修复代理到自身的循环问题

FastGithub.Configuration/LocalMachine.cs

@@ -1,5 +1,4 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 using System.Net.NetworkInformation;
 using System.Net.Sockets;
@@ -10,12 +9,7 @@ namespace FastGithub.Configuration
     /// 提供本机设备信息
     /// </summary>
     public static class LocalMachine
-    {
-        /// <summary>
-        /// 获取设备名
-        /// </summary>
-        public static string Name => Environment.MachineName;
-
+    { 
         /// <summary>
         /// 获取可用的随机Tcp端口
         /// </summary>

FastGithub.HttpServer/CertService.cs

@@ -181,7 +181,7 @@ namespace FastGithub.HttpServer
                 yield break;
             }
 
-            yield return LocalMachine.Name;
+            yield return Environment.MachineName;
             yield return IPAddress.Loopback.ToString();
         }
     }

FastGithub.HttpServer/HttpProxyMiddleware.cs

@@ -3,6 +3,7 @@ using FastGithub.DomainResolve;
 using Microsoft.AspNetCore.Connections.Features;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Features;
+using Microsoft.Extensions.Options;
 using System.IO.Pipelines;
 using System.Net;
 using System.Net.Http;
@@ -18,9 +19,13 @@ namespace FastGithub.HttpServer
     /// </summary>
     sealed class HttpProxyMiddleware
     {
+        private const string LOOPBACK = "127.0.0.1";
+        private const string LOCALHOST = "localhost";
+
         private readonly FastGithubConfig fastGithubConfig;
         private readonly IDomainResolver domainResolver;
         private readonly IHttpForwarder httpForwarder;
+        private readonly IOptions<FastGithubOptions> options;
         private readonly HttpMessageInvoker httpClient;
 
         /// <summary>
@@ -29,14 +34,17 @@ namespace FastGithub.HttpServer
         /// <param name="fastGithubConfig"></param>
         /// <param name="domainResolver"></param>
         /// <param name="httpForwarder"></param>
+        /// <param name="options"></param>
         public HttpProxyMiddleware(
             FastGithubConfig fastGithubConfig,
             IDomainResolver domainResolver,
-            IHttpForwarder httpForwarder)
+            IHttpForwarder httpForwarder,
+            IOptions<FastGithubOptions> options)
         {
             this.fastGithubConfig = fastGithubConfig;
             this.domainResolver = domainResolver;
             this.httpForwarder = httpForwarder;
+            this.options = options;
             this.httpClient = new HttpMessageInvoker(CreateHttpHandler(), disposeHandler: false);
         }
 
@@ -47,15 +55,17 @@ namespace FastGithub.HttpServer
         /// <returns></returns>
         public async Task InvokeAsync(HttpContext context)
         {
-            if (context.Request.Method == HttpMethods.Get && context.Request.Path == "/proxy.pac")
+            var host = context.Request.Host;
+            if (this.IsFastGithubServer(host) == true)
             {
+                var proxyPac = this.GetProxyPacString(host);
                 context.Response.ContentType = "application/x-ns-proxy-autoconfig";
-                var pacString = this.GetProxyPacString(context);
-                await context.Response.WriteAsync(pacString);
+                context.Response.Headers.Add("Content-Disposition", $"attachment;filename=proxy.pac");
+                await context.Response.WriteAsync(proxyPac);
             }
             else if (context.Request.Method == HttpMethods.Connect)
             {
-                var endpoint = await this.GetTargetEndPointAsync(context.Request);
+                var endpoint = await this.GetTargetEndPointAsync(host);
                 using var targetSocket = new Socket(SocketType.Stream, ProtocolType.Tcp);
                 await targetSocket.ConnectAsync(endpoint);
 
