mirror of
https://github.com/woodchen-ink/proxy-go.git
synced 2025-07-18 08:31:55 +08:00
94 lines
2.4 KiB
Go
94 lines
2.4 KiB
Go
package middleware
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import (
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"io"
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"log"
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"net"
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"net/http"
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"strings"
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)
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type CDNJSConfig struct {
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Path string // 固定路径，例如 "/cdnjs"
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TargetHost string // 目标主机，例如 "cdnjs.cloudflare.com"
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TargetURL string // 目标URL，例如 "https://cdnjs.cloudflare.com"
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}
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// CDNJSMiddleware 处理固定路径的代理
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func CDNJSMiddleware(configs []CDNJSConfig) func(http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// 检查是否匹配任何固定路径
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for _, cfg := range configs {
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if strings.HasPrefix(r.URL.Path, cfg.Path) {
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// 创建新的请求
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targetPath := strings.TrimPrefix(r.URL.Path, cfg.Path)
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targetURL := cfg.TargetURL + targetPath
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proxyReq, err := http.NewRequest(r.Method, targetURL, r.Body)
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if err != nil {
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http.Error(w, "Error creating proxy request", http.StatusInternalServerError)
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return
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}
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// 复制原始请求的 header
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for key, values := range r.Header {
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for _, value := range values {
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proxyReq.Header.Add(key, value)
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}
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}
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// 设置必要的头部
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proxyReq.Host = cfg.TargetHost
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proxyReq.Header.Set("Host", cfg.TargetHost)
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proxyReq.Header.Set("X-Real-IP", getClientIP(r))
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proxyReq.Header.Set("X-Scheme", r.URL.Scheme)
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// 发送代理请求
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client := &http.Client{}
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resp, err := client.Do(proxyReq)
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if err != nil {
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http.Error(w, "Error forwarding request", http.StatusBadGateway)
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return
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}
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defer resp.Body.Close()
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// 复制响应头
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for key, values := range resp.Header {
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for _, value := range values {
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w.Header().Add(key, value)
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}
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}
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// 设置响应状态码
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w.WriteHeader(resp.StatusCode)
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// 复制响应体
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if _, err := io.Copy(w, resp.Body); err != nil {
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// 已经发送了响应头，只能记录错误
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log.Printf("Error copying response: %v", err)
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}
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return
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}
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}
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// 如果没有匹配的固定路径，继续下一个处理器
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next.ServeHTTP(w, r)
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})
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}
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}
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// getClientIP 获取客户端IP
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func getClientIP(r *http.Request) string {
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if ip := r.Header.Get("X-Real-IP"); ip != "" {
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return ip
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}
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if ip := r.Header.Get("X-Forwarded-For"); ip != "" {
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return strings.Split(ip, ",")[0]
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}
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if ip, _, err := net.SplitHostPort(r.RemoteAddr); err == nil {
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return ip
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}
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return r.RemoteAddr
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}
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