ab4113168f
Among other things (such as permanent subscriptions), Pubsubhubbub 0.4
removed the "sync" verification method. This means that any incoming
PuSH subscription requests that follow the 0.4 spec won't really
_require_that we handle it as a background process, but if we were to
try direct verification of the subscription - and fail - there's no way
we could pick up the ball again. So _essentially_ we require background
processing with retries.
This means we must implement something like the "poorman cron" or
similar, so background processing can be handled
on-demand/on-site-visit. This is how Friendica, Drupal etc. handles it
and is necessary for environments where we can't run separate queue
daemons.
When the poorman-cron-ish thing is implemented, auto-renewal will work
for all users.
PuSH 0.4 spec:
https://pubsubhubbub.googlecode.com/git/pubsubhubbub-core-0.4.html
More on PuSH 0.4 release (incl. breaking changes):
https://groups.google.com/forum/#!msg/pubsubhubbub/7RPlYMds4RI/2mIHQTdV3aoJ
126 lines
4.5 KiB
PHP
126 lines
4.5 KiB
PHP
<?php
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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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/**
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* @package FeedSubPlugin
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* @maintainer Brion Vibber <brion@status.net>
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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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class PushCallbackAction extends Action
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{
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protected function handle()
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{
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StatusNet::setApi(true); // Minimize error messages to aid in debugging
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parent::handle();
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if ($this->isPost()) {
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return $this->handlePost();
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}
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return $this->handleGet();
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}
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/**
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* Handler for POST content updates from the hub
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*/
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function handlePost()
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{
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$feedid = $this->arg('feed');
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common_log(LOG_INFO, "POST for feed id $feedid");
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if (!$feedid) {
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// TRANS: Server exception thrown when referring to a non-existing or empty feed.
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throw new ServerException(_m('Empty or invalid feed id.'), 400);
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}
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$feedsub = FeedSub::getKV('id', $feedid);
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if (!$feedsub) {
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// TRANS: Server exception. %s is a feed ID.
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throw new ServerException(sprintf(_m('Unknown PuSH feed id %s'),$feedid), 400);
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}
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$hmac = '';
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if (isset($_SERVER['HTTP_X_HUB_SIGNATURE'])) {
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$hmac = $_SERVER['HTTP_X_HUB_SIGNATURE'];
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}
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$post = file_get_contents('php://input');
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// Queue this to a background process; we should return
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// as quickly as possible from a distribution POST.
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// If queues are disabled this'll process immediately.
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$data = array('feedsub_id' => $feedsub->id,
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'post' => $post,
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'hmac' => $hmac);
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$qm = QueueManager::get();
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$qm->enqueue($data, 'pushin');
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}
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/**
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* Handler for GET verification requests from the hub.
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*/
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function handleGet()
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{
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$mode = $this->arg('hub_mode');
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$topic = $this->arg('hub_topic');
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$challenge = $this->arg('hub_challenge');
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$lease_seconds = $this->arg('hub_lease_seconds'); // Must be >0 for PuSH 0.4!
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common_log(LOG_INFO, __METHOD__ . ": sub verification mode: $mode topic: $topic challenge: $challenge lease_seconds: $lease_seconds");
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if ($mode != 'subscribe' && $mode != 'unsubscribe') {
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// TRANS: Client exception. %s is an invalid value for hub.mode.
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throw new ClientException(sprintf(_m('Bad hub.mode "$s".',$mode)), 404);
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}
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$feedsub = FeedSub::getKV('uri', $topic);
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if (!$feedsub instanceof FeedSub) {
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// TRANS: Client exception. %s is an invalid feed name.
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throw new ClientException(sprintf(_m('Bad hub.topic feed "%s".'),$topic), 404);
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}
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if ($mode == 'subscribe') {
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// We may get re-sub requests legitimately.
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if ($feedsub->sub_state != 'subscribe' && $feedsub->sub_state != 'active') {
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// TRANS: Client exception. %s is an invalid topic.
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throw new ClientException(sprintf(_m('Unexpected subscribe request for %s.'),$topic), 404);
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}
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} else {
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if ($feedsub->sub_state != 'unsubscribe') {
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// TRANS: Client exception. %s is an invalid topic.
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throw new ClientException(sprintf(_m('Unexpected unsubscribe request for %s.'),$topic), 404);
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}
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}
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if ($mode == 'subscribe') {
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if ($feedsub->sub_state == 'active') {
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common_log(LOG_INFO, __METHOD__ . ': sub update confirmed');
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} else {
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common_log(LOG_INFO, __METHOD__ . ': sub confirmed');
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}
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$feedsub->confirmSubscribe($lease_seconds);
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} else {
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common_log(LOG_INFO, __METHOD__ . ": unsub confirmed; deleting sub record for $topic");
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$feedsub->confirmUnsubscribe();
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}
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print $challenge;
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}
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}
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