refactor osusers password forms

- use PasswordModelFormMixin from gvawebcore instead of own implementation in
  ChangeOsUserPasswordForm
- change import for PASSWORD_MISMATCH_ERROR

gnuviechadmin/osusers/admin.py

@@ -6,7 +6,7 @@ from django import forms
 from django.utils.translation import ugettext as _
 from django.contrib import admin
 
-from .forms import (
+from gvawebcore.forms import (
     PASSWORD_MISMATCH_ERROR
 )
 from .models import (

gnuviechadmin/osusers/forms.py

@@ -11,28 +11,16 @@ from django.utils.translation import ugettext_lazy as _
 from crispy_forms.helper import FormHelper
 from crispy_forms.layout import Submit
 
+from gvawebcore.forms import PasswordModelFormMixin
+
 from .models import User
 
-PASSWORD_MISMATCH_ERROR = _("Passwords don't match")
-"""
-Error message for non matching passwords.
-"""
 
-
+class ChangeOsUserPasswordForm(PasswordModelFormMixin, forms.ModelForm):
-class ChangeOsUserPasswordForm(forms.ModelForm):
     """
     A form for setting an OS user's password.
 
     """
-    password1 = forms.CharField(
-        label=_('Password'), widget=forms.PasswordInput,
-        required=False,
-    )
-    password2 = forms.CharField(
-        label=_('Password (again)'), widget=forms.PasswordInput,
-        required=False,
-    )
-
     class Meta:
         model = User
         fields = []
@@ -44,20 +32,6 @@ class ChangeOsUserPasswordForm(forms.ModelForm):
             'set_osuser_password', kwargs={'slug': self.instance.username})
         self.helper.add_input(Submit('submit', _('Set password')))
 
-    def clean_password2(self):
-        """
-        Check that the two password entries match.
-
-        :return: the validated password
-        :rtype: str or None
-
-        """
-        password1 = self.cleaned_data.get('password1')
-        password2 = self.cleaned_data.get('password2')
-        if password1 and password2 and password1 != password2:
-            raise forms.ValidationError(PASSWORD_MISMATCH_ERROR)
-        return password2
-
     def save(self, commit=True):
         """
         Save the provided password in hashed format.