gnu-social/plugins/ActivityPub/actions/apinbox.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
/**
* ActivityPub implementation for GNU social
*
* @package GNUsocial
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @copyright 2018-2019 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
* @link http://www.gnu.org/software/social/
*/
defined('GNUSOCIAL') || die();
/**
* Inbox Request Handler
*
* @category Plugin
* @package GNUsocial
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class apInboxAction extends ManagedAction
{
protected $needLogin = false;
protected $canPost = true;
/**
* Handle the Inbox request
*
* @return void
* @throws ServerException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
protected function handle()
{
$path = !empty($this->trimmed('id')) ? common_local_url('apInbox', ['id' => $this->trimmed('id')]) : common_local_url('apInbox');
$path = parse_url($path, PHP_URL_PATH);
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
ActivityPubReturn::error('Only POST requests allowed.');
}
common_debug('ActivityPub Inbox: Received a POST request.');
$body = $data = file_get_contents('php://input');
common_debug('ActivityPub Inbox: Request contents: '.$data);
$data = json_decode(file_get_contents('php://input'), true);
if (!isset($data['actor'])) {
ActivityPubReturn::error('Actor not found in the request.');
}
$actor = Activitypub_explorer::get_profile_from_url($data['actor']);
$aprofile = Activitypub_profile::from_profile($actor);
$actor_public_key = new Activitypub_rsa();
$actor_public_key = $actor_public_key->ensure_public_key($actor);
common_debug('ActivityPub Inbox: HTTP Signature: Validation will now start!');
$headers = $this->get_all_headers();
common_debug('ActivityPub Inbox: Request Headers: '.print_r($headers, true));
if (!isset($headers['signature'])) {
common_debug('ActivityPub Inbox: HTTP Signature: Missing Signature header.');
ActivityPubReturn::error('Missing Signature header.', 400);
}
// Extract the signature properties
$signatureData = HTTPSignature::parseSignatureHeader($headers['signature']);
common_debug('ActivityPub Inbox: HTTP Signature Data: '.print_r($signatureData, true));
if (isset($signatureData['error'])) {
common_debug('ActivityPub Inbox: HTTP Signature: '.json_encode($signatureData, true));
ActivityPubReturn::error(json_encode($signatureData, true), 400);
}
list($verified, $headers) = HTTPSignature::verify($actor_public_key, $signatureData, $headers, $path, $body);
// If the signature fails verification the first time, update profile as it might have change public key
if($verified !== 1) {
$res = Activitypub_explorer::get_remote_user_activity($aprofile->getUri());
$actor = Activitypub_profile::update_profile($aprofile, $res);
$actor_public_key = new Activitypub_rsa();
$actor_public_key = $actor_public_key->ensure_public_key($actor);
list($verified, $headers) = HTTPSignature::verify($actor_public_key, $signatureData, $headers, $path, $body);
}
// If it still failed despite profile update
if($verified !== 1) {
common_debug('ActivityPub Inbox: HTTP Signature: Invalid signature.');
ActivityPubReturn::error('Invalid signature.');
}
// HTTP signature checked out, make sure the "actor" of the activity matches that of the signature
common_debug('ActivityPub Inbox: HTTP Signature: Authorized request. Will now start the inbox handler.');
try {
new Activitypub_inbox_handler($data, $actor);
ActivityPubReturn::answer();
} catch (Exception $e) {
ActivityPubReturn::error($e->getMessage());
}
}
/**
* Get all HTTP header key/values as an associative array for the current request.
*
* @return array [string] The HTTP header key/value pairs.
* @author PHP Manual Contributed Notes <joyview@gmail.com>
*/
private function get_all_headers()
{
$headers = [];
foreach ($_SERVER as $name => $value) {
if (substr($name, 0, 5) == 'HTTP_') {
$headers[strtolower(str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5))))))] = $value;
}
}
return $headers;
}
}