55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
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package middlewares
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import (
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"net/http"
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"github.com/containous/mux"
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"github.com/containous/traefik/log"
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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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Handler http.Handler
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router *mux.Router
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}
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// NewStripPrefixRegex builds a new StripPrefixRegex given a handler and prefixes
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func NewStripPrefixRegex(handler http.Handler, prefixes []string) *StripPrefixRegex {
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stripPrefix := StripPrefixRegex{Handler: handler, router: mux.NewRouter()}
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for _, prefix := range prefixes {
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stripPrefix.router.PathPrefix(prefix)
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}
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return &stripPrefix
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}
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func (s *StripPrefixRegex) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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var match mux.RouteMatch
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if s.router.Match(r, &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(r.URL.Path) {
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log.Error("Error in stripPrefix middleware", err)
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return
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}
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r.URL.Path = r.URL.Path[len(prefix.Path):]
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r.Header[forwardedPrefixHeader] = []string{prefix.Path}
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r.RequestURI = r.URL.RequestURI()
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s.Handler.ServeHTTP(w, r)
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return
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}
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http.NotFound(w, r)
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}
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// SetHandler sets handler
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func (s *StripPrefixRegex) SetHandler(Handler http.Handler) {
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s.Handler = Handler
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}
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