test_payment.py

from decimal import Decimal
from unittest.mock import Mock, patch

import pytest

from saleor.payment import (
    ChargeStatus,
    GatewayError,
    PaymentError,
    TransactionKind,
    gateway,
)
from saleor.payment.interface import CreditCardInfo, GatewayConfig, GatewayResponse
from saleor.payment.models import Payment
from saleor.payment.utils import (
    ALLOWED_GATEWAY_KINDS,
    clean_authorize,
    clean_capture,
    create_payment,
    create_payment_information,
    create_transaction,
    validate_gateway_response,
)

NOT_ACTIVE_PAYMENT_ERROR = "This payment is no longer active."
EXAMPLE_ERROR = "Example dummy error"


@pytest.fixture
def card_details():
    return CreditCardInfo(
        last_4="1234", exp_year=2020, exp_month=8, brand="visa", name_on_card="Joe Doe"
    )


@pytest.fixture
def gateway_response(settings, card_details):
    return GatewayResponse(
        is_success=True,
        action_required=False,
        transaction_id="transaction-token",
        amount=Decimal(14.50),
        currency=settings.DEFAULT_CURRENCY,
        kind=TransactionKind.CAPTURE,
        error=None,
        raw_response={
            "credit_card_four": "1234",
            "transaction-id": "transaction-token",
        },
        card_info=card_details,
    )


@pytest.fixture
def transaction_data(payment_dummy, gateway_response):
    return {
        "payment": payment_dummy,
        "payment_information": create_payment_information(
            payment_dummy, "payment-token"
        ),
        "kind": TransactionKind.CAPTURE,
        "gateway_response": gateway_response,
    }


@pytest.fixture
def gateway_config():
    return GatewayConfig(
        gateway_name="Dummy",
        auto_capture=True,
        template_path="template.html",
        connection_params={"secret-key": "nobodylikesspanishinqusition"},
    )


@pytest.fixture
def transaction_token():
    return "transaction-token"


@pytest.fixture
def dummy_response(payment_dummy, transaction_data, transaction_token, card_details):
    return GatewayResponse(
        is_success=True,
        action_required=False,
        transaction_id=transaction_token,
        error=EXAMPLE_ERROR,
        amount=payment_dummy.total,
        currency=payment_dummy.currency,
        kind=TransactionKind.AUTH,
        raw_response=None,
        card_info=card_details,
    )


def test_create_payment(address, settings):
    data = {
        "gateway": "Dummy",
        "payment_token": "token",
        "total": 10,
        "currency": settings.DEFAULT_CURRENCY,
        "email": "test@example.com",
        "billing_address": address,
        "customer_ip_address": "127.0.0.1",
    }
    payment = create_payment(**data)
    assert payment.gateway == "Dummy"

    same_payment = create_payment(**data)
    assert payment == same_payment


def test_create_transaction(transaction_data):
    txn = create_transaction(**transaction_data)

    assert txn.payment == transaction_data["payment"]
    gateway_response = transaction_data["gateway_response"]
    assert txn.kind == gateway_response.kind
    assert txn.amount == gateway_response.amount
    assert txn.currency == gateway_response.currency
    assert txn.token == gateway_response.transaction_id
    assert txn.is_success == gateway_response.is_success
    assert txn.gateway_response == gateway_response.raw_response


def test_create_transaction_no_gateway_response(transaction_data):
    transaction_data.pop("gateway_response")
    txn = create_transaction(**transaction_data)
    assert txn.gateway_response == {}


@pytest.mark.parametrize(
    "func",
    [gateway.authorize, gateway.capture, gateway.confirm, gateway.refund, gateway.void],
)
def test_payment_needs_to_be_active_for_any_action(func, payment_dummy):
    payment_dummy.is_active = False
    with pytest.raises(PaymentError) as exc:
        func(payment_dummy, "token")
    assert exc.value.message == NOT_ACTIVE_PAYMENT_ERROR


