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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')) {
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exit (1);
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}
// Validate Object
if (!is_string ($data->object)) {
ActivityPubReturn::error ("Invalid Object object, URL expected.");
}
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// Get valid Object profile
try {
$object_profile = new Activitypub_explorer;
$object_profile = $object_profile->lookup ($data->object)[0];
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} catch(Exception $e) {
ActivityPubReturn::error ("Invalid Object Actor URL.", 404);
}
try {
if (!Subscription::exists ($actor_profile, $object_profile)) {
Subscription::start ($actor_profile, $object_profile);
$res = array ("@context" => "https://www.w3.org/ns/activitystreams",
"type" => "Follow",
"actor" => $data->actor,
"object" => $data->object);
ActivityPubReturn::answer ($res);
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} else {
ActivityPubReturn::error ("Already following.", 409);
}
} catch (Exception $e) {
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ActivityPubReturn::error ("Invalid Object Actor URL.", 404);
}