I've got a Xamarin.Forms app (iOS, Android, UWP) connected to Azure Mobile Apps' authentication service. From what I read, it seemed pretty straightforward to implement. I'm testing in a UWP project, and Android, both get the same result.
When logging in, I get this lovely "can't connect to the service you need right now." I don't see anything wrong in my code. What might be going on here?
Windows UWP:
public async Task<bool> Authenticate()
{
string message = string.Empty;
var success = false;
try
{
// Sign in with Facebook login using a server-managed flow.
if (user == null)
{
user = await TaskService.DefaultService.CurrentClient.LoginAsync(MobileServiceAuthenticationProvider.Facebook);
if (user != null)
{
success = true;
message = string.Format("You are now signed-in as {0}.", user.UserId);
}
}
}
catch (Exception ex)
{
message = string.Format("Authentication Failed: {0}", ex.Message);
}
// Display the success or failure message.
await new MessageDialog(message, "Sign-in result").ShowAsync();
return success;
}
Android:
public async Task<bool> Authenticate()
{
var success = false;
var message = string.Empty;
try
{
// Sign in with Facebook login using a server-managed flow.
user = await TaskService.DefaultService.CurrentClient.LoginAsync(this,
MobileServiceAuthenticationProvider.Facebook);
if (user != null)
{
message = string.Format("you are now signed-in as {0}.",
user.UserId);
success = true;
}
}
catch (Exception ex)
{
message = ex.Message;
}
// Display the success or failure message.
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetMessage(message);
builder.SetTitle("Sign-in result");
builder.Create().Show();
return success;
}
Can't connect to service error:
The settings on Facebook for the app:
Visited:
- https://azure.microsoft.com/en-us/documentation/articles/app-service-mobile-xamarin-forms-get-started-users/
- https://azure.microsoft.com/en-us/documentation/articles/app-service-mobile-how-to-configure-facebook-authentication/
- https://developer.xamarin.com/guides/xamarin-forms/web-services/authentication/azure/
EDIT: I've tried moving the client code to App.cs:
private static MobileServiceClient _Client;
public static MobileServiceClient Client
{
get
{
if(_Client == null) _Client = new MobileServiceClient(AppConstants.AzureMobileServiceURL);
return _Client;
}
set { _Client = value; }
}
And the new call in MainPage.xaml.cs:
uesr = await Slated.App.Client.LoginAsync(MobileServiceAuthenticationProvider.Facebook);
Same result!
Another note: My Azure Mobile Services URL does include https://
EDIT 2: Code below for logging on backend, looks to be an issue when redirecting to /login/facebook, the rest of the authentication appears to proceed OK. FYI - replaced the sensitive data with ____
2016-07-29T18:38:43 PID[6684] Verbose Received request: GET https://________.azurewebsites.net/login/facebook
2016-07-29T18:38:43 PID[6684] Information Redirecting: https://www.facebook.com/dialog/oauth?response_type=code&client_id=_____________&redirect_uri=https%3A%2F%2F________.azurewebsites.net%2F.auth%2Flogin%2Ffacebook%2Fcallback&scope=public_profile&state=_____________________________&display=popup
2016-07-29T18:38:50 PID[6684] Verbose Received request: GET https://________.azurewebsites.net/.auth/login/facebook/callback?code=____________________
2016-07-29T18:38:50 PID[6684] Verbose Calling into external HTTP endpoint GET https://graph.facebook.com/oauth/access_token.
2016-07-29T18:38:51 PID[6684] Verbose Calling into external HTTP endpoint GET https://graph.facebook.com/oauth/access_token.
2016-07-29T18:38:51 PID[6684] Verbose Calling into external HTTP endpoint GET https://graph.facebook.com/me.
2016-07-29T18:38:51 PID[6684] Information Login completed for 'Thomas Gardner'. Provider: 'facebook'.
