410 lines
14 KiB
PHP
410 lines
14 KiB
PHP
<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social 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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// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
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* ActivityPub implementation for GNU social
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*
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* @package GNUsocial
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @copyright 2018-2019 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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* @link http://www.gnu.org/software/social/
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*/
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defined('GNUSOCIAL') || die();
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/**
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* ActivityPub Inbox Handler
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*
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* @category Plugin
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* @package GNUsocial
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class Activitypub_inbox_handler
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{
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private $activity;
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private $actor;
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private $object;
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/**
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* Create a Inbox Handler to receive something from someone.
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*
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* @param array $activity Activity we are receiving
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* @param Profile $actor_profile Actor originating the activity
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public function __construct($activity, $actor_profile = null)
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{
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$this->activity = $activity;
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$this->object = $activity['object'];
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// Validate Activity
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if (!$this->validate_activity()) {
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return; // Just ignore
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}
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// Get Actor's Profile
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if (!is_null($actor_profile)) {
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$this->actor = $actor_profile;
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} else {
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$this->actor = ActivityPub_explorer::get_profile_from_url($this->activity['actor']);
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}
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// Handle the Activity
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$this->process();
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}
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/**
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* Validates if a given Activity is valid. Throws exception if not.
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*
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* @throws Exception if invalid
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* @return bool true if valid and acceptable, false if unsupported
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function validate_activity(): bool
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{
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// Activity validation
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// Validate data
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if (!(isset($this->activity['type']))) {
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throw new Exception('Activity Validation Failed: Type was not specified.');
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}
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if (!isset($this->activity['actor'])) {
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throw new Exception('Activity Validation Failed: Actor was not specified.');
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}
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if (!isset($this->activity['object'])) {
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throw new Exception('Activity Validation Failed: Object was not specified.');
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}
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// Object validation
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$valid = true;
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switch ($this->activity['type']) {
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case 'Accept':
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$valid = Activitypub_accept::validate_object($this->object);
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break;
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case 'Create':
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$valid = Activitypub_create::validate_object($this->object);
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break;
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case 'Delete':
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$valid = Activitypub_delete::validate_object($this->object);
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break;
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case 'Follow':
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case 'Like':
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case 'Announce':
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if (!filter_var($this->object, FILTER_VALIDATE_URL)) {
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throw new Exception('Object is not a valid Object URI for Activity.');
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}
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break;
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case 'Undo':
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$valid = Activitypub_undo::validate_object($this->object);
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break;
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default:
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throw new Exception('Unknown Activity Type.');
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}
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return $valid;
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}
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/**
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* Sends the Activity to proper handler in order to be processed.
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*
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* @throws AlreadyFulfilledException
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws ServerException
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function process()
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{
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switch ($this->activity['type']) {
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case 'Accept':
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$this->handle_accept();
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break;
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case 'Create':
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$this->handle_create();
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break;
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case 'Delete':
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$this->handle_delete();
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break;
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case 'Follow':
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$this->handle_follow();
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break;
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case 'Like':
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$this->handle_like();
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break;
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case 'Undo':
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$this->handle_undo();
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break;
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case 'Announce':
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$this->handle_announce();
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break;
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}
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}
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/**
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* Handles an Accept Activity received by our inbox.
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*
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws ServerException
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_accept()
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{
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switch ($this->object['type']) {
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case 'Follow':
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$this->handle_accept_follow();
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break;
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}
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}
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/**
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* Handles an Accept Follow Activity received by our inbox.
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*
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws ServerException
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_accept_follow()
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{
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// Get valid Object profile
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// Note that, since this an accept_follow, the $object
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// profile is actually the actor that followed someone
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$object_profile = new Activitypub_explorer;
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$object_profile = $object_profile->lookup($this->object['object'])[0];
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Activitypub_profile::subscribeCacheUpdate($object_profile, $this->actor);
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$pending_list = new Activitypub_pending_follow_requests($object_profile->getID(), $this->actor->getID());
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$pending_list->remove();
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}
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/**
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* Handles a Create Activity received by our inbox.
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*
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_create()
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{
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switch ($this->object['type']) {
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case 'Note':
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$this->handle_create_note();
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break;
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}
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}
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/**
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* Handle a Create Note Activity received by our inbox.
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*
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* @throws Exception
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* @author Bruno Casteleiro <brunoccast@fc.up.pt>
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*/
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private function handle_create_note()
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{
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if (Activitypub_create::isPrivateNote($this->activity)) {
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Activitypub_message::create_message($this->object, $this->actor);
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} else {
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Activitypub_notice::create_notice($this->object, $this->actor);
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}
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}
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/**
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* Handles a Delete Activity received by our inbox.
