如果用户使用Google登录，则ASP.NET Core Identity 2.0 SignoutAsync不会注销用户 [英] ASP.NET Core Identity 2.0 SignoutAsync is not logging out user if the user signed in with Google

问题描述

我已经安装并正在运行Asp.net Core Identity 2.0版.我发现_signinManager.SignoutAsync不会在用户登录Google后注销.当我返回登录方法时，它仅显示用户已登录，而其Claims对象仍保持不变.

I have Asp.net Core Identity version 2.0 Set up and running. I am finding that _signinManager.SignoutAsync is not logging out user once they have signed in with Google. When I go back to my Login Method it just shows the User as logged in with their Claims object still intact.

代码非常简单，如下所示

The code is really simple as below

[AllowAnonymous]
public ActionResult TestGoogle()
{
    var redirectUrl = Url.Action(nameof(ExternalCallback), "Account", new { ReturnUrl = "" });
    var properties = _signInManager.ConfigureExternalAuthenticationProperties("Google", redirectUrl);
    return Challenge(properties, "Google");
}


public async Task<IActionResult> LogOff()
{
    await _signInManager.SignOutAsync();
    return RedirectToAction(nameof(HomeController.Index), "Home");
}

推荐答案

问题是您的RedirectToAction会覆盖对SignOutAsync发出的Identity Server结束会话URL的重定向.

The problem is that your RedirectToAction overwrites the redirect to the Identity Server endsession URL that SignOutAsync issues.

对于SignOutAsync，已经过时的是Authentication部分-从ASP.NET Core 2.0开始，它是HttpContext本身的直接扩展.

As for SignOutAsync, what is obsolete is the Authentication portion -- as of ASP.NET Core 2.0 it's an extension directly off HttpContext itself.

(对相同退出问题的相同解释在此处由Microsoft的HaoK提供.)

(The same explanation for the same signout problem is given here by Microsoft's HaoK.)

解决方案是在AuthenticationProperties对象中发送带有最终SignOutAsync的重定向URL:

The solution is to send a redirect URL in an AuthenticationProperties object with the final SignOutAsync:

// in some controller/handler, notice the "bare" Task return value
public async Task LogoutAction()
{
    // SomeOtherPage is where we redirect to after signout
    await MyCustomSignOut("/SomeOtherPage");
}

// probably in some utility service
public async Task MyCustomSignOut(string redirectUri)
{
    // inject the HttpContextAccessor to get "context"
    await context.SignOutAsync("Cookies");
    var prop = new AuthenticationProperties()
    {
        RedirectUri = redirectUri
    };
    // after signout this will redirect to your provided target
    await context.SignOutAsync("oidc", prop);
}

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