<?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();
/**
* ActivityPub's own Postman
*
* Standard workflow expects that we send an Explorer to find out destinataries'
* inbox address. Then we send our postman to deliver whatever we want to send them.
*
* @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 Activitypub_postman
{
private $actor;
private $actor_uri;
private $to = [];
private $failed_to = [];
private $client;
private $headers;
/**
* Create a postman to deliver something to someone
*
* @param Profile $from sender Profile
* @param array $to receiver AProfiles
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function __construct(Profile $from, array $to = [])
{
$this->actor = $from;
$this->to = $to;
$this->actor_uri = $this->actor->getUri();
$this->client = new HTTPClient();
}
/**
* When dear postman dies, resurrect him until he finishes what he couldn't in life
*
* @throws ServerException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function __destruct()
{
$qm = QueueManager::get();
foreach($this->failed_to as $to => $activity) {
$qm->enqueue([$to, $activity], 'activitypub_failed');
}
}
/**
* Send something to remote instance
*
* @param string $data request body
* @param string $inbox url of remote inbox
* @param string $method request method
* @return GNUsocial_HTTPResponse
* @throws HTTP_Request2_Exception
* @throws HTTP_Request2_LogicException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function send($data, $inbox, $method = 'POST')
{
common_debug('ActivityPub Postman: Delivering '.$data.' to '.$inbox);
$headers = HttpSignature::sign($this->actor, $inbox, $data);
common_debug('ActivityPub Postman: Delivery headers were: '.print_r($headers, true));
$this->client->setBody($data);
switch ($method) {
case 'POST':
$response = $this->client->post($inbox, $headers);
break;
case 'GET':
$response = $this->client->get($inbox, $headers);
break;
default:
throw new Exception("Unsupported request method for postman.");
}
common_debug('ActivityPub Postman: Delivery result with status code '.$response->getStatus().': '.$response->getBody());
return $response;
}
/**
* Send a follow notification to remote instance
*
* @return bool
* @throws HTTP_Request2_Exception
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function follow()
{
$data = Activitypub_follow::follow_to_array($this->actor_uri, $this->to[0]->getUrl());
$res = $this->send(json_encode($data, JSON_UNESCAPED_SLASHES), $this->to[0]->get_inbox());
$res_body = json_decode($res->getBody(), true);
if ($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409) {
$pending_list = new Activitypub_pending_follow_requests($this->actor->getID(), $this->to[0]->getID());
$pending_list->add();
return true;
} elseif (isset($res_body['error'])) {
throw new Exception($res_body['error']);
}
throw new Exception("An unknown error occurred.");
}
/**
* Send a Undo Follow notification to remote instance
*
* @return bool
* @throws HTTP_Request2_Exception
* @throws Exception
* @throws Exception
* @throws Exception
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function undo_follow()
{
$data = Activitypub_undo::undo_to_array(
Activitypub_follow::follow_to_array(
$this->actor_uri,
$this->to[0]->getUrl()
)
);
$res = $this->send(json_encode($data, JSON_UNESCAPED_SLASHES), $this->to[0]->get_inbox());
$res_body = json_decode($res->getBody(), true);
if ($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409) {
Activitypub_profile::unsubscribeCacheUpdate($this->actor, $this->to[0]->local_profile());
$pending_list = new Activitypub_pending_follow_requests($this->actor->getID(), $this->to[0]->getID());
$pending_list->remove();
return true;
}
if (isset($res_body['error'])) {
throw new Exception($res_body['error']);
}
throw new Exception("An unknown error occurred.");
}
/**
* Send a Accept Follow notification to remote instance
*
* @param string $id Follow activity id
* @return bool
* @throws HTTP_Request2_Exception
* @throws Exception Description of HTTP Response error or generic error message.
