GCM Push using node-gcm

push.js

'use strict';

var gcm = require('node-gcm'),
    Q = require('q'),
    config = localrequire.config(),
    User = localrequire.service('user');

if (process.env.NODE_ENV === 'production') {

  var sender = new gcm.Sender(config.gcm.key);

  var getRegistrationIds = function(user) {
    return User.preload(user)
      .then(function(user) {
        return user.device.android.registration_ids;
      });
  };

  var sendMessage = function(registrationIds, type, data) {
    var message = {
      collapseKey: type,
      delayWhileIdle: true,
      timeToLive: 60,
      dryRun: false,
      data: {
        title: 'StudyGPS',
        message: 'You \'ve got a message.'
      }
    };

    message.data[type] = data;

    var deferred = Q.defer();

    sender.send(message, registrationIds, 3, function(err, result) {
      if (err) return deferred.reject(err);
      else return deferred.resolve(result);
    });

    return deferred.promise;
  };

  exports.send = function(user, type, data) {
    return getRegistrationIds(user)
      .then(function(registrationIds) {
        if (registrationIds && registrationIds.length > 0) {
          return sendMessage(registrationIds, type, data);
        } else {
          return 'No registration ids for User:' + user + '.';
        }
      })
      .catch(function(err) {
        console.error('err on push:', err);
      });
  };

} else {

  exports.send = function() {};

}