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# Copyright 2013 IBM Corp.
#
# 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.
import hashlib
import re
import uuid
import warnings
from oslo_config import cfg
import six
CONF = cfg.CONF
opts = [
cfg.StrOpt('namespace',
default='openstack',
help='namespace prefix for generated id'),
]
CONF.register_opts(opts, group='audit')
AUDIT_NS = None
if CONF.audit.namespace:
sha256_hash = hashlib.sha256(CONF.audit.namespace.encode('utf-8'))
AUDIT_NS = uuid.UUID(sha256_hash.hexdigest()[0:32])
VALID_EXCEPTIONS = ['default', 'initiator', 'observer', 'target']
def generate_uuid():
"""Generate a CADF identifier."""
if AUDIT_NS:
return str(uuid.uuid5(AUDIT_NS, str(uuid.uuid4())))
return str(uuid.uuid4())
def _check_valid_uuid(value):
"""Checks a value for one or multiple valid uuids joined together."""
if not value:
raise ValueError
value = re.sub('[{}-]|urn:uuid:', '', value)
for val in [value[i:i + 32] for i in range(0, len(value), 32)]:
uuid.UUID(val)
def is_valid(value):
"""Validation to ensure Identifier is correct.
If the Identifier value is a string type but not a valid UUID string,
warn against interoperability issues and return True. This relaxes
the requirement of having strict UUID checking.
"""
if value in VALID_EXCEPTIONS:
return True
try:
_check_valid_uuid(value)
except (ValueError, TypeError):
if not isinstance(value, six.string_types) or not value:
return False
warnings.warn(('Invalid uuid: %s. To ensure interoperability, '
'identifiers should be a valid uuid.' % (value)))
return True
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