traefik/auth/forward.go

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2017-08-25 16:22:03 +00:00
package auth
import (
"io/ioutil"
"net/http"
"github.com/containous/traefik/log"
"github.com/containous/traefik/types"
)
// Forward the authentication to a external server
func Forward(forward *types.Forward, w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
httpClient := http.Client{}
if forward.TLS != nil {
tlsConfig, err := forward.TLS.CreateTLSConfig()
if err != nil {
log.Debugf("Impossible to configure TLS to call %s. Cause %s", forward.Address, err)
w.WriteHeader(http.StatusInternalServerError)
return
}
httpClient.Transport = &http.Transport{
TLSClientConfig: tlsConfig,
}
}
forwardReq, err := http.NewRequest(http.MethodGet, forward.Address, nil)
if err != nil {
log.Debugf("Error calling %s. Cause %s", forward.Address, err)
w.WriteHeader(http.StatusInternalServerError)
return
}
forwardReq.Header = r.Header
forwardResponse, forwardErr := httpClient.Do(forwardReq)
if forwardErr != nil {
log.Debugf("Error calling %s. Cause: %s", forward.Address, forwardErr)
w.WriteHeader(http.StatusInternalServerError)
return
}
body, readError := ioutil.ReadAll(forwardResponse.Body)
if readError != nil {
log.Debugf("Error reading body %s. Cause: %s", forward.Address, readError)
w.WriteHeader(http.StatusInternalServerError)
return
}
defer forwardResponse.Body.Close()
if forwardResponse.StatusCode < http.StatusOK || forwardResponse.StatusCode >= http.StatusMultipleChoices {
log.Debugf("Remote error %s. StatusCode: %d", forward.Address, forwardResponse.StatusCode)
w.WriteHeader(forwardResponse.StatusCode)
w.Write(body)
return
}
r.RequestURI = r.URL.RequestURI()
next(w, r)
}