Fetching oauth credentials after asp.net mvc Twitter OAuth2 login

Question

After testing the build-in MVC 5 OAuth2/OpenID providers I was able to create a website which allowed me authenticate myself using my Twitter credentials.

The problem I now encounter is that I also want to store the tokens (oauth_token & oauth_verifier) Twitter posts back, in the url, after a user has been successfully authenticated. I need these tokens so I can allow users to post details directly from my website to their twitter account.

After setting up the TwitterAuthenticationOptions (see below) in the Startup.Auth.cs I did found that the tokens that I'm after can be found in the context (((context.Response.Context).Request).QueryString) but parsing this seems an ugly solution.

 var tw = new TwitterAuthenticationOptions {
       ConsumerKey = "SecretKey",
       ConsumerSecret = "SecretSecret",
       SignInAsAuthenticationType = DefaultAuthenticationTypes.ExternalCookie,
       Provider = new TwitterAuthenticationProvider() {
            OnAuthenticated = (context) => {
                context.Identity.AddClaim(new System.Security.Claims.Claim("urn:twitter:access_token", context.AccessToken, XmlSchemaString, "Twitter"));
                return Task.FromResult(0);
                        }
            }

  };

  app.UseTwitterAuthentication(tw);

How can this gracefully be implemented? For Facebook I found a solution which actually retrieves additional information, this feel similar...

get-more-information-from-social-providers-used-in-the-vs-2013-project-templates

Answer 1

There is a good extension method in Request object. Add following lines in HomeController or controller wherever needed.

Request.GetOwinContext().Authentication.User.Claims // Lists all claims
// Filters by type
Request.GetOwinContext().Authentication.User.FindAll("urn:twitter:access_token")

GetOwinContext will give you the Authentication object where you can find the user object and them the claims.

I found a useful post here How do I access Microsoft.Owin.Security.xyz OnAuthenticated context AddClaims values?

I modified as mentioned in the steps in the post.

AccountController.cs

private async Task SignInAsync(ApplicationUser user, bool isPersistent)
    {
        AuthenticationManager.SignOut(DefaultAuthenticationTypes.ExternalCookie);
        var identity = await UserManager.CreateIdentityAsync(user, DefaultAuthenticationTypes.ApplicationCookie);
        //New method call made here to persist the claims from external cookie
        await SetExternalProperties(identity);
        AuthenticationManager.SignIn(new AuthenticationProperties() { IsPersistent = isPersistent }, identity);
    }

//New method added to persist identity info
private async Task SetExternalProperties(ClaimsIdentity identity)
    {
        // get external claims captured in Startup.ConfigureAuth
        ClaimsIdentity ext = await AuthenticationManager.GetExternalIdentityAsync(DefaultAuthenticationTypes.ExternalCookie);

        if (ext != null)
        {
            var ignoreClaim = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims";
            // add external claims to identity
            foreach (var c in ext.Claims)
            {
                if (!c.Type.StartsWith(ignoreClaim))
                    if (!identity.HasClaim(c.Type, c.Value))
                        identity.AddClaim(c);
            }
        }
    }

try this and let me know.