feat(plugin): 添加插件抽象层项目 Fengling.Gateway.Plugin.Abstractions

- 创建插件接口定义 (IGatewayPlugin, IRequestPlugin, IResponsePlugin, IRouteTransformPlugin, ILoadBalancePlugin)
- 添加 YARP 引用用于类型定义

YarpGateway.slnx

@@ -5,6 +5,9 @@
   </Folder>
   <Folder Name="/src/">
     <Project Path="src/YarpGateway.csproj" />
+    <Project Path="src/Fengling.Gateway.Plugin.Abstractions/Fengling.Gateway.Plugin.Abstractions.csproj" />
+  </Folder>
+    <Project Path="src/YarpGateway.csproj" />
   </Folder>
   <Folder Name="/tests/">
     <Project Path="tests/YarpGateway.Tests/YarpGateway.Tests.csproj" />

src/Directory.Packages.props

@@ -12,6 +12,10 @@
     <PackageVersion Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore" Version="10.0.2" />
+    <PackageVersion Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.2" />
+    <PackageVersion Include="Microsoft.AspNetCore.Http.Abstractions" Version="10.0.0" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore.Design" Version="10.0.2" />
+    <PackageVersion Include="Microsoft.EntityFrameworkCore" Version="10.0.2" />
     
     <!-- Database -->
     <PackageVersion Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="10.0.0" />

src/Fengling.Gateway.Plugin.Abstractions/Fengling.Gateway.Plugin.Abstractions.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <RootNamespace>Fengling.Gateway.Plugin.Abstractions</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Yarp.ReverseProxy" />
+  </ItemGroup>
+
+</Project>

src/Fengling.Gateway.Plugin.Abstractions/IGatewayPlugin.cs

@@ -0,0 +1,63 @@
+using Microsoft.AspNetCore.Http;
+using Yarp.ReverseProxy.Configuration;
+using Yarp.ReverseProxy.Model;
+
+namespace Fengling.Gateway.Plugin.Abstractions;
+
+/// <summary>
+/// 插件基础接口
+/// </summary>
+public interface IGatewayPlugin
+{
+    string Name { get; }
+    string Version { get; }
+    string? Description { get; }
+
+    Task OnLoadAsync();
+    Task OnUnloadAsync();
+}
+
+/// <summary>
+/// 请求处理插件
+/// </summary>
+public interface IRequestPlugin : IGatewayPlugin
+{
+    /// <summary>请求到达网关前</summary>
+    Task<HttpContext?> OnRequestAsync(HttpContext context);
+
+    /// <summary>路由决策后</summary>
+    Task<HttpContext?> OnRouteMatchedAsync(HttpContext context, RouteConfig route);
+
+    /// <summary>转发到后端前</summary>
+    Task<HttpContext?> OnForwardingAsync(HttpContext context, HttpRequestMessage request);
+}
+
+/// <summary>
+/// 响应处理插件
+/// </summary>
+public interface IResponsePlugin : IGatewayPlugin
+{
+    /// <summary>后端响应后</summary>
+    Task OnBackendResponseAsync(HttpContext context, HttpResponseMessage response);
+
+    /// <summary>返回客户端前</summary>
+    Task OnResponseFinalizingAsync(HttpContext context);
+}
+
+/// <summary>
+/// 路由转换插件
+/// </summary>
+public interface IRouteTransformPlugin : IGatewayPlugin
+{
+    Task<RouteConfig> TransformRouteAsync(RouteConfig original, HttpContext context);
+}
+
+/// <summary>
+/// 负载均衡插件
+/// </summary>
+public interface ILoadBalancePlugin : IGatewayPlugin
+{
+    Task<DestinationState> SelectDestinationAsync(
+        IReadOnlyList<DestinationState> destinations,
+        HttpContext context);
+}