yomichan/ext/bg/js/backend-api-forwarder.js
toasted-nutbread 6c341a13d8
Refactor frontend API classes (#482)
* Mark functions as private

* Remove constructor side effects

* Use safer handler invocation

* Mark functions as private

* Mark fields as private

* Update BackendApiForwarder public API
2020-05-02 12:50:44 -04:00

45 lines
1.5 KiB
JavaScript

/*
* Copyright (C) 2019-2020 Yomichan Authors
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
class BackendApiForwarder {
prepare() {
chrome.runtime.onConnect.addListener(this._onConnect.bind(this));
}
_onConnect(port) {
if (port.name !== 'backend-api-forwarder') { return; }
let tabId;
if (!(
port.sender &&
port.sender.tab &&
(typeof (tabId = port.sender.tab.id)) === 'number'
)) {
port.disconnect();
return;
}
const forwardPort = chrome.tabs.connect(tabId, {name: 'frontend-api-receiver'});
port.onMessage.addListener((message) => forwardPort.postMessage(message));
forwardPort.onMessage.addListener((message) => port.postMessage(message));
port.onDisconnect.addListener(() => forwardPort.disconnect());
forwardPort.onDisconnect.addListener(() => port.disconnect());
}
}