79 lines
2.8 KiB
Python
79 lines
2.8 KiB
Python
# Copyright © 2017 Tom Hacohen
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, version 3.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from django.db import models
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from django.conf import settings
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from django.core.validators import RegexValidator
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from django.utils.functional import cached_property
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UidValidator = RegexValidator(regex=r'[a-zA-Z0-9\-_=]{44}', message='Not a valid UID. Expected a 256bit base64url.')
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class Collection(models.Model):
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uid = models.CharField(db_index=True, blank=False, null=False,
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max_length=44, validators=[UidValidator])
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version = models.PositiveSmallIntegerField()
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owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
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class Meta:
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unique_together = ('uid', 'owner')
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def __str__(self):
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return self.uid
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class CollectionItem(models.Model):
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uid = models.CharField(db_index=True, blank=False, null=False,
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max_length=44, validators=[UidValidator])
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version = models.PositiveSmallIntegerField()
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encryptionKey = models.BinaryField(editable=True, blank=False, null=False)
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collection = models.ForeignKey(Collection, on_delete=models.CASCADE)
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class Meta:
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unique_together = ('uid', 'collection')
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@cached_property
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def content(self):
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return self.snapshots.get(current=True)
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def __str__(self):
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return self.uid
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class CollectionItemSnapshot(models.Model):
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item = models.ForeignKey(CollectionItem, related_name='snapshots', on_delete=models.CASCADE)
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current = models.BooleanField(default=True)
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chunkHmac = models.CharField(max_length=50, blank=False, null=False)
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class Meta:
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unique_together = ('item', 'current')
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def __str__(self):
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return "{}, current={}".format(self.item.uid, self.current)
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class CollectionItemChunk(models.Model):
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uid = models.CharField(db_index=True, blank=False, null=False,
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max_length=44, validators=[UidValidator])
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itemSnapshot = models.ForeignKey(CollectionItemSnapshot, related_name='chunks', null=True, on_delete=models.SET_NULL)
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order = models.CharField(max_length=100, blank=False, null=False)
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class Meta:
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# unique_together = ('itemSnapshot', 'order') # Currently off because we set the item snapshot to null on deletion
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ordering = ['order']
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def __str__(self):
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return self.uid
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