246 lines
8.5 KiB
Python
246 lines
8.5 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 pathlib import Path
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from django.db import models, transaction
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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.db.models import Q
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from django.utils.functional import cached_property
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from django.utils.crypto import get_random_string
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from rest_framework import status
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from . import app_settings
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from .exceptions import EtebaseValidationError
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UidValidator = RegexValidator(regex=r"^[a-zA-Z0-9\-_]{20,}$", message="Not a valid UID")
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class CollectionType(models.Model):
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owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
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uid = models.BinaryField(editable=True, blank=False, null=False, db_index=True, unique=True)
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class Collection(models.Model):
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main_item = models.OneToOneField("CollectionItem", related_name="parent", null=True, on_delete=models.SET_NULL)
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owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
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def __str__(self):
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return self.uid
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@cached_property
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def uid(self):
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return self.main_item.uid
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@property
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def content(self):
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return self.main_item.content
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@property
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def etag(self):
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return self.content.uid
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@cached_property
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def stoken(self):
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stoken = (
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Stoken.objects.filter(
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Q(collectionitemrevision__item__collection=self) | Q(collectionmember__collection=self)
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)
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.order_by("id")
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.last()
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)
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if stoken is None:
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raise Exception("stoken is None. Should never happen")
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return stoken.uid
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def validate_unique(self, exclude=None):
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super().validate_unique(exclude=exclude)
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if exclude is None or "main_item" in exclude:
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return
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if (
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self.__class__.objects.filter(owner=self.owner, main_item__uid=self.main_item.uid)
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.exclude(id=self.id)
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.exists()
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):
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raise EtebaseValidationError(
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"unique_uid", "Collection with this uid already exists", status_code=status.HTTP_409_CONFLICT
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)
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class CollectionItem(models.Model):
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uid = models.CharField(db_index=True, blank=False, max_length=43, validators=[UidValidator])
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collection = models.ForeignKey(Collection, related_name="items", on_delete=models.CASCADE)
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version = models.PositiveSmallIntegerField()
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encryptionKey = models.BinaryField(editable=True, blank=False, null=True)
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class Meta:
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unique_together = ("uid", "collection")
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def __str__(self):
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return "{} {}".format(self.uid, self.collection.uid)
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@cached_property
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def content(self):
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return self.revisions.get(current=True)
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@property
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def etag(self):
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return self.content.uid
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def chunk_directory_path(instance, filename):
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custom_func = app_settings.CHUNK_PATH_FUNC
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if custom_func is not None:
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return custom_func(instance, filename)
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col = instance.collection
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user_id = col.owner.id
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uid_prefix = instance.uid[:2]
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uid_rest = instance.uid[2:]
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return Path("user_{}".format(user_id), col.uid, uid_prefix, uid_rest)
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class CollectionItemChunk(models.Model):
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uid = models.CharField(db_index=True, blank=False, null=False, max_length=60, validators=[UidValidator])
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collection = models.ForeignKey(Collection, related_name="chunks", on_delete=models.CASCADE)
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chunkFile = models.FileField(upload_to=chunk_directory_path, max_length=150, unique=True)
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def __str__(self):
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return self.uid
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class Meta:
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unique_together = ("collection", "uid")
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def generate_stoken_uid():
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return get_random_string(32, allowed_chars="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_")
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class Stoken(models.Model):
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uid = models.CharField(
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db_index=True,
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unique=True,
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blank=False,
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null=False,
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default=generate_stoken_uid,
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max_length=43,
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validators=[UidValidator],
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)
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class CollectionItemRevision(models.Model):
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stoken = models.OneToOneField(Stoken, on_delete=models.PROTECT)
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uid = models.CharField(
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db_index=True, unique=True, blank=False, null=False, max_length=43, validators=[UidValidator]
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)
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item = models.ForeignKey(CollectionItem, related_name="revisions", on_delete=models.CASCADE)
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meta = models.BinaryField(editable=True, blank=False, null=False)
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current = models.BooleanField(db_index=True, default=True, null=True)
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deleted = models.BooleanField(default=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.uid, self.item.uid, self.current)
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class RevisionChunkRelation(models.Model):
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chunk = models.ForeignKey(CollectionItemChunk, related_name="revisions_relation", on_delete=models.CASCADE)
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revision = models.ForeignKey(CollectionItemRevision, related_name="chunks_relation", on_delete=models.CASCADE)
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class Meta:
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ordering = ("id",)
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class AccessLevels(models.IntegerChoices):
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READ_ONLY = 0
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ADMIN = 1
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READ_WRITE = 2
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class CollectionMember(models.Model):
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stoken = models.OneToOneField(Stoken, on_delete=models.PROTECT, null=True)
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collection = models.ForeignKey(Collection, related_name="members", on_delete=models.CASCADE)
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user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
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encryptionKey = models.BinaryField(editable=True, blank=False, null=False)
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collectionType = models.ForeignKey(CollectionType, on_delete=models.PROTECT, null=True)
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accessLevel = models.IntegerField(choices=AccessLevels.choices, default=AccessLevels.READ_ONLY,)
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class Meta:
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unique_together = ("user", "collection")
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def __str__(self):
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return "{} {}".format(self.collection.uid, self.user)
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def revoke(self):
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with transaction.atomic():
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CollectionMemberRemoved.objects.update_or_create(
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collection=self.collection, user=self.user, defaults={"stoken": Stoken.objects.create(),},
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)
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self.delete()
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class CollectionMemberRemoved(models.Model):
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stoken = models.OneToOneField(Stoken, on_delete=models.PROTECT, null=True)
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collection = models.ForeignKey(Collection, related_name="removed_members", on_delete=models.CASCADE)
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user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
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class Meta:
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unique_together = ("user", "collection")
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def __str__(self):
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return "{} {}".format(self.collection.uid, self.user)
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class CollectionInvitation(models.Model):
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uid = models.CharField(db_index=True, blank=False, null=False, max_length=43, validators=[UidValidator])
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version = models.PositiveSmallIntegerField(default=1)
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fromMember = models.ForeignKey(CollectionMember, on_delete=models.CASCADE)
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# FIXME: make sure to delete all invitations for the same collection once one is accepted
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# Make sure to not allow invitations if already a member
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user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name="incoming_invitations", on_delete=models.CASCADE)
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signedEncryptionKey = models.BinaryField(editable=False, blank=False, null=False)
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accessLevel = models.IntegerField(choices=AccessLevels.choices, default=AccessLevels.READ_ONLY,)
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class Meta:
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unique_together = ("user", "fromMember")
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def __str__(self):
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return "{} {}".format(self.fromMember.collection.uid, self.user)
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@cached_property
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def collection(self):
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return self.fromMember.collection
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class UserInfo(models.Model):
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owner = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, primary_key=True)
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version = models.PositiveSmallIntegerField(default=1)
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loginPubkey = models.BinaryField(editable=True, blank=False, null=False)
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pubkey = models.BinaryField(editable=True, blank=False, null=False)
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encryptedContent = models.BinaryField(editable=True, blank=False, null=False)
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salt = models.BinaryField(editable=True, blank=False, null=False)
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def __str__(self):
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return "UserInfo<{}>".format(self.owner)
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