481 lines
18 KiB
PHP
481 lines
18 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's own Explorer
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*
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* Allows to discovery new (or the same) Profiles (both local or remote)
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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_explorer
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{
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private $discovered_actor_profiles = [];
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private $temp_res; // global variable to hold a temporary http response
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private static $headers = ['Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
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'User-Agent: GNUsocialBot ' . GNUSOCIAL_VERSION . ' - https://gnusocial.network'];
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/**
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* Shortcut function to get a single profile from its URL.
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*
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* @param string $url
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* @param bool $grab_online whether to try online grabbing, defaults to true
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* @return Profile
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws Exception
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* @throws ServerException
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function get_profile_from_url($url, $grab_online = true)
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{
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$discovery = new Activitypub_explorer();
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// Get valid Actor object
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$actor_profile = $discovery->lookup($url, $grab_online);
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if (!empty($actor_profile)) {
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return $actor_profile[0];
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}
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throw new Exception('Invalid Actor.');
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}
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/**
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* Get every profile from the given URL
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* This function cleans the $this->discovered_actor_profiles array
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* so that there is no erroneous data
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*
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* @param string $url User's url
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* @param bool $grab_online whether to try online grabbing, defaults to true
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* @return array of Profile objects
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws Exception
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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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public function lookup(string $url, bool $grab_online = true)
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{
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if (in_array($url, ACTIVITYPUB_PUBLIC_TO)) {
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return [];
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}
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common_debug('ActivityPub Explorer: Started now looking for ' . $url);
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$this->discovered_actor_profiles = [];
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return $this->_lookup($url, $grab_online);
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}
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/**
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* Get every profile from the given URL
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* This is a recursive function that will accumulate the results on
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* $discovered_actor_profiles array
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*
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* @param string $url User's url
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* @param bool $grab_online whether to try online grabbing, defaults to true
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* @return array of Profile objects
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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 _lookup(string $url, bool $grab_online = true)
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{
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$grab_local = $this->grab_local_user($url);
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// First check if we already have it locally and, if so, return it.
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// If the local fetch fails and remote grab is required: store locally and return.
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if (!$grab_local && (!$grab_online || !$this->grab_remote_user($url))) {
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throw new Exception('User not found.');
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}
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return $this->discovered_actor_profiles;
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}
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/**
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* This ensures that we are using a valid ActivityPub URI
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*
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* @param string $url
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* @return bool success state (related to the response)
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* @throws Exception (If the HTTP request fails)
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function ensure_proper_remote_uri($url)
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{
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$client = new HTTPClient();
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$response = $client->get($url, self::$headers);
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$res = json_decode($response->getBody(), true);
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if (self::validate_remote_response($res)) {
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$this->temp_res = $res;
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return true;
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} else {
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common_debug('ActivityPub Explorer: Invalid potential remote actor while ensuring URI: ' . $url . '. He returned the following: ' . json_encode($res, JSON_UNESCAPED_SLASHES));
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}
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return false;
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}
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/**
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* Get a local user profile from its URL and joins it on
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* $this->discovered_actor_profiles
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*
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* @param string $uri Actor's uri
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* @param bool $online
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* @return bool success state
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* @throws NoProfileException
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function grab_local_user($uri, $online = false)
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{
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if ($online) {
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common_debug('ActivityPub Explorer: Searching locally for ' . $uri . ' with online resources.');
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} else {
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common_debug('ActivityPub Explorer: Searching locally for ' . $uri . ' offline.');
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}
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// Ensure proper remote URI
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// If an exception occurs here it's better to just leave everything
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// break than to continue processing
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if ($online && $this->ensure_proper_remote_uri($uri)) {
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$uri = $this->temp_res["id"];
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}
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// Try standard ActivityPub route
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// Is this a known filthy little mudblood?
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$aprofile = self::get_aprofile_by_url($uri);
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if ($aprofile instanceof Activitypub_profile) {
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$profile = $aprofile->local_profile();
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common_debug('ActivityPub Explorer: Found a local Aprofile for ' . $uri);
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// We found something!
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$this->discovered_actor_profiles[] = $profile;
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unset($this->temp_res); // IMPORTANT to avoid _dangerous_ noise in the Explorer system
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return true;
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} else {
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common_debug('ActivityPub Explorer: Unable to find a local Aprofile for ' . $uri . ' - looking for a Profile instead.');
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// Well, maybe it is a pure blood?
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// Iff, we are in the same instance:
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$ACTIVITYPUB_BASE_ACTOR_URI_length = strlen(ACTIVITYPUB_BASE_ACTOR_URI);
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if (substr($uri, 0, $ACTIVITYPUB_BASE_ACTOR_URI_length) == ACTIVITYPUB_BASE_ACTOR_URI) {
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try {
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$profile = Profile::getByID(intval(substr($uri, $ACTIVITYPUB_BASE_ACTOR_URI_length)));
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common_debug('ActivityPub Explorer: Found a Profile for ' . $uri);
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// We found something!
