增加 dotnet 实现的一个 GitHub proxy

development/frontend/dotnet_proxy/.gitignore

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+## Ignore Visual Studio temporary files, build results, and
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development/frontend/dotnet_proxy/Dockerfile

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+FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
+# use forward headers
+ENV ASPNETCORE_FORWARDEDHEADERS_ENABLED=true
+LABEL Maintainer="WeihanLi"
+EXPOSE 80
+
+FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build-env
+WORKDIR /app
+
+
+COPY GithubProxySample.csproj ./
+RUN dotnet restore ./GithubProxySample.csproj
+
+COPY . .
+
+WORKDIR /app
+RUN dotnet publish -c Release -o out
+
+# build runtime image
+FROM base AS final
+WORKDIR /app
+COPY --from=build-env /app/out .
+ENTRYPOINT ["dotnet", "GithubProxySample.dll"]

development/frontend/dotnet_proxy/GithubProxySample.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Yarp.ReverseProxy" Version="1.1.1" />
+  </ItemGroup>
+
+</Project>

development/frontend/dotnet_proxy/Program.cs

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+using Yarp.ReverseProxy.Transforms;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddReverseProxy()
+    .LoadFromConfig(builder.Configuration.GetSection("ReverseProxy"))
+    .AddTransforms((context) =>
+    {
+        if (context.Route.ClusterId == "githubimages")
+        {
+            context.AddRequestTransform(transformContext =>
+            {
+                var path = transformContext.HttpContext.Request.Path.Value?.Replace("/blob/", "/") ?? "/";
+                var url = "https://raw.githubusercontent.com" + path + transformContext.HttpContext.Request.QueryString;
+                transformContext.ProxyRequest.RequestUri = new Uri(url);
+                return default;
+            });
+        }
+    });
+
+var app = builder.Build();
+app.MapReverseProxy();
+app.Run();

development/frontend/dotnet_proxy/README.md

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+# 基于 .NET 的反向代理实现
+
+## Intro
+
+基于 .NET 6 + Yarp 实现的一个简单的反向代理
+
+## 开发
+
+下载安装 .NET 6 SDK (<https://get.dot.net>)，安装好 SDK 以后，在这个目录下执行 `dotnet run` 就可以运行项目了
+
+## 部署
+
+可以使用已有的 docker 镜像进行部署
+
+``` sh
+docker run -d --name github-proxy-sample -d 9000:80 weihanli/github-proxy-sample
+```
+
+也可以自己 build 镜像部署
+
+``` sh
+# 打包镜像
+docker build -t github-proxy-sample .
+# 运行容器
+docker run -d --name github-proxy-sample -d 9000:80 github-proxy-sample
+```
+
+不使用 docker 也可以部署，可以参考文档：
+<https://docs.microsoft.com/zh-cn/aspnet/core/host-and-deploy/?view=aspnetcore-6.0>
+
+## Demo
+
+- <https://weneedhome.weihanli.xyz>
+
+## References
+
+- <https://dot.net>
+- <https://docs.microsoft.com/zh-cn/aspnet/core/host-and-deploy/?view=aspnetcore-6.0>