From dfb6142ccef789e0c129b7eb0ea0483ffd4b7a32 Mon Sep 17 00:00:00 2001
From: Steve <hez2010@outlook.com>
Date: Mon, 6 Nov 2023 16:01:02 +0900
Subject: [PATCH] feat: expose Kestrel options in appsettings.json (#174)

---
 docs/pages/config/appsettings.zh.mdx | 26 ++++++++++++++++++++++++++
 src/GZCTF/Program.cs                 |  7 +++++++
 2 files changed, 33 insertions(+)

diff --git a/docs/pages/config/appsettings.zh.mdx b/docs/pages/config/appsettings.zh.mdx
index 846f81a9c..c4fb2b4e2 100644
--- a/docs/pages/config/appsettings.zh.mdx
+++ b/docs/pages/config/appsettings.zh.mdx
@@ -88,6 +88,26 @@ import { Callout } from "nextra-theme-docs";
     // use the following options to allow proxy
     "TrustedNetworks": ["10.0.0.0/8"],
     "TrustedProxies": ["10.0.0.1"]
+  },
+  "Kestrel": {
+    "Limits": {
+      "MaxResponseBufferSize": 2048,
+      "MaxRequestBufferSize": 1048576,
+      "MaxRequestLineSize": 8192,
+      "MaxRequestHeadersTotalSize": 32768,
+      "MaxRequestHeaderCount": 100,
+      "MaxRequestBodySize": 27262946,
+      "KeepAliveTimeout": "0.0:5:0",
+      "RequestHeadersTimeout": "0.0:5:0",
+      "MaxConcurrentConnections": null,
+      "MaxConcurrentUpgradedConnections": null
+    },
+    "AddServerHeader": true,
+    "AllowResponseHeaderCompression": true,
+    "AllowSynchronousIO": false,
+    "AllowAlternateSchemes": false,
+    "DisableStringReuse": false,
+    "ConfigurationLoader": null
   }
 }
 ```
@@ -220,3 +240,9 @@ GZCTF 仅支持 PostgreSQL 作为数据库，不支持 MySQL 等其他数据库
 </Callout>
 
 其他字段请参考官方文档描述：[配置 ASP.NET Core 以使用代理服务器和负载均衡器](https://learn.microsoft.com/zh-cn/aspnet/core/host-and-deploy/proxy-load-balancer?view=aspnetcore-7.0) 及 [ForwardedHeadersOptions 类](https://learn.microsoft.com/zh-cn/dotnet/api/microsoft.aspnetcore.builder.forwardedheadersoptions?view=aspnetcore-7.0)
+
+### Kestrel
+
+Kestrel 为 GZCTF 自带并使用的 Web 服务器。利用此配置可以自行控制 Kestrel 的行为，例如指定 HTTP 协议、修改请求大小上限等等。
+
+具体可配置字段请参照官方文档中 `KestrelServerOptions` 类的属性: [KestrelServerOptions 类](https://learn.microsoft.com/zh-cn/dotnet/api/microsoft.aspnetcore.server.kestrel.core.kestrelserveroptions?view=aspnetcore-7.0)
diff --git a/src/GZCTF/Program.cs b/src/GZCTF/Program.cs
index dce9549c8..8c0037112 100644
--- a/src/GZCTF/Program.cs
+++ b/src/GZCTF/Program.cs
@@ -27,6 +27,13 @@
 
 WebApplicationBuilder builder = WebApplication.CreateBuilder(args);
 
+builder.WebHost.ConfigureKestrel(options =>
+{
+    var kestrelSection = builder.Configuration.GetSection("Kestrel");
+    options.Configure(kestrelSection);
+    kestrelSection.Bind(options);
+});
+
 Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
 
 GZCTF.Program.Banner();