/* * Copyright (C) 2017 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/>. */ function requestJson(url, action, params) { return new Promise((resolve, reject) => { const xhr = new XMLHttpRequest(); xhr.overrideMimeType('application/json'); xhr.addEventListener('load', () => resolve(xhr.responseText)); xhr.addEventListener('error', () => reject('failed to execute network request')); xhr.open(action, url); if (params) { xhr.send(JSON.stringify(params)); } else { xhr.send(); } }).then(responseText => { try { return JSON.parse(responseText); } catch (e) { return Promise.reject('invalid JSON response'); } }); }