traefik/pkg/middlewares/forwardedheaders/forwarded_header.go

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package forwardedheaders
import (
"net/http"
2019-03-15 08:42:03 +00:00
"github.com/containous/traefik/pkg/ip"
"github.com/vulcand/oxy/forward"
"github.com/vulcand/oxy/utils"
)
// XForwarded filter for XForwarded headers.
type XForwarded struct {
insecure bool
trustedIps []string
ipChecker *ip.Checker
next http.Handler
}
// NewXForwarded creates a new XForwarded.
func NewXForwarded(insecure bool, trustedIps []string, next http.Handler) (*XForwarded, error) {
var ipChecker *ip.Checker
if len(trustedIps) > 0 {
var err error
ipChecker, err = ip.NewChecker(trustedIps)
if err != nil {
return nil, err
}
}
return &XForwarded{
insecure: insecure,
trustedIps: trustedIps,
ipChecker: ipChecker,
next: next,
}, nil
}
func (x *XForwarded) isTrustedIP(ip string) bool {
if x.ipChecker == nil {
return false
}
return x.ipChecker.IsAuthorized(ip) == nil
}
func (x *XForwarded) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if !x.insecure && !x.isTrustedIP(r.RemoteAddr) {
utils.RemoveHeaders(r.Header, forward.XHeaders...)
}
x.next.ServeHTTP(w, r)
}