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ip.go
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ip.go
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package utils
// https://github.com/yuwf/gobase
import (
"net"
"net/http"
"strings"
"sync"
"github.com/rs/zerolog/log"
)
// LocalIP ...
func LocalIP() (net.IP, error) {
addrs, err := net.InterfaceAddrs()
if err != nil {
return nil, err
}
// 优先取全局单播地址
for _, addr := range addrs {
if ipnet, ok := addr.(*net.IPNet); ok && ipnet.IP.IsGlobalUnicast() {
if ipnet.IP.To4() != nil || ipnet.IP.To16() != nil {
return ipnet.IP, nil
}
}
}
// 取回环地址
for _, addr := range addrs {
if ipnet, ok := addr.(*net.IPNet); ok && ipnet.IP.IsLoopback() {
if ipnet.IP.To4() != nil {
return ipnet.IP, nil
}
}
}
return nil, nil
}
// LocalIPString ...
var getIpOnce sync.Once
var localIp string
func LocalIPString() string {
getIpOnce.Do(func() {
ip, err := LocalIP()
if err != nil {
log.Error().Msgf("LocalIPString error:%v", err)
return
}
if ip == nil {
log.Error().Msg("LocalIPString empty")
}
localIp = ip.String()
})
return localIp
}
var remoteIPHeaders = []string{"True-Client-IP", "X-Forwarded-For", "X-Real-IP"}
func ClientIPHeader(header http.Header) *net.IPAddr {
for _, name := range remoteIPHeaders {
if value := header.Get(name); value != "" {
ipStr := strings.TrimSpace(strings.Split(value, ",")[0])
if ip, err := net.ResolveIPAddr("ip", ipStr); err == nil {
return ip
}
}
}
return nil
}
func ClientTCPIPHeader(header http.Header) *net.TCPAddr {
for _, name := range remoteIPHeaders {
if value := header.Get(name); value != "" {
ipStr := strings.TrimSpace(strings.Split(value, ",")[0])
if ip, err := net.ResolveTCPAddr("tcp", ipStr); err == nil {
return ip
}
}
}
return nil
}
func ClientIPRequest(req *http.Request) *net.IPAddr {
for _, name := range remoteIPHeaders {
if value := req.Header.Get(name); value != "" {
ipStr := strings.TrimSpace(strings.Split(value, ",")[0])
if ip, err := net.ResolveIPAddr("ip", ipStr); err == nil {
return ip
}
}
}
if ipStr, _, err := net.SplitHostPort(strings.TrimSpace(req.RemoteAddr)); err == nil {
if ip, err := net.ResolveIPAddr("ip", ipStr); err == nil {
return ip
}
}
return nil
}
func ParseIP(addr net.Addr) string {
ip := strings.Split(addr.String(), ":")[0]
return ip
}