@jellybrick/mpris-service/dist/interfaces/mpris-interface.js

Node.js implementation for the MPRIS D-Bus Interface Specification to create a mediaplayer service

"use strict";

const dbus = require('@jellybrick/dbus-next');
const types = require('./types');
const deepEqual = require('deep-equal');
const constants = require('../constants');
const logging = require('../logging');
const {
  Interface
} = dbus.interface;
class MprisInterface extends Interface {
  constructor(name, player) {
    super(name);
    this.player = player;
  }
  _setPropertyInternal(property, valueDbus) {
    // nothing is currently settable internally that needs conversion to plain
    this.player.emit(property[0].toLowerCase() + property.substring(1), valueDbus);
  }
  setProperty(property, valuePlain) {
    // convert the plain value to a dbus value (default to the plain value)
    let valueDbus = valuePlain;
    if (property === 'Metadata') {
      valueDbus = types.metadataToDbus(valuePlain);
    } else if (property === 'ActivePlaylist') {
      if (valuePlain) {
        valueDbus = [true, types.playlistToDbus(valuePlain)];
      } else {
        valueDbus = [false, types.emptyPlaylist];
      }
    } else if (property === 'Tracks') {
      valueDbus = valuePlain.filter(t => t['mpris:trackid']).map(t => t['mpris:trackid']);
    }
    if (!deepEqual(this[`_${property}`], valueDbus)) {
      this[`_${property}`] = valueDbus;
      if (property === 'LoopStatus' && !constants.isLoopStatusValid(valuePlain)) {
        logging.warn(`setting player loop status to an invalid value: ${valuePlain}`);
      } else if (property === 'PlaybackStatus' && !constants.isPlaybackStatusValid(valuePlain)) {
        logging.warn(`setting player playback status to an invalid value: ${valuePlain}`);
      } else {
        let changedProperties = {};
        changedProperties[property] = valueDbus;
        Interface.emitPropertiesChanged(this, changedProperties);
      }
    }
  }
}
module.exports = MprisInterface;
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