calendar/src/services/timezoneDataProviderService.js

62 lines
1.7 KiB
JavaScript

/**
* @copyright Copyright (c) 2019 Georg Ehrke
*
* @author Georg Ehrke <oc.list@georgehrke.com>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
import tzData from '../../timezones/zones.json'
import { getTimezoneManager } from 'calendar-js'
import logger from '../utils/logger.js'
const timezoneManager = getTimezoneManager()
let initialized = false
/**
* Gets the timezone-manager
* initializes it if necessary
*
* @returns {TimezoneManager}
*/
export default function() {
if (!initialized) {
initialize()
}
return timezoneManager
}
/**
* Initializes the timezone-manager with all timezones shipped by the calendar app
*/
function initialize() {
logger.debug(`The calendar app is using version ${tzData.version} of the timezone database`)
for (const tzid in tzData.zones) {
if (Object.prototype.hasOwnProperty.call(tzData.zones, [tzid])) {
const ics = [
'BEGIN:VTIMEZONE',
...tzData.zones[tzid].ics,
'END:VTIMEZONE',
].join('\r\n')
timezoneManager.registerTimezoneFromICS(tzid, ics)
}
}
initialized = true
}