// Copyright 2023 The casbin Authors. All Rights Reserved.
//
// 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 util

import (
	"net"
	"net/http"
	"strings"
)

func GetClientIp(r *http.Request) string {
	forwarded := r.Header.Get("X-Forwarded-For")
	if forwarded != "" {
		clientIP := strings.Split(forwarded, ",")[0]
		return strings.TrimSpace(clientIP)
	}

	realIP := r.Header.Get("X-Real-IP")
	if realIP != "" {
		return realIP
	}

	ip, _, err := net.SplitHostPort(r.RemoteAddr)
	if err != nil {
		return r.RemoteAddr
	}
	return ip
}