// Copyright 2019 Sorint.lab
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
// See the License for the specific language governing permissions and
// limitations under the License.

package handlers

import "net/http"

type maxBytesHandler struct {
	h http.Handler
	n int64
}

func NewMaxBytesHandler(n int64) func(http.Handler) http.Handler {
	return func(h http.Handler) http.Handler {
		return &maxBytesHandler{
			h: h,
			n: n,
		}
	}
}

func (h *maxBytesHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	if r.ContentLength > h.n {
		http.Error(w, "request too large", http.StatusExpectationFailed)
		return
	}
	r.Body = http.MaxBytesReader(w, r.Body, h.n)
	h.h.ServeHTTP(w, r)
}
