<?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);
}

/**
 * Shared Inbox Handler
 *
 * @category  Plugin
 * @package   GNUsocial
 * @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 apSharedInboxAction extends ManagedAction
{
    protected $needLogin = false;
    protected $canPost   = true;

    /**
     * Handle the Shared Inbox request
     *
     * @author Diogo Cordeiro <diogo@fc.up.pt>
     * @return void
     */
    protected function handle()
    {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            ActivityPubReturn::error("Only POST requests allowed.");
        }

        common_debug('ActivityPub Shared Inbox: Received a POST request.');
        $data = file_get_contents('php://input');
        common_debug('ActivityPub Shared Inbox: Request contents: '.$data);
        $data = json_decode(file_get_contents('php://input'));

        // Validate data
        if (!isset($data->type)) {
            ActivityPubReturn::error("Type was not specified.");
        }
        if (!isset($data->actor)) {
            ActivityPubReturn::error("Actor was not specified.");
        }
        if (!isset($data->object)) {
            ActivityPubReturn::error("Object was not specified.");
        }

        $discovery = new Activitypub_explorer;
        // Get valid Actor object
        try {
            $actor_profile = $discovery->lookup($data->actor);
            $actor_profile = $actor_profile[0];
        } catch (Exception $e) {
            ActivityPubReturn::error("Invalid Actor.", 404);
        }
        unset($discovery);

        // Public To:
        $public_to = ["https://www.w3.org/ns/activitystreams#Public",
                      "Public",
                      "as:Public"
                     ];

        $to_profiles = "https://www.w3.org/ns/activitystreams#Public";

        // Process request
        switch ($data->type) {
            // Data available:
            // Profile       $actor_profile
            // string|object $data->object
            case "Create":
                    require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Create.php";
                    break;
            case "Follow":
                    require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Follow.php";
                    break;
            case "Like":
                    require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Like.php";
                    break;
            case "Announce":
                    require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Announce.php";
                    break;
            case "Undo":
                    require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Undo.php";
                    break;
            case "Delete":
                    require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Delete.php";
                    break;
            case "Accept":
                    require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Accept.php";
                    break;
            case "Reject":
                    require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Reject.php";
                    break;
            default:
                    ActivityPubReturn::error("Invalid type value.");
        }
    }
}