/* * Copyright (C) 2019 Alex Yatskov <alex@foosoft.net> * Author: Alex Yatskov <alex@foosoft.net> * * 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 <http://www.gnu.org/licenses/>. */ class FrontendApiReceiver { constructor(source='', handlers={}) { this.source = source; this.handlers = handlers; chrome.runtime.onConnect.addListener(this.onConnect.bind(this)); } onConnect(port) { if (port.name !== 'frontend-api-receiver') { return; } port.onMessage.addListener(this.onMessage.bind(this, port)); } onMessage(port, {id, action, params, target, senderId}) { if ( target !== this.source || !this.handlers.hasOwnProperty(action) ) { return; } this.sendAck(port, id, senderId); const handler = this.handlers[action]; handler(params).then( result => { this.sendResult(port, id, senderId, {result}); }, e => { const error = typeof e.toString === 'function' ? e.toString() : e; this.sendResult(port, id, senderId, {error}); }); } sendAck(port, id, senderId) { port.postMessage({type: 'ack', id, senderId}); } sendResult(port, id, senderId, data) { port.postMessage({type: 'result', id, senderId, data}); } }