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/**
* This file is part of Haketilo.
*
* Function: Message server.
*
* Copyright (C) 2021 Wojtek Kosior
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use of this code in a
* proprietary program, I am not going to enforce this in court.
*/
#FROM common/browser.js IMPORT browser
let listeners = {};
let listening = false;
function raw_listen(port)
{
if (listeners[port.name] === undefined)
return;
listeners[port.name](port);
}
/* magic should be one of the constants from /common/connection_types.js */
function listen_for_connection(magic, cb)
{
if (!listening) {
listening = true;
browser.runtime.onConnect.addListener(raw_listen);
}
listeners[magic] = cb;
}
#EXPORT listen_for_connection
/*
* Messaging background page from itself might result in messages being silently
* discarded. Here we implement an interface (somewhat) compatible with the one
* provided by the browser, but which allows for background page to communicate
* with itself.
*/
function EvTarget()
{
this.listeners = new Set();
this.addListener = cb => this.listeners.add(cb);
this.removeListener = cb => this.listeners.delete(cb);
this.dispatch = msg => this.listeners.forEach(l => l(msg));
}
function Port(magic)
{
this.name = magic;
this.onDisconnect = new EvTarget();
this.onMessage = new EvTarget();
this.postMessage = msg => this.other.onMessage.dispatch(msg);
this.disconnect = () => this.other.onDisconnect.dispatch(this.other);
}
let bg_page_url;
function connect_to_background(magic)
{
if (bg_page_url === undefined)
bg_page_url = browser.runtime.getURL("_generated_background_page.html");
if (typeof document === "undefined" || document.URL !== bg_page_url)
return browser.runtime.connect({name: magic});
if (!(magic in listeners))
throw `no listener for '${magic}'`;
const ports = [new Port(magic), new Port(magic)];
ports[0].other = ports[1];
ports[1].other = ports[0];
listeners[magic](ports[0]);
return ports[1];
}
#EXPORT connect_to_background
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