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