GNUsocial/gnu-social-v2-archive-activitypub-plugin
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Add Discovery module

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See merge request dansup/ActivityPub!4
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Diogo Cordeiro
2018-07-09 23:19:07 +00:00
parent fc5b344864 cb70a8f6e8
commit 08ec02561a
1 changed files with 180 additions and 0 deletions
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utils/discovery.php Normal file
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<?php
use Profile;
/**
* GNU social - a federating social network
*
* ActivityPubPlugin implementation for GNU Social
*
* LICENCE: This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Plugin
* @package GNUsocial
* @author Daniel Supernault <danielsupernault@gmail.com>
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @copyright 2018 Free Software Foundation http://fsf.org
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link https://www.gnu.org/software/social/
*/
if (!defined ('GNUSOCIAL')) {
exit(1);
}
/**
* @category Plugin
* @package GNUsocial
* @author Daniel Supernault <danielsupernault@gmail.com>
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://www.gnu.org/software/social/
*/
class Activitypub_Discovery
{
private $discovered_actor_profiles = array ();
/**
* Get every profile from the given URL
* This function cleans the $this->discovered_actor_profiles array
* so that there is no erroneous data
*
* @param string $url User's url
* @return array of \Profile objects
*/
public function lookup ($url)
{
$this->discovered_actor_profiles = array ();
return $this->_lookup ($url);
}
/**
* Get every profile from the given URL
* This is a recursive function that will accumulate the results on
* $discovered_actor_profiles array
*
* @param string $url User's url
* @return array of \Profile objects
*/
private function _lookup ($url)
{
// First check if we already have it locally and, if so, return it
// If the local fetch fails: grab it remotely, store locally and return
$this->grab_local_user ($url) || $this->grab_remote_user($url);
return $this->discovered_actor_profiles;
}
/**
* Get a local user profiles from its URL and joins it on
* $this->discovered_actor_profiles
*
* @param string $url User's url
* @return boolean success state
*/
private function grab_local_user ($url)
{
if (($actor_profile = Profile::getKV ("profileurl", $url)) != false) {
$this->discovered_actor_profiles[]= $actor_profile;
return true;
} else {
/******************************** XXX: ********************************
* Sometimes it is not true that the user is not locally available, *
* mostly when it is a local user and URLs slightly changed *
* e.g.: GS instance owner changed from standard urls to pretty urls *
* (not sure if this is necessary, but anyway) *
**********************************************************************/
// Iff we really are in the same instance
$root_url_len = strlen (common_root_url ());
if (substr ($url, 0, $root_url_len) == common_root_url ()) {
// Grab the nickname and try to get the user
if (($actor_profile = Profile::getKV ("nickname", substr ($url, $root_url_len))) != false) {
$this->discovered_actor_profiles[]= $actor_profile;
return true;
}
}
}
return false;
}
/**
* Get a remote user(s) profile(s) from its URL and joins it on
* $this->discovered_actor_profiles
*
* @param string $url User's url
* @return boolean success state
*/
private function grab_remote_user ($url) {
$client = new HTTPClient ();
$headers = array();
$headers[] = 'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
$headers[] = 'User-Agent: GNUSocialBot v0.1 - https://gnu.io/social';
$response = $client->get ($url, $headers);
if (!$response->isOk()) {
throw new NoResultException ("Invalid Actor URL.");
}
$res = json_decode ($response->getBody (), JSON_UNESCAPED_SLASHES);
if (isset ($res["orderedItems"])) { // It's a potential collection of actors!!!
foreach ($res["orderedItems"] as $profile) {
if ($this->_lookup ($profile) == false) {
// XXX: Invalid actor found, not sure how we handle those
}
}
// Go through entire collection
if (!is_null ($res["next"])) {
$this->_lookup ($res["next"]);
}
return true;
} else if ($this->validate_remote_response ($res)) {
$this->discovered_actor_profiles[]= $this->store_profile ($res);
return true;
}
return false;
}
/**
* Save remote user profile in local instance
*
* @param array $res remote response
* @return \Profile remote Profile object
*/
private function store_profile ($res) {
$profile = new Profile;
$profile->profileurl = $res["url"];
$profile->nickname = $res["nickname"];
$profile->fullname = $res["display_name"];
$profile->bio = substr ($res["summary"], 0, 1000);
$profile->insert ();
return $profile;
}
/**
* Validates a remote response in order to determine whether this
* response is a valid profile or not
*
* @param array $res remote response
* @return boolean success state
*/
private function validate_remote_response ($res) {
if (!isset ($res["url"], $res["nickname"], $res["display_name"], $res["summary"])) {
return false;
}
return true;
}
}