gnu-social/plugins/ActivityPub/lib/inbox_handler.php
Diogo Cordeiro 2f1ddd8280 [CORE] Add ActivityPub plugin
This is not the same as the one in https://notabug.org/diogo/gnu-social-activitypub-plugin
Differences to the first "release"
-> Doesn't use guzzle nor has any composer dependencies
-> Supports HTTP Signatures
-> Has basic l10n/i18n
-> Some minor bug fixes
2021-07-16 19:44:33 +01:00

325 lines
10 KiB
PHP

<?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 Inbox 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 Activitypub_inbox_handler
{
private $activity;
private $actor;
private $object;
/**
* Create a Inbox Handler to receive something from someone.
*
* @param array $activity Activity we are receiving
* @param Profile $actor_profile Actor originating the activity
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function __construct($activity, $actor_profile = null)
{
$this->activity = $activity;
$this->object = $activity['object'];
// Validate Activity
$this->validate_activity();
// Get Actor's Profile
if (!is_null($actor_profile)) {
$this->actor = $actor_profile;
} else {
$this->actor = ActivityPub_explorer::get_profile_from_url($this->activity['actor']);
}
// Handle the Activity
$this->process();
}
/**
* Validates if a given Activity is valid. Throws exception if not.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @throws Exception
*/
private function validate_activity()
{
// Activity validation
// Validate data
if (!(isset($this->activity['type']))) {
throw new Exception('Activity Validation Failed: Type was not specified.');
}
if (!isset($this->activity['actor'])) {
throw new Exception('Activity Validation Failed: Actor was not specified.');
}
if (!isset($this->activity['object'])) {
throw new Exception('Activity Validation Failed: Object was not specified.');
}
// Object validation
switch ($this->activity['type']) {
case 'Accept':
Activitypub_accept::validate_object($this->object);
break;
case 'Create':
Activitypub_create::validate_object($this->object);
break;
case 'Delete':
case 'Follow':
case 'Like':
case 'Announce':
if (!filter_var($this->object, FILTER_VALIDATE_URL)) {
throw new Exception('Object is not a valid Object URI for Activity.');
}
break;
case 'Undo':
Activitypub_undo::validate_object($this->object);
break;
default:
throw new Exception('Unknown Activity Type.');
}
}
/**
* Sends the Activity to proper handler in order to be processed.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function process()
{
switch ($this->activity['type']) {
case 'Accept':
$this->handle_accept($this->actor, $this->object);
break;
case 'Create':
$this->handle_create($this->actor, $this->object);
break;
case 'Delete':
$this->handle_delete($this->actor, $this->object);
break;
case 'Follow':
$this->handle_follow($this->actor, $this->object);
break;
case 'Like':
$this->handle_like($this->actor, $this->object);
break;
case 'Undo':
$this->handle_undo($this->actor, $this->object);
break;
case 'Announce':
$this->handle_announce($this->actor, $this->object);
break;
}
}
/**
* Handles an Accept Activity received by our inbox.
*
* @param Profile $actor Actor
* @param array $object Activity
* @throws HTTP_Request2_Exception
* @throws NoProfileException
* @throws ServerException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function handle_accept($actor, $object)
{
switch ($object['type']) {
case 'Follow':
$this->handle_accept_follow($actor, $object);
break;
}
}
/**
* Handles an Accept Follow Activity received by our inbox.
*
* @param Profile $actor Actor
* @param array $object Activity
* @throws HTTP_Request2_Exception
* @throws NoProfileException
* @throws ServerException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function handle_accept_follow($actor, $object)
{
// Get valid Object profile
$object_profile = new Activitypub_explorer;
$object_profile = $object_profile->lookup($object['object'])[0];
$pending_list = new Activitypub_pending_follow_requests($actor->getID(), $object_profile->getID());
$pending_list->remove();
}
/**
* Handles a Create Activity received by our inbox.
*
* @param Profile $actor Actor
* @param array $object Activity
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function handle_create($actor, $object)
{
switch ($object['type']) {
case 'Note':
Activitypub_notice::create_notice($object, $actor);
break;
}
}
/**
* Handles a Delete Activity received by our inbox.
*
* @param Profile $actor Actor
* @param array $object Activity
* @throws AuthorizationException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function handle_delete($actor, $object)
{
$notice = ActivityPubPlugin::grab_notice_from_url($object['object']);
$notice->deleteAs($actor);
}
/**
* Handles a Follow Activity received by our inbox.
*
* @param Profile $actor Actor
* @param array $object Activity
* @throws AlreadyFulfilledException
* @throws HTTP_Request2_Exception
* @throws NoProfileException
* @throws ServerException
* @throws \GuzzleHttp\Exception\GuzzleException
* @throws \HttpSignatures\Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function handle_follow($actor, $object)
{
Activitypub_follow::follow($actor, $object);
}
/**
* Handles a Like Activity received by our inbox.
*
* @param Profile $actor Actor
* @param array $object Activity
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function handle_like($actor, $object)
{
$notice = ActivityPubPlugin::grab_notice_from_url($object);
Fave::addNew($actor, $notice);
}
/**
* Handles a Undo Activity received by our inbox.
*
* @param Profile $actor Actor
* @param array $object Activity
* @throws AlreadyFulfilledException
* @throws HTTP_Request2_Exception
* @throws NoProfileException
* @throws ServerException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function handle_undo($actor, $object)
{
switch ($object['type']) {
case 'Follow':
$this->handle_undo_follow($actor, $object['object']);
break;
case 'Like':
$this->handle_undo_like($actor, $object['object']);
break;
}
}
/**
* Handles a Undo Like Activity received by our inbox.
*
* @param Profile $actor Actor
* @param array $object Activity
* @throws AlreadyFulfilledException
* @throws ServerException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
private function handle_undo_like($actor, $object)
{
$notice = ActivityPubPlugin::grab_notice_from_url($object);
Fave::removeEntry($actor, $notice);
}
/**
* Handles a Undo Follow Activity received by our inbox.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $actor Actor
* @param array $object Activity
* @throws AlreadyFulfilledException
* @throws HTTP_Request2_Exception
* @throws NoProfileException
* @throws ServerException
*/
private function handle_undo_follow($actor, $object)
{
// Get Object profile
$object_profile = new Activitypub_explorer;
$object_profile = $object_profile->lookup($object)[0];
if (Subscription::exists($actor, $object_profile)) {
Subscription::cancel($actor, $object_profile);
// You are no longer following this person.
} else {
// 409: You are not following this person already.
}
}
/**
* Handles a Announce Activity received by our inbox.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $actor Actor
* @param array $object Activity
* @throws Exception
*/
private function handle_announce($actor, $object)
{
$object_notice = ActivityPubPlugin::grab_notice_from_url($object);
$object_notice->repeat($actor, 'ActivityPub');
}
}