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Python

# Copyright © 2017 Tom Hacohen
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, version 3.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from django.conf import settings
from django.contrib.auth import login, get_user_model
from django.db import IntegrityError, transaction
from django.db.models import Q
from django.core.exceptions import ObjectDoesNotExist
from django.http import HttpResponseBadRequest, HttpResponse, Http404
from django.shortcuts import get_object_or_404
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_POST
from rest_framework import status
from rest_framework import viewsets
from rest_framework import parsers
from rest_framework.decorators import action as action_decorator
from rest_framework.response import Response
from . import app_settings, paginators
from .models import Collection, CollectionItem, CollectionItemChunk
from .serializers import (
CollectionSerializer,
CollectionItemSerializer,
CollectionItemInlineSerializer,
CollectionItemSnapshotSerializer,
CollectionItemSnapshotInlineSerializer,
CollectionItemChunkSerializer
)
User = get_user_model()
class BaseViewSet(viewsets.ModelViewSet):
authentication_classes = tuple(app_settings.API_AUTHENTICATORS)
permission_classes = tuple(app_settings.API_PERMISSIONS)
def get_serializer_class(self):
serializer_class = self.serializer_class
if self.request.method == 'PUT':
serializer_class = getattr(self, 'serializer_update_class', serializer_class)
return serializer_class
def get_collection_queryset(self, queryset=Collection.objects):
return queryset.all()
class CollectionViewSet(BaseViewSet):
allowed_methods = ['GET', 'POST', 'DELETE']
permission_classes = BaseViewSet.permission_classes
queryset = Collection.objects.all()
serializer_class = CollectionSerializer
lookup_field = 'uid'
def get_queryset(self):
queryset = type(self).queryset
return self.get_collection_queryset(queryset)
def destroy(self, request, uid=None):
# FIXME: implement
return Response(status=status.HTTP_405_METHOD_NOT_ALLOWED)
def create(self, request, *args, **kwargs):
serializer = self.serializer_class(data=request.data)
if serializer.is_valid():
try:
with transaction.atomic():
serializer.save(owner=self.request.user)
except IntegrityError:
content = {'code': 'integrity_error'}
return Response(content, status=status.HTTP_400_BAD_REQUEST)
return Response({}, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
def list(self, request):
queryset = self.get_queryset()
serializer = self.serializer_class(queryset, context={'request': request}, many=True)
return Response(serializer.data)
class CollectionItemViewSet(BaseViewSet):
allowed_methods = ['GET', 'POST']
permission_classes = BaseViewSet.permission_classes
queryset = CollectionItem.objects.all()
serializer_class = CollectionItemSerializer
pagination_class = paginators.LinkHeaderPagination
lookup_field = 'uid'
def get_serializer_class(self):
if self.request.method == 'GET' and self.request.query_params.get('prefer_inline'):
return CollectionItemInlineSerializer
return super().get_serializer_class()
def get_queryset(self):
collection_uid = self.kwargs['collection_uid']
try:
collection = self.get_collection_queryset(Collection.objects).get(uid=collection_uid)
except Collection.DoesNotExist:
raise Http404("Collection does not exist")
# XXX Potentially add this for performance: .prefetch_related('snapshots__chunks')
queryset = type(self).queryset.filter(collection__pk=collection.pk)
return queryset
def create(self, request, collection_uid=None):
collection_object = self.get_collection_queryset(Collection.objects).get(uid=collection_uid)
many = isinstance(request.data, list)
serializer = self.serializer_class(data=request.data, many=many)
if serializer.is_valid():
try:
serializer.save(collection=collection_object)
except IntegrityError:
content = {'code': 'integrity_error'}
return Response(content, status=status.HTTP_400_BAD_REQUEST)
return Response({}, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
def destroy(self, request, collection_uid=None, uid=None):
# FIXME: implement
return Response(status=status.HTTP_405_METHOD_NOT_ALLOWED)
def update(self, request, collection_uid=None, uid=None):
# FIXME: implement, or should it be implemented elsewhere?
return Response(status=status.HTTP_405_METHOD_NOT_ALLOWED)
def partial_update(self, request, collection_uid=None, uid=None):
# FIXME: implement, or should it be implemented elsewhere?
return Response(status=status.HTTP_405_METHOD_NOT_ALLOWED)
@action_decorator(detail=True, methods=['GET'])
def snapshots(self, request, collection_uid=None, uid=None):
col = get_object_or_404(Collection.objects, uid=collection_uid)
col_it = get_object_or_404(col.items, uid=uid)
serializer = CollectionItemSnapshotSerializer(col_it.snapshots.order_by('-id'), many=True)
return Response(serializer.data)
class CollectionItemChunkViewSet(viewsets.ViewSet):
allowed_methods = ['GET', 'POST']
parser_classes = (parsers.MultiPartParser, )
authentication_classes = BaseViewSet.authentication_classes
permission_classes = BaseViewSet.permission_classes
serializer_class = CollectionItemChunkSerializer
lookup_field = 'uid'
def get_collection_queryset(self, queryset=Collection.objects):
return queryset.all()
def create(self, request, collection_uid=None, collection_item_uid=None):
col = get_object_or_404(self.get_collection_queryset(), uid=collection_uid)
col_it = get_object_or_404(col.items, uid=collection_item_uid)
serializer = self.serializer_class(data=request.data)
if serializer.is_valid():
try:
# FIXME: actually generate the correct order value. Or alternatively have it null at first and only set it when ommitting to a snapshot
serializer.save(item=col_it, order='abc')
except IntegrityError:
content = {'code': 'integrity_error'}
return Response(content, status=status.HTTP_400_BAD_REQUEST)
return Response({}, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
@action_decorator(detail=True, methods=['GET'])
def download(self, request, collection_uid=None, collection_item_uid=None, uid=None):
import os
from django.views.static import serve
col = get_object_or_404(self.get_collection_queryset(), uid=collection_uid)
col_it = get_object_or_404(col.items, uid=collection_item_uid)
chunk = get_object_or_404(col_it.chunks, uid=uid)
filename = chunk.chunkFile.path
dirname = os.path.dirname(filename)
basename = os.path.basename(filename)
# FIXME: DO NOT USE! Use django-send file or etc instead.
return serve(request, basename, dirname)