traefik/pkg/ip/strategy.go

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package ip
import (
"net/http"
"strings"
)
const (
xForwardedFor = "X-Forwarded-For"
)
// Strategy a strategy for IP selection
type Strategy interface {
GetIP(req *http.Request) string
}
// RemoteAddrStrategy a strategy that always return the remote address
type RemoteAddrStrategy struct{}
// GetIP return the selected IP
func (s *RemoteAddrStrategy) GetIP(req *http.Request) string {
return req.RemoteAddr
}
// DepthStrategy a strategy based on the depth inside the X-Forwarded-For from right to left
type DepthStrategy struct {
Depth int
}
// GetIP return the selected IP
func (s *DepthStrategy) GetIP(req *http.Request) string {
xff := req.Header.Get(xForwardedFor)
xffs := strings.Split(xff, ",")
if len(xffs) < s.Depth {
return ""
}
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return strings.TrimSpace(xffs[len(xffs)-s.Depth])
}
// CheckerStrategy a strategy based on an IP Checker
// allows to check that addresses are in a trusted IPs
type CheckerStrategy struct {
Checker *Checker
}
// GetIP return the selected IP
func (s *CheckerStrategy) GetIP(req *http.Request) string {
if s.Checker == nil {
return ""
}
xff := req.Header.Get(xForwardedFor)
xffs := strings.Split(xff, ",")
for i := len(xffs) - 1; i >= 0; i-- {
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xffTrimmed := strings.TrimSpace(xffs[i])
if contain, _ := s.Checker.Contains(xffTrimmed); !contain {
return xffTrimmed
}
}
return ""
}