Improve websocket support

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Changes since v3.1.0
 
+- [#112](https://github.com/pusher/oauth2_proxy/pull/112) Improve websocket support (@gyson)
 - [#63](https://github.com/pusher/oauth2_proxy/pull/63) Use encoding/json for SessionState serialization (@yaegashi)
   - Use JSON to encode session state to be stored in browser cookies
   - Implement legacy decode function to support existing cookies generated by older versions

logging_handler.go

@@ -4,6 +4,8 @@
 package main
 
 import (
+	"bufio"
+	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -32,6 +34,14 @@ func (l *responseLogger) Header() http.Header {
 	return l.w.Header()
 }
 
+// Support Websocket
+func (l *responseLogger) Hijack() (rwc net.Conn, buf *bufio.ReadWriter, err error) {
+	if hj, ok := l.w.(http.Hijacker); ok {
+		return hj.Hijack()
+	}
+	return nil, nil, errors.New("http.Hijacker is not available on writer")
+}
+
 // ExtractGAPMetadata extracts and removes GAP headers from the ResponseWriter's
 // Header
 func (l *responseLogger) ExtractGAPMetadata() {

logging_handler_test.go

@@ -24,6 +24,11 @@ func TestLoggingHandler_ServeHTTP(t *testing.T) {
 	for _, test := range tests {
 		buf := bytes.NewBuffer(nil)
 		handler := func(w http.ResponseWriter, req *http.Request) {
+			_, ok := w.(http.Hijacker)
+			if !ok {
+				t.Error("http.Hijacker is not available")
+			}
+
 			w.Write([]byte("test"))
 		}
 

oauthproxy.go

@@ -110,7 +110,7 @@ func (u *UpstreamProxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		r.Header.Set("GAP-Auth", w.Header().Get("GAP-Auth"))
 		u.auth.SignRequest(r)
 	}
-	if u.wsHandler != nil && r.Header.Get("Connection") == "Upgrade" && r.Header.Get("Upgrade") == "websocket" {
+	if u.wsHandler != nil && strings.ToLower(r.Header.Get("Connection")) == "upgrade" && r.Header.Get("Upgrade") == "websocket" {
 		u.wsHandler.ServeHTTP(w, r)
 	} else {
 		u.handler.ServeHTTP(w, r)