How to get basic user information in an Azure Mobile Web App?

Question

I have a Xamarin.Forms app, and I'd like to implement its authentication features based on FaceBook and Azure. The authentication itself work, but I have not found the way to get basic user info from it (name, email...)

var user = await DependencyService.Get<IMobileClient>()
            .LoginAsync(MobileServiceAuthenticationProvider.Facebook);

On server side

 var mobileAppUser = (MobileAppUser)User;
 var facebookCredentials = 
     user.GetIdentityAsync<FacebookCredentials>().Result;

mobileAppUser exists, but facebookCredentials is always null.

My backend on Azure is a new mobile web app written in .net. All of its features working great, except this authentication question. I could not find the proper way to solve this problem on server side or on client side. Pls. note, my question is about the new way of Azure mobile apps, not the old classic one.

Would you be so kind to help me? Any sample code or documentation are warmly welcomed.

Thanks in advance!

Answer 1

Too long for a comment

If you check out the implementation of GetIdentityAsync, you'll see the following:

• It checks if the user is authenticated (you said that the user is authenticated so there's no problem here)
• reads the "EMA_RuntimeUrl" from the config (it's not null, because then you'd get an exception)
• it check if the token from the provider is valid or not. If not, this returns null.

I believe this is the issue you are running into. A quick search on this issue brings you to this SO question.

So have you created an EMA_RuntimeUrl manually in mobile app in azure portal in Application Properties, and assigned to Gateway address?