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*
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* @author Bruno Casteleiro <brunoccast@fc.up.pt>
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_delete()
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{
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$object = $this->object;
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if (is_string($object)) {
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$client = new HTTPClient();
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$response = $client->get($object, ACTIVITYPUB_HTTP_CLIENT_HEADERS);
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$not_gone = $response->isOk();
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if ($not_gone) { // It's not gone, we're updating it.
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$object = json_decode($response->getBody(), true);
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switch ($object['type']) {
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case 'Person':
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try {
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// Update profile if we already have a copy of it
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$aprofile = Activitypub_profile::fromUri($object['id'], false);
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Activitypub_profile::update_profile($aprofile, $object);
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} catch (Exception $e) {
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// Import profile if we don't
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Activitypub_explorer::get_profile_from_url($object['id']);
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}
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break;
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case 'Note': // XXX: We do not support updating a note's contents so, we'll delete and re-fetch for now...
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try {
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$notice = ActivityPubPlugin::grab_notice_from_url($object['id'], false);
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if ($notice instanceof Notice) {
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$notice->delete();
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}
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ActivityPubPlugin::grab_notice_from_url($object['id'], true);
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return;
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} catch (Exception $e) {
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// either already deleted or not an object at all
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// nothing to do..
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}
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break;
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default:
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common_log(LOG_INFO, "Ignoring Delete activity, we do not understand for {$object['type']}.");
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}
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}
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}
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// IFF we reached this point, it either is gone or it's an array
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// If it's gone, we don't know the type of the deleted object, we only have a Tombstone
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// If we were given an array, we don't know if it's Gone or not via status code...
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// In both cases, we will want to fetch the ID and act on that as it is easier than updating the fields
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$object = $object['id'] ?? null;
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if (is_null($object)) {
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return;
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}
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// Was it a profile?
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try {
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$aprofile = Activitypub_profile::fromUri($object, false);
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$res = Activitypub_explorer::get_remote_user_activity($object);
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Activitypub_profile::update_profile($aprofile, $res);
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return;
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} catch (Exception $e) {
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// Means this wasn't a profile
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}
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// Was it a note?
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try {
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$client = new HTTPClient();
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/*$response =*/ $client->get($object, ACTIVITYPUB_HTTP_CLIENT_HEADERS);
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// If it were deleted
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//if (!$response->isOk()) { // 410 or 404
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$notice = ActivityPubPlugin::grab_notice_from_url($object, false);
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if ($notice instanceof Notice) {
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$notice->delete();
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}
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// } else
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ActivityPubPlugin::grab_notice_from_url($object, true);
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// XXX: We do not support updating a note's contents so, we'll delete and re-fetch for now...
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} catch (Exception $e) {
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// Means we didn't have this note already
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// Or we had, deleted and it exploded trying to fetch the Tombstone, either way, we're good.
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}
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}
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/**
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* Handles a Follow Activity received by our inbox.
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*
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* @throws AlreadyFulfilledException
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws ServerException
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_follow()
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{
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Activitypub_follow::follow($this->actor, $this->object, $this->activity['id']);
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}
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/**
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* Handles a Like Activity received by our inbox.
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*
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_like()
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{
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$notice = ActivityPubPlugin::grab_notice_from_url($this->object);
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Activitypub_like::addNew($this->activity['id'], $this->actor, $notice);
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}
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/**
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* Handles a Undo Activity received by our inbox.
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*
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* @throws AlreadyFulfilledException
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws ServerException
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_undo()
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{
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switch ($this->object['type']) {
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case 'Follow':
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$this->handle_undo_follow();
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break;
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case 'Like':
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$this->handle_undo_like();
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break;
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}
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}
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/**
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* Handles a Undo Follow Activity received by our inbox.
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*
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* @throws AlreadyFulfilledException
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws ServerException
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_undo_follow()
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{
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// Get Object profile
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$object_profile = new Activitypub_explorer;
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$object_profile = $object_profile->lookup($this->object['object'])[0];
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if (Subscription::exists($this->actor, $object_profile)) {
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Subscription::cancel($this->actor, $object_profile);
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// You are no longer following this person.
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Activitypub_profile::unsubscribeCacheUpdate($this->actor, $object_profile);
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} /*else {
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// 409: You already aren't following this person.
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}*/
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}
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/**
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* Handles a Undo Like Activity received by our inbox.
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*
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* @throws AlreadyFulfilledException
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* @throws ServerException
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_undo_like()
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{
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$notice = ActivityPubPlugin::grab_notice_from_url($this->activity['id']);
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Fave::removeEntry($this->actor, $notice);
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}
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/**
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* Handles a Announce Activity received by our inbox.
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*
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function handle_announce()
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{
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$notice = ActivityPubPlugin::grab_notice_from_url($this->object);
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Activitypub_announce::repeat($this->activity['id'], $this->actor, $notice);
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}
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}
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