gnu-social/plugins/OStatus/actions/pushhub.php

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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 WebSub hub; lets us only ping them what need it.
* @package Hub
* @maintainer Brion Vibber <brion@status.net>
*/
if (!defined('STATUSNET')) {
exit(1);
}
/**
* 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);
}
protected function prepare(array $args=array())
{
GNUsocial::setApi(true); // reduce exception reports to aid in debugging
return parent::prepare($args);
}
protected function handle()
{
$mode = $this->trimmed('hub.mode');
switch ($mode) {
case "subscribe":
case "unsubscribe":
$this->subunsub($mode);
break;
case "publish":
// TRANS: Client exception.
throw new ClientException(_m('Publishing outside feeds not supported.'), 400);
default:
// TRANS: Client exception. %s is a mode.
throw new ClientException(sprintf(_m('Unrecognized mode "%s".'),$mode), 400);
}
}
/**
* Process a request for a new or modified WebSub feed subscription.
* If asynchronous verification is requested, updates won't be saved immediately.
*
* HTTP return codes:
* 202 Accepted - request saved and awaiting verification
* 204 No Content - already subscribed
* 400 Bad Request - rejecting this (not specifically spec'd)
*/
function subunsub($mode)
{
$callback = $this->argUrl('hub.callback');
common_debug('New WebSub hub request ('._ve($mode).') for callback '._ve($callback));
$topic = $this->argUrl('hub.topic');
if (!$this->recognizedFeed($topic)) {
common_debug('WebSub hub request had unrecognized feed topic=='._ve($topic));
// TRANS: Client exception. %s is a topic.
throw new ClientException(sprintf(_m('Unsupported hub.topic %s this hub only serves local user and group Atom feeds.'),$topic));
}
$lease = $this->arg('hub.lease_seconds', null);
if ($mode == 'subscribe' && $lease != '' && !preg_match('/^\d+$/', $lease)) {
common_debug('WebSub hub request had invalid lease_seconds=='._ve($lease));
// TRANS: Client exception. %s is the invalid lease value.
throw new ClientException(sprintf(_m('Invalid hub.lease "%s". It must be empty or positive integer.'),$lease));
}
$secret = $this->arg('hub.secret', null);
if ($secret != '' && strlen($secret) >= 200) {
common_debug('WebSub hub request had invalid secret=='._ve($secret));
// TRANS: Client exception. %s is the invalid hub secret.
throw new ClientException(sprintf(_m('Invalid hub.secret "%s". It must be under 200 bytes.'),$secret));
}
$sub = HubSub::getByHashkey($topic, $callback);
if (!$sub instanceof HubSub) {
// Creating a new one!
common_debug('WebSub creating new HubSub entry for topic=='._ve($topic).' to remote callback '._ve($callback));
$sub = new HubSub();
$sub->topic = $topic;
$sub->callback = $callback;
}
if ($mode == 'subscribe') {
if ($secret) {
$sub->secret = $secret;
}
if ($lease) {
$sub->setLease(intval($lease));
}
}
$verify = $this->arg('hub.verify'); // TODO: deprecated
$token = $this->arg('hub.verify_token', null); // TODO: deprecated
if ($verify == 'sync') { // pre-0.4 PuSH
$sub->verify($mode, $token);
header('HTTP/1.1 204 No Content');
} else { // If $verify is not "sync", we might be using WebSub or PuSH 0.4
$sub->scheduleVerify($mode, $token); // If we were certain it's WebSub or PuSH 0.4, token could be removed
header('HTTP/1.1 202 Accepted');
}
}
/**
* Check whether the given URL represents one of our canonical
* user or group Atom feeds.
*
* @param string $feed URL
* @return boolean true if it matches, false if not a recognized local feed
* @throws exception if local entity does not exist
*/
protected function recognizedFeed($feed)
{
$matches = array();
// Simple mapping to local ID for user or group
if (preg_match('!/(\d+)\.atom$!', $feed, $matches)) {
$id = $matches[1];
$params = array('id' => $id, 'format' => 'atom');
// Double-check against locally generated URLs
switch ($feed) {
case common_local_url('ApiTimelineUser', $params):
$user = User::getKV('id', $id);
if (!$user instanceof User) {
// TRANS: Client exception. %s is a feed URL.
throw new ClientException(sprintf(_m('Invalid hub.topic "%s". User does not exist.'),$feed));
}
return true;
case common_local_url('ApiTimelineGroup', $params):
$group = Local_group::getKV('group_id', $id);
if (!$group instanceof Local_group) {
// TRANS: Client exception. %s is a feed URL.
throw new ClientException(sprintf(_m('Invalid hub.topic "%s". Local_group does not exist.'),$feed));
}
return true;
}
common_debug("Feed was not recognized by any local User or Group Atom feed URLs: {$feed}");
return false;
}
// Profile lists are unique per user, so we need both IDs
if (preg_match('!/(\d+)/lists/(\d+)/statuses\.atom$!', $feed, $matches)) {
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$user = $matches[1];
$id = $matches[2];
$params = array('user' => $user, 'id' => $id, 'format' => 'atom');
// Double-check against locally generated URLs
switch ($feed) {
case common_local_url('ApiTimelineList', $params):
$list = Profile_list::getKV('id', $id);
$user = User::getKV('id', $user);
if (!$list instanceof Profile_list || !$user instanceof User || $list->tagger != $user->id) {
// TRANS: Client exception. %s is a feed URL.
throw new ClientException(sprintf(_m('Invalid hub.topic %s; list does not exist.'),$feed));
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}
return true;
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}
common_debug("Feed was not recognized by any local Profile_list Atom feed URL: {$feed}");
return false;
}
common_debug("Unknown feed URL structure, can't match against local user, group or profile_list: {$feed}");
return false;
}
/**
* Grab and validate a URL from POST parameters.
* @throws ClientException for malformed or non-http/https or blacklisted 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'));
$validate = new Validate();
if (!$validate->uri($url, $params)) {
// TRANS: Client exception.
// TRANS: %1$s is this argument to the method this exception occurs in, %2$s is a URL.
throw new ClientException(sprintf(_m('Invalid URL passed for %1$s: "%2$s"'),$arg,$url));
}
Event::handle('UrlBlacklistTest', array($url));
return $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, $callback)
{
return HubSub::getByHashkey($feed, $callback);
}
}