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#
# -------------------------------------------------------------------------
# Copyright (c) 2015-2017 AT&T Intellectual Property
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License 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.
#
# -------------------------------------------------------------------------
#
from uuid import UUID
import six
def validate_uuid4(uuid_string):
"""Validate that a UUID string is in fact a valid uuid4.
Happily, the uuid module does the actual checking for us.
It is vital that the 'version' kwarg be passed
to the UUID() call, otherwise any 32-character
hex string is considered valid.
"""
if not isinstance(uuid_string, six.string_types):
return False
try:
val = UUID(uuid_string.translate(None, '-'), version=4)
except ValueError:
# If it's a value error, then the string
# is not a valid hex code for a UUID.
return False
# If the uuid_string is a valid hex code,
# but an invalid uuid4, the UUID.__init__ will convert it to a
# valid uuid4. This is bad for validation purposes.
return val.hex == uuid_string
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