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"""Custom password validators."""
from django.core.exceptions import ValidationError
from django.utils.translation import ugettext as _, ungettext
class ComplexityValidator(object):
"""Check password contains at least a few things."""
def __init__(self, upper=1, lower=1, digits=1, specials=1):
self.upper = upper
self.lower = lower
self.digits = digits
self.specials = specials
def validate(self, password, user=None):
special_characters = "~!@#$%^&*()_+{}\":;,'[]"
condition = (
self.digits > 0 and
sum(1 for char in password if char.isdigit()) < self.digits)
if condition:
raise ValidationError(
ungettext(
"Password must contain at least {} digit.",
"Password must contain at least {} digits.",
self.digits
).format(self.digits))
condition = (
self.lower > 0 and
sum(1 for char in password if char.islower()) < self.lower)
if condition:
raise ValidationError(
ungettext(
"Password must contain at least {} lowercase letter.",
"Password must contain at least {} lowercase letters.",
self.lower
)
.format(self.lower))
condition = (
self.upper > 0 and
sum(1 for char in password if char.isupper()) < self.upper)
if condition:
raise ValidationError(
ungettext(
"Password must contain at least {} uppercase letter.",
"Password must contain at least {} uppercase letters.",
self.upper
)
.format(self.upper))
condition = (
self.specials > 0 and
sum(1 for char in password if char in special_characters) <
self.specials)
if condition:
raise ValidationError(
ungettext(
"Password must contain at least {} special character.",
"Password must contain at least {} special characters.",
self.specials
)
.format(self.specials))
def get_help_text(self):
return _(
"Your password must contain a combination of different "
"character types.")