需要检查 jwt 令牌在内核中是否有效/asp.net 过期

Question

为了生成JWT令牌，我使用以下代码：

var tokenHandler = new JwtSecurityTokenHandler();
var key = Encoding.ASCII.GetBytes(_consumerConfiguration.SecretKey);
var tokenDescriptor = new SecurityTokenDescriptor
{
Subject = new ClaimsIdentity(new Claim[]
{
new Claim(ClaimTypes.Name, "ConsumerId")
}),
Expires = DateTime.Now.AddMinutes(1),
SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature)
};
var token = tokenHandler.CreateToken(tokenDescriptor);
return tokenHandler.WriteToken(token);

这是我在注册服务中的代码

var appSettingsSection = configuration.GetSection("ConsumerConfiguration");
services.Configure<ConsumerConfiguration>(appSettingsSection);
var appSettings = appSettingsSection.Get<ConsumerConfiguration>();
var key = Encoding.ASCII.GetBytes(appSettings.SecretKey);
services.AddAuthentication(x =>
{
x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(x =>
{
x.RequireHttpsMetadata = false;
x.SaveToken = true;
x.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
IssuerSigningKey = new SymmetricSecurityKey(key),
ValidateIssuer = false,
ValidateAudience = false
};
});
services.AddScoped<Microsoft.AspNetCore.Authorization.IAuthorizationHandler, ConsumerAuthorizationHandler>();

我将其用作过滤器，在应用程序中全局注册自定义授权处理程序：

var policy = new AuthorizationPolicyBuilder().RequireCustomClaim(ClaimTypes.Name).
AddAuthenticationSchemes(JwtBearerDefaults.AuthenticationScheme).Build();
options.Filters.Add(new AuthorizeFilter(policy));
})

这是我的自定义授权处理程序

#region constructor
public ConsumerAuthorizationHandler(IOptions<ConsumerConfiguration> consumerConfiguration)
{
_consumerConfiguration = consumerConfiguration.Value;
}
#endregion
protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, CustomRequireClaim requirement)
{
if (!_consumerConfiguration.EnableAuthorizationFilter)
context.Succeed(requirement);
var hasClaim = context.User.Claims.Any(x => x.Type == requirement.ClaimType);
if (hasClaim)
{
context.Succeed(requirement);
}
return Task.CompletedTask;
}
}
public static class AuthorizationPolicyBuilderExtensions
{
public static AuthorizationPolicyBuilder RequireCustomClaim(this AuthorizationPolicyBuilder builder, string claimType)
{
return builder.AddRequirements(new CustomRequireClaim(claimType));
}
}

问题是：如何检查 JWT 是否已过期？令牌似乎不会过期。我必须添加什么代码才能检查令牌是否已过期？

Answer 1

默认情况下，身份验证流会为您处理此问题。它甚至在您到达授权层之前就发生了。