facebook.js

import Facebook from 'appkit/initializers/facebook';

var FacebookAuthenticator = Ember.SimpleAuth.Authenticators.OAuth2.extend({
  authenticate: function() {
    var _this = this;
    return new Ember.RSVP.Promise(function(resolve, reject) {
      FB.getLoginStatus(function(response) {
        if (response.status === 'connected') {
          _this.facebookCallback().then(function(response) {
            var expiresAt = _this.absolutizeExpirationTime(response.expires_in);
            _this.scheduleAccessTokenRefresh(response.expires_in, expiresAt, response.refresh_token);
            resolve(Ember.$.extend(response, { expires_at: expiresAt }));
          });
        } else if (response.status === 'unauthorized') {
          reject("YOU ARE UNAUTHORIZED");
        } else {
          FB.login(function(response) {
            if (response.authResponse) {
              _this.facebookCallback().then(function(response) {
                var expiresAt = _this.absolutizeExpirationTime(response.expires_in);
                 _this.scheduleAccessTokenRefresh(response.expires_in, expiresAt, response.refresh_token);
                resolve(Ember.$.extend(response, { expires_at: expiresAt }));
              });
            } else {
              reject("Could not login to facebook.");
            }
          });
        }
      });
    });
  },
  facebookCallback: function() {
    return ic.ajax('/api/auth/facebook/callback');
  }
});
export default FacebookAuthenticator;