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function accept_follow(string $id): bool
{
$data = Activitypub_accept::accept_to_array(
Activitypub_follow::follow_to_array(
$this->to[0]->getUrl(),
$this->actor_uri,
$id
)
);
$res = $this->send(json_encode($data, JSON_UNESCAPED_SLASHES), $this->to[0]->get_inbox());
$res_body = json_decode($res->getBody(), true);
if ($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409) {
$pending_list = new Activitypub_pending_follow_requests($this->to[0]->getID(), $this->actor->getID());
$pending_list->remove();
return true;
}
if (isset($res_body['error'])) {
throw new Exception($res_body['error']);
}
throw new Exception("An unknown error occurred.");
}
/**
* Send a Like notification to remote instances holding the notice
*
* @param Notice $notice
* @throws HTTP_Request2_Exception
* @throws InvalidUrlException
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function like(Notice $notice): void
{
$data = Activitypub_like::like_to_array(
$this->actor_uri,
$notice
);
$data = json_encode($data, JSON_UNESCAPED_SLASHES);
foreach ($this->to_inbox() as $inbox) {
try {
$res = $this->send($data, $inbox);
// accumulate errors for later use, if needed
if (!($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409)) {
$res_body = json_decode($res->getBody(), true);
$errors[] = isset($res_body['error']) ?
$res_body['error'] : "An unknown error occurred.";
$to_failed[$inbox] = $notice;
}
} catch (Exception $e){
$to_failed[$inbox] = $notice;
}
}
if (!empty($errors)) {
common_log(LOG_ERR, sizeof($errors) . " instance/s failed to handle the like activity!");
}
}
/**
* Send a Undo Like notification to remote instances holding the notice
*
* @param Notice $notice
* @throws HTTP_Request2_Exception
* @throws InvalidUrlException
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function undo_like($notice)
{
$data = Activitypub_undo::undo_to_array(
Activitypub_like::like_to_array(
$this->actor_uri,
$notice
)
);
$data = json_encode($data, JSON_UNESCAPED_SLASHES);
foreach ($this->to_inbox() as $inbox) {
try {
$res = $this->send($data, $inbox);
// accummulate errors for later use, if needed
if (!($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409)) {
$res_body = json_decode($res->getBody(), true);
$errors[] = isset($res_body['error']) ?
$res_body['error'] : "An unknown error occurred.";
$to_failed[$inbox] = $notice;
}
} catch (Exception $e) {
$to_failed[$inbox] = $notice;
}
}
if (!empty($errors)) {
common_log(LOG_ERR, sizeof($errors) . " instance/s failed to handle the undo-like activity!");
}
}
/**
* Send a Create notification to remote instances
*
* @param Notice $notice
* @throws EmptyPkeyValueException
* @throws HTTP_Request2_Exception
* @throws InvalidUrlException
* @throws ServerException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function create_note($notice)
{
$data = Activitypub_create::create_to_array(
$this->actor_uri,
common_local_url('apNotice', ['id' => $notice->getID()]),
Activitypub_notice::notice_to_array($notice)
);
$data = json_encode($data, JSON_UNESCAPED_SLASHES);
foreach ($this->to_inbox() as $inbox) {
try {
$res = $this->send($data, $inbox);
// accummulate errors for later use, if needed
if (!($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409)) {
$res_body = json_decode($res->getBody(), true);
$errors[] = isset($res_body['error']) ?
$res_body['error'] : "An unknown error occurred.";
$to_failed[$inbox] = $notice;
}
} catch (Exception $e) {
$to_failed[$inbox] = $notice;
}
}
if (!empty($errors)) {
common_log(LOG_ERR, sizeof($errors) . " instance/s failed to handle the create-note activity!");
}
}
/**
* Send a Create direct-notification to remote instances
*
* @param Notice $message
* @author Bruno Casteleiro <brunoccast@fc.up.pt>
*/
public function create_direct_note(Notice $message)
{
$data = Activitypub_create::create_to_array(
$this->actor_uri,
common_local_url('apNotice', ['id' => $message->getID()]),
Activitypub_message::message_to_array($message),
true
);
$data = json_encode($data, JSON_UNESCAPED_SLASHES);
foreach ($this->to_inbox(false) as $inbox) {
$res = $this->send($data, $inbox);
// accummulate errors for later use, if needed
if (!($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409)) {
$res_body = json_decode($res->getBody(), true);
$errors[] = isset($res_body['error']) ?
