AddJwtBearer OnAuthenticationFailed 返回自定义错误

Question

我正在使用Openidict。
我正在尝试使用自定义状态代码返回自定义消息，但我无法做到。我在startup.cs中的配置：

services.AddAuthentication(options =>
            {
                options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
                options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
            })
            .AddJwtBearer(o =>
            {
                o.Authority = this.Configuration["Authentication:OpenIddict:Authority"];
                o.Audience = "MyApp";           //Also in Auhorization.cs controller.
                o.RequireHttpsMetadata = !this.Environment.IsDevelopment();
                o.Events = new JwtBearerEvents()
                {
                    OnAuthenticationFailed = context =>
                    {
                        context.Response.StatusCode = HttpStatusCodes.AuthenticationFailed;
                        context.Response.ContentType = "application/json";
                        var err = this.Environment.IsDevelopment() ? context.Exception.ToString() : "An error occurred processing your authentication.";
                        var result = JsonConvert.SerializeObject(new {err});
                        return context.Response.WriteAsync(result);
                    }
                };
            });

但问题是没有返回内容。 Chrome 开发者工具报告

（失败）

对于状态和

加载响应数据失败

响应。

我也试过了：

context.Response.WriteAsync(result).Wait();
return Task.CompletedTask;

但结果是一样的。

期望的行为：
我想返回自定义状态代码并显示出了什么问题。

Answer 1

遇到同样的问题，尝试了 Pinpoint 提供的解决方案，但它在 ASP.NET core 2.0 上对我不起作用。但是基于 Pinpoint 的解决方案和一些试验和错误，以下代码对我有用。

var builder = services.AddAuthentication(options =>
        {
            options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
            options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
        }).AddJwtBearer(o =>
        {
            o.Authority = "http://192.168.0.110/auth/realms/demo";
            o.Audience = "demo-app";
            o.RequireHttpsMetadata = false;

            o.Events = new JwtBearerEvents()
            {
                OnAuthenticationFailed = c =>
                {
                    c.NoResult();
                    c.Response.StatusCode = 500;
                    c.Response.ContentType = "text/plain";
                    c.Response.WriteAsync(c.Exception.ToString()).Wait();
                    return Task.CompletedTask;
                },
                OnChallenge = c =>
                {
                    c.HandleResponse();
                    return Task.CompletedTask;
                }
            };
        });

Answer 2

请务必注意，当返回 401 响应时，aspnet-contrib OAuth2 验证和 MSFT JWT 处理程序都会自动返回包含错误代码/描述的 WWW-Authenticate 响应标头：

如果您认为标准行为不够方便，您可以使用事件模型手动处理挑战。例如：

services.AddAuthentication()
    .AddJwtBearer(options =>
    {
        options.Authority = "http://localhost:54540/";
        options.Audience = "resource_server";
        options.RequireHttpsMetadata = false;
        options.Events = new JwtBearerEvents();
        options.Events.OnChallenge = context =>
        {
            // Skip the default logic.
            context.HandleResponse();

            var payload = new JObject
            {
                ["error"] = context.Error,
                ["error_description"] = context.ErrorDescription,
                ["error_uri"] = context.ErrorUri
            };

            context.Response.ContentType = "application/json";
            context.Response.StatusCode = 401;

            return context.Response.WriteAsync(payload.ToString());
        };
    });

Answer 3

在发现与更新软件包后似乎出现的此异常相关的问题后，这对我有用。

System.InvalidOperationException: StatusCode cannot be set because the response has already started.
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ThrowResponseAlreadyStartedException(String value)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.set_StatusCode(Int32 value)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.Microsoft.AspNetCore.Http.Features.IHttpResponseFeature.set_StatusCode(Int32 value)
   at Microsoft.AspNetCore.Http.DefaultHttpResponse.set_StatusCode(Int32 value)

实现如下，

                OnAuthenticationFailed = context =>
                {
                    context.NoResult();
                    context.Response.StatusCode = StatusCodes.Status401Unauthorized;
                    context.Response.ContentType = "application/json";

                    string response =
                        JsonConvert.SerializeObject("The access token provided is not valid.");
                    if (context.Exception.GetType() == typeof(SecurityTokenExpiredException))
                    {
                        context.Response.Headers.Add("Token-Expired", "true");
                        response =
                            JsonConvert.SerializeObject("The access token provided has expired.");
                    }

                    context.Response.WriteAsync(response);
                    return Task.CompletedTask;
                },
                OnChallenge = context =>
                {
                    context.HandleResponse();
                    return Task.CompletedTask;
                }

Answer 4

请查看 .net core 2.1 的波纹管代码

OnAuthenticationFailed =context =>
                {
                    context.Response.OnStarting(async () =>
                    {
                        context.NoResult();
                        context.Response.Headers.Add("Token-Expired", "true");
                        context.Response.ContentType = "text/plain";
                        context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
                        await context.Response.WriteAsync("Un-Authorized");
                    });

                    return Task.CompletedTask;                        
                },