traefik/middlewares/addprefix/add_prefix.go
2018-11-14 10:18:03 +01:00

62 lines
1.5 KiB
Go

package addprefix
import (
"context"
"fmt"
"net/http"
"github.com/containous/traefik/config"
"github.com/containous/traefik/middlewares"
"github.com/containous/traefik/tracing"
"github.com/opentracing/opentracing-go/ext"
)
const (
typeName = "AddPrefix"
)
// AddPrefix is a middleware used to add prefix to an URL request.
type addPrefix struct {
next http.Handler
prefix string
name string
}
// New creates a new handler.
func New(ctx context.Context, next http.Handler, config config.AddPrefix, name string) (http.Handler, error) {
middlewares.GetLogger(ctx, name, typeName).Debug("Creating middleware")
var result *addPrefix
if len(config.Prefix) > 0 {
result = &addPrefix{
prefix: config.Prefix,
next: next,
name: name,
}
} else {
return nil, fmt.Errorf("prefix cannot be empty")
}
return result, nil
}
func (ap *addPrefix) GetTracingInformation() (string, ext.SpanKindEnum) {
return ap.name, tracing.SpanKindNoneEnum
}
func (ap *addPrefix) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
logger := middlewares.GetLogger(req.Context(), ap.name, typeName)
oldURLPath := req.URL.Path
req.URL.Path = ap.prefix + req.URL.Path
logger.Debugf("URL.Path is now %s (was %s).", req.URL.Path, oldURLPath)
if req.URL.RawPath != "" {
oldURLRawPath := req.URL.RawPath
req.URL.RawPath = ap.prefix + req.URL.RawPath
logger.Debugf("URL.RawPath is now %s (was %s).", req.URL.RawPath, oldURLRawPath)
}
req.RequestURI = req.URL.RequestURI()
ap.next.ServeHTTP(rw, req)
}