src/core/forms.py
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# -*- coding: utf-8 -*-
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#
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# Copyright Institut de Recherche et d'Innovation © 2014
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#
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# contact@iri.centrepompidou.fr
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#
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# Ce code a été développé pour un premier usage dans JocondeLab, projet du 
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# ministère de la culture et de la communication visant à expérimenter la
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# recherche sémantique dans la base Joconde
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# (http://jocondelab.iri-research.org/).
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#
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# Ce logiciel est régi par la licence CeCILL-C soumise au droit français et
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# respectant les principes de diffusion des logiciels libres. Vous pouvez
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# utiliser, modifier et/ou redistribuer ce programme sous les conditions
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# de la licence CeCILL-C telle que diffusée par le CEA, le CNRS et l'INRIA 
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# sur le site "http://www.cecill.info".
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#
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# En contrepartie de l'accessibilité au code source et des droits de copie,
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# de modification et de redistribution accordés par cette licence, il n'est
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# offert aux utilisateurs qu'une garantie limitée.  Pour les mêmes raisons,
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# seule une responsabilité restreinte pèse sur l'auteur du programme,  le
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# titulaire des droits patrimoniaux et les concédants successifs.
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#
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# A cet égard  l'attention de l'utilisateur est attirée sur les risques
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# associés au chargement,  à l'utilisation,  à la modification et/ou au
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# développement et à la reproduction du logiciel par l'utilisateur étant 
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# donné sa spécificité de logiciel libre, qui peut le rendre complexe à 
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# manipuler et qui le réserve donc à des développeurs et des professionnels
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# avertis possédant  des  connaissances  informatiques approfondies.  Les
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# utilisateurs sont donc invités à charger  et  tester  l'adéquation  du
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# logiciel à leurs besoins dans des conditions permettant d'assurer la
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# sécurité de leurs systèmes et ou de leurs données et, plus généralement, 
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# à l'utiliser et l'exploiter dans les mêmes conditions de sécurité. 
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#
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# Le fait que vous puissiez accéder à cet en-tête signifie que vous avez 
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# pris connaissance de la licence CeCILL-C, et que vous en avez accepté les
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# termes.
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#
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'''
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Created on Aug 1, 2013
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@author: ymh
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'''
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from django.conf import settings
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from django.contrib.auth import get_user_model
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from django.contrib.auth.forms import (UserChangeForm as AuthUserChangeForm, 
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    UserCreationForm as AuthUserCreationForm)
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from django.core.exceptions import ValidationError
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from django.forms.fields import ChoiceField
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from django.utils.translation import ugettext as _
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User = get_user_model()
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class UserCreationform(AuthUserCreationForm):
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    class Meta:
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        model = User
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    def clean_username(self):
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        # Since User.username is unique, this check is redundant,
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        # but it sets a nicer error message than the ORM. See #13147.
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        username = self.cleaned_data["username"]
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        try:
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            User.objects.get(username=username)
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        except User.DoesNotExist:
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            return username
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        raise ValidationError(self.error_messages['duplicate_username'])    
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class UserChangeForm(AuthUserChangeForm):
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    language = ChoiceField(label=_("language"), choices=[(k,_(v)) for k,v in settings.LANGUAGES], initial=settings.LANGUAGE_CODE[:2])
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    class Meta:
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        model = User