friendica/mod/pubsub.php

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<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @license GNU AGPL version 3 or any later version
*
* 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 <https://www.gnu.org/licenses/>.
*
*/
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use Friendica\App;
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use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\Contact;
use Friendica\Protocol\OStatus;
use Friendica\Util\Strings;
use Friendica\Util\Network;
use Friendica\Model\GServer;
use Friendica\Model\Post;
function hub_return($valid, $body)
{
if ($valid) {
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echo $body;
} else {
throw new \Friendica\Network\HTTPException\NotFoundException();
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}
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exit();
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}
// when receiving an XML feed, always return OK
function hub_post_return()
{
throw new \Friendica\Network\HTTPException\OKException();
}
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function pubsub_init(App $a)
{
$nick = (($a->argc > 1) ? Strings::escapeTags(trim($a->argv[1])) : '');
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$contact_id = (($a->argc > 2) ? intval($a->argv[2]) : 0 );
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if ($_SERVER['REQUEST_METHOD'] === 'GET') {
$hub_mode = Strings::escapeTags(trim($_GET['hub_mode'] ?? ''));
$hub_topic = Strings::escapeTags(trim($_GET['hub_topic'] ?? ''));
$hub_challenge = Strings::escapeTags(trim($_GET['hub_challenge'] ?? ''));
$hub_verify = Strings::escapeTags(trim($_GET['hub_verify_token'] ?? ''));
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Logger::log('Subscription from ' . $_SERVER['REMOTE_ADDR'] . ' Mode: ' . $hub_mode . ' Nick: ' . $nick);
Logger::log('Data: ' . print_r($_GET,true), Logger::DATA);
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$subscribe = (($hub_mode === 'subscribe') ? 1 : 0);
$owner = DBA::selectFirst('user', ['uid'], ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false]);
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if (!DBA::isResult($owner)) {
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Logger::log('Local account not found: ' . $nick);
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hub_return(false, '');
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}
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$condition = ['uid' => $owner['uid'], 'id' => $contact_id, 'blocked' => false, 'pending' => false];
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if (!empty($hub_verify)) {
$condition['hub-verify'] = $hub_verify;
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}
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$contact = DBA::selectFirst('contact', ['id', 'poll'], $condition);
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if (!DBA::isResult($contact)) {
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Logger::log('Contact ' . $contact_id . ' not found.');
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hub_return(false, '');
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}
if (!empty($hub_topic) && !Strings::compareLink($hub_topic, $contact['poll'])) {
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Logger::log('Hub topic ' . $hub_topic . ' != ' . $contact['poll']);
hub_return(false, '');
}
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// We must initiate an unsubscribe request with a verify_token.
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// Don't allow outsiders to unsubscribe us.
if (($hub_mode === 'unsubscribe') && empty($hub_verify)) {
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Logger::log('Bogus unsubscribe');
hub_return(false, '');
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}
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if (!empty($hub_mode)) {
DBA::update('contact', ['subhub' => $subscribe], ['id' => $contact['id']]);
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Logger::log($hub_mode . ' success for contact ' . $contact_id . '.');
}
hub_return(true, $hub_challenge);
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}
}
function pubsub_post(App $a)
{
$xml = Network::postdata();
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Logger::log('Feed arrived from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . DI::args()->getCommand() . ' with user-agent: ' . $_SERVER['HTTP_USER_AGENT']);
Logger::log('Data: ' . $xml, Logger::DATA);
$nick = (($a->argc > 1) ? Strings::escapeTags(trim($a->argv[1])) : '');
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$contact_id = (($a->argc > 2) ? intval($a->argv[2]) : 0 );
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$importer = DBA::selectFirst('user', [], ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false]);
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if (!DBA::isResult($importer)) {
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hub_post_return();
}
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$condition = ['id' => $contact_id, 'uid' => $importer['uid'], 'subhub' => true, 'blocked' => false];
$contact = DBA::selectFirst('contact', [], $condition);
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if (!DBA::isResult($contact)) {
$author = OStatus::salmonAuthor($xml, $importer);
if (!empty($author['contact-id'])) {
$condition = ['id' => $author['contact-id'], 'uid' => $importer['uid'], 'subhub' => true, 'blocked' => false];
$contact = DBA::selectFirst('contact', [], $condition);
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Logger::log('No record for ' . $nick .' with contact id ' . $contact_id . ' - using '.$author['contact-id'].' instead.');
}
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if (!DBA::isResult($contact)) {
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Logger::log('Contact ' . $author["author-link"] . ' (' . $contact_id . ') for user ' . $nick . " wasn't found - ignored. XML: " . $xml);
hub_post_return();
}
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}
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if (!empty($contact['gsid'])) {
GServer::setProtocol($contact['gsid'], Post\DeliveryData::OSTATUS);
}
if (!in_array($contact['rel'], [Contact::SHARING, Contact::FRIEND]) && ($contact['network'] != Protocol::FEED)) {
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Logger::log('Contact ' . $contact['id'] . ' is not expected to share with us - ignored.');
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hub_post_return();
}
// We only import feeds from OStatus here
if ($contact['network'] != Protocol::OSTATUS) {
Logger::warning('Unexpected network', ['contact' => $contact]);
hub_post_return();
}
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Logger::log('Import item for ' . $nick . ' from ' . $contact['nick'] . ' (' . $contact['id'] . ')');
$feedhub = '';
OStatus::import($xml, $importer, $contact, $feedhub);
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hub_post_return();
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}