实现UA名单功能

internal/nodes/http_request_user_agent.go

@@ -0,0 +1,24 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package nodes
+
+import (
+	"net/http"
+)
+
+func (this *HTTPRequest) doCheckUserAgent() (shouldStop bool) {
+	if this.web.UserAgent == nil {
+		return
+	}
+
+	const cacheSeconds = "3600" // 时间不能过长，防止修改设置后长期无法生效
+
+	if !this.web.UserAgent.AllowRequest(this.RawReq) {
+		this.tags = append(this.tags, "userAgentCheck")
+		this.writer.Header().Set("Cache-Control", "max-age="+cacheSeconds)
+		this.writeCode(http.StatusForbidden, "The User-Agent has been blocked.", "当前访问已被UA名单拦截。")
+		return true
+	}
+
+	return
+}