def _sanity_check_translated_filters(self):
"""
Perform a few sanity checks on translated filters.
Checks the following are all true:
1. 'did_type' filters use an equals operator,
2. 'name' filters use an equality operator,
3. 'length' filters are parsable as an int type,
4. wildcard expressions use an equality operator,
5. 'created_at' value adheres to one of the date formats <VALID_DATE_FORMATS>,
6. there are no duplicate key+operator criteria.
:raises: ValueError, DIDFilterSyntaxError, DuplicateCriteriaInDIDFilter
"""
for or_group in self._filters:
or_group_test_duplicates = []
for and_group in or_group:
key, oper, value = and_group
if key == 'did_type': # (1)
if oper != operator.eq:
raise ValueError("Type operator must be equals.")
if key == 'name': # (2)
if oper not in (operator.eq, operator.ne):
raise ValueError(
"Name operator must be an equality operator.")
if key == 'length': # (3)
try:
int(value)
except ValueError:
raise ValueError('Length has to be an integer value.')
if isinstance(value, str): # (4)
if any([char in value for char in ['*', '%']]):
if oper not in [operator.eq, operator.ne]:
raise exception.DIDFilterSyntaxError(
"Wildcards can only be used with equality operators"
)
if key == 'created_at': # (5)
if not isinstance(value, datetime):
raise exception.DIDFilterSyntaxError(
"Couldn't parse date '{}'. Valid formats are: {}".
format(value, VALID_DATE_FORMATS))
or_group_test_duplicates.append((key, oper))
if len(set(or_group_test_duplicates)) != len(
or_group_test_duplicates): # (6)
raise exception.DuplicateCriteriaInDIDFilter()
def __init__(self, filters, model_class=None, strict_coerce=True):
if isinstance(filters, str):
self._filters, _ = parse_did_filter_from_string_fe(filters,
omit_name=True)
elif isinstance(filters, dict):
self._filters = [filters]
elif isinstance(filters, list):
self._filters = filters
else:
raise exception.DIDFilterSyntaxError(
"Input filters are of an unrecognised type.")
self._make_input_backwards_compatible()
self.mandatory_model_attributes = self._translate_filters(
model_class=model_class, strict_coerce=strict_coerce)
self._sanity_check_translated_filters()