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