OAuth in asp.net MVC projects

Question

How come online i see both of these? Is there any difference?

var OAuthOptions = new OAuthAuthorizationServerOptions
{
    TokenEndpointPath = new PathString("/Token"),
    AuthorizeEndpointPath = new PathString("/Account/Authorize"),
    Provider = new SimpleAuthorizationServerProvider(UserRepository, UserStore),
    AccessTokenExpireTimeSpan = TimeSpan.FromDays(14),
    AllowInsecureHttp = true
};
app.UseOAuthBearerTokens(OAuthOptions);

and

app.UseOAuthAuthorizationServer(new OAuthAuthorizationServerOptions
{
    AllowInsecureHttp = true,

    TokenEndpointPath = new PathString("/token"),
    AccessTokenExpireTimeSpan = TimeSpan.FromHours(8),

    Provider = new SimpleAuthorizationServerProvider(UserRepository, UserStore)
});
app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());

How come the method UseOAuthBearerTokens takes in OAuthAuthorizationServerOptions as a parameter?

Good question. I don't know if it's just me, but I think the whole Authorization/Authentication/OAuth part of the current state of ASP.NET is an absolute mess. — Tobias
– Tobias, Commented Sep 25, 2014 at 16:18

Thiago Silva · Accepted Answer · 2015-01-15 04:40:01Z

I believe the first one, UseOAuthBearerTokens(options), was added in Web API 2.1, and it encapsulates the call to UseOAuthAuthorizationServer and UseOAuthBearerAuthentication.

Unfortunately, a lot of samples in articles/blogs on the web don't include a publish date, so it's hard to track whether the code is still applicable. And given the speed at which these APIs are being updated, I don't think it will get less confusing.

Here's the code from the Owin.AppBuilderExtensions.cs found in the Microsoft.Owin.Security packages, for reference, as of Web Api v2.2:

public static void UseOAuthBearerTokens(this IAppBuilder app, OAuthAuthorizationServerOptions options)
        {
            if (app == null)
            {
                throw new ArgumentNullException("app");
            }
            if (options == null)
            {
                throw new ArgumentNullException("options");
            }

            app.UseOAuthAuthorizationServer(options);

            app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions
            {
                AccessTokenFormat = options.AccessTokenFormat,
                AccessTokenProvider = options.AccessTokenProvider,
                AuthenticationMode = options.AuthenticationMode,
                AuthenticationType = options.AuthenticationType,
                Description = options.Description,
                Provider = new ApplicationOAuthBearerProvider(),
                SystemClock = options.SystemClock
            });

            app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions
            {
                AccessTokenFormat = options.AccessTokenFormat,
                AccessTokenProvider = options.AccessTokenProvider,
                AuthenticationMode = AuthenticationMode.Passive,
                AuthenticationType = DefaultAuthenticationTypes.ExternalBearer,
                Description = options.Description,
                Provider = new ExternalOAuthBearerProvider(),
                SystemClock = options.SystemClock
            });
        }

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