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564 lines
20 KiB
564 lines
20 KiB
# 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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import base64
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from django.core.files.base import ContentFile
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from django.core import exceptions as django_exceptions
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from django.contrib.auth import get_user_model
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from django.db import IntegrityError, transaction
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from rest_framework import serializers, status
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from . import models
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from .utils import get_user_queryset, create_user
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from .exceptions import EtebaseValidationError
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User = get_user_model()
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def process_revisions_for_item(item, revision_data):
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chunks_objs = []
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chunks = revision_data.pop('chunks_relation')
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for chunk in chunks:
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uid = chunk[0]
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chunk_obj = models.CollectionItemChunk.objects.filter(uid=uid).first()
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if len(chunk) > 1:
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content = chunk[1]
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# If the chunk already exists we assume it's fine. Otherwise, we upload it.
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if chunk_obj is None:
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chunk_obj = models.CollectionItemChunk(uid=uid, collection=item.collection)
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chunk_obj.chunkFile.save('IGNORED', ContentFile(content))
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chunk_obj.save()
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else:
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if chunk_obj is None:
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raise EtebaseValidationError('chunk_no_content', 'Tried to create a new chunk without content')
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chunks_objs.append(chunk_obj)
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stoken = models.Stoken.objects.create()
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revision = models.CollectionItemRevision.objects.create(**revision_data, item=item, stoken=stoken)
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for chunk in chunks_objs:
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models.RevisionChunkRelation.objects.create(chunk=chunk, revision=revision)
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return revision
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def b64encode(value):
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return base64.urlsafe_b64encode(value).decode('ascii').strip('=')
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def b64decode(data):
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data += "=" * ((4 - len(data) % 4) % 4)
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return base64.urlsafe_b64decode(data)
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def b64decode_or_bytes(data):
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if isinstance(data, bytes):
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return data
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else:
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return b64decode(data)
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class BinaryBase64Field(serializers.Field):
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def to_representation(self, value):
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return value
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def to_internal_value(self, data):
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return b64decode_or_bytes(data)
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class CollectionEncryptionKeyField(BinaryBase64Field):
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def get_attribute(self, instance):
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request = self.context.get('request', None)
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if request is not None:
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return instance.members.get(user=request.user).encryptionKey
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return None
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class CollectionTypeField(BinaryBase64Field):
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def get_attribute(self, instance):
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request = self.context.get('request', None)
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if request is not None:
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collection_type = instance.members.get(user=request.user).collectionType
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return collection_type and collection_type.uid
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return None
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class UserSlugRelatedField(serializers.SlugRelatedField):
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def get_queryset(self):
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view = self.context.get('view', None)
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return get_user_queryset(super().get_queryset(), view)
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def __init__(self, **kwargs):
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super().__init__(slug_field=User.USERNAME_FIELD, **kwargs)
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def to_internal_value(self, data):
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return super().to_internal_value(data.lower())
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class ChunksField(serializers.RelatedField):
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def to_representation(self, obj):
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obj = obj.chunk
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if self.context.get('prefetch') == 'auto':
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with open(obj.chunkFile.path, 'rb') as f:
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return (obj.uid, f.read())
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else:
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return (obj.uid, )
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def to_internal_value(self, data):
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if data[0] is None or data[1] is None:
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raise EtebaseValidationError('no_null', 'null is not allowed')
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return (data[0], b64decode_or_bytes(data[1]))
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class BetterErrorsMixin:
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@property
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def errors(self):
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nice = []
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errors = super().errors
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for error_type in errors:
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if error_type == 'non_field_errors':
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nice.extend(
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self.flatten_errors(None, errors[error_type])
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)
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else:
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nice.extend(
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self.flatten_errors(error_type, errors[error_type])
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)
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if nice:
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return {'code': 'field_errors',
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'detail': 'Field validations failed.',
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'errors': nice}
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return {}
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def flatten_errors(self, field_name, errors):
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ret = []
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if isinstance(errors, dict):
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for error_key in errors:
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error = errors[error_key]
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ret.extend(self.flatten_errors("{}.{}".format(field_name, error_key), error))
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else:
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for error in errors:
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if hasattr(error, 'detail'):
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message = error.detail[0]
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elif hasattr(error, 'message'):
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message = error.message
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else:
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message = str(error)
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ret.append({
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'field': field_name,
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'code': error.code,
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'detail': message,
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})
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return ret
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def transform_validation_error(self, prefix, err):
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if hasattr(err, 'error_dict'):
