[游戏开发]ASP.NET Core Middleware 中间件

ASP.NET Core 中间件
ASP.NET Core 的客户端 IP 安全列表

中间件是一种装配到应用管道以处理请求和响应的软件。 每个组件：

• 选择是否将请求传递到管道中的下一个组件。
• 可在管道中的下一个组件前后执行工作。

请求委托用于生成请求管道。 请求委托处理每个 HTTP 请求。

1、Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Web
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();

            services.AddDbContext<SqlDbContext>(options =>
                 options.UseSqlServer(Configuration.GetConnectionString("SqlConnection")));
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseStaticFiles();

            app.UseRouting();

            #region 中间件
            app.UseMiddleware<AdminSafeListMiddleware>(Configuration["AdminSafeList"]);
            app.UseMiddleware<DueDateMiddleware>();
            #endregion

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
        }
    }
}

2、DueDateMiddleware.cs

using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;
using System;
using System.Net;
using System.Threading.Tasks;

namespace WebApi
{
    public class DueDateMiddleware
    {
        private readonly RequestDelegate _next;

        public DueDateMiddleware(RequestDelegate next)
        {
            _next = next;
        }

        public async Task InvokeAsync(HttpContext context)
        {
            DateTime dueDate = new DateTime(2024, 3, 25);
            DateTime currentDate = GetDate("http://www.baidu.com", dueDate);

            if (dueDate < currentDate)
            {
                context.Response.ContentType = "application/json;charset=utf-8";
                await context.Response.WriteAsync(JsonConvert.SerializeObject(new
                {
                    code = 401,
                    message = "使用期限已到，请联系管理员"
                }));
            }
            else
            {
                await _next(context);
            }
        }

        public DateTime GetDate(string url, DateTime dueDate)
        {
            DateTime dt = dueDate.AddDays(10);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse response = null;
            try
            {
                response = (HttpWebResponse)request.GetResponse();
                var lastModified = response.LastModified;
                dt = Convert.ToDateTime(lastModified);
            }
            catch (WebException e)
            {
                response = (HttpWebResponse)e.Response;
            }
            finally
            {
                if (response != null)
                {
                    response.Close();
                }
                if (request != null)
                {
                    request.Abort();
                }
            }
            return dt;
        }
    }
}

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