Question

下面是我编写了一个中间件的代码片段，该中间件接收api请求并验证它并发送响应。

但是当请求在那时有效时它不会调用API，它会显示404 Not Found Error。

中间件代码段

    // You may need to install the Microsoft.AspNetCore.Http.Abstractions package into your project
public class ApiKeyValidatorsMiddleware
{
    private readonly RequestDelegate _next;
    IValidateRequest _IValidateRequest { get; set; }

    public ApiKeyValidatorsMiddleware(RequestDelegate next , IValidateRequest ivalidaterequest)
    {
        _next = next;
        _IValidateRequest = ivalidaterequest;
    }

    public async Task Invoke(HttpContext httpContext)
    {
        try
        {
            var queryString = httpContext.Request.Query;
            StringValues keyvalue;
            queryString.TryGetValue("key", out keyvalue);



            if (httpContext.Request.Method != "POST")
            {
                httpContext.Response.StatusCode = 405; //Method Not Allowed               
                await httpContext.Response.WriteAsync("Method Not Allowed");
                return;
            }

            if (keyvalue.Count == 0)
            {
                httpContext.Response.StatusCode = 400; //Bad Request                
                await httpContext.Response.WriteAsync("API Key is missing");
                return;
            }
            else
            {
                var serviceName = httpContext.Request.Path.Value.Replace(@"/", string.Empty);

                if (!_IValidateRequest.ValidateKeys(keyvalue) && !_IValidateRequest.IsValidServiceRequest(keyvalue, serviceName))
                {
                    httpContext.Response.StatusCode = 401; //UnAuthorized
                    await httpContext.Response.WriteAsync("Invalid User Key");
                    return;
                }
            }

            await _next.Invoke(httpContext);
        }
        catch (Exception)
        {
            throw;
        }
    }
}

// Extension method used to add the middleware to the HTTP request pipeline.
public static class MiddlewareExtensions
{
    public static IApplicationBuilder UseMiddleware(this IApplicationBuilder builder)
    {
        return builder.UseMiddleware<ApiKeyValidatorsMiddleware>();
    }
}

启动

 public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseBrowserLink();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
        }
        app.UseStaticFiles();
        app.UseSession();

        //Middleware Call
        app.Map("/api", appBuilder => appBuilder.UseMiddleware<ApiKeyValidatorsMiddleware>());

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "Servicedefault",
                template: "{controller=Login}/{action=Login}/{ServiceID}/{ServiceName}");

            routes.MapRoute(
                name: "default",
                template: "{controller=Login}/{action=Login}/{id?}");

        });
    }

Controller Codesnippet

这是一个简单的API，它没有任何身份验证属性。

    [Route("api/[controller]")]
public class MoviesAPIController : Controller
{
    IMovies _IMovies;
    public MoviesAPIController(IMovies imovies)
    {
        _IMovies = imovies;
    }

    // GET: api/values
    [HttpGet]
    public IEnumerable<string> Get()
    {
        return new string[] { "value1", "value2" };
    }

    // GET api/values/5
    [HttpGet("{id}")]
    public string Get(int id)
    {
        return "value";
    }

    // POST api/values
    [HttpPost]
    public List<MoviesTB> Post([FromQuery]string key)
    {
        return _IMovies.GetMusicStore();
    }

输出

Answer 1

根据documentation

Map *扩展用作分支管道的约定。映射基于给定请求路径的匹配来分支请求管道。如果请求路径以给定路径开始，则执行分支。

您需要像这样注册您的中间件

app.UseMiddleware<ApiKeyValidatorsMiddleware>();

然后在中间件中检查它是否是API调用。

httpContext.Request.Path.StartsWithSegments("/api")

MiddleWare代码

// You may need to install the Microsoft.AspNetCore.Http.Abstractions package into your project
    public class ApiKeyValidatorsMiddleware
    {
        private readonly RequestDelegate _next;
        IValidateRequest _IValidateRequest { get; set; }

        public ApiKeyValidatorsMiddleware(RequestDelegate next, IValidateRequest ivalidaterequest)
        {
            _next = next;
            _IValidateRequest = ivalidaterequest;
        }

        public async Task Invoke(HttpContext httpContext)
        {
            try
            {
                if (httpContext.Request.Path.StartsWithSegments("/api"))
                {

                    var queryString = httpContext.Request.Query;
                    StringValues keyvalue;
                    queryString.TryGetValue("key", out keyvalue);



                    if (httpContext.Request.Method != "POST")
                    {
                        httpContext.Response.StatusCode = 405; //Method Not Allowed               
                        await httpContext.Response.WriteAsync("Method Not Allowed");
                        return;
                    }

                    if (keyvalue.Count == 0)
                    {
                        httpContext.Response.StatusCode = 400; //Bad Request                
                        await httpContext.Response.WriteAsync("API Key is missing");
                        return;
                    }
                    else
                    {
                        var serviceName = httpContext.Request.Path.Value.Replace(@"/", string.Empty);

                        if (!_IValidateRequest.ValidateKeys(keyvalue) && !_IValidateRequest.IsValidServiceRequest(keyvalue, serviceName))
                        {
                            httpContext.Response.StatusCode = 401; //UnAuthorized
                            await httpContext.Response.WriteAsync("Invalid User Key");
                            return;
                        }
                    }

                }
                await _next.Invoke(httpContext);

            }
            catch (Exception)
            {
                throw;
            }
        }
    }

    // Extension method used to add the middleware to the HTTP request pipeline.
    public static class MiddlewareExtensions
    {
        public static IApplicationBuilder UseMiddleware(this IApplicationBuilder builder)
        {
            return builder.UseMiddleware<ApiKeyValidatorsMiddleware>();
        }
    }

404 not found使用带有.map的Asp.net核心中间件时获取响应

1 个答案: