add bitcoin shop config and payment method enablement

backend/src/validation/decorators/isEnabledPaymentMethods.spec.ts

@@ -0,0 +1,35 @@
+import { validateSync } from 'class-validator';
+import { IsEnabledPaymentMethods } from './isEnabledPaymentMethods';
+
+class TestDto {
+    @IsEnabledPaymentMethods()
+    PAYMENT_METHODS_ENABLED: string;
+}
+
+const validateMethods = (value: string) => {
+    const dto = Object.assign(new TestDto(), { PAYMENT_METHODS_ENABLED: value });
+
+    return validateSync(dto);
+};
+
+describe('IsEnabledPaymentMethods', () => {
+    it('accepts xmr only', () => {
+        expect(validateMethods('xmr')).toHaveLength(0);
+    });
+
+    it('accepts xmr and btc', () => {
+        expect(validateMethods('xmr,btc')).toHaveLength(0);
+    });
+
+    it('rejects empty string', () => {
+        expect(validateMethods('').length).toBeGreaterThan(0);
+    });
+
+    it('rejects unsupported methods', () => {
+        expect(validateMethods('eth').length).toBeGreaterThan(0);
+    });
+
+    it('rejects duplicate methods', () => {
+        expect(validateMethods('xmr,xmr').length).toBeGreaterThan(0);
+    });
+});

backend/src/validation/decorators/isEnabledPaymentMethods.ts

@@ -0,0 +1,32 @@
+import { Validate, ValidatorConstraint, type ValidatorConstraintInterface } from 'class-validator';
+import { isPaymentMethodValue } from '../../utils/payment/isPaymentMethodValue';
+
+@ValidatorConstraint({ name: 'isEnabledPaymentMethods' })
+class IsEnabledPaymentMethodsConstraint implements ValidatorConstraintInterface {
+    validate(value: unknown): boolean {
+        if (typeof value !== 'string' || !value.trim()) {
+            return false;
+        }
+
+        const tokens = value
+            .split(',')
+            .map(token => token.trim())
+            .filter(Boolean);
+
+        if (tokens.length === 0) {
+            return false;
+        }
+
+        if (new Set(tokens).size !== tokens.length) {
+            return false;
+        }
+
+        return tokens.every(isPaymentMethodValue);
+    }
+
+    defaultMessage(): string {
+        return '$property must be a comma-separated list of supported payment methods without duplicates';
+    }
+}
+
+export const IsEnabledPaymentMethods = () => Validate(IsEnabledPaymentMethodsConstraint);