asp.net-core - API 不返回 CurrentUser。返回 500 内部服务器错误
问题描述
Startup.cs 文件配置
public void ConfigureServices(IServiceCollection services)
{
services.AddDbContext<DataContext>(options =>
{
options.UseSqlite(Configuration.GetConnectionString("DefaultConnection"));
});
services.AddCors(options =>
{
options.AddPolicy("CorsPolicy", policy =>
{
policy.AllowAnyHeader().AllowAnyMethod().WithOrigins("http://localhost:3000");
});
});
services.AddMediatR(typeof(list.Handler).Assembly);
services.AddMvc(opt => {
var policy = new AuthorizationPolicyBuilder().RequireAuthenticatedUser().Build();
opt.Filters.Add(new AuthorizeFilter(policy));
})
.AddFluentValidation(cfg => cfg.RegisterValidatorsFromAssemblyContaining<create>());
var builder = services.AddIdentityCore<AppUser>();
var identityBuilder = new IdentityBuilder(builder.UserType, builder.Services);
identityBuilder.AddEntityFrameworkStores<DataContext>();
identityBuilder.AddSignInManager<SignInManager<AppUser>>();
services.AddScoped<IJwtGenerator, JwtGenerator>();
services.AddScoped<IUserAccessor, UserAccessor>();
var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration["TokenKey"]));
services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme).AddJwtBearer(
opt => {
opt.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuerSigningKey = true,
IssuerSigningKey = key,
ValidateAudience = false,
ValidateIssuer = false
};
}
);
}
我的 UserDefine 中间件
public class ErrorHandlingMiddleware
{
private readonly RequestDelegate _next;
private readonly ILogger<ErrorHandlingMiddleware> _logger;
public ErrorHandlingMiddleware(RequestDelegate next, ILogger<ErrorHandlingMiddleware> logger)
{
_logger = logger;
_next = next;
}
public async Task Invoke(HttpContext context)
{
try
{
await _next(context);
}
catch (Exception ex)
{
await HandleExceptionAsync(context, ex, _logger);
}
}
private async Task HandleExceptionAsync(HttpContext context, Exception ex,
ILogger<ErrorHandlingMiddleware> logger)
{
object errors = null;
switch(ex)
{
case RestException re:
logger.LogError(ex, "Rest Error");
errors = re.Errors;
context.Response.StatusCode = (int)re.Code;
break;
case Exception e:
logger.LogError(ex, "Server Error");
errors = string.IsNullOrWhiteSpace(e.Message) ? "Error" : e.Message;
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
break;
}
context.Response.ContentType = "application/json";
if(errors != null)
{
var result = JsonConvert.SerializeObject(new {
errors
});
await context.Response.WriteAsync(result);
}
}
}
休息异常文件
public class RestException : Exception
{
public RestException(HttpStatusCode code, object errors = null)
{
Code = code;
Errors = errors;
}
public HttpStatusCode Code { get; }
public object Errors { get; }
}
用户访问器文件
public class UserAccessor : IUserAccessor
{
private readonly IHttpContextAccessor _httpContextAccessor;
public UserAccessor(IHttpContextAccessor httpContextAccessor)
{
_httpContextAccessor = httpContextAccessor;
}
public string GetCurrentUsername()
{
var username = _httpContextAccessor.HttpContext.User?.Claims?.FirstOrDefault( x=> x.Type == ClaimTypes.NameIdentifier)?.Value;
return username;
}
}
这是我将 CurrentUser 信息返回给 API 的 CurrentUser 文件
public class CurrentUser
{
public class Query : IRequest<User> { }
public class Handler : IRequestHandler<Query, User>
{
private readonly IJwtGenerator _jwtGenerator;
private readonly IUserAccessor _userAccessor;
private readonly UserManager<AppUser> _userManager;
public Handler(UserManager<AppUser> userManager, IJwtGenerator jwtGenerator, IUserAccessor userAccessor)
{
_userAccessor = userAccessor;
_jwtGenerator = jwtGenerator;
_userManager = userManager;
}
public async Task<User> Handle(Query request, CancellationToken cancellationToken)
{
var user = await _userManager.FindByNameAsync(_userAccessor.GetCurrentUsername());
return new User
{
DisplayName = user.DisplayName,
Username = user.UserName,
Token = _jwtGenerator.CreateToken(user),
Image = null
};
}
}
}
我通过 POSTMAN 测试了这个,服务器返回 And VsCode 显示这些错误
500 Internal Server Error
fail: API.MiddleWare.ErrorHandlingMiddleware[0] Server Error System.ArgumentNullException: Value cannot be null. (Parameter 'userName') at Microsoft.AspNetCore.Identity.UserManager
1.FindByNameAsync(String userName) 在 Application.Users.CurrentUser.Handler.Handle(Query request, CancellationToken cancelToken) 在 C:\Users\NOYON\source\repos\reactivity\Application\Users\CurrentUser.cs:MediatR 的第 28 行.Pipeline.RequestExceptionProcessorBehavior 2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate
1 next) at MediatR.Pipeline.RequestExceptionProcessorBehavior 2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate
1 next) at MediatR.Pipeline.RequestExceptionActionProcessorBehavior 2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate
1 next) at MediatR.Pipeline.RequestExceptionActionProcessorBehavior 2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate
1 next) at MediatR.Pipeline.RequestPostProcessorBehavior 2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate
1 next) at MediatR.Pipeline.RequestPreProcessorBehavior2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate
1 next) 在 API.Controllers.UserController.CurrentUser() 在 C:\Users\NOYON\source\repos\reactivity\api\Controllers\UserController.cs:line 28 at lambda_method(Closure, Object) at Microsoft.Extensions.Internal .ObjectMethodExecutorAwaitable.Awaiter.GetResult() 在 Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(IActionResultTypeMapper 映射器,ObjectMethodExecutor 执行器,对象控制器,Object[] 参数) 在 Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited| 12_0(ControllerActionInvoker 调用者,ValueTask1 actionResultValueTask) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope) at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger) at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at API.MiddleWare.ErrorHandlingMiddleware.Invoke(HttpContext context) in C:\Users\NOYON\source\repos\reactivity\api\Middleware\ErrorHandlingMiddleware.cs:line 25
当我从 UserController 调用用户时,API 会说
{"errors":"Value cannot be null. (Parameter 'userName')"}
为什么这个 GetCurrentUser() 将用户名返回为空?这不是获取当前用户的正确指令吗?
解决方案
因为您没有发布Startup.cs
文件,所以我不知道您当前的 JWT 配置是什么。但是,如果您使用sub
JWT 中的属性作为用户名,则应在下面添加此行
x.TokenValidationParameters = new TokenValidationParameters
{
...,
NameClaimType = ClaimTypes.NameIdentifier
};
如果您想在 JWT 令牌中获取一个 key,您可以通过以下代码获取
var handler = new JwtSecurityTokenHandler();
var jwtTokenStr = httpRequest.Headers["Authorization"].ToString().Replace("Bearer ", string.Empty, System.StringComparison.Ordinal);
var jwtToken = handler.ReadJwtToken(jwtTokenStr);
// Get Sub by this line
jwtToken.Claims.FirstOrDefault(a => a.Type == JwtClaimTypes.Subject)?.Value
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