Passport google authentication with javascript fullstack

Question

I'm trying to add google authentication with passport in my application, that has been generated using yeoman fullstack-generator.

Inside my login controller i have this request:

$scope.googleAuth = function(){
  $http.get('/auth/google');
};

but when i call this function i have this error:

XMLHttpRequest cannot load https://accounts.google.com/o/oauth2/auth?response_type=code&redirect_uri=h…d=<my-client-ID-here>. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:9000' is therefore not allowed access.

I tried to fix that problem adding a middleware layer in my express.js file:

app.use(function (req, res, next) {

  // Website you wish to allow to connect
  res.setHeader('Access-Control-Allow-Origin', 'http://localhost:9000');

  // Request methods you wish to allow
  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

  // Request headers you wish to allow
  res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

  // Set to true if you need the website to include cookies in the requests sent
  // to the API (e.g. in case you use sessions)
  res.setHeader('Access-Control-Allow-Credentials', true);

  // Pass to next layer of middleware
  next();
});

but it still not working. Is this the right solution? and is it safe?

Answer 1

I fixed the problem using an hyperlink instead of a button as following

<a target="_self" href="/auth/google" class="btn btn-danger">Google+</a>

I used target="_self"otherwise angular redirects to home page because, I think, it considers /auth/google as a route of my app.