具有Facebook访问令牌的MVC 5 Web API无需Register Cookie即可注册到RegisterExternal

我误以为它接受带有cookie的Social Token！它不直接接受任何外部令牌。

问题是……MVC 5正在为我们处理所有事情，即从社交媒体收集令牌并对其进行验证/处理。之后，它将生成一个本地令牌。

该RegisterExternal方法还需要维护cookie，而解决方案则不需要。

我写了一篇博客文章，将详细解释。在下面添加了直接答案。我的目标是使其融入并感觉到默认MVC Web API的“登录/注册”流程的组成部分，以确保其易于理解。

通过以下解决方案后，Authorize属性必须如下所示才能工作，否则您将获得Unauthorized响应。

[Authorize]
[HostAuthentication(Microsoft.AspNet.Identity.DefaultAuthenticationTypes.ExternalBearer)]
[HostAuthentication(Microsoft.AspNet.Identity.DefaultAuthenticationTypes.ApplicationCookie)]

使用ExternalBearer，如果你希望只允许令牌使用API，使用ApplicationCookie，如果你希望只允许登录cookie的使用API，即从一个网站。如果您要同时使用两者的API，请同时使用两者。

将此动作添加到 AccountController.cs

// POST api/Account/RegisterExternalToken
[OverrideAuthentication]
[AllowAnonymous]
[Route("RegisterExternalToken")]
public async Task<IHttpActionResult> RegisterExternalToken(RegisterExternalTokenBindingModel model)
{
    if (!ModelState.IsValid)
    {
        return BadRequest(ModelState);
    }

    ExternalLoginData externalLogin = await ExternalLoginData.FromToken(model.Provider, model.Token);

    if (externalLogin == null)
    {
        return InternalServerError();
    }

    if (externalLogin.LoginProvider != model.Provider)
    {
        Authentication.SignOut(DefaultAuthenticationTypes.ExternalCookie);
        return InternalServerError();
    }

    ApplicationUser user = await UserManager.FindAsync(new UserLoginInfo(externalLogin.LoginProvider,
        externalLogin.ProviderKey));

    bool hasRegistered = user != null;
    ClaimsIdentity identity = null;
    IdentityResult result;

    if (hasRegistered)
    {
        identity = await UserManager.CreateIdentityAsync(user, OAuthDefaults.AuthenticationType);
        IEnumerable<Claim> claims = externalLogin.GetClaims();
        identity.AddClaims(claims);
        Authentication.SignIn(identity);
    }
    else
    {
        user = new ApplicationUser() { Id = Guid.NewGuid().ToString(), UserName = model.Email, Email = model.Email };

        result = await UserManager.CreateAsync(user);
        if (!result.Succeeded)
        {
            return GetErrorResult(result);
        }

        var info = new ExternalLoginInfo()
        {
            DefaultUserName = model.Email,
            Login = new UserLoginInfo(model.Provider, externalLogin.ProviderKey)
        };

        result = await UserManager.AddLoginAsync(user.Id, info.Login);
        if (!result.Succeeded)
        {
            return GetErrorResult(result);
        }

        identity = await UserManager.CreateIdentityAsync(user, OAuthDefaults.AuthenticationType);
        IEnumerable<Claim> claims = externalLogin.GetClaims();
        identity.AddClaims(claims);
        Authentication.SignIn(identity);
    }

    AuthenticationTicket ticket = new AuthenticationTicket(identity, new AuthenticationProperties());
    var currentUtc = new Microsoft.Owin.Infrastructure.SystemClock().UtcNow;
    ticket.Properties.IssuedUtc = currentUtc;
    ticket.Properties.ExpiresUtc = currentUtc.Add(TimeSpan.FromDays(365));
    var accessToken = Startup.OAuthOptions.AccessTokenFormat.Protect(ticket);
    Request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", accessToken);

