<?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);
}

/**
 * Actor's Inbox
 *
 * @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 apActorInboxAction extends ManagedAction
{
    protected $needLogin = false;
    protected $canPost   = true;

    /**
     * Handle the Actor Inbox request
     *
     * @author Diogo Cordeiro <diogo@fc.up.pt>
     * @return void
     */
    protected function handle()
    {
        try {
            $profile = Profile::getByID($this->trimmed('id'));
        } catch (Exception $e) {
            ActivityPubReturn::error('Invalid Actor URI.', 404);
        }

        if (!$profile->isLocal()) {
            ActivityPubReturn::error("This is not a local user.");
        }

        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            ActivityPubReturn::error("C2S not implemented just yet.");
        }

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

        // Get valid Actor object
        try {
            require_once dirname(__DIR__) . DIRECTORY_SEPARATOR . "utils" . DIRECTORY_SEPARATOR . "explorer.php";
            $actor_profile = new Activitypub_explorer;
            $actor_profile = $actor_profile->lookup($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");

        $to_profiles = array($profile);

        // Process request
        switch ($data->type) {
                        case "Create":
                                require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Create.php";
                                break;
                        case "Delete":
                                require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Delete.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 "Undo":
                                require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Undo.php";
                                break;
                        case "Announce":
                                require_once __DIR__ . DIRECTORY_SEPARATOR . "inbox" . DIRECTORY_SEPARATOR . "Announce.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.");
                }
    }
}