Myujth

I'm building a .NET Core service that needs to register an OAuth authentication scheme for each entry in a database. I'm using Autofac in addition to .NET's DI.

The problem is that in order to know how to add the Oauth schemes I need to be able to go to the database. Here's what I tried -

public IServiceProvider ConfigureServices(IServiceCollection services)
 
 var builder = new ContainerBuilder();

 var authBuilder = services.AddAuthentication(options =>
 
 options.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
 options.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
 options.DefaultChallengeScheme = "OAuth1";

 )
 .AddCookie();

 builder.Populate(services);
 var container = builder.Build();

 CreateAuths(authBuilder, container).Wait();

 return new AutofacServiceProvider(container);
 

private async Task CreateAuths(AuthenticationBuilder authBuilder, IContainer container)
 
 var dbService = container.Resolve<IDatabaseService>();
 var things = await dbService.GetAllThings().ConfigureAwait(false);

 foreach (var thing in things)
 
 authBuilder.AddOAuth(thing.Name, CreateOAuthOptionsForThing(thing));
 
 

The problem with this is that I'm creating the Oauths to the AuthenticationBuilder AFTER I've called builder.Populate(services); so Autofac doesn't put the OAuths into the object graph.

Any ideas on how to do this correctly?

Thanks!

There's an example of how to do this here - https://github.com/aspnet/AuthSamples/tree/master/samples/DynamicSchemes

Keep in mind that for OAuth schemes, you'll have to do more then just calling schemeProvider.AddScheme and optionsCache.TryAdd - there's also a "postconfigure" step when adding options via the normal method. Here's the class - https://github.com/aspnet/Security/blob/master/src/Microsoft.AspNetCore.Authentication.OAuth/OAuthPostConfigureOptions.cs

So you can register the type "OAuthPostConfigureOptions<OAuthOptions, OAuthHandler<OAuthOptions>>" into your DI container then grab it via a constructor and call OAuthPostConfigureOptions.PostConfigure on your options before adding the options to the optionsCache.