349 lines
9.4 KiB
PHP
349 lines
9.4 KiB
PHP
<?php
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/**
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* Action to let RSSCloud aggregators request update notification when
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* user profile feeds change.
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*
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* PHP version 5
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*
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* @category Plugin
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* @package StatusNet
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* @author Zach Copley <zach@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
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* @link http://status.net/
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*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2009, StatusNet, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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if (!defined('STATUSNET')) {
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exit(1);
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}
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/**
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* Action class to handle RSSCloud notification (subscription) requests
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*
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* @category Plugin
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* @package StatusNet
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* @author Zach Copley <zach@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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**/
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class RSSCloudRequestNotifyAction extends Action
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{
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/**
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* Initialization.
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*
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* @param array $args Web and URL arguments
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*
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* @return boolean false if user doesn't exist
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*/
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function prepare($args)
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{
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parent::prepare($args);
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$this->ip = $_SERVER['REMOTE_ADDR'];
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$this->port = $this->arg('port');
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$this->path = $this->arg('path');
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if ($this->path[0] != '/') {
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$this->path = '/' . $this->path;
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}
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$this->protocol = $this->arg('protocol');
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$this->procedure = $this->arg('notifyProcedure');
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$this->domain = $this->arg('domain');
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$this->feeds = $this->getFeeds();
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return true;
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}
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/**
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* Handle the request
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*
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* Checks for all the required parameters for a subscription,
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* validates that the feed being subscribed to is real, and then
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* saves the subsctiption.
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*
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* @param array $args $_REQUEST data (unused)
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*
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* @return void
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*/
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function handle($args)
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{
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parent::handle($args);
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if ($_SERVER['REQUEST_METHOD'] != 'POST') {
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$this->showResult(false, 'Request must be POST.');
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return;
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}
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$missing = array();
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if (empty($this->port)) {
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$missing[] = 'port';
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}
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if (empty($this->path)) {
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$missing[] = 'path';
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}
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if (empty($this->protocol)) {
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$missing[] = 'protocol';
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} else if (strtolower($this->protocol) != 'http-post') {
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$msg = 'Only http-post notifications are supported at this time.';
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$this->showResult(false, $msg);
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return;
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}
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if (!isset($this->procedure)) {
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$missing[] = 'notifyProcedure';
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}
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if (!empty($missing)) {
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$msg = 'The following parameters were missing from the request body: ' .
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implode(', ', $missing) . '.';
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$this->showResult(false, $msg);
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return;
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}
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if (empty($this->feeds)) {
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$msg = 'You must provide at least one valid profile feed url ' .
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'(url1, url2, url3 ... urlN).';
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$this->showResult(false, $msg);
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return;
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}
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// We have to validate everything before saving anything.
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// We only return one success or failure no matter how
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// many feeds the subscriber is trying to subscribe to
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foreach ($this->feeds as $feed) {
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if (!$this->validateFeed($feed)) {
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$nh = $this->getNotifyUrl();
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common_log(LOG_WARNING,
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"RSSCloud plugin - $nh tried to subscribe to invalid feed: $feed");
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$msg = 'Feed subscription failed - Not a valid feed.';
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$this->showResult(false, $msg);
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return;
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}
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if (!$this->testNotificationHandler($feed)) {
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$msg = 'Feed subscription failed - ' .
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'notification handler doesn\'t respond correctly.';
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$this->showResult(false, $msg);
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return;
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}
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}
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foreach ($this->feeds as $feed) {
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$this->saveSubscription($feed);
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}
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// XXX: What to do about deleting stale subscriptions?
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// 25 hours seems harsh. WordPress doesn't ever remove
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// subscriptions.
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$msg = 'Thanks for the subscription. ' .
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'When the feed(s) update(s) we\'ll notify you.';
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$this->showResult(true, $msg);
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}
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/**
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* Validate that the requested feed is one we serve
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* up via RSSCloud.
