traefik/pkg/middlewares/stripprefixregex/strip_prefix_regex.go

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package stripprefixregex
import (
"context"
"net/http"
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"regexp"
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"strings"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
"github.com/traefik/traefik/v3/pkg/middlewares"
"github.com/traefik/traefik/v3/pkg/middlewares/stripprefix"
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"go.opentelemetry.io/otel/trace"
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)
const (
typeName = "StripPrefixRegex"
)
// StripPrefixRegex is a middleware used to strip prefix from an URL request.
type stripPrefixRegex struct {
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next http.Handler
expressions []*regexp.Regexp
name string
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}
// New builds a new StripPrefixRegex middleware.
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,
name: name,
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}
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for _, exp := range config.Regex {
reg, err := regexp.Compile(strings.TrimSpace(exp))
if err != nil {
return nil, err
}
stripPrefix.expressions = append(stripPrefix.expressions, reg)
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}
return &stripPrefix, nil
}
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func (s *stripPrefixRegex) GetTracingInformation() (string, string, trace.SpanKind) {
return s.name, typeName, trace.SpanKindInternal
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}
func (s *stripPrefixRegex) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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for _, exp := range s.expressions {
parts := exp.FindStringSubmatch(req.URL.Path)
if len(parts) > 0 && len(parts[0]) > 0 {
prefix := parts[0]
if !strings.HasPrefix(req.URL.Path, prefix) {
continue
}
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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 != "" {
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)
return
}
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}
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s.next.ServeHTTP(rw, req)
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}
func ensureLeadingSlash(str string) string {
if str == "" {
return str
}
if str[0] == '/' {
return str
}
return "/" + str
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}