Log authentication attempts

auth.go

@@ -28,9 +28,13 @@ func authenticate(username, password string) bool {
 func handleAuthenticate(w http.ResponseWriter, req *http.Request) {
 	status := http.StatusForbidden
 
-	username, password, ok := req.BasicAuth()
-	if ok && authenticate(username, password) {
-		status = http.StatusOK
+	if username, password, ok := req.BasicAuth(); ok {
+		if authenticate(username, password) {
+			status = http.StatusOK
+			log.Printf("auth(%s) -> ok", username)
+		} else {
+			log.Printf("auth(%s) -> ERROR", username)
+		}
 	}
 
 	w.WriteHeader(status)