Added support for 13/19 digits VISA credit cards in PaymentCardNumber…

… type (pydantic#2286)

* Added support for 13/19 digits VISA credit cards

* Added changes md-file

* Fixed tests VALID_VISA_19 length, changed constants order

* tiny tweaks

Co-authored-by: Alexander Plaxin <a.plaxin@qiwi.com>
Co-authored-by: Samuel Colvin <samcolvin@gmail.com>

changes/1416-AlexanderSov.md

@@ -0,0 +1 @@
+Added support for 13/19 digits VISA credit cards in `PaymentCardNumber` type

pydantic/types.py

@@ -903,10 +903,13 @@ def validate_length_for_brand(cls, card_number: 'PaymentCardNumber') -> 'Payment
         Validate length based on BIN for major brands:
         https://en.wikipedia.org/wiki/Payment_card_number#Issuer_identification_number_(IIN)
         """
-        required_length: Optional[int] = None
-        if card_number.brand in {PaymentCardBrand.visa, PaymentCardBrand.mastercard}:
+        required_length: Union[None, int, str] = None
+        if card_number.brand in PaymentCardBrand.mastercard:
             required_length = 16
             valid = len(card_number) == required_length
+        elif card_number.brand == PaymentCardBrand.visa:
+            required_length = '13, 16 or 19'
+            valid = len(card_number) in {13, 16, 19}
         elif card_number.brand == PaymentCardBrand.amex:
             required_length = 15
             valid = len(card_number) == required_length

tests/test_types_payment_card_number.py

@@ -9,7 +9,9 @@
 
 VALID_AMEX = '370000000000002'
 VALID_MC = '5100000000000003'
-VALID_VISA = '4050000000000001'
+VALID_VISA_13 = '4050000000001'
+VALID_VISA_16 = '4050000000000001'
+VALID_VISA_19 = '4050000000000000001'
 VALID_OTHER = '2000000000000000008'
 LUHN_INVALID = '4000000000000000'
 LEN_INVALID = '40000000000000006'
@@ -73,7 +75,9 @@ def test_validate_luhn_check_digit(card_number: str, valid: bool):
 @pytest.mark.parametrize(
     'card_number, brand, valid',
     [
-        (VALID_VISA, PaymentCardBrand.visa, True),
+        (VALID_VISA_13, PaymentCardBrand.visa, True),
+        (VALID_VISA_16, PaymentCardBrand.visa, True),
+        (VALID_VISA_19, PaymentCardBrand.visa, True),
         (VALID_MC, PaymentCardBrand.mastercard, True),
         (VALID_AMEX, PaymentCardBrand.amex, True),
         (VALID_OTHER, PaymentCardBrand.other, True),
@@ -95,7 +99,7 @@ def test_length_for_brand(card_number: str, brand: PaymentCardBrand, valid: bool
     [
         (VALID_AMEX, PaymentCardBrand.amex),
         (VALID_MC, PaymentCardBrand.mastercard),
-        (VALID_VISA, PaymentCardBrand.visa),
+        (VALID_VISA_16, PaymentCardBrand.visa),
         (VALID_OTHER, PaymentCardBrand.other),
     ],
 )
@@ -104,8 +108,8 @@ def test_get_brand(card_number: str, brand: PaymentCardBrand):
 
 
 def test_valid():
-    card = PaymentCard(card_number=VALID_VISA)
-    assert str(card.card_number) == VALID_VISA
+    card = PaymentCard(card_number=VALID_VISA_16)
+    assert str(card.card_number) == VALID_VISA_16
     assert card.card_number.masked == '405000******0001'