ip.go


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// SPDX-License-Identifier: BSD-2-Clause
// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>

package main

import (
	"net/http"
	"strings"
)

// getRemoteIP returns the remote IP address of the client. It respects
// X-Forwarded-For if powxy is configured as a secondary proxy. Ports
// are stripped.
func getRemoteIP(request *http.Request) (remoteIP string) {
	if secondary {
		remoteIP, _, _ = strings.Cut(request.Header.Get("X-Forwarded-For"), ",")
	}
	if remoteIP == "" {
		remoteIP = request.RemoteAddr
		index := strings.LastIndex(remoteIP, ":")
		if index != -1 {
			remoteIP = remoteIP[:index]
		}
	}
	return
}