gnu-social/modules/TheFreeNetwork/TheFreeNetworkModule.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
/**
* TheFreeNetwork, "automagic" migration of internal remote profiles
* between different federation protocols.
*
* @package GNUsocial
* @author Bruno Casteleiro <brunoccast@fc.up.pt>
* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
defined('GNUSOCIAL') || die();
/**
* Class TheFreeNetworkModule
* This module ensures that multiple protocols serving the same purpose won't result in duplicated data.
* This class is not to be extended but a developer implementing a new protocol should be aware of it and notify the
* StartTFNCensus event.
*
* @category Module
* @package GNUsocial
* @author Bruno Casteleiro <brunoccast@fc.up.pt>
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class TheFreeNetworkModule extends Module
{
const MODULE_VERSION = '0.1.0alpha0';
public $protocols = null; // protocols TFN should handle
public $priority = []; // protocols preferences
private $lrdd = false; // whether LRDD plugin is active or not
/**
* Initialize TFN
*
* @return bool hook value
*/
public function onInitializePlugin(): bool
{
// some protocol plugins can be unactivated,
// require needed classes
$plugin_dir = dirname(__DIR__, 2) . DIRECTORY_SEPARATOR . 'plugins';
$p = 0;
foreach ($this->protocols as $protocol => $class) {
$this->priority[$class] = $p++;
require_once $plugin_dir . DIRECTORY_SEPARATOR . $protocol . DIRECTORY_SEPARATOR . 'classes' . DIRECTORY_SEPARATOR . $class . '.php';
}
unset($p);
// $lrdd flag
$this->lrdd = PluginList::isPluginActive("LRDD");
return true;
}
/**
* A new remote profile is being added, check if we
* already have someone with the same URI.
*
* @param string $uri
* @param string $class profile class that triggered this event
* @param int|null &$profile_id Profile:id associated with the remote entity found
* @return bool hook flag false
* @throws AlreadyHandledException Do not allow to create a profile if a preferred protocol already has one
*/
public function onStartTFNLookup(string $uri, string $class, int &$profile_id = null): bool
{
[$profile_id, $cls] = $this->lookup($uri, $class) ?? [null, null];
if (is_null($profile_id)) {
$perf = common_config('performance', 'high');
if (!$perf && $this->lrdd) {
// Force lookup with online resources
[$profile_id, $cls] = $this->lookup($uri, $class, true);
}
}
// $cls being lower then $class means it has a higher priority (comes first) @see $this->onInitializePlugin()
if (!is_null($profile_id) && $this->priority[$cls] < $this->priority[$class]) {
throw new AlreadyHandledException("TheFreeNetworkModule->AlreadyHandled: $cls is preferred over $class");
}
return false;
}
/**
* A new remote profile was successfully added, delete
* other remotes associated with the same Profile entity.
*
* @param string $class profile class that triggered this event
* @param int $profile_id Profile:id associated with the new remote profile
* @return bool hook flag
*/
public function onEndTFNLookup(string $class, int $profile_id): bool
{
foreach ($this->protocols as $p => $cls) {
if ($cls != $class) {
$profile = $cls::getKV('profile_id', $profile_id);
if ($profile instanceof $cls) {
$this->log(LOG_INFO, 'Deleting remote ' . $cls . ' associated with Profile:' . $profile_id);
$i = new $cls();
$i->profile_id = $profile_id;
$i->delete();
break;
}
}
}
return false;
}
/**
* Plugin version information
*
* @param array $versions
* @return bool hook true
*/
public function onPluginVersion(array &$versions): bool
{
$versions[] = [
'name' => 'TheFreeNetwork',
'version' => self::MODULE_VERSION,
'author' => 'Bruno Casteleiro',
'homepage' => 'https://notabug.org/diogo/gnu-social/src/nightly/plugins/TheFreeNetwork',
// TRANS: Module description.
'rawdescription' => '"Automagically" migrate internal remote profiles between different federation protocols'
];
return true;
}
/**
* Search remote profile tables to find someone by URI.
* When set to search online, it will grab the remote
* entity's aliases and search with each one.
* The table associated with the class that triggered
* this lookup process will be discarded in the search.
*
* @param string $uri
* @param string $class
* @param bool $online
* @return null|array [Profile:id, class] associated with the remote entity found
*/
private function lookup(string $uri, string $class, bool $online = false): ?array
{
if ($online) {
$this->log(LOG_INFO, 'Searching with online resources for a remote profile with URI: ' . $uri);
$all_ids = LRDDPlugin::grab_profile_aliases($uri);
} else {
$this->log(LOG_INFO, 'Searching for a remote profile with URI: ' . $uri);
$all_ids = [$uri];
}
if ($all_ids == null) {
$this->log(LOG_INFO, 'Unable to find a remote profile with URI: ' . $uri);
return null;
}
foreach ($this->protocols as $p => $cls) {
if ($cls != $class) {
foreach ($all_ids as $alias) {
$profile = $cls::getKV('uri', $alias);
if ($profile instanceof $cls) {
$this->log(LOG_INFO, 'Found a remote ' . $cls . ' associated with Profile:' . $profile->getID());
return [$profile->getID(), $cls];
}
}
}
}
$this->log(LOG_INFO, 'Unable to find a remote profile with URI: ' . $uri);
return null;
}
}