80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
package main
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import (
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"io"
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"net"
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"fmt"
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"time"
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"net/http"
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"strings"
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"context"
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)
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type ProxyHandler struct {
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timeout time.Duration
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logger *CondLogger
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httptransport http.RoundTripper
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}
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func NewProxyHandler(timeout time.Duration, logger *CondLogger) *ProxyHandler {
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httptransport := &http.Transport{}
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return &ProxyHandler{
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timeout: timeout,
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logger: logger,
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httptransport: httptransport,
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}
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}
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func (s *ProxyHandler) HandleTunnel(wr http.ResponseWriter, req *http.Request) {
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ctx, _ := context.WithTimeout(req.Context(), s.timeout)
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dialer := net.Dialer{}
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conn, err := dialer.DialContext(ctx, "tcp", req.RequestURI)
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if err != nil {
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s.logger.Error("Can't satisfy CONNECT request: %v", err)
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http.Error(wr, "Can't satisfy CONNECT request", http.StatusBadGateway)
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return
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}
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defer conn.Close()
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// Upgrade client connection
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localconn, _, err := hijack(wr)
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if err != nil {
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s.logger.Error("Can't hijack client connection: %v", err)
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http.Error(wr, "Can't hijack client connection", http.StatusInternalServerError)
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return
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}
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defer localconn.Close()
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// Inform client connection is built
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fmt.Fprintf(localconn, "HTTP/%d.%d 200 OK\r\n\r\n", req.ProtoMajor, req.ProtoMinor)
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proxy(req.Context(), localconn, conn)
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}
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func (s *ProxyHandler) HandleRequest(wr http.ResponseWriter, req *http.Request) {
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req.RequestURI = ""
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resp, err := s.httptransport.RoundTrip(req)
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if err != nil {
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s.logger.Error("HTTP fetch error: %v", err)
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http.Error(wr, "Server Error", http.StatusInternalServerError)
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return
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}
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defer resp.Body.Close()
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s.logger.Info("%v %v %v %v", req.RemoteAddr, req.Method, req.URL, resp.Status)
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delHopHeaders(resp.Header)
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copyHeader(wr.Header(), resp.Header)
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wr.WriteHeader(resp.StatusCode)
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io.Copy(wr, resp.Body)
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}
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func (s *ProxyHandler) ServeHTTP(wr http.ResponseWriter, req *http.Request) {
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s.logger.Info("Request: %v %v %v", req.RemoteAddr, req.Method, req.URL)
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delHopHeaders(req.Header)
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if strings.ToUpper(req.Method) == "CONNECT" {
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s.HandleTunnel(wr, req)
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} else {
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s.HandleRequest(wr, req)
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}
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}
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