<?php
require_once dirname (__DIR__) . DIRECTORY_SEPARATOR . "utils" . DIRECTORY_SEPARATOR . "discovery.php";
use Activitypub_Discovery;
use ActivityPubReturn;
use Activitypub_notice;

/**
 * GNU social - a federating social network
 *
 * Todo: Description
 *
 * PHP version 5
 *
 * 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 2015 Free Software Foundaction, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
 * @link      https://gnu.io/social
 */

if (!defined('GNUSOCIAL')) { exit(1); }

class apSharedInboxAction extends ManagedAction
{
    protected $needLogin = false;
    protected $canPost   = true;

    protected function handle ()
    {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            ActivityPubReturn::error ("Only POST requests allowed.");
        }

        $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($data->to)) {
            ActivityPubReturn::error ("To was not specified.");
        }
        if (!isset($data->object)) {
            ActivityPubReturn::error ("Object was not specified.");
        }

        $discovery = new Activitypub_Discovery;

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

        // Public To:
        $public_to = array ("https://www.w3.org/ns/activitystreams#Public",
                            "Public",
                            "as:Public");

        $to_profiles = array ();
        // Generate To objects
        if (is_array ($data->to)) {
            // Remove duplicates from To actors set
            array_unique ($data->to);
            foreach ($data->to as $to_url) {
                try {
                    $to_profiles = array_merge ($to_profiles, $discovery->lookup ($to_url));
                } catch (Exception $e) {
                    // XXX: Invalid actor found, not sure how we handle those
                }
            }
        } else if (empty ($data->to)
                || in_array ($data->to, $public_to)) {
            // No need to do anything else at this point, let's just break out the if
        } else {
            try {
                $to_profiles[]= $discovery->lookup ($data->to);
            } catch (Exception $e) {
                ActivityPubReturn::error ("Invalid Actor.", 404);
            }
        }
        unset ($discovery);

        // Process request
        switch ($data->type) {
            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;
            default:
                ActivityPubReturn::error ("Invalid type value.");
        }
    }
}