@@ -80,16 +90,30 @@ namespace FastGithub.HttpServer
         }
 
 
+        /// <summary>
+        /// 是否为fastgithub服务
+        /// </summary>
+        /// <param name="host"></param>
+        /// <returns></returns>
+        private bool IsFastGithubServer(HostString host)
+        {
+            if (host.Host == LOOPBACK || host.Host == LOCALHOST)
+            {
+                return host.Port == this.options.Value.HttpProxyPort;
+            }
+            return false;
+        }
+
         /// <summary>
         /// 获取proxypac脚本
         /// </summary>
-        /// <param name="context"></param>
+        /// <param name="host"></param>
         /// <returns></returns>
-        private string GetProxyPacString(HttpContext context)
+        private string GetProxyPacString(HostString host)
         {
             var buidler = new StringBuilder();
             buidler.AppendLine("function FindProxyForURL(url, host){");
-            buidler.AppendLine($"    var proxy = 'PROXY {context.Request.Host}';");
+            buidler.AppendLine($"    var proxy = 'PROXY {host.Host}';");
             foreach (var domain in this.fastGithubConfig.GetDomainPatterns())
             {
                 buidler.AppendLine($"    if (shExpMatch(host, '{domain}')) return proxy;");
@@ -102,13 +126,13 @@ namespace FastGithub.HttpServer
         /// <summary>
         /// 获取目标终节点
         /// </summary>
-        /// <param name="request"></param>
+        /// <param name="host"></param>
         /// <returns></returns>
-        private async Task<EndPoint> GetTargetEndPointAsync(HttpRequest request)
+        private async Task<EndPoint> GetTargetEndPointAsync(HostString host)
         {
             const int HTTPS_PORT = 443;
-            var targetHost = request.Host.Host;
-            var targetPort = request.Host.Port ?? HTTPS_PORT;
+            var targetHost = host.Host;
+            var targetPort = host.Port ?? HTTPS_PORT;
 
             if (IPAddress.TryParse(targetHost, out var address) == true)
             {

FastGithub/AppHostedService.cs

@@ -62,7 +62,7 @@ namespace FastGithub
                 await Task.Delay(TimeSpan.FromSeconds(1d), stoppingToken);
                 if (await this.UseFastGithubProxyAsync() == false)
                 {
-                    this.logger.LogWarning($"请手工设置系统http/https代理为127.0.0.1:38457或自动代理为http://127.0.0.1:38457/proxy.pac");
+                    this.logger.LogWarning($"请手工设置系统http/https代理为127.0.0.1:38457或自动代理为http://127.0.0.1:38457");
                 }
             }
         }

README.html

@@ -380,13 +380,13 @@ code {
 <ul>
 <li>执行<code>sudo ./fastgithub</code></li>
 <li>手工安装cacert/fastgithub.cer到受信任的根证书颁发机构</li>
-<li>手工设置系统http/https代理为<code>127.0.0.1:38457</code>或自动代理为<code>http://127.0.0.1:38457/proxy.pac</code></li>
+<li>手工设置系统http/https代理为<code>127.0.0.1:38457</code>或自动代理为<code>http://127.0.0.1:38457</code></li>
 </ul>
 <h4 id="23-macos-x64">2.3 macOS-x64</h4>
 <ul>
 <li>双击运行fastgithub程序</li>
 <li>手工安装cacert/fastgithub.cer并设置信任</li>
-<li>手工设置系统http/https代理为<code>127.0.0.1:38457</code>或自动代理为<code>http://127.0.0.1:38457/proxy.pac</code></li>
+<li>手工设置系统http/https代理为<code>127.0.0.1:38457</code>或自动代理为<code>http://127.0.0.1:38457</code></li>
 </ul>
 <h3 id="3-%E8%AF%81%E4%B9%A6%E9%AA%8C%E8%AF%81">3 证书验证</h3>
 <h4 id="31-git">3.1 git</h4>

README.md

@@ -13,12 +13,12 @@ github加速神器，解决github打不开、用户头像无法加载、releases
 #### 2.2 linux-x64
 * 执行`sudo ./fastgithub`
 * 手工安装cacert/fastgithub.cer到受信任的根证书颁发机构
-* 手工设置系统http/https代理为`127.0.0.1:38457`或自动代理为`http://127.0.0.1:38457/proxy.pac`
+* 手工设置系统http/https代理为`127.0.0.1:38457`或自动代理为`http://127.0.0.1:38457`
 
 #### 2.3 macOS-x64
 * 双击运行fastgithub程序
 * 手工安装cacert/fastgithub.cer并设置信任
-* 手工设置系统http/https代理为`127.0.0.1:38457`或自动代理为`http://127.0.0.1:38457/proxy.pac`
+* 手工设置系统http/https代理为`127.0.0.1:38457`或自动代理为`http://127.0.0.1:38457`
 
   
 ### 3 证书验证