    // Create the response building a JSON object that mimics exactly the one issued by the default /Token endpoint
    JObject token = new JObject(
        new JProperty("userName", user.UserName),
        new JProperty("id", user.Id),
        new JProperty("access_token", accessToken),
        new JProperty("token_type", "bearer"),
        new JProperty("expires_in", TimeSpan.FromDays(365).TotalSeconds.ToString()),
        new JProperty(".issued", currentUtc.ToString("ddd, dd MMM yyyy HH':'mm':'ss 'GMT'")),
        new JProperty(".expires", currentUtc.Add(TimeSpan.FromDays(365)).ToString("ddd, dd MMM yyyy HH:mm:ss 'GMT'"))
    );
    return Ok(token);
}

将此辅助方法添加到ExternalLoginData的辅助区域中的类中AccountController.cs

public static async Task<ExternalLoginData> FromToken(string provider, string accessToken)
{
    string verifyTokenEndPoint = "", verifyAppEndpoint = "";

    if (provider == "Facebook")
    {
        verifyTokenEndPoint = string.Format("https://graph.facebook.com/me?access_token={0}", accessToken);
        verifyAppEndpoint = string.Format("https://graph.facebook.com/app?access_token={0}", accessToken);
    }
    else if (provider == "Google")
    {
        return null; // not implemented yet
        //verifyTokenEndPoint = string.Format("https://www.googleapis.com/oauth2/v1/tokeninfo?access_token={0}", accessToken);
    }
    else
    {
        return null;
    }

    HttpClient client = new HttpClient();
    Uri uri = new Uri(verifyTokenEndPoint);
    HttpResponseMessage response = await client.GetAsync(uri);
    ClaimsIdentity identity = null;
    if (response.IsSuccessStatusCode)
    {
        string content = await response.Content.ReadAsStringAsync();
        dynamic iObj = (Newtonsoft.Json.Linq.JObject)Newtonsoft.Json.JsonConvert.DeserializeObject(content);

        uri = new Uri(verifyAppEndpoint);
        response = await client.GetAsync(uri);
        content = await response.Content.ReadAsStringAsync();
        dynamic appObj = (Newtonsoft.Json.Linq.JObject)Newtonsoft.Json.JsonConvert.DeserializeObject(content);

        identity = new ClaimsIdentity(OAuthDefaults.AuthenticationType);

        if (provider == "Facebook")
        {
            if (appObj["id"] != Startup.facebookAuthOptions.AppId)
            {
                return null;
            }

            identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, iObj["id"].ToString(), ClaimValueTypes.String, "Facebook", "Facebook"));

        }
        else if (provider == "Google")
        {
            //not implemented yet
        }
    }

    if (identity == null)
        return null;

    Claim providerKeyClaim = identity.FindFirst(ClaimTypes.NameIdentifier);

    if (providerKeyClaim == null || String.IsNullOrEmpty(providerKeyClaim.Issuer) || String.IsNullOrEmpty(providerKeyClaim.Value))
        return null;

    if (providerKeyClaim.Issuer == ClaimsIdentity.DefaultIssuer)
        return null;

    return new ExternalLoginData
    {
        LoginProvider = providerKeyClaim.Issuer,
        ProviderKey = providerKeyClaim.Value,
        UserName = identity.FindFirstValue(ClaimTypes.Name)
    };
}

最后RegisterExternalTokenBindingModel是动作所使用的

public class RegisterExternalTokenBindingModel
{
    [Required]
    [Display(Name = "Email")]
    public string Email { get; set; }

    [Required]
    [Display(Name = "Token")]
    public string Token { get; set; }

    [Required]
    [Display(Name = "Provider")]
    public string Provider { get; set; }
}

是的，我们在注册时将电子邮件和令牌详细信息一起传递，这不会导致您在使用Twitter时更改代码，因为Twitter不向用户提供电子邮件。我们验证令牌来自我们的应用程序。一旦电子邮件注册，被黑客入侵或其他人的令牌无法用于更改电子邮件或获取该电子邮件的本地令牌，因为无论发送的电子邮件是什么，它将始终为所传递的社交令牌的实际用户返回本地令牌。

RegisterExternalToken 端点通过两种方式来获取令牌，即注册用户并发送本地令牌，或者如果用户已经注册，则发送令牌。