CODEWITHSUNDEEP
javascript
Sergei Basharov
Sergei Basharov

Reputation: 53850

Check if user is authenticated synchronously

I want to check if a user is authenticated in my app. The issue is I don't want to be cursed by the JS Lord if I use it in synchronous manner. What I want ideally is to have a function

Api.User.isAuthenticated()

which I would run like this:

if (Api.User.isAuthenticated())
    {
        Views.renderDashboard()
    }
else
    {
        Views.renderLogin()
    }

Right now I implemented this function as a promise and it works fine but looks overcomplicated for simple things like checking user login status.

I use qwest library to make XHR requests. It returns promises, code looks like this:

Api.User.isAuthenticated = function(token)
    {
        return qwest.get('/session', token)
    }

Api.User.isAuthenticated(token)
    .then(function (response) {
        //
    })
    .catch(function (e, response) {
        //
    });

How should I approach this problem?

Upvotes: 0

Views: 173

Answers (1)

Mark
Mark

Reputation: 12535

If your authentication method requires async, you could try simply using a callback:

Api.User.checkAuthentication = function(token, callback) {
  qwest.get('/session', token).then(function (response) {
    // Check your response here, send true or false to the callback as appropriate
    callback(true);
  })
  .catch(function (e, response) {
    // You should probably notify the user of the error here, that it wasn't
    // just an invalid username/password combo
    callback(false);
  });
}

Api.User.checkAuthentication('token', function (authenticated) {
  if (authenticated) {
    Views.renderDashboard();
  } else {
    Views.renderLogin();
  }
})

This whole method could be put into a function, say, checkAuth(), which can be called when needed. You could go further and pass callbacks to checkAuth, to run custom code when we check if the user is authenticated or not.

Upvotes: 1

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