walnut_launchpad.html/js/controllers/signInController.js

app.controller('SignInController', ['$scope', 'Auth', '$location', function ($scope, Auth, $location) {
  var vm = this;
  vm.sign_in = function () {
    // Ask to the server, do your job and THEN set the user
    var user = {
      email: "john@doe.com"
    };
    Auth.setUser(user); //Update the state of the user in the app
    $location.path('/launchpad-home');
  };
}]);