265 lines
9.1 KiB
PHP
Executable File
265 lines
9.1 KiB
PHP
Executable File
<?php
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/**
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* GNU social - a federating social network
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*
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* ActivityPubPlugin implementation for GNU Social
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*
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* LICENCE: This program 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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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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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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* @author Daniel Supernault <danielsupernault@gmail.com>
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* @copyright 2018 Free Software Foundation http://fsf.org
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link https://www.gnu.org/software/social/
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*/
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if (!defined('GNUSOCIAL')) {
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exit(1);
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}
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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) ActivityPub profiles
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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 http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://www.gnu.org/software/social/
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*/
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class Activitypub_explorer
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{
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private $discovered_actor_profiles = array();
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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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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @param string $url User's url
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* @return array of Profile objects
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*/
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public function lookup($url)
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{
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$this->discovered_actor_profiles = array();
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return $this->_lookup($url);
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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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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @param string $url User's url
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* @return array of Profile objects
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*/
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private function _lookup($url)
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{
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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: grab it remotely, store locally and return
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if (! ($this->grab_local_user($url) || $this->grab_remote_user($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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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @param string $url
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* @return boolean success state (related to the response)
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* @throws Exception (If the HTTP request fails)
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*/
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private function ensure_proper_remote_uri($url)
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{
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$client = new HTTPClient();
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$headers = [];
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$headers[] = 'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
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$headers[] = 'User-Agent: GNUSocialBot v0.1 - https://gnu.io/social';
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$response = $client->get($url, $headers);
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if (!$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(), JSON_UNESCAPED_SLASHES);
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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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}
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return false;
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}
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/**
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* Get a local user profiles from its URL and joins it on
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* $this->discovered_actor_profiles
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*
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @param string $uri Actor's uri
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* @return boolean success state
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*/
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private function grab_local_user($uri, $online = false)
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{
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// Ensure proper remote URI
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// If an exception occurs here it's better to just leave everything
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// break than to continue processing
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if ($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 = Activitypub_profile::getKV("uri", $uri);
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if ($aprofile instanceof Activitypub_profile) {
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$profile = $aprofile->local_profile();
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// We found something!
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$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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}
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// If offline grabbing failed, attempt again with online resources
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if (!$online) {
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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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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @param string $url User's url
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* @return boolean success state
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*/
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private function grab_remote_user($url)
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{
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if (!isset($this->temp_res)) {
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$client = new HTTPClient();
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$headers = array();
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$headers[] = 'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
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$headers[] = 'User-Agent: GNUSocialBot v0.1 - https://gnu.io/social';
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$response = $client->get($url, $headers);
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if (!$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(), JSON_UNESCAPED_SLASHES);
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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($res["orderedItems"])) { // It's a potential collection of actors!!!
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foreach ($res["orderedItems"] as $profile) {
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if ($this->_lookup($profile) == false) {
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// XXX: Invalid actor found, not sure how we handle those
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}
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}
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// Go through entire collection
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if (!is_null($res["next"])) {
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$this->_lookup($res["next"]);
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}
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return true;
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} elseif (self::validate_remote_response($res)) {
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$this->discovered_actor_profiles[]= $this->store_profile($res);
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return true;
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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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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @param array $res remote response
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* @return Profile remote Profile object
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*/
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private function store_profile($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 = $res['name'];
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$aprofile->bio = substr($res['summary'], 0, 1000);
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$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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return $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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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @param array $res remote response
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* @return boolean success state
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*/
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private static function validate_remote_response($res)
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{
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if (!isset($res['id'], $res['preferredUsername'], $res['name'], $res['summary'], $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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* Given a valid actor profile url returns its inboxes
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*
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @param string $url of Actor profile
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* @return boolean|array false if fails | array with inbox and shared inbox if successful
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*/
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public static function get_actor_inboxes_uri($url)
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{
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$client = new HTTPClient();
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$headers = array();
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$headers[] = 'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
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$headers[] = 'User-Agent: GNUSocialBot v0.1 - https://gnu.io/social';
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$response = $client->get($url, $headers);
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if (!$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(), JSON_UNESCAPED_SLASHES);
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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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