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errors = self.flatten_errors(prefix, err.error_dict)
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elif not hasattr(err, 'message'):
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errors = self.flatten_errors(prefix, err.error_list)
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else:
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raise EtebaseValidationError(err.code, err.message)
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raise serializers.ValidationError({
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'code': 'field_errors',
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'detail': 'Field validations failed.',
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'errors': errors,
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})
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class CollectionItemChunkSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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class Meta:
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model = models.CollectionItemChunk
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fields = ('uid', 'chunkFile')
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class CollectionItemRevisionSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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chunks = ChunksField(
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source='chunks_relation',
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queryset=models.RevisionChunkRelation.objects.all(),
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style={'base_template': 'input.html'},
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many=True
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)
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meta = BinaryBase64Field()
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class Meta:
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model = models.CollectionItemRevision
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fields = ('chunks', 'meta', 'uid', 'deleted')
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class CollectionItemSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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encryptionKey = BinaryBase64Field(required=False, default=None, allow_null=True)
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etag = serializers.CharField(allow_null=True, write_only=True)
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content = CollectionItemRevisionSerializer(many=False)
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class Meta:
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model = models.CollectionItem
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fields = ('uid', 'version', 'encryptionKey', 'content', 'etag')
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def create(self, validated_data):
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"""Function that's called when this serializer creates an item"""
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validate_etag = self.context.get('validate_etag', False)
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etag = validated_data.pop('etag')
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revision_data = validated_data.pop('content')
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uid = validated_data.pop('uid')
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Model = self.__class__.Meta.model
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with transaction.atomic():
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instance, created = Model.objects.get_or_create(uid=uid, defaults=validated_data)
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cur_etag = instance.etag if not created else None
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if validate_etag and cur_etag != etag:
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raise EtebaseValidationError('wrong_etag', 'Wrong etag. Expected {} got {}'.format(cur_etag, etag),
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status_code=status.HTTP_409_CONFLICT)
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if not created:
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# We don't have to use select_for_update here because the unique constraint on current guards against
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# the race condition. But it's a good idea because it'll lock and wait rather than fail.
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current_revision = instance.revisions.filter(current=True).select_for_update().first()
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current_revision.current = None
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current_revision.save()
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process_revisions_for_item(instance, revision_data)
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return instance
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def update(self, instance, validated_data):
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# We never update, we always update in the create method
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raise NotImplementedError()
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class CollectionItemDepSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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etag = serializers.CharField()
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class Meta:
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model = models.CollectionItem
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fields = ('uid', 'etag')
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def validate(self, data):
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item = self.__class__.Meta.model.objects.get(uid=data['uid'])
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etag = data['etag']
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if item.etag != etag:
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raise EtebaseValidationError('wrong_etag', 'Wrong etag. Expected {} got {}'.format(item.etag, etag),
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status_code=status.HTTP_409_CONFLICT)
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return data
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class CollectionItemBulkGetSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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etag = serializers.CharField(required=False)
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class Meta:
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model = models.CollectionItem
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fields = ('uid', 'etag')
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class CollectionListMultiSerializer(BetterErrorsMixin, serializers.Serializer):
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collectionTypes = serializers.ListField(
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child=BinaryBase64Field()
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)
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class CollectionSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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collectionKey = CollectionEncryptionKeyField()
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# FIXME: make required once "collection-type-migration" is done
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collectionType = CollectionTypeField(required=False)
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accessLevel = serializers.SerializerMethodField('get_access_level_from_context')
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stoken = serializers.CharField(read_only=True)
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item = CollectionItemSerializer(many=False, source='main_item')
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class Meta:
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model = models.Collection
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fields = ('item', 'accessLevel', 'collectionKey', 'collectionType', 'stoken')
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def get_access_level_from_context(self, obj):
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request = self.context.get('request', None)
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if request is not None:
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return obj.members.get(user=request.user).accessLevel
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return None
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def create(self, validated_data):
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"""Function that's called when this serializer creates an item"""
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collection_key = validated_data.pop('collectionKey')
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# FIXME: remove the None fallback once "collection-type-migration" is done
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collection_type = validated_data.pop('collectionType', None)
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main_item_data = validated_data.pop('main_item')
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etag = main_item_data.pop('etag')
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revision_data = main_item_data.pop('content')
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instance = self.__class__.Meta.model(**validated_data)
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with transaction.atomic():
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if etag is not None:
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raise EtebaseValidationError('bad_etag', 'etag is not null')
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instance.save()
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main_item = models.CollectionItem.objects.create(**main_item_data, collection=instance)
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instance.main_item = main_item
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instance.full_clean()
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instance.save()
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process_revisions_for_item(main_item, revision_data)
