application deposit with currency

apps/gooyal_oauth2/models.py

@@ -22,7 +22,7 @@ class AccessToken(AbstractAccessToken):
 class Application(AbstractApplication):
     id = None
     uuid = models.UUIDField(primary_key=True, editable=False, default=uuid.uuid4, unique=True, db_index=True)
-    balance = models.BigIntegerField(_('balance'), default=0)
+    balance = models.BigIntegerField(_('balance'), default=0)  # todo: remove it
 
     class Meta:
         abstract = False

apps/wallet/models.py

@@ -3,10 +3,11 @@ from django.db import models
 from django.db import transaction
 from django.db.models import F
 from django.utils.translation import gettext_lazy as _
-from rest_framework.exceptions import APIException, NotAcceptable
+from rest_framework.exceptions import APIException
 from django.conf import settings
 from oauth2_provider import settings as oauth2_settings
 
+from utils.exceptions import UnprocessableEntity
 from gooyal_accounts_client.models import PublicUser
 from utils.accounts_client import get_user_details, get_application_details
 from utils.models import BaseModel
@@ -15,6 +16,10 @@ from apps.users.models import User
 from ..gooyal_oauth2.models import Application
 
 
+class CurrencyChoices(models.TextChoices):
+    IRANIAN_RIAL = '166ab7ce33b34799950d45035a9997d6', _('IRANIAN RIAL')  # uuid without dash
+
+
 class WalletQuerySet(models.QuerySet):
     pass
 
@@ -40,8 +45,8 @@ class CategoryQuerySet(models.QuerySet):
 
 class Category(BaseModel):
     application = models.ForeignKey(oauth2_settings.APPLICATION_MODEL, on_delete=models.PROTECT, null=True)
-
     label = models.CharField(_('label'), max_length=255)
+    currency = models.UUIDField(choices=CurrencyChoices.choices, db_index=True, default=CurrencyChoices.IRANIAN_RIAL)
 
     objects = CategoryQuerySet.as_manager()
 
@@ -120,6 +125,14 @@ class Transaction(BaseModel):
     def get_payee(self):
         return self.payee_wallet.get_owner()
 
+    @property
+    def payer_wallet_category(self):
+        return self.payer_wallet and self.payer_wallet.category_id
+
+    @property
+    def payee_wallet_category(self):
+        return self.payee_wallet and self.payee_wallet.category_id
+
     @property
     def payer_id(self):
         return self.payer_wallet.owner_uuid
@@ -154,7 +167,7 @@ class Transaction(BaseModel):
         payer_is_allowed_negative_balance = self.payer_wallet.owner_type == TypeChoices.APPLICATION.value and str(
             self.payer_wallet.owner_uuid) in settings.ALLOWED_NEGATIVE_BALANCE_APPLICATIONS
         if self.amount > self.payer_wallet.balance and not payer_is_allowed_negative_balance:
-            raise APIException('not enough balance')
+            raise UnprocessableEntity('not enough balance')
         self.payer_wallet.balance = F('balance') - self.amount
         self.payer_wallet.save(update_fields=['balance'])
 
@@ -224,6 +237,10 @@ class Transaction(BaseModel):
         if not self.payee_wallet:
             raise APIException('payee identification error')
 
+        if not self.payer_wallet.category == self.payee_wallet.category:
+            self.change_state(from_state=self.state, to_state=StateChoices.FAILED)
+            raise APIException('payer and payee wallet currency not equal')
+
         if not self.state == StateChoices.CREATED:
             raise APIException('this transaction is not ready to pay')
 

apps/wallet/serializers.py

@@ -174,8 +174,10 @@ class ApplicationTransactionSerializer(BaseTransactionSerializer):
     pass
 
 class ApplicationDepositSerializer(serializers.ModelSerializer):
+    uuid = serializers.UUIDField(required=False, allow_null=None)
     payee_id = serializers.UUIDField(required=True)
     payee_type = serializers.IntegerField(required=True)
+    payee_wallet_category = serializers.UUIDField(required=True)
     amount = serializers.IntegerField(required=True, validators=[MinValueValidator(1)])
     # TODO: details as fields
 
@@ -185,8 +187,10 @@ class ApplicationDepositSerializer(serializers.ModelSerializer):
             'uuid',
             'payer_id',
             'payer_type',
+            'payer_wallet_category',
             'payee_id',
             'payee_type',
+            'payee_wallet_category',
             "created_at",
             "state",
             'amount',
@@ -195,7 +199,7 @@ class ApplicationDepositSerializer(serializers.ModelSerializer):
             'details',
         )
 
