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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":
$this->subscribe();
break;
case "unsubscribe":
$this->unsubscribe();
break;
case "publish":
throw new ServerException("Publishing outside feeds not supported.", 400);
default:
throw new ServerException("Unrecognized mode '$mode'.", 400);
}
}
/**
* Process a PuSH feed subscription request.
*
* HTTP return codes:
* 202 Accepted - request saved and awaiting verification
* 204 No Content - already subscribed
* 403 Forbidden - rejecting this (not specifically spec'd)
*/
function subscribe()
{
$feed = $this->argUrl('hub.topic');
$callback = $this->argUrl('hub.callback');
$token = $this->arg('hub.verify_token', null);
common_log(LOG_DEBUG, __METHOD__ . ": checking sub'd to $feed $callback");
if ($this->getSub($feed, $callback)) {
// Already subscribed; return 204 per spec.
header('HTTP/1.1 204 No Content');
common_log(LOG_DEBUG, __METHOD__ . ': already subscribed');
return;
}
common_log(LOG_DEBUG, __METHOD__ . ': setting up');
$sub = new HubSub();
$sub->topic = $feed;
$sub->callback = $callback;
$sub->secret = $this->arg('hub.secret', null);
if (strlen($sub->secret) > 200) {
throw new ClientException("hub.secret must be no longer than 200 chars", 400);
}
$sub->setLease(intval($this->arg('hub.lease_seconds')));
// @fixme check for feeds we don't manage
// @fixme check the verification mode, might want a return immediately?
common_log(LOG_DEBUG, __METHOD__ . ': inserting');
$ok = $sub->insert();
if (!$ok) {
throw new ServerException("Failed to save subscription record", 500);
}
// @fixme check errors ;)
$data = array('sub' => $sub, 'mode' => 'subscribe', 'token' => $token);
$qm = QueueManager::get();
$qm->enqueue($data, 'hubverify');
header('HTTP/1.1 202 Accepted');
common_log(LOG_DEBUG, __METHOD__ . ': done');
}
/**
* Process a PuSH feed unsubscription request.
*
* HTTP return codes:
* 202 Accepted - request saved and awaiting verification
* 204 No Content - already subscribed
* 400 Bad Request - invalid params or rejected feed
*
* @fixme background this
*/
function unsubscribe()
{
$feed = $this->argUrl('hub.topic');
$callback = $this->argUrl('hub.callback');
$sub = $this->getSub($feed, $callback);
if ($sub) {
$token = $this->arg('hub.verify_token', null);
if ($sub->verify('unsubscribe', $token)) {
$sub->delete();
common_log(LOG_INFO, "PuSH unsubscribed $feed for $callback");
} else {
throw new ServerException("Failed PuSH unsubscription: verification failed! $feed for $callback");
}
} else {
throw new ServerException("Failed PuSH unsubscription: not subscribed! $feed for $callback");
}
}
/**
* Grab and validate a URL from POST parameters.
* @throws ServerException for malformed or non-http/https URLs
*/
protected function argUrl($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 ServerException("Invalid URL passed for $arg: '$url'", 400);
}
}
/**
* 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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