time.js

/**
 * @file time.js
 *   An implementation of XEP-0202 (Entity Time)
 * @author Christoph Burschka
 * @see http://xmpp.org/extensions/xep-0202.html
 */

define(['strophe.js'], ({Strophe, $iq}) => {
  Strophe.addNamespace('TIME', 'urn:xmpp:time');
  Strophe.addConnectionPlugin('time', {
    init(conn) {
      this._c = conn;
      if (this._c.disco) {
        this._c.disco.addFeature(Strophe.NS.TIME);
      }
      this.addHandler();
    },

    /**
     * Request time information from an entity.
     *
     * @param {string} to
     * @param {int} timeout
     *
     * @return {Promise} A promise that resolves to the response.
     */
    query(to, timeout) {
      const id = this._c.getUniqueId('time');
      const iq = $iq({id, to, type: 'get'});
      iq.c('time', {xmlns: Strophe.NS.TIME});

      return new Promise((resolve, reject) => this._c.sendIQ(iq, resolve, reject, timeout));
    },

    /**
     * Respond to a time request.
     *
     * @param {Stanza} request
     *
     * @return {boolean} Always returns true.
     */
    respond(request) {
      const iq = $iq({
        id: request.getAttribute('id'),
        to: request.getAttribute('from'),
        type: 'result',
      });
      iq.c('time', {xmlns: Strophe.NS.TIME});
      iq.c('utc', {}, moment().toISOString());
      iq.c('tzo', {}, moment().format('Z'));
      this._c.sendIQ(iq);
      return true;
    },

    /**
     * Add a time request handler.
     *
     * @param {function} handler (optional, defaults to a simple response).
     *
     * @return A reference to the handler that can be used to remove it.
     */
    addHandler(handler=null) {
      if (this.handler) {
        this._c.deleteHandler(this.handler);
      }
      handler = handler || (request => this.respond(request));
      this.handler = this._c.addHandler(handler, Strophe.NS.TIME, 'iq', 'get');
      return this.handler;
    }
  });
});