traefik/middlewares/stripPrefix.go
2017-11-21 14:28:03 +01:00

48 lines
1.2 KiB
Go

package middlewares
import (
"net/http"
"strings"
)
// ForwardedPrefixHeader is the default header to set prefix
const ForwardedPrefixHeader = "X-Forwarded-Prefix"
// StripPrefix is a middleware used to strip prefix from an URL request
type StripPrefix struct {
Handler http.Handler
Prefixes []string
}
func (s *StripPrefix) ServeHTTP(w http.ResponseWriter, r *http.Request) {
for _, prefix := range s.Prefixes {
if strings.HasPrefix(r.URL.Path, prefix) {
r.URL.Path = stripPrefix(r.URL.Path, prefix)
if r.URL.RawPath != "" {
r.URL.RawPath = stripPrefix(r.URL.RawPath, prefix)
}
s.serveRequest(w, r, strings.TrimSpace(prefix))
return
}
}
http.NotFound(w, r)
}
func (s *StripPrefix) serveRequest(w http.ResponseWriter, r *http.Request, prefix string) {
r.Header.Add(ForwardedPrefixHeader, prefix)
r.RequestURI = r.URL.RequestURI()
s.Handler.ServeHTTP(w, r)
}
// SetHandler sets handler
func (s *StripPrefix) SetHandler(Handler http.Handler) {
s.Handler = Handler
}
func stripPrefix(s, prefix string) string {
return ensureLeadingSlash(strings.TrimPrefix(s, prefix))
}
func ensureLeadingSlash(str string) string {
return "/" + strings.TrimPrefix(str, "/")
}