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gnu-social-v2-archive-activ.../actions/inbox/Follow.php

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<?php
/**
* 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 Diogo Cordeiro <diogo@fc.up.pt>
* @author Daniel Supernault <danielsupernault@gmail.com>
* @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);
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}
// Validate Object
if (!filter_var($data['object'], FILTER_VALIDATE_URL)) {
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ActivityPubReturn::error('Invalid Object Actor URL.');
}
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// Ensure valid Object profile
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try {
if (!isset($profile)) {
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$object_profile = new Activitypub_explorer;
$object_profile = $object_profile->lookup($data['object'])[0];
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} else {
$object_profile = $profile;
unset($profile);
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}
} catch (Exception $e) {
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ActivityPubReturn::error('Invalid Object Actor URL.', 404);
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}
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// Get Actor's Aprofile
$actor_aprofile = Activitypub_profile::from_profile($actor_profile);
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if (!Subscription::exists($actor_profile, $object_profile)) {
Subscription::start($actor_profile, $object_profile);
common_debug('ActivityPubPlugin: Accepted Follow request from '.$data['actor'].' to '.$data['object']);
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// Notify remote instance that we have accepted their request
common_debug('ActivityPubPlugin: Notifying remote instance that we have accepted their Follow request request from '.$data['actor'].' to '.$data['object']);
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$postman = new Activitypub_postman($actor_profile, [$actor_aprofile]);
$postman->follow();
ActivityPubReturn::answer();
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} else {
common_debug('ActivityPubPlugin: Received a repeated Follow request from '.$data['actor'].' to '.$data['object']);
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ActivityPubReturn::error('Already following.', 409);
}