86 lines
2.4 KiB
Go
86 lines
2.4 KiB
Go
package stripprefix
|
|
|
|
import (
|
|
"context"
|
|
"net/http"
|
|
"strings"
|
|
|
|
"github.com/containous/traefik/v2/pkg/config/dynamic"
|
|
"github.com/containous/traefik/v2/pkg/log"
|
|
"github.com/containous/traefik/v2/pkg/middlewares"
|
|
"github.com/containous/traefik/v2/pkg/tracing"
|
|
"github.com/opentracing/opentracing-go/ext"
|
|
)
|
|
|
|
const (
|
|
// ForwardedPrefixHeader is the default header to set prefix.
|
|
ForwardedPrefixHeader = "X-Forwarded-Prefix"
|
|
typeName = "StripPrefix"
|
|
)
|
|
|
|
// stripPrefix is a middleware used to strip prefix from an URL request.
|
|
type stripPrefix struct {
|
|
next http.Handler
|
|
prefixes []string
|
|
forceSlash bool // TODO Must be removed (breaking), the default behavior must be forceSlash=false
|
|
name string
|
|
}
|
|
|
|
// New creates a new strip prefix middleware.
|
|
func New(ctx context.Context, next http.Handler, config dynamic.StripPrefix, name string) (http.Handler, error) {
|
|
log.FromContext(middlewares.GetLoggerCtx(ctx, name, typeName)).Debug("Creating middleware")
|
|
return &stripPrefix{
|
|
prefixes: config.Prefixes,
|
|
forceSlash: config.ForceSlash,
|
|
next: next,
|
|
name: name,
|
|
}, nil
|
|
}
|
|
|
|
func (s *stripPrefix) GetTracingInformation() (string, ext.SpanKindEnum) {
|
|
return s.name, tracing.SpanKindNoneEnum
|
|
}
|
|
|
|
func (s *stripPrefix) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
|
|
for _, prefix := range s.prefixes {
|
|
if strings.HasPrefix(req.URL.Path, prefix) {
|
|
req.URL.Path = s.getPrefixStripped(req.URL.Path, prefix)
|
|
if req.URL.RawPath != "" {
|
|
req.URL.RawPath = s.getPrefixStripped(req.URL.RawPath, prefix)
|
|
}
|
|
s.serveRequest(rw, req, strings.TrimSpace(prefix))
|
|
return
|
|
}
|
|
}
|
|
s.next.ServeHTTP(rw, req)
|
|
}
|
|
|
|
func (s *stripPrefix) serveRequest(rw http.ResponseWriter, req *http.Request, prefix string) {
|
|
req.Header.Add(ForwardedPrefixHeader, prefix)
|
|
req.RequestURI = req.URL.RequestURI()
|
|
s.next.ServeHTTP(rw, req)
|
|
}
|
|
|
|
func (s *stripPrefix) getPrefixStripped(urlPath, prefix string) string {
|
|
if s.forceSlash {
|
|
// Only for compatibility reason with the previous behavior,
|
|
// but the previous behavior is wrong.
|
|
// This needs to be removed in the next breaking version.
|
|
return "/" + strings.TrimPrefix(strings.TrimPrefix(urlPath, prefix), "/")
|
|
}
|
|
|
|
return ensureLeadingSlash(strings.TrimPrefix(urlPath, prefix))
|
|
}
|
|
|
|
func ensureLeadingSlash(str string) string {
|
|
if str == "" {
|
|
return str
|
|
}
|
|
|
|
if str[0] == '/' {
|
|
return str
|
|
}
|
|
|
|
return "/" + str
|
|
}
|