From 77dc35fbd65db3001db7260e3b57fdb55739197a Mon Sep 17 00:00:00 2001
From: Stephen J Day <stephen.day@docker.com>
Date: Thu, 12 Mar 2015 19:09:26 -0700
Subject: [PATCH] Validate prefix lookups for WithRequest/WithResponse contexts

Signed-off-by: Stephen J Day <stephen.day@docker.com>
---
 context/http.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/context/http.go b/context/http.go
index ab3a3744..357f0dc3 100644
--- a/context/http.go
+++ b/context/http.go
@@ -133,6 +133,10 @@ func (ctx *httpRequestContext) Value(key interface{}) interface{} {
 			return ctx.r
 		}
 
+		if !strings.HasPrefix(keyStr, "http.request.") {
+			goto fallback
+		}
+
 		parts := strings.Split(keyStr, ".")
 
 		if len(parts) != 3 {
@@ -241,6 +245,10 @@ func (irw *instrumentedResponseWriter) Value(key interface{}) interface{} {
 			return irw.ResponseWriter
 		}
 
+		if !strings.HasPrefix(keyStr, "http.response.") {
+			goto fallback
+		}
+
 		parts := strings.Split(keyStr, ".")
 
 		if len(parts) != 3 {