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<?php
/*
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, 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/>.
*/
/**
* Integrated PuSH hub; lets us only ping them what need it.
* @package Hub
* @maintainer Brion Vibber <brion@status.net>
*/
/**
Things to consider...
* should we purge incomplete subscriptions that never get a verification pingback?
* when can we send subscription renewal checks?
- at next send time probably ok
* when can we handle trimming of subscriptions?
- at next send time probably ok
* should we keep a fail count?
*/
class PushHubAction extends Action
{
function arg($arg, $def=null)
{
// PHP converts '.'s in incoming var names to '_'s.
// It also merges multiple values, which'll break hub.verify and hub.topic for publishing
// @fixme handle multiple args
$arg = str_replace('hub.', 'hub_', $arg);
return parent::arg($arg, $def);
}
function prepare($args)
{
StatusNet::setApi(true); // reduce exception reports to aid in debugging
return parent::prepare($args);
}
function handle()
{
$mode = $this->trimmed('hub.mode');
switch ($mode) {
case "subscribe":
case "unsubscribe":
$this->subunsub($mode);
break;
case "publish":
throw new ClientException("Publishing outside feeds not supported.", 400);
default:
throw new ClientException("Unrecognized mode '$mode'.", 400);
}
}
/**
* Process a request for a new or modified PuSH feed subscription.
* If asynchronous verification is requested, updates won't be saved immediately.
*
* HTTP return codes:
* 202 Accepted - request saved and awaiting verification
* 204 No Content - already subscribed
* 400 Bad Request - rejecting this (not specifically spec'd)
*/
function subunsub($mode)
{
$callback = $this->argUrl('hub.callback');
$topic = $this->argUrl('hub.topic');
if (!$this->recognizedFeed($topic)) {
throw new ClientException("Unsupported hub.topic $topic; this hub only serves local user and group Atom feeds.");
}
$verify = $this->arg('hub.verify'); // @fixme may be multiple
if ($verify != 'sync' && $verify != 'async') {
throw new ClientException("Invalid hub.verify $verify; must be sync or async.");
}
$lease = $this->arg('hub.lease_seconds', null);
if ($mode == 'subscribe' && $lease != '' && !preg_match('/^\d+$/', $lease)) {
throw new ClientException("Invalid hub.lease $lease; must be empty or positive integer.");
}
$token = $this->arg('hub.verify_token', null);
$secret = $this->arg('hub.secret', null);
if ($secret != '' && strlen($secret) >= 200) {
throw new ClientException("Invalid hub.secret $secret; must be under 200 bytes.");
}
$sub = HubSub::staticGet($sub->topic, $sub->callback);
if (!$sub) {
// Creating a new one!
$sub = new HubSub();
$sub->topic = $topic;
$sub->callback = $callback;
}
if ($mode == 'subscribe') {
if ($secret) {
$sub->secret = $secret;
}
if ($lease) {
$sub->setLease(intval($lease));
}
}
if (!common_config('queue', 'enabled')) {
// Won't be able to background it.
$verify = 'sync';
}
if ($verify == 'async') {
$sub->scheduleVerify($mode, $token);
header('HTTP/1.1 202 Accepted');
} else {
$sub->verify($mode, $token);
header('HTTP/1.1 204 No Content');
}
}
/**
* Check whether the given URL represents one of our canonical
* user or group Atom feeds.
*
* @param string $feed URL
* @return boolean true if it matches
*/
function recognizedFeed($feed)
{
$matches = array();
if (preg_match('!/(\d+)\.atom$!', $feed, $matches)) {
$id = $matches[1];
$params = array('id' => $id, 'format' => 'atom');
$userFeed = common_local_url('ApiTimelineUser', $params);
$groupFeed = common_local_url('ApiTimelineGroup', $params);
if ($feed == $userFeed) {
$user = User::staticGet('id', $id);
if (!$user) {
throw new ClientException("Invalid hub.topic $feed; user doesn't exist.");
} else {
return true;
}
}
if ($feed == $groupFeed) {
$user = User_group::staticGet('id', $id);
if (!$user) {
throw new ClientException("Invalid hub.topic $feed; group doesn't exist.");
} else {
return true;
}
}
common_log(LOG_DEBUG, "Not a user or group feed? $feed $userFeed $groupFeed");
}
common_log(LOG_DEBUG, "LOST $feed");
return false;
}
/**
* Grab and validate a URL from POST parameters.
* @throws ClientException for malformed or non-http/https URLs
*/
protected function argUrl($arg)
{
$url = $this->arg($arg);
$params = array('domain_check' => false, // otherwise breaks my local tests :P
'allowed_schemes' => array('http', 'https'));
if (Validate::uri($url, $params)) {
return $url;
} else {
throw new ClientException("Invalid URL passed for $arg: '$url'");
}
}
/**
* Get HubSub subscription record for a given feed & subscriber.
*
* @param string $feed
* @param string $callback
* @return mixed HubSub or false
*/
protected function getSub($feed, $callback)
{
return HubSub::staticGet($feed, $callback);
}
}
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