1# (c) 2018-2020 

2# MPIB <https://www.mpib-berlin.mpg.de/>, 

3# MPI-CBS <https://www.cbs.mpg.de/>, 

4# MPIP <http://www.psych.mpg.de/> 

5# 

6# This file is part of Castellum. 

7# 

8# Castellum is free software; you can redistribute it and/or modify it 

9# under the terms of the GNU Affero General Public License as published 

10# by the Free Software Foundation; either version 3 of the License, or 

11# (at your option) any later version. 

12# 

13# Castellum is distributed in the hope that it will be useful, but 

14# WITHOUT ANY WARRANTY; without even the implied warranty of 

15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 

16# Affero General Public License for more details. 

17# 

18# You should have received a copy of the GNU Affero General Public 

19# License along with Castellum. If not, see 

20# <http://www.gnu.org/licenses/>. 

21 

22from django.conf import settings 

23from django.db import models 

24 

25from castellum.subjects.models import Subject 

26from castellum.utils import uuid_str 

27 

28 

29class Domain(models.Model): 

30 key = models.CharField(max_length=64, default=uuid_str, unique=True, editable=False) 

31 bits = models.PositiveIntegerField(default=40) 

32 

33 def __str__(self): 

34 return self.key 

35 

36 

37class Pseudonym(models.Model): 

38 subject = models.ForeignKey(Subject, on_delete=models.SET_NULL, blank=True, null=True) 

39 domain = models.ForeignKey(Domain, on_delete=models.CASCADE) 

40 pseudonym = models.CharField(max_length=64, default=None) 

41 

42 class Meta: 

43 unique_together = ( 

44 ('domain', 'pseudonym'), 

45 ('domain', 'subject'), 

46 ) 

47 

48 def __str__(self): 

49 return self.pseudonym 

50 

51 def save(self, *args, **kwargs): 

52 if not self.pseudonym: 

53 self.pseudonym = settings.CASTELLUM_PSEUDONYM_GENERATE(self.domain.bits) 

54 super().save(*args, **kwargs)