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user = validated_data.get('owner')
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# FIXME: remove the if statement (and else branch) once "collection-type-migration" is done
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if collection_type is not None:
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collection_type_obj, _ = models.CollectionType.objects.get_or_create(uid=collection_type, owner=user)
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else:
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collection_type_obj = None
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models.CollectionMember(collection=instance,
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stoken=models.Stoken.objects.create(),
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user=user,
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accessLevel=models.AccessLevels.ADMIN,
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encryptionKey=collection_key,
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collectionType=collection_type_obj,
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).save()
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return instance
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def update(self, instance, validated_data):
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raise NotImplementedError()
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class CollectionMemberSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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username = UserSlugRelatedField(
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source='user',
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read_only=True,
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style={'base_template': 'input.html'},
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)
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class Meta:
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model = models.CollectionMember
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fields = ('username', 'accessLevel')
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def create(self, validated_data):
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raise NotImplementedError()
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def update(self, instance, validated_data):
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with transaction.atomic():
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# We only allow updating accessLevel
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access_level = validated_data.pop('accessLevel')
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if instance.accessLevel != access_level:
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instance.stoken = models.Stoken.objects.create()
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instance.accessLevel = access_level
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instance.save()
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return instance
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class CollectionInvitationSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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username = UserSlugRelatedField(
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source='user',
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queryset=User.objects,
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style={'base_template': 'input.html'},
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)
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collection = serializers.CharField(source='collection.uid')
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fromUsername = BinaryBase64Field(source='fromMember.user.username', read_only=True)
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fromPubkey = BinaryBase64Field(source='fromMember.user.userinfo.pubkey', read_only=True)
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signedEncryptionKey = BinaryBase64Field()
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class Meta:
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model = models.CollectionInvitation
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fields = ('username', 'uid', 'collection', 'signedEncryptionKey', 'accessLevel',
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'fromUsername', 'fromPubkey', 'version')
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def validate_user(self, value):
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request = self.context['request']
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if request.user.username == value.lower():
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raise EtebaseValidationError('no_self_invite', 'Inviting yourself is not allowed')
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return value
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def create(self, validated_data):
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request = self.context['request']
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collection = validated_data.pop('collection')
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member = collection.members.get(user=request.user)
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with transaction.atomic():
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try:
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return type(self).Meta.model.objects.create(**validated_data, fromMember=member)
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except IntegrityError:
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raise EtebaseValidationError('invitation_exists', 'Invitation already exists')
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def update(self, instance, validated_data):
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with transaction.atomic():
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instance.accessLevel = validated_data.pop('accessLevel')
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instance.signedEncryptionKey = validated_data.pop('signedEncryptionKey')
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instance.save()
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return instance
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class InvitationAcceptSerializer(BetterErrorsMixin, serializers.Serializer):
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collectionType = BinaryBase64Field()
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encryptionKey = BinaryBase64Field()
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def create(self, validated_data):
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with transaction.atomic():
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invitation = self.context['invitation']
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encryption_key = validated_data.get('encryptionKey')
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collection_type = validated_data.pop('collectionType')
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user = invitation.user
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collection_type_obj, _ = models.CollectionType.objects.get_or_create(uid=collection_type, owner=user)
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member = models.CollectionMember.objects.create(
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collection=invitation.collection,
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stoken=models.Stoken.objects.create(),
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user=user,
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accessLevel=invitation.accessLevel,
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encryptionKey=encryption_key,
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collectionType=collection_type_obj,
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)
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models.CollectionMemberRemoved.objects.filter(
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user=invitation.user, collection=invitation.collection).delete()
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invitation.delete()
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return member
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def update(self, instance, validated_data):
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raise NotImplementedError()
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class UserSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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pubkey = BinaryBase64Field(source='userinfo.pubkey')
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encryptedContent = BinaryBase64Field(source='userinfo.encryptedContent')
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class Meta:
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model = User
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fields = (User.USERNAME_FIELD, User.EMAIL_FIELD, 'pubkey', 'encryptedContent')
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class UserInfoPubkeySerializer(BetterErrorsMixin, serializers.ModelSerializer):
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pubkey = BinaryBase64Field()
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class Meta:
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model = models.UserInfo
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fields = ('pubkey', )
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class UserSignupSerializer(BetterErrorsMixin, serializers.ModelSerializer):
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class Meta:
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model = User
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fields = (User.USERNAME_FIELD, User.EMAIL_FIELD)
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extra_kwargs = {
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'username': {'validators': []}, # We specifically validate in SignupSerializer
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}
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class AuthenticationSignupSerializer(BetterErrorsMixin, serializers.Serializer):
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"""Used both for creating new accounts and setting up existing ones for the first time.
