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// Copyright (c) 2014-2019 Ludovic Fauvet
// Licensed under the MIT license
package network
import (
"net"
"strings"
)
// LookupMirrorIP returns the IP address of a mirror and returns an error
// if the DNS has more than one address
func LookupMirrorIP(host string) (string, error) {
addrs, err := net.LookupIP(host)
if err != nil {
return "", err
}
// A mirror with multiple IP address is a problem
// since we can't determine the exact position of
// the server.
if len(addrs) > 1 {
err = ErrMultipleAddresses
}
return addrs[0].String(), err
}
// RemoteIPFromAddr removes the port from a remote address (x.x.x.x:yyyy)
func RemoteIPFromAddr(remoteAddr string) string {
return remoteAddr[:strings.LastIndex(remoteAddr, ":")]
}
// ExtractRemoteIP extracts the remote IP from an X-Forwarded-For header
func ExtractRemoteIP(XForwardedFor string) string {
addresses := strings.Split(XForwardedFor, ",")
if len(addresses) > 0 {
// The left-most address is supposed to be the original client address.
// Each successive are added by proxies. In most cases we should probably
// take the last address but in case of optimization services this will
// probably not work. For now we'll always take the original one.
return strings.TrimSpace(addresses[0])
}
return ""
}
// IsPrimaryCountry returns true if the clientInfo country is the primary country
func IsPrimaryCountry(clientInfo GeoIPRecord, list []string) bool {
if !clientInfo.IsValid() {
return false
}
if len(list) > 0 && list[0] == clientInfo.CountryCode {
return true
}
return false
}
// IsAdditionalCountry returns true if the clientInfo country is in list
func IsAdditionalCountry(clientInfo GeoIPRecord, list []string) bool {
if !clientInfo.IsValid() {
return false
}
for i, b := range list {
if i > 0 && b == clientInfo.CountryCode {
return true
}
}
return false
}
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