58 lines
1.6 KiB
Go
58 lines
1.6 KiB
Go
package replacepathregex
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import (
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"context"
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"fmt"
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"net/http"
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"regexp"
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"strings"
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"github.com/containous/traefik/config"
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"github.com/containous/traefik/middlewares"
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"github.com/containous/traefik/middlewares/replacepath"
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"github.com/containous/traefik/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 = "ReplacePathRegex"
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)
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// ReplacePathRegex is a middleware used to replace the path of a URL request with a regular expression.
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type replacePathRegex struct {
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next http.Handler
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regexp *regexp.Regexp
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replacement string
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name string
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}
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// New creates a new replace path regex middleware.
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func New(ctx context.Context, next http.Handler, config config.ReplacePathRegex, name string) (http.Handler, error) {
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middlewares.GetLogger(ctx, name, typeName).Debug("Creating middleware")
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exp, err := regexp.Compile(strings.TrimSpace(config.Regex))
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if err != nil {
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return nil, fmt.Errorf("error compiling regular expression %s: %s", config.Regex, err)
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}
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return &replacePathRegex{
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regexp: exp,
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replacement: strings.TrimSpace(config.Replacement),
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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 (rp *replacePathRegex) GetTracingInformation() (string, ext.SpanKindEnum) {
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return rp.name, tracing.SpanKindNoneEnum
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}
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func (rp *replacePathRegex) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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if rp.regexp != nil && len(rp.replacement) > 0 && rp.regexp.MatchString(req.URL.Path) {
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req.Header.Add(replacepath.ReplacedPathHeader, req.URL.Path)
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req.URL.Path = rp.regexp.ReplaceAllString(req.URL.Path, rp.replacement)
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req.RequestURI = req.URL.RequestURI()
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}
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rp.next.ServeHTTP(rw, req)
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}
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