gnu-social/plugins/RSSCloud/RSSCloudRequestNotify.php

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<?php
/**
* Action to let RSSCloud aggregators request update notification when
* user profile feeds change.
*
* PHP version 5
*
* @category Plugin
* @package StatusNet
* @author Zach Copley <zach@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
* @link http://status.net/
*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2009, StatusNet, Inc.
*
* 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/>.
*/
if (!defined('STATUSNET')) {
exit(1);
}
/**
* Action class to handle RSSCloud notification (subscription) requests
*
* @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 RSSCloudRequestNotifyAction extends Action
{
/**
* Initialization.
*
* @param array $args Web and URL arguments
*
* @return boolean false if user doesn't exist
*/
function prepare($args)
{
parent::prepare($args);
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$this->ip = $_SERVER['REMOTE_ADDR'];
$this->port = $this->arg('port');
$this->path = $this->arg('path');
if ($this->path[0] != '/') {
$this->path = '/' . $this->path;
}
$this->protocol = $this->arg('protocol');
$this->procedure = $this->arg('notifyProcedure');
$this->domain = $this->arg('domain');
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$this->feeds = $this->getFeeds();
return true;
}
/**
* Handle the request
*
* Checks for all the required parameters for a subscription,
* validates that the feed being subscribed to is real, and then
* saves the subsctiption.
*
* @param array $args $_REQUEST data (unused)
*
* @return void
*/
function handle($args)
{
parent::handle($args);
if ($_SERVER['REQUEST_METHOD'] != 'POST') {
$this->showResult(false, 'Request must be POST.');
return;
}
$missing = array();
if (empty($this->port)) {
$missing[] = 'port';
}
if (empty($this->path)) {
$missing[] = 'path';
}
if (empty($this->protocol)) {
$missing[] = 'protocol';
} else if (strtolower($this->protocol) != 'http-post') {
$msg = 'Only http-post notifications are supported at this time.';
$this->showResult(false, $msg);
return;
}
if (!isset($this->procedure)) {
$missing[] = 'notifyProcedure';
}
if (!empty($missing)) {
$msg = 'The following parameters were missing from the request body: ' .
implode(', ', $missing) . '.';
$this->showResult(false, $msg);
return;
}
if (empty($this->feeds)) {
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$msg = 'You must provide at least one valid profile feed url ' .
'(url1, url2, url3 ... urlN).';
$this->showResult(false, $msg);
return;
}
// We have to validate everything before saving anything.
// We only return one success or failure no matter how
// many feeds the subscriber is trying to subscribe to
foreach ($this->feeds as $feed) {
if (!$this->validateFeed($feed)) {
$msg = 'Feed subscription failed - Not a valid feed.';
$this->showResult(false, $msg);
return;
}
if (!$this->testNotificationHandler($feed)) {
$msg = 'Feed subscription failed - ' .
'notification handler doesn\'t respond correctly.';
$this->showResult(false, $msg);
return;
}
}
foreach ($this->feeds as $feed) {
$this->saveSubscription($feed);
}
// XXX: What to do about deleting stale subscriptions?
// 25 hours seems harsh. WordPress doesn't ever remove
// subscriptions.
$msg = 'Thanks for the subscription. ' .
'When the feed(s) update(s) we\'ll notify you.';
$this->showResult(true, $msg);
}
/**
* Validate that the requested feed is one we serve
* up via RSSCloud.
*
* @param string $feed the feed in question
*
* @return void
*/
function validateFeed($feed)
{
$user = $this->userFromFeed($feed);
if (empty($user)) {
return false;
}
return true;
}
/**
* Pull all of the urls (url1, url2, url3...urlN) that
* the subscriber wants to subscribe to.
*
* @return array $feeds the list of feeds
*/
function getFeeds()
{
$feeds = array();
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while (list($key, $feed) = each($this->args)) {
if (preg_match('/^url\d*$/', $key)) {
$feeds[] = $feed;
}
}
return $feeds;
}
/**
* Test that a notification handler is there and is reponding
* correctly. This is called before adding a subscription.
*
* @param string $feed the feed to verify
*
* @return boolean success result
*/
function testNotificationHandler($feed)
{
common_debug("RSSCloudPlugin - testNotificationHandler()");
$notifyUrl = $this->getNotifyUrl();
$notifier = new RSSCloudNotifier();
if (isset($this->domain)) {
// 'domain' param set, so we have to use GET and send a challenge
common_log(LOG_INFO, 'Testing notification handler with challenge: ' .
$notifyUrl);
return $notifier->challenge($notifyUrl, $feed);
} else {
common_log(LOG_INFO, 'Testing notification handler: ' .
$notifyUrl);
return $notifier->postUpdate($notifyUrl, $feed);
}
}
/**
* Build the URL for the notification handler based on the
* parameters passed in with the subscription request.
*
* @return string notification handler url
*/
function getNotifyUrl()
{
if (isset($this->domain)) {
return 'http://' . $this->domain . ':' . $this->port . $this->path;
} else {
return 'http://' . $this->ip . ':' . $this->port . $this->path;
}
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}
/**
* Uses the nickname part of the subscribed feed URL to figure out
* whethere there's really a user with such a feed. Used to
* validate feeds before adding a subscription.
*
* @param string $feed the feed in question
*
* @return boolean success
*/
function userFromFeed($feed)
{
// We only do profile feeds
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$path = common_path('api/statuses/user_timeline/');
$valid = '%^' . $path . '(?<nickname>.*)\.rss$%';
if (preg_match($valid, $feed, $matches)) {
$user = User::staticGet('nickname', $matches['nickname']);
if (!empty($user)) {
return $user;
}
}
return false;
}
/**
* Save an RSSCloud subscription
*
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* @param string $feed a valid profile feed
*
* @return boolean success result
*/
function saveSubscription($feed)
{
$user = $this->userFromFeed($feed);
$notifyUrl = $this->getNotifyUrl();
$sub = RSSCloudSubscription::getSubscription($user->id, $notifyUrl);
if ($sub) {
common_debug("Already subscribed to that!");
} else {
$sub = new RSSCloudSubscription();
$sub->subscribed = $user->id;
$sub->url = $notifyUrl;
$sub->created = common_sql_now();
if (!$sub->insert()) {
common_log_db_error($sub, 'INSERT', __FILE__);
return false;
}
}
return true;
}
/**
* Show an XML message indicating the subscription
* was successful or failed.
*
* @param boolean $success whether it was good or bad
* @param string $msg the message to output
*
* @return boolean success result
*/
function showResult($success, $msg)
{
$this->startXML();
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$this->elementStart('notifyResult',
array('success' => ($success) ? 'true' : 'false',
'msg' => $msg));
$this->endXML();
}
}