add gzip support

server/gzip/gzip.go

@@ -0,0 +1,37 @@
+package gzip
+
+import (
+	"compress/gzip"
+	"net/http"
+	"strings"
+)
+
+type gzipResponseWriter struct {
+	Writer         *gzip.Writer
+	ResponseWriter http.ResponseWriter
+}
+
+func (gz gzipResponseWriter) Header() http.Header {
+	return gz.ResponseWriter.Header()
+}
+
+func (gz gzipResponseWriter) Write(b []byte) (int, error) {
+	return gz.Writer.Write(b)
+}
+
+func (gz gzipResponseWriter) WriteHeader(statusCode int) {
+	gz.ResponseWriter.WriteHeader(statusCode)
+}
+
+func SetupCompression(handler http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
+			handler(w, r)
+			return
+		}
+		w.Header().Set("Content-Encoding", "gzip")
+		gz := gzip.NewWriter(w)
+		defer gz.Close()
+		handler(gzipResponseWriter{Writer: gz, ResponseWriter: w}, r)
+	}
+}

server/setup.go

@@ -9,11 +9,6 @@ import (
 	"codeberg.org/codeberg/pages/server/utils"
 )
 
-func SetupServer(handler http.HandlerFunc) http.HandlerFunc {
-	// TODO: enagle gzip compression
-	return handler
-}
-
 func SetupHTTPACMEChallengeServer(challengeCache cache.SetGetKey) http.HandlerFunc {
 	challengePath := "/.well-known/acme-challenge/"