $this->tag));
+ common_redirect($url, 303);
+ }
+ }
+}