86 lines
1.9 KiB
Go
86 lines
1.9 KiB
Go
package stripprefixregex
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import (
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"context"
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"net/http"
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"regexp"
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"strings"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
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"github.com/traefik/traefik/v3/pkg/middlewares"
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"github.com/traefik/traefik/v3/pkg/middlewares/stripprefix"
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"go.opentelemetry.io/otel/trace"
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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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expressions []*regexp.Regexp
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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().Msg("Creating middleware")
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stripPrefix := stripPrefixRegex{
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next: next,
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name: name,
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}
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for _, exp := range config.Regex {
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reg, err := regexp.Compile(strings.TrimSpace(exp))
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if err != nil {
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return nil, err
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}
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stripPrefix.expressions = append(stripPrefix.expressions, reg)
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}
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return &stripPrefix, nil
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}
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func (s *stripPrefixRegex) GetTracingInformation() (string, string, trace.SpanKind) {
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return s.name, typeName, trace.SpanKindInternal
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}
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func (s *stripPrefixRegex) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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for _, exp := range s.expressions {
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parts := exp.FindStringSubmatch(req.URL.Path)
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if len(parts) > 0 && len(parts[0]) > 0 {
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prefix := parts[0]
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if !strings.HasPrefix(req.URL.Path, prefix) {
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continue
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}
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req.Header.Add(stripprefix.ForwardedPrefixHeader, prefix)
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req.URL.Path = ensureLeadingSlash(strings.Replace(req.URL.Path, prefix, "", 1))
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if req.URL.RawPath != "" {
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req.URL.RawPath = ensureLeadingSlash(req.URL.RawPath[len(prefix):])
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}
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req.RequestURI = 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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}
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s.next.ServeHTTP(rw, req)
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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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