2016-07-29T18:38:51 PID[6684] Verbose Writing 'AppServiceAuthSession' cookie for site '________.azurewebsites.net'. Length: 512.
2016-07-29T18:38:51 PID[6684] Information Redirecting: https://________.azurewebsites.net/login/facebook
2016-07-29T18:38:51 PID[6684] Verbose Received request: GET https://________.azurewebsites.net/login/facebook
2016-07-29T18:38:51 PID[6684] Verbose Found 'AppServiceAuthSession' cookie for site '________.azurewebsites.net'. Length: 512.
2016-07-29T18:38:51 PID[6684] Verbose Authenticated Thomas Gardner successfully using 'Session Cookie' authentication.
2016-07-29T18:38:52 PID[6684] Verbose Received request: GET https://________.azurewebsites.net/login/facebook
2016-07-29T18:38:52 PID[6684] Verbose Found 'AppServiceAuthSession' cookie for site '________.azurewebsites.net'. Length: 512.
2016-07-29T18:38:52 PID[6684] Verbose Authenticated __________ successfully using 'Session Cookie' authentication.
2016-07-29T18:38:52 PID[6684] Information Request, Method=GET, Url=https://________.azurewebsites.net/login/facebook, Message='https://________.azurewebsites.net/login/facebook'
2016-07-29T18:38:52 PID[6684] Information Message='Will use same 'JsonMediaTypeFormatter' formatter', Operation=JsonMediaTypeFormatter.GetPerRequestFormatterInstance
2016-07-29T18:38:52 PID[6684] Information Message='Selected formatter='JsonMediaTypeFormatter', content-type='application/json; charset=utf-8'', Operation=DefaultContentNegotiator.Negotiate
2016-07-29T18:38:52 PID[6684] Information Response, Status=404 (NotFound), Method=GET, Url=https://________.azurewebsites.net/login/facebook, Message='Content-type='application/json; charset=utf-8', content-length=unknown'
Backend Code: It is copied from MSFT's template code. Not much has been done to the startup. Startup.Mobile.App.cs
public partial class Startup
{
public static void ConfigureMobileApp(IAppBuilder app)
{
HttpConfiguration config = new HttpConfiguration();
//For more information on Web API tracing, see http://go.microsoft.com/fwlink/?LinkId=620686
config.EnableSystemDiagnosticsTracing();
new MobileAppConfiguration()
.UseDefaultConfiguration()
.ApplyTo(config);
// Use Entity Framework Code First to create database tables based on your DbContext
Database.SetInitializer(new SlatedInitializer());
// To prevent Entity Framework from modifying your database schema, use a null database initializer
// Database.SetInitializer<SlatedContext>(null);
MobileAppSettingsDictionary settings = config.GetMobileAppSettingsProvider().GetMobileAppSettings();
if (string.IsNullOrEmpty(settings.HostName))
{
// This middleware is intended to be used locally for debugging. By default, HostName will
// only have a value when running in an App Service application.
app.UseAppServiceAuthentication(new AppServiceAuthenticationOptions
{
SigningKey = ConfigurationManager.AppSettings["SigningKey"],
ValidAudiences = new[] { ConfigurationManager.AppSettings["ValidAudience"] },
ValidIssuers = new[] { ConfigurationManager.AppSettings["ValidIssuer"] },
TokenHandler = config.GetAppServiceTokenHandler()
});
}
app.UseWebApi(config);
}
}
public class SlatedInitializer : CreateDatabaseIfNotExists<SlatedContext>
{
protected override void Seed(SlatedContext context)
{
/*List<Tasks> todoItems = new List<Tasks>
{
new Tasks { Id = Guid.NewGuid().ToString(), Text = "First item", Complete = false },
new Tasks { Id = Guid.NewGuid().ToString(), Text = "Second item", Complete = false },
};
foreach (Tasks todoItem in todoItems)
{
context.Set<Tasks>().Add(todoItem);
}*/
base.Seed(context);
}
}
