76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
package addprefix
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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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"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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typeName = "AddPrefix"
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)
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// AddPrefix is a middleware used to add prefix to an URL request.
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type addPrefix struct {
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next http.Handler
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prefix string
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name string
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}
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// New creates a new handler.
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func New(ctx context.Context, next http.Handler, config dynamic.AddPrefix, name string) (http.Handler, error) {
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log.FromContext(middlewares.GetLoggerCtx(ctx, name, typeName)).Debug("Creating middleware")
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var result *addPrefix
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if len(config.Prefix) > 0 {
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result = &addPrefix{
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prefix: config.Prefix,
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next: next,
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name: name,
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}
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} else {
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return nil, fmt.Errorf("prefix cannot be empty")
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}
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return result, nil
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}
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func (a *addPrefix) GetTracingInformation() (string, ext.SpanKindEnum) {
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return a.name, tracing.SpanKindNoneEnum
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}
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func (a *addPrefix) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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logger := log.FromContext(middlewares.GetLoggerCtx(req.Context(), a.name, typeName))
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oldURLPath := req.URL.Path
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req.URL.Path = ensureLeadingSlash(a.prefix + req.URL.Path)
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logger.Debugf("URL.Path is now %s (was %s).", req.URL.Path, oldURLPath)
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if req.URL.RawPath != "" {
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oldURLRawPath := req.URL.RawPath
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req.URL.RawPath = ensureLeadingSlash(a.prefix + req.URL.RawPath)
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logger.Debugf("URL.RawPath is now %s (was %s).", req.URL.RawPath, oldURLRawPath)
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}
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req.RequestURI = req.URL.RequestURI()
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a.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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