-        read_only_fields = ['updated_at', 'state', 'created_at', 'payer_id', 'payer_type']
+        read_only_fields = ['updated_at', 'state', 'created_at', 'payer_id', 'payer_type', 'payer_wallet_category']
 
 
 class ApplicationWithdrawSerializer(serializers.ModelSerializer):

apps/wallet/views/application.py

@@ -13,6 +13,7 @@ from apps.wallet.constans import TypeChoices, StateChoices
 from apps.wallet.models import Transaction, Category, Wallet
 from apps.wallet.serializers import ApplicationDepositSerializer, ApplicationWithdrawSerializer, \
     ApplicationTransactionSerializer, ApplicationBalanceSerializer, MyWalletSerializer
+from utils.exceptions import UnprocessableEntity
 
 logger = logging.getLogger(__name__)
 
@@ -277,16 +278,26 @@ class CategoryDepositSubmitAPIView(generics.CreateAPIView):
         # TODO: get_or_create instead of create if uuid given
         # TODO: it is possible to merage create and submit in one step for improve performance
         application = get_application(self.request)
-        category_uuid = self.kwargs.get('category_uuid')
+        payee_wallet_category_uuid = serializer.validated_data.pop('payee_wallet_category')
-        if category_uuid:
+        payee_wallet_category_uuid = payee_wallet_category_uuid and str(payee_wallet_category_uuid)
-            category = get_object_or_404(Category.objects.all(), uuid=category_uuid)
+
+        payer_wallet_category_uuid = self.kwargs.get('category_uuid')
+
+        if payer_wallet_category_uuid:
+            payer_wallet_category = get_object_or_404(Category.objects.all(), uuid=payer_wallet_category_uuid)
         else:
-            category = None
+            payer_wallet_category = None
+
+        payee_wallet_category = get_object_or_404(Category.objects.all(), uuid=payee_wallet_category_uuid)
+
+        if not(payee_wallet_category and payee_wallet_category.currency == payer_wallet_category.currency):
+            raise UnprocessableEntity('payer and payee wallet currency not equal')
+
         payee_id = serializer.validated_data.pop('payee_id')
         payee_type = serializer.validated_data.pop('payee_type')
         payer_wallet, _ = Wallet.objects.get_or_create(owner_uuid=application.uuid, owner_type=TypeChoices.APPLICATION,
-                                              category=category)
+                                              category=payer_wallet_category)
-        payee_wallet, _ = Wallet.objects.get_or_create(owner_uuid=payee_id, owner_type=payee_type, category=category)
+        payee_wallet, _ = Wallet.objects.get_or_create(owner_uuid=payee_id, owner_type=payee_type, category=payee_wallet_category)
 
         instance = serializer.save(payer_wallet=payer_wallet, application=application, payee_wallet=payee_wallet)
         instance.category_submit()
@@ -371,7 +382,7 @@ class CategoryWithdrawVerifyAPIView(generics.RetrieveAPIView):
     def retrieve(self, request, *args, **kwargs):
         instance = self.get_object()
         if instance.state == StateChoices.PENDING:
-            instance.category_verify()
+            instance.verify()
 
         serializer = self.get_serializer(instance)
         return Response(serializer.data)

utils/exceptions.py

@@ -2,6 +2,7 @@ import logging
 
 from rest_framework.exceptions import APIException
 from rest_framework.views import exception_handler as drf_exception_handler
+from django.utils.translation import gettext_lazy as _
 
 logger = logging.getLogger(__name__)
 
@@ -52,3 +53,8 @@ class ErrorMiddleware:
             },
             status=500
         )
+
+class UnprocessableEntity(APIException):
+    status_code = 422
+    default_detail = _('The request was well-formed but cannot be processed due to semantic errors.')
+    default_code = _('unprocessable_entity')

wallet/settings.py

@@ -262,4 +262,5 @@ CACHES = {
     }
 }
 
-ALLOWED_NEGATIVE_BALANCE_APPLICATIONS = config('ALLOWED_NEGATIVE_BALANCE_APPLICATIONS', cast=lambda v: [s.strip() for s in v.split(',')])
+ALLOWED_NEGATIVE_BALANCE_APPLICATIONS = config('ALLOWED_NEGATIVE_BALANCE_APPLICATIONS', cast=lambda v: [s.strip() for s in v.split(',')])
+DEFAULT_WALLET_CATEGORY_UUID = 'af7d967f-30c0-409b-9066-2549f2da5e5e'