refactor

ngin/handler/maxbyteshandler.go

@@ -0,0 +1,27 @@
+package handler
+
+import (
+	"net/http"
+
+	"zero/ngin/internal"
+)
+
+func MaxBytesHandler(n int64) func(http.Handler) http.Handler {
+	if n <= 0 {
+		return func(next http.Handler) http.Handler {
+			return next
+		}
+	}
+
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			if r.ContentLength > n {
+				internal.Errorf(r, "request entity too large, limit is %d, but got %d, rejected with code %d",
+					n, r.ContentLength, http.StatusRequestEntityTooLarge)
+				w.WriteHeader(http.StatusRequestEntityTooLarge)
+			} else {
+				next.ServeHTTP(w, r)
+			}
+		})
+	}
+}