155 lines
5.4 KiB
Python
155 lines
5.4 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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import base64
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from django.contrib.auth import get_user_model
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from django.db import transaction
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from rest_framework import serializers
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from . import models
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User = get_user_model()
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class BinaryBase64Field(serializers.Field):
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def to_representation(self, value):
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return base64.b64encode(value).decode('ascii')
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def to_internal_value(self, data):
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return base64.b64decode(data)
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class CollectionSerializer(serializers.ModelSerializer):
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owner = serializers.SlugRelatedField(
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slug_field=User.USERNAME_FIELD,
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read_only=True
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)
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encryptionKey = serializers.SerializerMethodField('get_key_from_context')
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permissions = serializers.SerializerMethodField('get_permission_from_context')
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ctag = serializers.SerializerMethodField('get_ctag')
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class Meta:
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model = models.Collection
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fields = ('uid', 'version', 'owner', 'encryptionKey', 'permissions', 'ctag')
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def get_key_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 'FIXME'
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return None
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def get_permission_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 'FIXME'
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return 'readOnly'
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def get_ctag(self, obj):
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return 'FIXME'
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class CollectionItemChunkSerializer(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 CollectionItemRevisionBaseSerializer(serializers.ModelSerializer):
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encryptionKey = BinaryBase64Field()
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chunks = serializers.SlugRelatedField(
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slug_field='uid',
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queryset=models.CollectionItemChunk.objects.all(),
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many=True
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)
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class Meta:
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model = models.CollectionItemRevision
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fields = ('version', 'encryptionKey', 'chunks', 'hmac', 'isDeletion')
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class CollectionItemRevisionSerializer(CollectionItemRevisionBaseSerializer):
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chunksUrls = serializers.SerializerMethodField('get_chunks_urls')
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class Meta(CollectionItemRevisionBaseSerializer.Meta):
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fields = CollectionItemRevisionBaseSerializer.Meta.fields + ('chunksUrls', )
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# FIXME: currently the user is exposed in the url. We don't want that, and we can probably avoid that but still
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# save it under the user.
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# We would probably be better off just let the user calculate the urls from the uid and a base url for the snapshot.
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# E.g. chunkBaseUrl: "/media/bla/bla/" or chunkBaseUrl: "https://media.etesync.com/bla/bla"
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def get_chunks_urls(self, obj):
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ret = []
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for chunk in obj.chunks.all():
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ret.append(chunk.chunkFile.url)
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return ret
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class CollectionItemRevisionInlineSerializer(CollectionItemRevisionBaseSerializer):
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chunksData = serializers.SerializerMethodField('get_chunks_data')
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class Meta(CollectionItemRevisionBaseSerializer.Meta):
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fields = CollectionItemRevisionBaseSerializer.Meta.fields + ('chunksData', )
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def get_chunks_data(self, obj):
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ret = []
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for chunk in obj.chunks.all():
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with open(chunk.chunkFile.path, 'rb') as f:
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ret.append(base64.b64encode(f.read()).decode('ascii'))
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return ret
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class CollectionItemSerializer(serializers.ModelSerializer):
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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', 'content')
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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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revision_data = validated_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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instance.save()
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chunks = revision_data.pop('chunks')
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revision = models.CollectionItemRevision.objects.create(**revision_data, item=instance)
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revision.chunks.set(chunks)
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return instance
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def update(self, instance, validated_data):
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"""Function that's called when this serializer is meant to update an item"""
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revision_data = validated_data.pop('content')
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with transaction.atomic():
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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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chunks = revision_data.pop('chunks')
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revision = models.CollectionItemRevision.objects.create(**revision_data, item=instance)
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revision.chunks.set(chunks)
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return instance
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class CollectionItemInlineSerializer(CollectionItemSerializer):
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content = CollectionItemRevisionInlineSerializer(read_only=True, many=False)
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