<?php
/**
 * StatusNet, the distributed open-source microblogging tool
 *
 * Plugin to support RSSCloud
 *
 * 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  Plugin
 * @package   StatusNet
 * @author    Zach Copley <zach@status.net>
 * @copyright 2009 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/
 */

if (!defined('STATUSNET')) {
    exit(1);
}

define('RSSCLOUDPLUGIN_VERSION', '0.1');

/**
 * Plugin class for adding RSSCloud capabilities to StatusNet
 *
 * @category Plugin
 * @package  StatusNet
 * @author   Zach Copley <zach@status.net>
 * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link     http://status.net/
 **/

class RSSCloudPlugin extends Plugin
{
    /**
     * Our friend, the constructor
     *
     * @return void
     */
    function __construct()
    {
        parent::__construct();
    }

    /**
     * Setup the info for the subscription handler. Allow overriding
     * to point at another cloud hub (not currently used).
     *
     * @return void
     */

    function onInitializePlugin()
    {
        $this->domain   = common_config('rsscloud', 'domain');
        $this->port     = common_config('rsscloud', 'port');
        $this->path     = common_config('rsscloud', 'path');
        $this->funct    = common_config('rsscloud', 'function');
        $this->protocol = common_config('rsscloud', 'protocol');

        // set defaults

        $local_server = parse_url(common_path('main/rsscloud/request_notify'));

        if (empty($this->domain)) {
            $this->domain = $local_server['host'];
        }

        if (empty($this->port)) {
            $this->port = '80';
        }

        if (empty($this->path)) {
            $this->path = $local_server['path'];
        }

        if (empty($this->funct)) {
            $this->funct = '';
        }

        if (empty($this->protocol)) {
            $this->protocol = 'http-post';
        }
    }

    /**
     * Add RSSCloud-related paths to the router table
     *
     * Hook for RouterInitialized event.
     *
     * @param Mapper $m URL parser and mapper
     *
     * @return boolean hook return
     */

    function onRouterInitialized($m)
    {
        $m->connect('/main/rsscloud/request_notify',
                    array('action' => 'RSSCloudRequestNotify'));

        // XXX: This is just for end-to-end testing. Uncomment if you need to pretend
        //      to be a cloud hub for some reason.
        //$m->connect('/main/rsscloud/notify',
        //            array('action' => 'LoggingAggregator'));

        return true;
    }

    /**
     * Automatically load the actions and libraries used by
     * the RSSCloud plugin
     *
     * @param Class $cls the class
     *
     * @return boolean hook return
     *
     */

    function onAutoload($cls)
    {
        switch ($cls)
        {
        case 'RSSCloudSubscription':
            include_once INSTALLDIR . '/plugins/RSSCloud/RSSCloudSubscription.php';
            return false;
        case 'RSSCloudNotifier':
            include_once INSTALLDIR . '/plugins/RSSCloud/RSSCloudNotifier.php';
            return false;
        case 'RSSCloudQueueHandler':
            include_once INSTALLDIR . '/plugins/RSSCloud/RSSCloudQueueHandler.php';
            return false;
        case 'RSSCloudRequestNotifyAction':
        case 'LoggingAggregatorAction':
            include_once INSTALLDIR . '/plugins/RSSCloud/' .
              mb_substr($cls, 0, -6) . '.php';
            return false;
        default:
            return true;
        }
    }

    /**
     * Add a <cloud> element to the RSS feed (after the rss <channel>
     * element is started).
     *
     * @param Action $action the ApiAction
     *
     * @return void
     */

    function onStartApiRss($action)
    {
        if (get_class($action) == 'ApiTimelineUserAction') {

            $attrs = array('domain'            => $this->domain,
                           'port'              => $this->port,
                           'path'              => $this->path,
                           'registerProcedure' => $this->funct,
                           'protocol'          => $this->protocol);

            // Dipping into XMLWriter to avoid a full end element (</cloud>).

            $action->xw->startElement('cloud');
            foreach ($attrs as $name => $value) {
                $action->xw->writeAttribute($name, $value);
            }

            $action->xw->endElement();
        }
    }

    /**
     * Add an RSSCloud queue item for each notice
     *
     * @param Notice $notice      the notice
     * @param array  &$transports the list of transports (queues)
     *
     * @return boolean hook return
     */

    function onStartEnqueueNotice($notice, &$transports)
    {
        if ($notice->isLocal()) {
            array_push($transports, 'rsscloud');
        }
        return true;
    }

    /**
     * Create the rsscloud_subscription table if it's not
     * already in the DB
     *
     * @return boolean hook return
     */

    function onCheckSchema()
    {
        $schema = Schema::get();
        $schema->ensureTable('rsscloud_subscription',
                             array(new ColumnDef('subscribed', 'integer',
                                                 null, false, 'PRI'),
                                   new ColumnDef('url', 'varchar',
                                                 '255', false, 'PRI'),
                                   new ColumnDef('failures', 'integer',
                                                 null, false, null, 0),
                                   new ColumnDef('created', 'datetime',
                                                 null, false),
                                   new ColumnDef('modified', 'timestamp',
                                                 null, false, null,
                                                 'CURRENT_TIMESTAMP',
                                                 'on update CURRENT_TIMESTAMP')
                                   ));
         return true;
    }

    /**
     * Register RSSCloud notice queue handler
     *
     * @param QueueManager $manager
     *
     * @return boolean hook return
     */
    function onEndInitializeQueueManager($manager)
    {
        $manager->connect('rsscloud', 'RSSCloudQueueHandler');
        return true;
    }

    function onPluginVersion(&$versions)
    {
        $versions[] = array('name' => 'RSSCloud',
                            'version' => RSSCLOUDPLUGIN_VERSION,
                            'author' => 'Zach Copley',
                            'homepage' => 'http://status.net/wiki/Plugin:RSSCloud',
                            'rawdescription' =>
                            _m('The RSSCloud plugin enables your StatusNet instance to publish ' .
                               'real-time updates for profile RSS feeds using the ' .
                               '<a href="http://rsscloud.org/">RSSCloud protocol</a>.'));

        return true;
    }

}
