feat: 站内信 (#6183)

* 添加站内信

* s

* s

* 添加接口

* fix

* fix

* 重构了一些

* 完成

* 完善

* s

* s

* s

* s

* s

* s

* 测试ok

* 替换业务中发送消息的方式

* 修改

* s

* 去掉 update 兼容 create

* 添加 unread total 接口

* 调整json字段

Co-authored-by: xinwen <coderWen@126.com>

apps/notifications/api/notifications.py

@@ -0,0 +1,72 @@
+from django.http import Http404
+from rest_framework.mixins import ListModelMixin, UpdateModelMixin
+from rest_framework.views import APIView
+from rest_framework.response import Response
+from rest_framework import status
+
+from common.drf.api import JmsGenericViewSet
+from notifications.notifications import system_msgs
+from notifications.models import SystemMsgSubscription
+from notifications.backends import BACKEND
+from notifications.serializers import (
+    SystemMsgSubscriptionSerializer, SystemMsgSubscriptionByCategorySerializer
+)
+
+__all__ = ('BackendListView', 'SystemMsgSubscriptionViewSet')
+
+
+class BackendListView(APIView):
+    def get(self, request):
+        data = [
+            {
+                'name': backend,
+                'name_display': backend.label
+            }
+            for backend in BACKEND
+            if backend.is_enable
+        ]
+        return Response(data=data)
+
+
+class SystemMsgSubscriptionViewSet(ListModelMixin,
+                                   UpdateModelMixin,
+                                   JmsGenericViewSet):
+    lookup_field = 'message_type'
+    queryset = SystemMsgSubscription.objects.all()
+    serializer_classes = {
+        'list': SystemMsgSubscriptionByCategorySerializer,
+        'update': SystemMsgSubscriptionSerializer,
+        'partial_update': SystemMsgSubscriptionSerializer
+    }
+
+    def list(self, request, *args, **kwargs):
+        data = []
+        category_children_mapper = {}
+
+        subscriptions = self.get_queryset()
+        msgtype_sub_mapper = {}
+        for sub in subscriptions:
+            msgtype_sub_mapper[sub.message_type] = sub
+
+        for msg in system_msgs:
+            message_type = msg['message_type']
+            message_type_label = msg['message_type_label']
+            category = msg['category']
+            category_label = msg['category_label']
+
+            if category not in category_children_mapper:
+                children = []
+
+                data.append({
+                    'category': category,
+                    'category_label': category_label,
+                    'children': children
+                })
+                category_children_mapper[category] = children
+
+            sub = msgtype_sub_mapper[message_type]
+            sub.message_type_label = message_type_label
+            category_children_mapper[category].append(sub)
+
+        serializer = self.get_serializer(data, many=True)
+        return Response(data=serializer.data)