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*
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* @param string $feed the feed in question
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*
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* @return void
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*/
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function validateFeed($feed)
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{
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$user = $this->userFromFeed($feed);
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if (empty($user)) {
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return false;
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}
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return true;
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}
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/**
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* Pull all of the urls (url1, url2, url3...urlN) that
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* the subscriber wants to subscribe to.
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*
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* @return array $feeds the list of feeds
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*/
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function getFeeds()
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{
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$feeds = array();
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while (list($key, $feed) = each($this->args)) {
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if (preg_match('/^url\d*$/', $key)) {
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$feeds[] = $feed;
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}
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}
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return $feeds;
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}
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/**
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* Test that a notification handler is there and is reponding
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* correctly. This is called before adding a subscription.
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*
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* @param string $feed the feed to verify
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*
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* @return boolean success result
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*/
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function testNotificationHandler($feed)
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{
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$notifyUrl = $this->getNotifyUrl();
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$notifier = new RSSCloudNotifier();
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if (isset($this->domain)) {
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// 'domain' param set, so we have to use GET and send a challenge
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common_log(LOG_INFO,
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'RSSCloud plugin - Testing notification handler with challenge: ' .
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$notifyUrl);
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return $notifier->challenge($notifyUrl, $feed);
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} else {
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common_log(LOG_INFO, 'RSSCloud plugin - Testing notification handler: ' .
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$notifyUrl);
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return $notifier->postUpdate($notifyUrl, $feed);
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}
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}
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/**
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* Build the URL for the notification handler based on the
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* parameters passed in with the subscription request.
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*
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* @return string notification handler url
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*/
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function getNotifyUrl()
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{
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if (isset($this->domain)) {
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return 'http://' . $this->domain . ':' . $this->port . $this->path;
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} else {
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return 'http://' . $this->ip . ':' . $this->port . $this->path;
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}
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}
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/**
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* Uses the nickname part of the subscribed feed URL to figure out
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* whethere there's really a user with such a feed. Used to
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* validate feeds before adding a subscription.
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*
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* @param string $feed the feed in question
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*
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* @return boolean success
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*/
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function userFromFeed($feed)
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{
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// We only do canonical RSS2 profile feeds (specified by ID), e.g.:
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// http://www.example.com/api/statuses/user_timeline/2.rss
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$path = common_path('api/statuses/user_timeline/');
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$valid = '%^' . $path . '(?<id>.*)\.rss$%';
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if (preg_match($valid, $feed, $matches)) {
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$user = User::staticGet('id', $matches['id']);
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if (!empty($user)) {
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return $user;
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}
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}
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return false;
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}
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/**
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* Save an RSSCloud subscription
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*
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* @param string $feed a valid profile feed
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*
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* @return boolean success result
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*/
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function saveSubscription($feed)
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{
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$user = $this->userFromFeed($feed);
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$notifyUrl = $this->getNotifyUrl();
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$sub = RSSCloudSubscription::getSubscription($user->id, $notifyUrl);
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if ($sub) {
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common_log(LOG_INFO, "RSSCloud plugin - $notifyUrl refreshed subscription" .
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" to user $user->nickname (id: $user->id).");
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} else {
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$sub = new RSSCloudSubscription();
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$sub->subscribed = $user->id;
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$sub->url = $notifyUrl;
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$sub->created = common_sql_now();
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if (!$sub->insert()) {
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common_log_db_error($sub, 'INSERT', __FILE__);
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return false;
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}
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common_log(LOG_INFO, "RSSCloud plugin - $notifyUrl subscribed" .
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" to user $user->nickname (id: $user->id)");
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}
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return true;
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}
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/**
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* Show an XML message indicating the subscription
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* was successful or failed.
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*
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* @param boolean $success whether it was good or bad
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* @param string $msg the message to output
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*
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* @return boolean success result
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*/
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function showResult($success, $msg)
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{
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$this->startXML();
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$this->elementStart('notifyResult',
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array('success' => ($success) ? 'true' : 'false',
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'msg' => $msg));
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$this->endXML();
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}
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}
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