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miniflux/http/request/client_ip.go

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// Copyright 2018 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package request // import "miniflux.app/http/request"
import (
"net"
"net/http"
"strings"
)
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func dropIPv6zone(address string) string {
i := strings.IndexByte(address, '%')
if i != -1 {
address = address[:i]
}
return address
}
// FindClientIP returns client real IP address.
func FindClientIP(r *http.Request) string {
headers := []string{"X-Forwarded-For", "X-Real-Ip"}
for _, header := range headers {
value := r.Header.Get(header)
if value != "" {
addresses := strings.Split(value, ",")
address := strings.TrimSpace(addresses[0])
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address = dropIPv6zone(address)
if net.ParseIP(address) != nil {
return address
}
}
}
// Fallback to TCP/IP source IP address.
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remoteIP, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
remoteIP = r.RemoteAddr
}
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remoteIP = dropIPv6zone(remoteIP)
// When listening on a Unix socket, RemoteAddr is empty.
if remoteIP == "" {
remoteIP = "127.0.0.1"
}
return remoteIP
}