move dependencies to vendor

vendor/github.com/docker/distribution/registry/client/errors.go

@@ -0,0 +1,69 @@
+package client
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/docker/distribution/registry/api/errcode"
+	"github.com/docker/distribution/registry/api/v2"
+)
+
+// UnexpectedHTTPStatusError is returned when an unexpected HTTP status is
+// returned when making a registry api call.
+type UnexpectedHTTPStatusError struct {
+	Status string
+}
+
+func (e *UnexpectedHTTPStatusError) Error() string {
+	return fmt.Sprintf("Received unexpected HTTP status: %s", e.Status)
+}
+
+// UnexpectedHTTPResponseError is returned when an expected HTTP status code
+// is returned, but the content was unexpected and failed to be parsed.
+type UnexpectedHTTPResponseError struct {
+	ParseErr error
+	Response []byte
+}
+
+func (e *UnexpectedHTTPResponseError) Error() string {
+	return fmt.Sprintf("Error parsing HTTP response: %s: %q", e.ParseErr.Error(), string(e.Response))
+}
+
+func parseHTTPErrorResponse(r io.Reader) error {
+	var errors errcode.Errors
+	body, err := ioutil.ReadAll(r)
+	if err != nil {
+		return err
+	}
+
+	if err := json.Unmarshal(body, &errors); err != nil {
+		return &UnexpectedHTTPResponseError{
+			ParseErr: err,
+			Response: body,
+		}
+	}
+	return errors
+}
+
+func handleErrorResponse(resp *http.Response) error {
+	if resp.StatusCode == 401 {
+		err := parseHTTPErrorResponse(resp.Body)
+		if uErr, ok := err.(*UnexpectedHTTPResponseError); ok {
+			return v2.ErrorCodeUnauthorized.WithDetail(uErr.Response)
+		}
+		return err
+	}
+	if resp.StatusCode >= 400 && resp.StatusCode < 500 {
+		return parseHTTPErrorResponse(resp.Body)
+	}
+	return &UnexpectedHTTPStatusError{Status: resp.Status}
+}
+
+// SuccessStatus returns true if the argument is a successful HTTP response
+// code (in the range 200 - 399 inclusive).
+func SuccessStatus(status int) bool {
+	return status >= 200 && status <= 399
+}