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/*
* Copyright (C) 2017-2020 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 <https://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(new Error('Failed to connect')));
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(new Error('Invalid response'));
}
});
}
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