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from django.http import Http404 |
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from django.db.models import Prefetch, Q |
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from rest_framework import viewsets, decorators, status, mixins |
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from rest_framework.response import Response |
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from rest_framework.permissions import IsAuthenticated |
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from rest_framework.filters import BaseFilterBackend |
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from dry_rest_permissions.generics import DRYPermissions |
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from sigma_core.models.user import User |
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from sigma_chat.models.chat_member import ChatMember |
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from sigma_chat.serializers.chat_member import ChatMemberSerializer |
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from sigma_chat.models.chat import Chat |
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from sigma_chat.models.message import Message |
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from sigma_chat.serializers.message import MessageSerializer |
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class ChatMemberFilterBackend(BaseFilterBackend): |
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filter_q = { |
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'user': lambda u: Q(user=u), |
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'chat': lambda c: Q(chat=c) |
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} |
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def filter_queryset(self, request, queryset, view): |
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""" |
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Limits all list requests w.r.t the Normal Rules of Visibility. |
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""" |
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user_chat_ids = request.user.user_chatmember.filter(is_member=True).values_list('chat_id', flat=True) |
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# I can see a ChatMember if and only I am member of the chat |
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queryset = queryset.prefetch_related( |
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Prefetch('user', queryset=ChatMember.objects.filter(is_member=True)) |
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).filter(Q(user_id=request.user.id) | Q(chat_id__in=user_chat_ids) |
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) |
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for (param, q) in self.filter_q.items(): |
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x = request.query_params.get(param, None) |
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if x is not None: |
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queryset = queryset.filter(q(x)) |
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return queryset.distinct() |
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class ChatMemberViewSet(viewsets.ModelViewSet): |
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queryset = ChatMember.objects.select_related('chat', 'user') |
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serializer_class = ChatMemberSerializer |
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permission_classes = [IsAuthenticated, DRYPermissions] |
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filter_backends = (ChatMemberFilterBackend, ) |
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def list(self, request): |
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""" |
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--- |
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parameters_strategy: |
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query: replace |
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parameters: |
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- name: user |
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type: integer |
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paramType: query |
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- name: chat |
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type: integer |
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paramType: query |
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""" |
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return super().list(request) |
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def create(self, request): |
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return Response("You're not authorized to create a new ChatMember this way, please use the website.", status=status.HTTP_403_FORBIDDEN) |
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def update(self, request, pk=None): |
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return Response("You're not authorized to update a new ChatMember this way, please use the website.", status=status.HTTP_403_FORBIDDEN) |
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@decorators.detail_route(methods=['post']) |
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def send_message(self, request, pk=None): |
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""" |
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Send a message for the ChatMember pk. |
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--- |
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omit_serializer: true |
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parameters_strategy: |
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form: replace |
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parameters: |
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- name: text |
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type: string |
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required: false |
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- name: attachments |
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type: string |
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required: false |
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""" |
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try: |
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chatmember = ChatMember.objects.get(pk=pk) |
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if not chatmember.is_member or chatmember.user != request.user : |
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return Response(status=status.HTTP_403_FORBIDDEN) |
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request.data['chat_id'] = chatmember.chat.id |
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request.data['chatmember_id'] = chatmember.id |
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message = MessageSerializer(data=request.data) |
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if message.is_valid(): |
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message.save() |
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return Response(message.data, status=status.HTTP_201_CREATED) |
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else: |
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return Response(message.errors, status=status.HTTP_400_BAD_REQUEST) |
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except ChatMember.DoesNotExist: |
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raise Http404("ChatMember {0} not found".format(request.data.get('chatmember_id', None))) |
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return False |
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ProjetSigma /
backend