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$this->discovered_actor_profiles[] = $profile;
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unset($this->temp_res); // IMPORTANT to avoid _dangerous_ noise in the Explorer system
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return true;
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} catch (Exception $e) {
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// Let the exception go on its merry way.
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common_debug('ActivityPub Explorer: Unable to find a Profile for ' . $uri);
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}
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}
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}
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// If offline grabbing failed, attempt again with online resources
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if (!$online) {
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common_debug('ActivityPub Explorer: Will try everything again with online resources against: ' . $uri);
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return $this->grab_local_user($uri, true);
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}
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return false;
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}
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/**
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* Get a remote user(s) profile(s) from its URL and joins it on
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* $this->discovered_actor_profiles
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*
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* @param string $url User's url
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* @return bool success state
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws ServerException
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function grab_remote_user($url)
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{
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common_debug('ActivityPub Explorer: Trying to grab a remote actor for ' . $url);
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if (!isset($this->temp_res)) {
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$client = new HTTPClient();
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$response = $client->get($url, self::$headers);
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$res = json_decode($response->getBody(), true);
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} else {
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$res = $this->temp_res;
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unset($this->temp_res);
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}
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if (isset($res['type']) && $res['type'] === 'OrderedCollection' && isset($res['first'])) { // It's a potential collection of actors!!!
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common_debug('ActivityPub Explorer: Found a collection of actors for ' . $url);
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$this->travel_collection($res['first']);
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return true;
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} elseif (self::validate_remote_response($res)) {
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common_debug('ActivityPub Explorer: Found a valid remote actor for ' . $url);
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$this->discovered_actor_profiles[] = $this->store_profile($res);
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return true;
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} else {
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common_debug('ActivityPub Explorer: Invalid potential remote actor while grabbing remotely: ' . $url . '. He returned the following: ' . json_encode($res, JSON_UNESCAPED_SLASHES));
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}
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return false;
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}
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/**
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* Save remote user profile in local instance
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*
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* @param array $res remote response
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* @return Profile remote Profile object
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* @throws NoProfileException
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* @throws ServerException
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function store_profile($res)
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{
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// ActivityPub Profile
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$aprofile = new Activitypub_profile;
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$aprofile->uri = $res['id'];
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$aprofile->nickname = $res['preferredUsername'];
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$aprofile->fullname = isset($res['name']) ? $res['name'] : null;
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$aprofile->bio = isset($res['summary']) ? substr(strip_tags($res['summary']), 0, 1000) : null;
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$aprofile->inboxuri = $res['inbox'];
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$aprofile->sharedInboxuri = isset($res['endpoints']['sharedInbox']) ? $res['endpoints']['sharedInbox'] : $res['inbox'];
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$aprofile->do_insert();
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$profile = $aprofile->local_profile();
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// Public Key
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$apRSA = new Activitypub_rsa();
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$apRSA->profile_id = $profile->getID();
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$apRSA->public_key = $res['publicKey']['publicKeyPem'];
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$apRSA->store_keys();
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// Avatar
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if (isset($res['icon']['url'])) {
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try {
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$this->update_avatar($profile, $res['icon']['url']);
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} catch (Exception $e) {
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// Let the exception go, it isn't a serious issue
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common_debug('ActivityPub Explorer: An error ocurred while grabbing remote avatar: ' . $e->getMessage());
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}
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}
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return $profile;
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}
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/**
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* Download and update given avatar image
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*
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* @param Profile $profile
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* @param string $url
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* @return Avatar The Avatar we have on disk.
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* @throws Exception in various failure cases
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* @author GNU social
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*/
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public static function update_avatar(Profile $profile, $url)
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{
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common_debug('ActivityPub Explorer: Started grabbing remote avatar from: ' . $url);
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if (!filter_var($url, FILTER_VALIDATE_URL)) {
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// TRANS: Server exception. %s is a URL.
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common_debug('ActivityPub Explorer: Failed because it is an invalid url: ' . $url);
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throw new ServerException(sprintf('Invalid avatar URL %s.', $url));
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}
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// @todo FIXME: This should be better encapsulated
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// ripped from oauthstore.php (for old OMB client)
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$temp_filename = tempnam(sys_get_temp_dir(), 'listener_avatar');
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try {
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$imgData = HTTPClient::quickGet($url);
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// Make sure it's at least an image file. ImageFile can do the rest.
