How to use custom passwords to validate django authentication passwords?

Question

As the question mentioned above, I will try to use a specific additional rule to verify the password during the registration process. An additional rule should be that the password is checked if it contains at least one number, one letter and one special character.

My approach to solving this problem. I created a file called validators.py.

from django.core.exceptions import ValidationError

class CustomPasswortValidator:

    def validate(value):

      # check for digit
      if not any(char.isdigit() for char in value):
          raise ValidationError(_('Password must contain at least 1 digit.'))

      # check for letter
      if not any(char.isalpha() for char in value):
          raise ValidationError(_('Password must contain at least 1 letter.'))

      # check for special character
      special_characters = "[~\!@#\$%\^&\*\(\)_\+{}\":;'\[\]]"
      if not any(char in special_characters for char in value):
        raise ValidationError(_('Password must contain at least 1 letter.'))

My user registration form is as follows:

from django import forms
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User


class RegistrationForm(UserCreationForm):
    first_name = forms.CharField(max_length=30, required=False,                                         
                                 help_text='Optional.')
    last_name = forms.CharField(max_length=30, required=False, 
                                 help_text='Optional.')
    email = forms.EmailField(max_length=254, help_text='Required. Inform a valid email address.')

    class Meta:
        model = User
        fields = ('username', 'first_name', 'last_name', 'email', 'password1', 'password2', )

I do not understand how I tell django that my own password validator should be used next to django AUTH_PASSWORD_VALIDATORS.

Answer 1

, e4c5, .

CustomPasswordValidator :

from django.core.exceptions import ValidationError
from django.utils.translation import ugettext as _

class CustomPasswordValidator():

    def __init__(self, min_length=1):
        self.min_length = min_length

    def validate(self, password, user=None):
        special_characters = "[~\!@#\$%\^&\*\(\)_\+{}\":;'\[\]]"
        if not any(char.isdigit() for char in password):
            raise ValidationError(_('Password must contain at least %(min_length)d digit.') % {'min_length': self.min_length})
        if not any(char.isalpha() for char in password):
            raise ValidationError(_('Password must contain at least %(min_length)d letter.') % {'min_length': self.min_length})
        if not any(char in special_characters for char in password):
            raise ValidationError(_('Password must contain at least %(min_length)d special character.') % {'min_length': self.min_length})

    def get_help_text(self):
        return ""

AUTH_PASSWORD_VALIDATORS settings.py !

AUTH_PASSWORD_VALIDATORS = [
{
    'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
},
{
    'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
},
{
    'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
},
{
    'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
},
{   'NAME': 'registration.validators.CustomPasswordValidator',

},]