从WebAPI控制器获取声明-JWT令牌，

问题描述

我已经构建了一个在ASP.NET Core中使用JWT承载身份验证的应用程序.进行身份验证时，我定义了一些自定义声明，我需要在其他WebAPI控制器中读取这些声明才能执行某些操作.

I have built an application which uses JWT bearer authentication in ASP.NET Core. When authenticating I define some custom claims which i need to read in another WebAPI controller in order to execute some actions.

任何想法我该如何实现?

Any ideas How Can I achieve this?

我的代码如下:(代码已简化)

This how my code looks like:(Code has been simplified)

public async Task<IActionResult> AuthenticateAsync([FromBody] UserModel user)
    {
        ..............

                var tokenHandler = new JwtSecurityTokenHandler();
                var key = Encoding.ASCII.GetBytes(_appSettings.Secret);
                var tokenDescriptor = new SecurityTokenDescriptor
                {
                    Subject = new ClaimsIdentity(new Claim[]
                    {
                        new Claim("userSecurityKey", userDeserialized.SecurityKey.ToString()),
                        new Claim("timeStamp",timeStamp),
                        new Claim("verificationKey",userDeserialized.VerificationKey.ToString())

                    }),
                    Expires = DateTime.UtcNow.AddDays(7),
                    SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key),
                        SecurityAlgorithms.HmacSha256Signature)
                };
                var token = tokenHandler.CreateToken(tokenDescriptor);
                var tokenString = tokenHandler.WriteToken(token);

     .................

    }

另一个控制器:(它需要阅读"verificationKey"声明.)

Another controller: (It Needs to read "verificationKey" claim.)

    [HttpGet]
    [Route("getcandidate")]
    public async Task<IActionResult> GetCandidateAsync()
    {

        try
        {
             ............


            var verificationKey = //TODO: GET VerificationKey FROM THE TOKEN

            var verificationRecord = await service.GetVerificationRecordAsync(verificationKey);

            .................

        }
        catch (Exception)
        {
            return NotFound();
        }
    }

推荐答案

您应该能够在控制器中检索这样的声明

You should be able to retrieve a claims like this within your controller

var identity = HttpContext.User.Identity as ClaimsIdentity;
if (identity != null)
{
    IEnumerable<Claim> claims = identity.Claims;
    // or
    identity.FindFirst("ClaimName").Value;

}

如果需要，您可以为IPrincipal接口编写扩展方法，并使用上面的代码检索声明，然后使用(例如)检索声明

If you wanted, you could write extension methods for the IPrincipal interface and retrieve claims using the code above, then retrieve them using (for example)

HttpContext.User.Identity.MethodName();

---

答案的完整性.为了解码JWT令牌，让我们编写一个方法来验证令牌并提取信息.

---

For completeness of the answer. To Decode the JWT token let's write a method to validate the token and extract the information.

public static ClaimsPrincipal ValidateToken(string jwtToken)
    {
        IdentityModelEventSource.ShowPII = true;

        SecurityToken validatedToken;
        TokenValidationParameters validationParameters = new TokenValidationParameters();

        validationParameters.ValidateLifetime = true;

        validationParameters.ValidAudience = _audience.ToLower();
        validationParameters.ValidIssuer = _issuer.ToLower();
        validationParameters.IssuerSigningKey = new Microsoft.IdentityModel.Tokens.SymmetricSecurityKey(Encoding.UTF8.GetBytes(_appSettings.Secret));

        ClaimsPrincipal principal = new JwtSecurityTokenHandler().ValidateToken(jwtToken, validationParameters, out validatedToken);


        return principal;
    }

现在我们可以使用以下方法来验证并提取声明:

Now we can validate and extract the Claims by using:

ValidateToken(tokenString)?.FindFirst("ClaimName")?.Value

您应该注意，如果验证失败，ValidateToken方法将返回null值.

You should note that the ValidateToken method will return null value if the validation fails.

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