80 lines
2 KiB
Go
80 lines
2 KiB
Go
package stripprefixregex
|
|
|
|
import (
|
|
"context"
|
|
"net/http"
|
|
"strings"
|
|
|
|
"github.com/containous/mux"
|
|
"github.com/containous/traefik/config"
|
|
"github.com/containous/traefik/middlewares"
|
|
"github.com/containous/traefik/middlewares/stripprefix"
|
|
"github.com/containous/traefik/tracing"
|
|
"github.com/opentracing/opentracing-go/ext"
|
|
)
|
|
|
|
const (
|
|
typeName = "StripPrefixRegex"
|
|
)
|
|
|
|
// StripPrefixRegex is a middleware used to strip prefix from an URL request.
|
|
type stripPrefixRegex struct {
|
|
next http.Handler
|
|
router *mux.Router
|
|
name string
|
|
}
|
|
|
|
// New builds a new StripPrefixRegex middleware.
|
|
func New(ctx context.Context, next http.Handler, config config.StripPrefixRegex, name string) (http.Handler, error) {
|
|
middlewares.GetLogger(ctx, name, typeName).Debug("Creating middleware")
|
|
|
|
stripPrefix := stripPrefixRegex{
|
|
next: next,
|
|
router: mux.NewRouter(),
|
|
name: name,
|
|
}
|
|
|
|
for _, prefix := range config.Regex {
|
|
stripPrefix.router.PathPrefix(prefix)
|
|
}
|
|
|
|
return &stripPrefix, nil
|
|
}
|
|
|
|
func (s *stripPrefixRegex) GetTracingInformation() (string, ext.SpanKindEnum) {
|
|
return s.name, tracing.SpanKindNoneEnum
|
|
}
|
|
|
|
func (s *stripPrefixRegex) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
|
|
var match mux.RouteMatch
|
|
if s.router.Match(req, &match) {
|
|
params := make([]string, 0, len(match.Vars)*2)
|
|
for key, val := range match.Vars {
|
|
params = append(params, key)
|
|
params = append(params, val)
|
|
}
|
|
|
|
prefix, err := match.Route.URL(params...)
|
|
if err != nil || len(prefix.Path) > len(req.URL.Path) {
|
|
logger := middlewares.GetLogger(req.Context(), s.name, typeName)
|
|
logger.Error("Error in stripPrefix middleware", err)
|
|
return
|
|
}
|
|
|
|
req.URL.Path = req.URL.Path[len(prefix.Path):]
|
|
if req.URL.RawPath != "" {
|
|
req.URL.RawPath = req.URL.RawPath[len(prefix.Path):]
|
|
}
|
|
req.Header.Add(stripprefix.ForwardedPrefixHeader, prefix.Path)
|
|
req.RequestURI = ensureLeadingSlash(req.URL.RequestURI())
|
|
|
|
s.next.ServeHTTP(rw, req)
|
|
return
|
|
}
|
|
http.NotFound(rw, req)
|
|
}
|
|
|
|
func ensureLeadingSlash(str string) string {
|
|
return "/" + strings.TrimPrefix(str, "/")
|
|
}
|