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When setting up existing ones the email is ignored."
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"""
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user = UserSignupSerializer(many=False)
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salt = BinaryBase64Field()
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loginPubkey = BinaryBase64Field()
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pubkey = BinaryBase64Field()
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encryptedContent = BinaryBase64Field()
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def create(self, validated_data):
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"""Function that's called when this serializer creates an item"""
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user_data = validated_data.pop('user')
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with transaction.atomic():
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try:
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view = self.context.get('view', None)
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user_queryset = get_user_queryset(User.objects.all(), view)
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instance = user_queryset.get(**{User.USERNAME_FIELD: user_data['username'].lower()})
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except User.DoesNotExist:
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# Create the user and save the casing the user chose as the first name
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try:
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instance = create_user(**user_data, password=None, first_name=user_data['username'], view=view)
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instance.clean_fields()
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except EtebaseValidationError as e:
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raise e
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except django_exceptions.ValidationError as e:
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self.transform_validation_error("user", e)
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except Exception as e:
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raise EtebaseValidationError('generic', str(e))
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if hasattr(instance, 'userinfo'):
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raise EtebaseValidationError('user_exists', 'User already exists', status_code=status.HTTP_409_CONFLICT)
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models.UserInfo.objects.create(**validated_data, owner=instance)
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return instance
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def update(self, instance, validated_data):
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raise NotImplementedError()
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class AuthenticationLoginChallengeSerializer(BetterErrorsMixin, serializers.Serializer):
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username = serializers.CharField(required=True)
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def create(self, validated_data):
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raise NotImplementedError()
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def update(self, instance, validated_data):
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raise NotImplementedError()
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class AuthenticationLoginSerializer(BetterErrorsMixin, serializers.Serializer):
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response = BinaryBase64Field()
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signature = BinaryBase64Field()
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def create(self, validated_data):
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raise NotImplementedError()
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def update(self, instance, validated_data):
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raise NotImplementedError()
|
|
|
|
|
|
class AuthenticationLoginInnerSerializer(AuthenticationLoginChallengeSerializer):
|
|
challenge = BinaryBase64Field()
|
|
host = serializers.CharField()
|
|
action = serializers.CharField()
|
|
|
|
def create(self, validated_data):
|
|
raise NotImplementedError()
|
|
|
|
def update(self, instance, validated_data):
|
|
raise NotImplementedError()
|
|
|
|
|
|
class AuthenticationChangePasswordInnerSerializer(AuthenticationLoginInnerSerializer):
|
|
loginPubkey = BinaryBase64Field()
|
|
encryptedContent = BinaryBase64Field()
|
|
|
|
class Meta:
|
|
model = models.UserInfo
|
|
fields = ('loginPubkey', 'encryptedContent')
|
|
|
|
def create(self, validated_data):
|
|
raise NotImplementedError()
|
|
|
|
def update(self, instance, validated_data):
|
|
with transaction.atomic():
|
|
instance.loginPubkey = validated_data.pop('loginPubkey')
|
|
instance.encryptedContent = validated_data.pop('encryptedContent')
|
|
instance.save()
|
|
|
|
return instance
|