Login with facebook in Xamarin Forms with Azure Mobile Apps

Question

I’m building an app (with Xamarin.Forms Pcl), where I have a login with facebook, using the Azure Mobile Client SDK. It is possible to perform the authentication, however, right after the authentication, I try to make a listing in the api url: https://adoteumamigo.azurewebsites.net/api/Tipo and have Unauthorized 401 Return.

Being that the login with the social network was carried out successfully. Follows the evidence:

Code where I have the problem:

public async Task<List<Tipo>> GetTipoAsync()
        {
            var httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            var response = await httpClient.GetAsync($"{BaseUrl}Tipo").ConfigureAwait(false);

            if (response.IsSuccessStatusCode)
            {
                using (var responseStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
                {
                    return JsonConvert.DeserializeObject<List<Tipo>>(
                        await new StreamReader(responseStream).ReadToEndAsync().ConfigureAwait(false));
                }
            }

            return null;
        }

Observing: Before placing authentication with facebook, accessing the api and getting the data for listing worked properly. The problem is because you are giving this access without authorization in the url, even after being logged in. Observation 2: You can test the api in the browser, with facebook authentication, and it works correctly.

Answer 1

It seems to me that you are participating in the Xamarin Marathon. To get the profile data I did as follows:

public class AzureService
{
    List<AppServiceIdentity> identities = null;
    public MobileServiceClient Client { get; set; } = null;
    .....
}

---

......
identities = await Client.InvokeApiAsync<List<AppServiceIdentity>>("/.auth/me");
var name = identities[0].UserClaims.Find(c => 
c.Type.Equals("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/givenname")).Value; 

var userToken = identities[0].AccessToken; 

var requestUrl = $"https://graph.facebook.com/v2.9/me/?fields=picture&access_token={userToken}";

var httpClient = new HttpClient();

var userJson = await httpClient.GetStringAsync(requestUrl);

var facebookProfile = JsonConvert.DeserializeObject<FacebookProfile>(userJson)
......

Source: https://github.com/rubgithub/JogoDaVelhaMaratonaXamarin/blob/master/JogoDaVelhaMaratona/JogoDaVelhaMaratona/Service/AzureService.cs