From ffd28be90ab85206474739b1f479ef49a6f0d7c3 Mon Sep 17 00:00:00 2001
From: Alexander Stecher <45872305+AlliBalliBaba@users.noreply.github.com>
Date: Fri, 30 Aug 2024 16:46:51 +0200
Subject: [PATCH] rewrite: Only serialize request if necessary (#6541)

* Prevents serializing the caddy request if log level is not debug.

* Extracts message to const.
---
 modules/caddyhttp/rewrite/rewrite.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/modules/caddyhttp/rewrite/rewrite.go b/modules/caddyhttp/rewrite/rewrite.go
index 9a4995186..c45ad98a2 100644
--- a/modules/caddyhttp/rewrite/rewrite.go
+++ b/modules/caddyhttp/rewrite/rewrite.go
@@ -131,6 +131,12 @@ func (rewr *Rewrite) Provision(ctx caddy.Context) error {
 
 func (rewr Rewrite) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
 	repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
+	const message = "rewrote request"
+
+	if rewr.logger.Check(zap.DebugLevel, message) == nil {
+		rewr.Rewrite(r, repl)
+		return next.ServeHTTP(w, r)
+	}
 
 	logger := rewr.logger.With(
 		zap.Object("request", caddyhttp.LoggableHTTPRequest{Request: r}),
@@ -139,7 +145,7 @@ func (rewr Rewrite) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddy
 	changed := rewr.Rewrite(r, repl)
 
 	if changed {
-		logger.Debug("rewrote request",
+		logger.Debug(message,
 			zap.String("method", r.Method),
 			zap.String("uri", r.RequestURI),
 		)