MVC 4 OAuth integration. What is next and how to get any information from data provider?

Question

I found a lot of posts and articles with very detailed information about how to configure MVC 4 application to be integrated with any social network provider and how to authenticate users, but what's next? How to get any information about authenticated user, for example? The simplest task that coming to my head how to get some information about authenticated user - first name, last name, avatar's url, friends list etc.?

Update:

1. Here is some post and article that share some light
2. Useful article how to interact with Facebook

Answer 1

OAuth is for authenticating only, i.e. getting an access token. Once you get this access token you could use it to retrieve this information from the service provider. Consult the documentation of the provider to see how this could be done.

There are some claims you might retrieve though such as FirstName and LastName because they are standard and most providers support them. For example inside the ExternalLoginCallback callback you could attempt to retrieve this information from the result.ExtraData dictionary:

[AllowAnonymous]
public ActionResult ExternalLoginCallback(string returnUrl)
{
    AuthenticationResult result = OAuthWebSecurity.VerifyAuthentication(Url.Action("ExternalLoginCallback", new { ReturnUrl = returnUrl }));
    if (!result.IsSuccessful)
    {
        return RedirectToAction("ExternalLoginFailure");
    }

    if (OAuthWebSecurity.Login(result.Provider, result.ProviderUserId, createPersistentCookie: false))
    {
        return RedirectToLocal(returnUrl);
    }

    if (User.Identity.IsAuthenticated)
    {
        // Here you could use result.ExtraData dictionary
        string name = result.ExtraData["name"];


        // If the current user is logged in add the new account
        OAuthWebSecurity.CreateOrUpdateAccount(result.Provider, result.ProviderUserId, User.Identity.Name);
        return RedirectToLocal(returnUrl);
    }
    else
    {
        // User is new, ask for their desired membership name
        string loginData = OAuthWebSecurity.SerializeProviderUserId(result.Provider, result.ProviderUserId);
        ViewBag.ProviderDisplayName = OAuthWebSecurity.GetOAuthClientData(result.Provider).DisplayName;
        ViewBag.ReturnUrl = returnUrl;
        return View("ExternalLoginConfirmation", new RegisterExternalLoginModel { UserName = result.UserName, ExternalLoginData = loginData });
    }
}

But the different providers might use different keys. So depending on the provider that was used you will have to use the proper key to read the desired information.