adjust the error output

fix https://github.com/chrislusf/seaweedfs/issues/2123

weed/s3api/s3err/error_handler.go

@@ -5,8 +5,10 @@ import (
 	"encoding/xml"
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/gorilla/mux"
 	"net/http"
 	"strconv"
+	"strings"
 	"time"
 )
 
@@ -26,15 +28,24 @@ func WriteEmptyResponse(w http.ResponseWriter, statusCode int) {
 }
 
 func WriteErrorResponse(w http.ResponseWriter, errorCode ErrorCode, r *http.Request) {
+	vars := mux.Vars(r)
+	bucket := vars["bucket"]
+	object := vars["object"]
+	if !strings.HasPrefix(object, "/") {
+		object = "/" + object
+	}
+
 	apiError := GetAPIError(errorCode)
-	errorResponse := getRESTErrorResponse(apiError, r.URL.Path)
+	errorResponse := getRESTErrorResponse(apiError, r.URL.Path, bucket, object)
 	encodedErrorResponse := EncodeXMLResponse(errorResponse)
 	WriteResponse(w, apiError.HTTPStatusCode, encodedErrorResponse, MimeXML)
 }
 
-func getRESTErrorResponse(err APIError, resource string) RESTErrorResponse {
+func getRESTErrorResponse(err APIError, resource string, bucket, object string) RESTErrorResponse {
 	return RESTErrorResponse{
 		Code:       err.Code,
+		BucketName: bucket,
+		Key:        object[1:],
 		Message:    err.Description,
 		Resource:   resource,
 		RequestID:  fmt.Sprintf("%d", time.Now().UnixNano()),

weed/s3api/s3err/s3api_errors.go

@@ -20,6 +20,8 @@ type RESTErrorResponse struct {
 	Message    string   `xml:"Message" json:"Message"`
 	Resource   string   `xml:"Resource" json:"Resource"`
 	RequestID  string   `xml:"RequestId" json:"RequestId"`
+	Key        string   `xml:"Key,omitempty" json:"Key,omitempty"`
+	BucketName string   `xml:"BucketName,omitempty" json:"BucketName,omitempty"`
 
 	// Underlying HTTP status code for the returned error
 	StatusCode int `xml:"-" json:"-"`