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# -*- coding: utf-8 -*-
import unicodedata
import binascii
from django.core.exceptions import ValidationError
from django.utils.deconstruct import deconstructible
from django.utils.encoding import force_str
from django.utils.translation import gettext_lazy as _
@deconstructible
class NoControlCharactersValidator:
message = _("Control Characters like new lines or tabs are not allowed.")
code = "no_control_characters"
whitelist = None
def __init__(self, message=None, code=None, whitelist=None):
if message:
self.message = message
if code:
self.code = code
if whitelist:
self.whitelist = whitelist
def __call__(self, value):
value = force_str(value)
whitelist = self.whitelist
category = unicodedata.category
for character in value:
if whitelist and character in whitelist:
continue
if category(character)[0] == "C":
params = {"value": value, "whitelist": whitelist}
raise ValidationError(self.message, code=self.code, params=params)
def __eq__(self, other):
return (
isinstance(other, NoControlCharactersValidator)
and (self.whitelist == other.whitelist)
and (self.message == other.message)
and (self.code == other.code)
)
@deconstructible
class NoWhitespaceValidator:
message = _("Leading and Trailing whitespaces are not allowed.")
code = "no_whitespace"
def __init__(self, message=None, code=None, whitelist=None):
if message:
self.message = message
if code:
self.code = code
def __call__(self, value):
value = force_str(value)
if value != value.strip():
params = {"value": value}
raise ValidationError(self.message, code=self.code, params=params)
def __eq__(self, other):
return (
isinstance(other, NoWhitespaceValidator)
and (self.message == other.message)
and (self.code == other.code)
)
@deconstructible
class HexValidator:
messages = {
"invalid": _("Only a hex string is allowed."),
"length": _("Invalid length. Must be %(length)d characters."),
"min_length": _("Ensure that there are more than %(min)s characters."),
"max_length": _("Ensure that there are no more than %(max)s characters."),
}
code = "hex_only"
def __init__(
self, length=None, min_length=None, max_length=None, message=None, code=None
):
self.length = length
self.min_length = min_length
self.max_length = max_length
if message:
self.message = message
else:
self.message = self.messages["invalid"]
if code:
self.code = code
def __call__(self, value):
value = force_str(value)
if self.length and len(value) != self.length:
raise ValidationError(
self.messages["length"],
code="hex_only_length",
params={"length": self.length},
)
if self.min_length and len(value) < self.min_length:
raise ValidationError(
self.messages["min_length"],
code="hex_only_min_length",
params={"min": self.min_length},
)
if self.max_length and len(value) > self.max_length:
raise ValidationError(
self.messages["max_length"],
code="hex_only_max_length",
params={"max": self.max_length},
)
try:
binascii.unhexlify(value)
except (TypeError, binascii.Error):
raise ValidationError(self.messages["invalid"], code="hex_only")
def __eq__(self, other):
return (
isinstance(other, HexValidator)
and (self.message == other.message)
and (self.code == other.code)
)
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