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# 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.
"""Internal implementation of request body validating middleware."""
import jsonschema
from keystone import exception
from keystone.i18n import _
class SchemaValidator(object):
"""Resource reference validator class."""
validator = None
validator_org = jsonschema.Draft4Validator
def __init__(self, schema):
# NOTE(lbragstad): If at some point in the future we want to extend
# our validators to include something specific we need to check for,
# we can do it here. Nova's V3 API validators extend the validator to
# include `self._validate_minimum` and `self._validate_maximum`. This
# would be handy if we needed to check for something the jsonschema
# didn't by default. See the Nova V3 validator for details on how this
# is done.
validators = {}
validator_cls = jsonschema.validators.extend(self.validator_org,
validators)
fc = jsonschema.FormatChecker()
self.validator = validator_cls(schema, format_checker=fc)
def validate(self, *args, **kwargs):
try:
self.validator.validate(*args, **kwargs)
except jsonschema.ValidationError as ex:
# NOTE: For whole OpenStack message consistency, this error
# message has been written in a format consistent with WSME.
if len(ex.path) > 0:
# NOTE(lbragstad): Here we could think about using iter_errors
# as a method of providing invalid parameters back to the
# user.
# TODO(lbragstad): If the value of a field is confidential or
# too long, then we should build the masking in here so that
# we don't expose sensitive user information in the event it
# fails validation.
detail = _("Invalid input for field '%(path)s'. The value is "
"'%(value)s'.") % {'path': ex.path.pop(),
'value': ex.instance}
else:
detail = ex.message
raise exception.SchemaValidationError(detail=detail)
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