Allow paying for Donations and Consumables with Protocoin

apiserver/apiserver/api/views.py

@@ -1150,6 +1150,71 @@ class InterestViewSet(Base, Retrieve, Create):
 
 
 class ProtocoinViewSet(Base):
+    @action(detail=False, methods=['post'], permission_classes=[AllowMetadata | IsAuthenticated])
+    def spend_request(self, request):
+        try:
+            with transaction.atomic():
+                source_user = self.request.user
+                source_member = source_user.member
+
+                try:
+                    balance = float(request.data['balance'])
+                except KeyError:
+                    raise exceptions.ValidationError(dict(balance='This field is required.'))
+                except ValueError:
+                    raise exceptions.ValidationError(dict(balance='Invalid number.'))
+
+                try:
+                    amount = float(request.data['amount'])
+                except KeyError:
+                    raise exceptions.ValidationError(dict(amount='This field is required.'))
+                except ValueError:
+                    raise exceptions.ValidationError(dict(amount='Invalid number.'))
+
+                try:
+                    category = str(request.data['category'])
+                except KeyError:
+                    raise exceptions.ValidationError(dict(category='This field is required.'))
+                if category not in ['Consumables', 'Donation']:
+                    raise exceptions.ValidationError(dict(category='Invalid category.'))
+
+                memo = str(request.data.get('memo', ''))
+
+                # also prevents negative spending
+                if amount < 0.25:
+                    raise exceptions.ValidationError(dict(amount='Amount too small.'))
+
+                source_user_balance = source_user.transactions.aggregate(Sum('protocoin'))['protocoin__sum'] or 0
+                source_user_balance = float(source_user_balance)
+
+                if abs(source_user_balance - balance) > 0.01:  # stupid https://docs.djangoproject.com/en/4.2/ref/databases/#decimal-handling
+                    raise exceptions.ValidationError(dict(balance='Incorrect current balance.'))
+
+                if source_user_balance < amount:
+                    raise exceptions.ValidationError(dict(amount='Insufficient funds.'))
+
+                tx_memo = 'Protocoin - Transaction spent ₱ {} on {}{}'.format(
+                    amount,
+                    category,
+                    ', memo: ' + memo if memo else ''
+                )
+
+                tx = models.Transaction.objects.create(
+                    user=source_user,
+                    protocoin=-amount,
+                    amount=0,
+                    number_of_membership_months=0,
+                    account_type='Protocoin',
+                    category=category,
+                    info_source='System',
+                    memo=tx_memo,
+                )
+                utils.log_transaction(tx)
+
+                return Response(200)
+        except OperationalError:
+            self.spend_request(request)
+
     @action(detail=False, methods=['post'], permission_classes=[AllowMetadata | IsAuthenticated])
     def send_to_member(self, request):
         try:
@@ -1178,6 +1243,7 @@ class ProtocoinViewSet(Base):
                 except ValueError:
                     raise exceptions.ValidationError(dict(amount='Invalid number.'))
 
+                # also prevents negative spending
                 if amount < 1.00:
                     raise exceptions.ValidationError(dict(amount='Amount too small.'))
 
@@ -1318,6 +1384,7 @@ class ProtocoinViewSet(Base):
                 except ValueError:
                     raise exceptions.ValidationError(dict(amount='Invalid number.'))
 
+                # also prevents negative spending
                 if amount < 0.25:
                     raise exceptions.ValidationError(dict(amount='Amount too small.'))
 

webclient/src/Paymaster.js

@@ -6,6 +6,44 @@ import { PayPalPayNow, PayPalSubscribe } from './PayPal.js';
 import { MembersDropdown } from './Members.js';
 import { requester } from './utils.js';
 
+export function PayWithProtocoin(props) {
+	const { token, user, refreshUser, amount, setAmount, custom } = props;
+	const member = user.member;
+	const [error, setError] = useState({});
+	const [loading, setLoading] = useState(false);
+	const [success, setSuccess] = useState(false);
+
+	const handleSubmit = (e) => {
+		if (loading) return;
+		setSuccess(false);
+		setLoading(true);
+
+		const data = { amount: amount, ...custom, balance: member.protocoin };
+		requester('/protocoin/spend_request/', 'POST', token, data)
+		.then(res => {
+			setLoading(false);
+			setSuccess(true);
+			setAmount('');
+			setError({});
+			refreshUser();
+		})
+		.catch(err => {
+			setLoading(false);
+			console.log(err);
+			setError(err.data);
+		});
+	};
+
+	return (
+		<Form onSubmit={handleSubmit}>
+			<Form.Button disabled={!amount} color='green' loading={loading} error={error.amount}>
+				Pay with Protocoin
+			</Form.Button>
+			{success && <div>Success!</div>}
+		</Form>
+	);
+};
+
 export function SendProtocoin(props) {
 	const { token, user, refreshUser } = props;
 	const member = user.member;
@@ -76,10 +114,10 @@ export function Paymaster(props) {
 	const { token, user, refreshUser } = props;
 	const [pop, setPop] = useState('20.00');
 	const [locker, setLocker] = useState('5.00');
-	const [consumables, setConsumables] = useState('20.00');
+	const [consumables, setConsumables] = useState('');
 	const [buyProtocoin, setBuyProtocoin] = useState('10.00');
 	const [consumablesMemo, setConsumablesMemo] = useState('');
-	const [donate, setDonate] = useState('20.00');
+	const [donate, setDonate] = useState('');
 	const [memo, setMemo] = useState('');
 
 	const monthly_fees = user.member.monthly_fees || 55;
@@ -188,6 +226,15 @@ export function Paymaster(props) {
 						name='Protospace Consumables'
 						custom={JSON.stringify({ category: 'Consumables', member: user.member.id, memo: consumablesMemo })}
 					/>
+
+					<p/>
+
+					<PayWithProtocoin
+						token={token} user={user} refreshUser={refreshUser}
+						amount={consumables}
+						setAmount={setConsumables}
+						custom={{ category: 'Consumables', memo: consumablesMemo }}
+					/>
 				</Grid.Column>
 			</Grid>
 
@@ -221,6 +268,15 @@ export function Paymaster(props) {
 						name='Protospace Donation'
 						custom={JSON.stringify({ category: 'Donation', member: user.member.id, memo: memo })}
 					/>
+
+					<p/>
+
+					<PayWithProtocoin
+						token={token} user={user} refreshUser={refreshUser}
+						amount={donate}
+						setAmount={setDonate}
+						custom={{ category: 'Donation', memo: memo }}
+					/>
 				</Grid.Column>
 			</Grid>