poulpe/user/forms.py

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


class CreateUserForm(UserCreationForm):
    key = forms.CharField(
            label="Clef de sécurité",
            widget=forms.PasswordInput,
            help_text="Cette clef est fournie par l'administrat·rice·eur "
                      "du site. Pour en obtenir une veuillez la-le contacter."
            )
    error_m = {'wrong_key': "La clef fournie est erronée."}

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

    def save(self, commit=True):
        user = super(CreateUserForm, self).save(commit=False)
        user.email = self.cleaned_data["email"]
        user.first_name = self.cleaned_data["first_name"]
        user.last_name = self.cleaned_data["last_name"]
        if commit:
            user.save()
        return user

    def clean_key(self):
        key = self.cleaned_data.get("key")
        if key != settings.CREATE_USER_KEY:
            raise forms.ValidationError(
                    self.error_m['wrong_key'],
                    code='wrong_key')
        return key