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if (false === getimagesizefromstring($imgData)) {
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common_debug('ActivityPub Explorer: Failed because the downloaded avatar: ' . $url . 'is not a valid image.');
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throw new UnsupportedMediaException('Downloaded avatar was not an image.');
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}
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file_put_contents($temp_filename, $imgData);
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unset($imgData); // No need to carry this in memory.
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common_debug('ActivityPub Explorer: Stored dowloaded avatar in: ' . $temp_filename);
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$id = $profile->getID();
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$imagefile = new ImageFile(null, $temp_filename);
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$filename = Avatar::filename(
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$id,
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image_type_to_extension($imagefile->type),
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null,
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common_timestamp()
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);
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rename($temp_filename, Avatar::path($filename));
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common_debug('ActivityPub Explorer: Moved avatar from: ' . $temp_filename . ' to ' . $filename);
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} catch (Exception $e) {
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common_debug('ActivityPub Explorer: Something went wrong while processing the avatar from: ' . $url . ' details: ' . $e->getMessage());
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unlink($temp_filename);
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throw $e;
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}
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// @todo FIXME: Hardcoded chmod is lame, but seems to be necessary to
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// keep from accidentally saving images from command-line (queues)
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// that can't be read from web server, which causes hard-to-notice
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// problems later on:
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//
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// http://status.net/open-source/issues/2663
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chmod(Avatar::path($filename), 0644);
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$profile->setOriginal($filename);
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$orig = clone($profile);
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$profile->avatar = $url;
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$profile->update($orig);
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common_debug('ActivityPub Explorer: Seted Avatar from: ' . $url . ' to profile.');
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return Avatar::getUploaded($profile);
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}
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/**
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* Validates a remote response in order to determine whether this
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* response is a valid profile or not
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*
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* @param array $res remote response
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* @return bool success state
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function validate_remote_response($res)
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{
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if (!isset($res['id'], $res['preferredUsername'], $res['inbox'], $res['publicKey']['publicKeyPem'])) {
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return false;
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}
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return true;
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}
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/**
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* Get a ActivityPub Profile from it's uri
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* Unfortunately GNU social cache is not truly reliable when handling
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* potential ActivityPub remote profiles, as so it is important to use
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* this hacky workaround (at least for now)
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*
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* @param string $v URL
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* @return bool|Activitypub_profile false if fails | Aprofile object if successful
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function get_aprofile_by_url($v)
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{
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$i = Managed_DataObject::getcached("Activitypub_profile", "uri", $v);
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if (empty($i)) { // false = cache miss
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$i = new Activitypub_profile;
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$result = $i->get("uri", $v);
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if ($result) {
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// Hit!
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$i->encache();
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} else {
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return false;
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}
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}
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return $i;
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}
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/**
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* Given a valid actor profile url returns its inboxes
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*
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* @param string $url of Actor profile
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* @return bool|array false if fails | array with inbox and shared inbox if successful
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* @throws HTTP_Request2_Exception
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function get_actor_inboxes_uri($url)
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{
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$client = new HTTPClient();
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$response = $client->get($url, self::$headers);
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if (!$response->isOk()) {
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throw new Exception('Invalid Actor URL.');
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}
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$res = json_decode($response->getBody(), true);
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if (self::validate_remote_response($res)) {
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return [
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'inbox' => $res['inbox'],
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'sharedInbox' => isset($res['endpoints']['sharedInbox']) ? $res['endpoints']['sharedInbox'] : $res['inbox']
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];
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}
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return false;
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}
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/**
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* Allows the Explorer to transverse a collection of persons.
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*
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* @param string $url
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* @return bool
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* @throws HTTP_Request2_Exception
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* @throws NoProfileException
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* @throws ServerException
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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private function travel_collection($url)
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{
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$client = new HTTPClient();
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$response = $client->get($url, self::$headers);
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$res = json_decode($response->getBody(), true);
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if (!isset($res['orderedItems'])) {
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return false;
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}
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foreach ($res["orderedItems"] as $profile) {
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if ($this->_lookup($profile) == false) {
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common_debug('ActivityPub Explorer: Found an invalid actor for ' . $profile);
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// TODO: Invalid actor found, fallback to OStatus
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}
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}
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// Go through entire collection
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if (!is_null($res["next"])) {
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$this->_lookup($res["next"]);
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}
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return true;
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}
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/**
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* Get a remote user array from its URL (this function is only used for
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* profile updating and shall not be used for anything else)
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*
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* @param string $url User's url
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* @return mixed
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function get_remote_user_activity($url)
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{
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$client = new HTTPClient();
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$response = $client->get($url, self::$headers);
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$res = json_decode($response->getBody(), true);
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if (Activitypub_explorer::validate_remote_response($res)) {
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common_debug('ActivityPub Explorer: Found a valid remote actor for ' . $url);
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return $res;
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}
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throw new Exception('ActivityPub Explorer: Failed to get activity.');
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}
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}
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