from django.core.exceptions import ValidationError from django.core.validators import ( MaxLengthValidator, MaxValueValidator, MinLengthValidator, MinValueValidator, ) from django.utils.deconstruct import deconstructible from django.utils.translation import gettext_lazy as _ from django.utils.translation import ngettext_lazy class ArrayMaxLengthValidator(MaxLengthValidator): message = ngettext_lazy( "List contains %(show_value)d item, it should contain no more than " "%(limit_value)d.", "List contains %(show_value)d items, it should contain no more than " "%(limit_value)d.", "limit_value", ) class ArrayMinLengthValidator(MinLengthValidator): message = ngettext_lazy( "List contains %(show_value)d item, it should contain no fewer than " "%(limit_value)d.", "List contains %(show_value)d items, it should contain no fewer than " "%(limit_value)d.", "limit_value", ) @deconstructible class KeysValidator: """A validator designed for HStore to require/restrict keys.""" messages = { "missing_keys": _("Some keys were missing: %(keys)s"), "extra_keys": _("Some unknown keys were provided: %(keys)s"), } strict = False def __init__(self, keys, strict=False, messages=None): self.keys = set(keys) self.strict = strict if messages is not None: self.messages = {**self.messages, **messages} def __call__(self, value): keys = set(value) missing_keys = self.keys - keys if missing_keys: raise ValidationError( self.messages["missing_keys"], code="missing_keys", params={"keys": ", ".join(missing_keys)}, ) if self.strict: extra_keys = keys - self.keys if extra_keys: raise ValidationError( self.messages["extra_keys"], code="extra_keys", params={"keys": ", ".join(extra_keys)}, ) def __eq__(self, other): return ( isinstance(other, self.__class__) and self.keys == other.keys and self.messages == other.messages and self.strict == other.strict ) class RangeMaxValueValidator(MaxValueValidator): def compare(self, a, b): return a.upper is None or a.upper > b message = _( "Ensure that the upper bound of the range is not greater than %(limit_value)s." ) class RangeMinValueValidator(MinValueValidator): def compare(self, a, b): return a.lower is None or a.lower < b message = _( "Ensure that the lower bound of the range is not less than %(limit_value)s." )