在默认MVC5应用程序中的帐户关联步骤中从外部提供商Google和Facebook获取电子邮件

Question

显然,您可以通过在以下FacebookAuthenticationOptions对象中添加范围来向Facebook提供商执行此操作Startup.Auth.cs:

http://blogs.msdn.com/b/webdev/archive/2013/10/16/get-more-information-from-social-providers-used-in-the-vs-2013-project-templates.aspx

List<string> scope = new List<string>() { "email" };
var x = new FacebookAuthenticationOptions();
x.Scope.Add("email");
...
app.UseFacebookAuthentication(x);

如何与Google提供商进行相同的操作？类/对象没有x.Scope属性GoogleAuthenticationOptions!

Answer 1

请在本帖子的底部看到更新!

以下适合我的Facebook:

StartupAuth.cs:

var facebookAuthenticationOptions = new FacebookAuthenticationOptions()
{
    AppId = "x",
    AppSecret = "y"
};
facebookAuthenticationOptions.Scope.Add("email");
app.UseFacebookAuthentication(facebookAuthenticationOptions);

ExternalLoginCallback方法:

var externalIdentity = HttpContext.GetOwinContext().Authentication.GetExternalIdentityAsync(DefaultAuthenticationTypes.ExternalCookie);
var emailClaim = externalIdentity.Result.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Email);
var email = emailClaim.Value;

而对于谷歌:

StartupAuth.cs

app.UseGoogleAuthentication();

ExternalLoginCallback方法(与facebook相同):

var externalIdentity = HttpContext.GetOwinContext().Authentication.GetExternalIdentityAsync(DefaultAuthenticationTypes.ExternalCookie);
var emailClaim = externalIdentity.Result.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Email);
var email = emailClaim.Value;

如果我在这里设置断点:

var email = emailClaim.Value;

我在调试器中看到了Facebook和Google的电子邮件地址.

更新1:旧答案让我感到困惑所以我用自己项目中的代码更新了它,我刚刚调试过,我知道有效.

更新2:使用新的ASP.NET Identity 2.0 RTM版本,您不再需要本文中的任何代码.获取电子邮件的正确方法是简单地执行以下操作:

1. Startup.Auth.cs

       app.UseFacebookAuthentication(
          appId: "x",
          appSecret: "y");
   
       app.UseGoogleAuthentication();
   

2. AccountController.cs

   //
   // GET: /Account/ExternalLoginCallback
   [AllowAnonymous]
   public async Task<ActionResult> ExternalLoginCallback(string returnUrl)
   {
       var loginInfo = await AuthenticationManager.GetExternalLoginInfoAsync();
       if (loginInfo == null)
       {
           return RedirectToAction("Login");
       }
   
       // Sign in the user with this external login provider if the user already has a login
       var result = await SignInHelper.ExternalSignIn(loginInfo, isPersistent: false);
       switch (result)
       {
           case SignInStatus.Success:
               return RedirectToLocal(returnUrl);
           case SignInStatus.LockedOut:
               return View("Lockout");
           case SignInStatus.RequiresTwoFactorAuthentication:
               return RedirectToAction("SendCode", new { ReturnUrl = returnUrl });
           case SignInStatus.Failure:
           default:
               // If the user does not have an account, then prompt the user to create an account
               ViewBag.ReturnUrl = returnUrl;
               ViewBag.LoginProvider = loginInfo.Login.LoginProvider;
               return View("ExternalLoginConfirmation", new ExternalLoginConfirmationViewModel { Email = loginInfo.Email });
       }
   }
   

Answer 2

您需要显式配置FacebookAuthenticationOptions以从经过身份验证的用户获取电子邮件地址.

在MVC5项目中,在Startup.Auth.cs中添加这些行

        var options = new FacebookAuthenticationOptions() {
            AppId = "xxxxxxxx",
            AppSecret = "xxxxxxxxx"
        };
        options.Scope.Add("email");
        app.UseFacebookAuthentication(options);

更新 将我的示例代码减少到绝对最小值.你的更新代码顺便说一下,我也试过Facebook和谷歌.