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# Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
import base64
import binascii
import logging
from awscli.compat import six
logger = logging.getLogger(__name__)
def register_dynamodb_paginator_fix(event_emitter):
DynamoDBPaginatorFix(event_emitter).register_events()
def parse_last_evaluated_key_binary(parsed, **kwargs):
# Because we disable parsing blobs into a binary type and leave them as
# a base64 string if a binary field is present in the continuation token
# as is the case with dynamodb the binary will be double encoded. This
# ensures that the continuation token is properly converted to binary to
# avoid double encoding the contination token.
last_evaluated_key = parsed.get('LastEvaluatedKey', None)
if last_evaluated_key is None:
return
for key, val in last_evaluated_key.items():
if 'B' in val:
val['B'] = base64.b64decode(val['B'])
class DynamoDBPaginatorFix(object):
def __init__(self, event_emitter):
self._event_emitter = event_emitter
def register_events(self):
self._event_emitter.register(
'calling-command.dynamodb.*', self._maybe_register_pagination_fix
)
def _maybe_register_pagination_fix(self, parsed_globals, **kwargs):
if parsed_globals.paginate:
self._event_emitter.register(
'after-call.dynamodb.*', parse_last_evaluated_key_binary
)