Fix deprecated base64.decodestring warning

Replace base64.decodestring with
oslo_serialization.base64.decode_as_bytes.

Change-Id: Ifce0e8d9633f33f12040a1d5a2235cbcb673a436
Closes-Bug: #1797815

1 files changed, 2 insertions, 4 deletions

diff --git a/nova/api/validation/validators.py b/nova/api/validation/validators.py
index de3225a050..9537bb9644 100644
--- a/nova/api/validation/validators.py
+++ b/nova/api/validation/validators.py
@@ -16,12 +16,12 @@ Internal implementation of request Body validating middleware.
 
 """
 
-import base64
 import re
 
 import jsonschema
 from jsonschema import exceptions as jsonschema_exc
 import netaddr
+from oslo_serialization import base64
 from oslo_utils import timeutils
 from oslo_utils import uuidutils
 import rfc3986
@@ -58,9 +58,7 @@ def _validate_base64_format(instance):
     try:
         if isinstance(instance, six.text_type):
             instance = instance.encode('utf-8')
-        base64.decodestring(instance)
-    except base64.binascii.Error:
-        return False
+        base64.decode_as_bytes(instance)
     except TypeError:
         # The name must be string type. If instance isn't string type, the
         # TypeError will be raised at here.