Haketilo

/**

 * Myext storage through connection (server side)

 *

 * Copyright (C) 2021 Wojtek Kosior

 *

 * This code is dual-licensed under:

 * - Asshole license 1.0,

 * - GPLv3 or (at your option) any later version

 *

 * "dual-licensed" means you can choose the license you prefer.

 *

 * This code is released under a permissive license because I disapprove of

 * copyright and wouldn't be willing to sue a violator. Despite not putting

 * this code under copyleft (which is also kind of copyright), I do not want

 * it to be made proprietary. Hence, the permissive alternative to GPL is the

 * Asshole license 1.0 that allows me to call you an asshole if you use it.

 * This means you're legally ok regardless of how you utilize this code but if

 * you make it into something nonfree, you're an asshole.

 *

 * You should have received a copy of both GPLv3 and Asshole license 1.0

 * together with this code. If not, please see:

 * - https://www.gnu.org/licenses/gpl-3.0.en.html

 * - https://koszko.org/asshole-license.txt

 */

"use strict";

(() => {

    const listen_for_connection = window.listen_for_connection;

    const get_storage = window.get_storage;

    const TYPE_PREFIX = window.TYPE_PREFIX;

    const CONNECTION_TYPE = window.CONNECTION_TYPE;

    var storage;

    async function handle_remote_call(port, message)

    {

	let [call_id, func, args] = message;

	try {

	    let result = await Promise.resolve(storage[func](...args));

	    port.postMessage({call_id, result});

	} catch (error) {

	    error = error + '';

	    port.postMessage({call_id, error});

	}

    }

    function remove_storage_listener(cb) {

	storage.remove_change_listener(cb);

    }

    function new_connection(port)

    {

	console.log("new remote storage connection!");

	port.postMessage({

	    [TYPE_PREFIX.SCRIPT] : storage.get_all(TYPE_PREFIX.SCRIPT),

	    [TYPE_PREFIX.BAG] : storage.get_all(TYPE_PREFIX.BAG),

	    [TYPE_PREFIX.PAGE] : storage.get_all(TYPE_PREFIX.PAGE)

	});

	let handle_change = change => port.postMessage(change);

	storage.add_change_listener(handle_change);

	port.onMessage.addListener(m => handle_remote_call(port, m));

	port.onDisconnect.addListener(() =>

				      remove_storage_listener(handle_change));

    }

    async function start()

    {

	storage = await get_storage();

	listen_for_connection(CONNECTION_TYPE.REMOTE_STORAGE, new_connection);

    }

    window.start_storage_server = start;

})();