From e3125816430b582475511bc7afcc42022c998750 Mon Sep 17 00:00:00 2001
From: SpamNeko <spamneko@users.noreply.github.com>
Date: Tue, 9 May 2017 23:17:25 +0100
Subject: [PATCH] wrapHandler for http.Handler to redirect to 404 handler

---
 router/router.go      | 18 ++++++++--------
 router/wrapHandler.go | 49 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 9 deletions(-)
 create mode 100644 router/wrapHandler.go

diff --git a/router/router.go b/router/router.go
index 7aa7fe7ee..998c2a0ba 100644
--- a/router/router.go
+++ b/router/router.go
@@ -56,21 +56,21 @@ func init() {
 	Router = mux.NewRouter()
 
 	// Routes
-	http.Handle("/css/", http.StripPrefix("/css/", gzipCSSHandler))
-	http.Handle("/js/", http.StripPrefix("/js/", gzipJSHandler))
-	http.Handle("/img/", http.StripPrefix("/img/", imgHandler))
+	http.Handle("/css/", http.StripPrefix("/css/", wrapHandler(gzipCSSHandler)))
+	http.Handle("/js/", http.StripPrefix("/js/", wrapHandler(gzipJSHandler)))
+	http.Handle("/img/", http.StripPrefix("/img/", wrapHandler(imgHandler)))
 	Router.Handle("/", gzipHomeHandler).Name("home")
-	Router.Handle("/page/{page:[0-9]+}", gzipHomeHandler).Name("home_page")
+	Router.Handle("/page/{page:[0-9]+}", wrapHandler(gzipHomeHandler)).Name("home_page")
 	Router.Handle("/search", gzipSearchHandler).Name("search")
 	Router.Handle("/search/{page}", gzipSearchHandler).Name("search_page")
 	Router.Handle("/api", gzipAPIHandler).Methods("GET")
-	Router.Handle("/api/{page:[0-9]*}", gzipAPIHandler).Methods("GET")
-	Router.Handle("/api/view/{id}", gzipAPIViewHandler).Methods("GET")
+	Router.Handle("/api/{page:[0-9]*}", wrapHandler(gzipAPIHandler)).Methods("GET")
+	Router.Handle("/api/view/{id}", wrapHandler(gzipAPIViewHandler)).Methods("GET")
 	Router.Handle("/api/upload", gzipAPIUploadHandler).Methods("POST")
 	Router.Handle("/api/update", gzipAPIUpdateHandler).Methods("PUT")
 	Router.Handle("/faq", gzipFaqHandler).Name("faq")
 	Router.Handle("/feed", gzipRSSHandler).Name("feed")
-	Router.Handle("/view/{id}", gzipViewHandler).Methods("GET").Name("view_torrent")
+	Router.Handle("/view/{id}", wrapHandler(gzipViewHandler)).Methods("GET").Name("view_torrent")
 	Router.HandleFunc("/view/{id}", PostCommentHandler).Methods("POST").Name("post_comment")
 	Router.Handle("/upload", gzipUploadHandler).Name("upload")
 	Router.Handle("/user/register", gzipUserRegisterFormHandler).Name("user_register").Methods("GET")
@@ -79,9 +79,9 @@ func init() {
 	Router.Handle("/user/register", gzipUserRegisterPostHandler).Name("user_register").Methods("POST")
 	Router.Handle("/user/login", gzipUserLoginPostHandler).Name("user_login").Methods("POST")
 	Router.Handle("/user/logout", gzipUserLogoutHandler).Name("user_logout")
-	Router.Handle("/user/{id}/{username}", gzipUserProfileHandler).Name("user_profile").Methods("GET")
+	Router.Handle("/user/{id}/{username}", wrapHandler(gzipUserProfileHandler)).Name("user_profile").Methods("GET")
 	Router.Handle("/user/{id}/{username}/follow", gzipUserFollowHandler).Name("user_follow").Methods("GET")
-	Router.Handle("/user/{id}/{username}", gzipUserProfileFormHandler).Name("user_profile").Methods("POST")
+	Router.Handle("/user/{id}/{username}", wrapHandler(gzipUserProfileFormHandler)).Name("user_profile").Methods("POST")
 
 	Router.Handle("/mod/", gzipIndexModPanel).Name("mod_index")
 	Router.Handle("/mod/torrents", gzipTorrentsListPanel).Name("mod_tlist")
diff --git a/router/wrapHandler.go b/router/wrapHandler.go
new file mode 100644
index 000000000..d0170f44e
--- /dev/null
+++ b/router/wrapHandler.go
@@ -0,0 +1,49 @@
+package router
+
+import (
+	"net/http"
+)
+
+type wrappedResponseWriter struct {
+	Rw http.ResponseWriter
+	Ignore bool
+}
+
+func (wrw *wrappedResponseWriter) WriteHeader(status int) {
+	if status==404 {
+		wrw.Ignore=true
+	} else {
+		wrw.Rw.WriteHeader(status)
+	}
+}
+
+func (wrw *wrappedResponseWriter) Write(p []byte) (int, error) {
+	if wrw.Ignore {
+		return 0, nil
+	}
+	return wrw.Rw.Write(p)
+}
+
+func (wrw *wrappedResponseWriter) Header() http.Header {
+	return wrw.Rw.Header()
+}
+
+
+type wrappedHandler struct {
+	h http.Handler
+}
+
+func (wh *wrappedHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	wrw := wrappedResponseWriter{w, false}
+	wh.h.ServeHTTP(&wrw, r)
+	if wrw.Ignore==true {
+		wrw.Rw.Header().Del("Content-Encoding")
+		wrw.Rw.Header().Del("Vary")
+		wrw.Rw.Header().Set("Content-Type", "text/html; charset=utf-8")
+		NotFoundHandler(wrw.Rw, r)
+	}
+}
+
+func wrapHandler(handler http.Handler) http.Handler {
+	return &wrappedHandler{handler}
+}
\ No newline at end of file