Add middleware that also gzips html content

middleware.go

@@ -0,0 +1,58 @@
+package ersteller_lib
+
+import (
+	"compress/gzip"
+	"io"
+	"net/http"
+	"strings"
+)
+
+type gzipResponseWriter struct {
+	io.Writer
+	http.ResponseWriter
+}
+
+func (w gzipResponseWriter) Write(b []byte) (int, error) {
+	return w.Writer.Write(b)
+}
+
+// https://gist.github.com/the42/1956518
+func MakeGzipHandler(fn http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
+			fn.ServeHTTP(w, r)
+			return
+		}
+		w.Header().Set("Content-Encoding", "gzip")
+		gz := gzip.NewWriter(w)
+		defer gz.Close()
+		gzr := gzipResponseWriter{Writer: gz, ResponseWriter: w}
+		fn.ServeHTTP(gzr, r)
+	})
+}
+
+// https://www.jvt.me/posts/2023/09/01/golang-nethttp-global-middleware/
+func UseMiddleware(r *http.ServeMux, middlewares ...func(next http.Handler) http.Handler) http.Handler {
+	var s http.Handler
+	s = r
+
+	for _, mw := range middlewares {
+		s = mw(s)
+	}
+
+	return s
+}
+
+func LoggingMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		Debug("Path ", r.URL.String())
+		next.ServeHTTP(w, r)
+	})
+}
+
+func AcceptHeaderMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		Debug("Accept: %v", r.Header.Get("Accept"))
+		next.ServeHTTP(w, r)
+	})
+}