AngularJS integration with Google OAuth

I'm working on integrating Google OAuth in AngularJS. Below is the code snippet for creating a Google sign-in button and the corresponding callback function.

// Function for initializing Google sign-in
  <script type="text/javascript>
    a = function() {
     var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
     po.src = 'https://apis.google.com/js/client:plusone.js';
     var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
   };
  </script>

  // Callback function after signing in
  <script type="text/javascript>
    var access_token = ''
    function signinCallback(authResult) {
      console.log(authResult)
      if (authResult['status']['signed_in']) {
        access_token = authResult['access_token']
        if (window.location.pathname != "/album")
          window.location = "/#/albums";
        document.getElementById('signinButton').setAttribute('style', 'display: none');
      } else {
        console.log('Sign-in state: ' + authResult['error']);
      }
    }  
  </script>    

The above code is triggered on every page load. It saves the access token provided by Google in a variable called access_token. I have an angular service that utilizes this access_token to interact with the Google API. Here is the code snippet for that -

picasaServices.factory('Phone', ['$resource',
  function($resource){
    return $resource('https://picasaweb.google.com/data/feed/api/user/default', {}, {
      query: {method: 'GET', params:{alt: 'json', access_token: access_token}, isArray: false}
    });
  }
]);

The issue I'm facing is that the Angular service runs before Google returns the access token, causing it to execute with an empty access_token. How can I resolve this problem? I am also open to feedback on my overall approach.

Answer №1

Finding a solution to this issue is not straightforward. It is important to consider that your authentication may be successful before Angular has finished initializing, but it could also be the other way around.

There are various strategies you can explore to address this challenge. It is worth noting that attempting to access a Google API without a valid access token will result in a 401 error. Additionally, a 401 error can occur naturally after the token expires, usually after one hour. Therefore, it is necessary to handle a 401 response in your code, which can also be used to manage the scenario where AngularJS initializes before the token is available. It is crucial to avoid calling the authentication process multiple times to prevent issues.

Hopefully, someone at Google is currently working on developing an AngularJS-friendly wrapper for the JavaScript library.

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