$res_body['error'] : "An unknown error occurred.";
$to_failed[$inbox] = $message;
}
}
if (!empty($errors)) {
common_log(LOG_ERR, sizeof($errors) . " instance/s failed to handle the create-note activity!");
}
}
/**
* Send a Announce notification to remote instances
*
* @param Notice $notice
* @param Notice $repeat_of
* @throws HTTP_Request2_Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function announce(Notice $notice, Notice $repeat_of): void
{
$data = json_encode(
Activitypub_announce::announce_to_array($this->actor, $notice, $repeat_of),
JSON_UNESCAPED_SLASHES
);
foreach ($this->to_inbox() as $inbox) {
try {
$res = $this->send($data, $inbox);
// accummulate errors for later use, if needed
if (!($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409)) {
$res_body = json_decode($res->getBody(), true);
$errors[] = isset($res_body['error']) ?
$res_body['error'] : "An unknown error occurred.";
$to_failed[$inbox] = $notice;
}
} catch (Exception $e) {
$to_failed[$inbox] = $notice;
}
}
if (!empty($errors)) {
common_log(LOG_ERR, sizeof($errors) . " instance/s failed to handle the announce activity!");
}
}
/**
* Send a Delete notification to remote instances holding the notice
*
* @param Notice $notice
* @throws HTTP_Request2_Exception
* @throws InvalidUrlException
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function delete_note($notice)
{
$data = Activitypub_delete::delete_to_array($notice);
$errors = [];
$data = json_encode($data, JSON_UNESCAPED_SLASHES);
foreach ($this->to_inbox() as $inbox) {
try {
$res = $this->send($data, $inbox);
if (!($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409)) {
$res_body = json_decode($res->getBody(), true);
$errors[] = isset($res_body['error']) ?
$res_body['error'] : "An unknown error occurred.";
$to_failed[$inbox] = $notice;
}
} catch (Exception $e) {
$to_failed[$inbox] = $notice;
}
}
if (!empty($errors)) {
throw new Exception(json_encode($errors));
}
}
/**
* Send a Delete notification to remote followers of some deleted profile
*
* @param Profile $deleted_profile
* @throws HTTP_Request2_Exception
* @author Bruno Casteleiro <brunoccast@fc.up.pt>
*/
public function delete_profile(Profile $deleted_profile)
{
$data = Activitypub_delete::delete_to_array($deleted_profile);
$data = json_encode($data, JSON_UNESCAPED_SLASHES);
$errors = [];
foreach ($this->to_inbox() as $inbox) {
try {
$res = $this->send($data, $inbox);
// accumulate errors for later use, if needed
if (!($res->getStatus() == 200 || $res->getStatus() == 202 || $res->getStatus() == 409)) {
$res_body = json_decode($res->getBody(), true);
$errors[] = isset($res_body['error']) ?
$res_body['error'] : "An unknown error occurred.";
}
} catch (Exception $e) {
$to_failed[$inbox] = $notice;
}
}
if (!empty($errors)) {
common_log(LOG_ERR, sizeof($errors) . " instance/s failed to handle the delete_profile activity!");
}
}
/**
* Clean list of inboxes to deliver messages
*
* @param bool $actorFollowers whether to include the actor's follower collection
* @return array To Inbox URLs
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function to_inbox(bool $actorFollowers = true): array
{
if ($actorFollowers) {
$discovery = new Activitypub_explorer();
$followers = apActorFollowersAction::generate_followers($this->actor, 0, null);
foreach ($followers as $sub) {
try {
$this->to[]= Activitypub_profile::from_profile($discovery->lookup($sub)[0]);
} catch (Exception $e) {
// Not an ActivityPub Remote Follower, let it go
}
}
unset($discovery);
}
$to_inboxes = [];
foreach ($this->to as $to_profile) {
$i = $to_profile->get_inbox();
// Prevent delivering to self
if ($i == common_local_url('apInbox')) {
continue;
}
$to_inboxes[] = $i;
}
return array_unique($to_inboxes);
}
}