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# -*- coding: utf-8 -*-
#
from rest_framework import generics
from rest_framework.serializers import Serializer
from common.permissions import IsValidUser
from common.utils import get_logger
from .. import serializers
from ..models import Preference
logger = get_logger(__file__)
class PreferenceApi(generics.RetrieveUpdateAPIView):
permission_classes = (IsValidUser,)
queryset = Preference.objects.all()
serializer_class_mapper = {
'lina': serializers.LinaSerializer,
'luna': serializers.LunaSerializer,
'koko': serializers.KokoSerializer,
}
def check_permissions(self, request):
if self.category not in self.serializer_class_mapper:
return self.permission_denied(request, 'category is invalid')
return super().check_permissions(request)
@property
def user(self):
return self.request.user
@property
def category(self):
return self.request.query_params.get('category')
def get_serializer_class(self):
cls = self.serializer_class_mapper.get(self.category)
return cls
def get_field_defaults(self, serializer):
field_defaults = {}
fields = serializer.get_fields()
for name, field in fields.items():
if isinstance(field, Serializer):
field_defaults[name] = self.get_field_defaults(field)
continue
field_defaults[name] = getattr(field, 'default', None)
return field_defaults
def get_encrypted_fields(self, serializer):
encrypted_fields = []
fields = serializer.get_fields()
for name, field in fields.items():
if isinstance(field, Serializer):
encrypted_fields += self.get_encrypted_fields(field)
continue
if not field.write_only:
continue
encrypted_fields.append(name)
return encrypted_fields
def get_object(self):
serializer = self.get_serializer_class()()
field_defaults = self.get_field_defaults(serializer)
qs = self.queryset.filter(user=self.user, category=self.category)
if not qs.exists():
return field_defaults
data = dict(qs.values_list('name', 'value'))
for k, v in data.items():
for d in field_defaults.values():
if k in d:
d[k] = v
break
return field_defaults
def perform_update(self, serializer):
user = self.user
category = self.category
model = self.queryset.model
encrypted_fields = self.get_encrypted_fields(serializer)
data = serializer.validated_data
for d in data.values():
for name, value in d.items():
kwargs = {'name': name, 'user': user}
defaults = {'category': category}
if name in encrypted_fields:
value = model.encrypt(value)
defaults['encrypted'] = True
defaults['value'] = value
defaults.update(kwargs)
model.objects.update_or_create(defaults, **kwargs)