@patch("saleor.order.actions.handle_fully_paid_order")
def test_gateway_charge_failed(
    mock_handle_fully_paid_order, mock_get_manager, payment_txn_preauth, dummy_response
):
    txn = payment_txn_preauth.transactions.first()
    txn.is_success = False

    payment = payment_txn_preauth
    amount = payment.total

    dummy_response.is_success = False
    dummy_response.kind = TransactionKind.CAPTURE
    mock_get_manager.capture_payment.return_value = dummy_response
    with pytest.raises(PaymentError):
        gateway.capture(payment, amount)
    mock_get_manager.capture_payment.assert_called_once()
    payment.refresh_from_db()
    assert payment.charge_status == ChargeStatus.NOT_CHARGED
    assert not payment.captured_amount
    assert not mock_handle_fully_paid_order.called


def test_gateway_charge_errors(payment_dummy, transaction_token, settings):
    payment = payment_dummy
    gateway.authorize(payment, transaction_token)
    with pytest.raises(PaymentError) as exc:
        gateway.capture(payment, Decimal("0"))
    assert exc.value.message == "Amount should be a positive number."

    payment.charge_status = ChargeStatus.FULLY_REFUNDED
    with pytest.raises(PaymentError) as exc:
        gateway.capture(payment, Decimal("10"))
    assert exc.value.message == "This payment cannot be captured."

    payment.charge_status = ChargeStatus.NOT_CHARGED
    with pytest.raises(PaymentError) as exc:
        gateway.capture(payment, Decimal("1000000"))
    assert exc.value.message == ("Unable to charge more than un-captured amount.")


def test_gateway_refund_errors(payment_txn_captured):
    payment = payment_txn_captured
    with pytest.raises(PaymentError) as exc:
        gateway.refund(payment, Decimal("1000000"))
    assert exc.value.message == "Cannot refund more than captured"

    with pytest.raises(PaymentError) as exc:
        gateway.refund(payment, Decimal("0"))
    assert exc.value.message == "Amount should be a positive number."

    payment.charge_status = ChargeStatus.NOT_CHARGED
    with pytest.raises(PaymentError) as exc:
        gateway.refund(payment, Decimal("1"))
    assert exc.value.message == "This payment cannot be refunded."


def test_clean_authorize():
    payment = Mock(can_authorize=Mock(return_value=True))
    clean_authorize(payment)

    payment = Mock(can_authorize=Mock(return_value=False))
    with pytest.raises(PaymentError):
        clean_authorize(payment)


def test_clean_capture():
    # Amount should be a positive number
    payment = Mock()
    amount = Decimal("0.00")
    with pytest.raises(PaymentError):
        clean_capture(payment, amount)

    # Payment cannot be captured
    payment = Mock(can_capture=Mock(return_value=False))
    amount = Decimal("1.00")
    with pytest.raises(PaymentError):
        clean_capture(payment, amount)

    # Amount is larger than payment's total
    payment = Mock(
        can_capture=Mock(return_value=True),
        total=Decimal("1.00"),
        captured_amount=Decimal("0.00"),
    )
    amount = Decimal("2.00")
    with pytest.raises(PaymentError):
        clean_capture(payment, amount)

    amount = Decimal("2.00")
    payment = Mock(
        can_capture=Mock(return_value=True),
        total=amount,
        captured_amount=Decimal("0.00"),
    )
    clean_capture(payment, amount)


def test_can_authorize(payment_dummy: Payment):
    assert payment_dummy.charge_status == ChargeStatus.NOT_CHARGED

    payment_dummy.is_active = False
    assert not payment_dummy.can_authorize()

    payment_dummy.is_active = True
    assert payment_dummy.can_authorize()

    payment_dummy.charge_status = ChargeStatus.PARTIALLY_CHARGED
    assert not payment_dummy.can_authorize()

    payment_dummy.charge_status = ChargeStatus.FULLY_CHARGED
    assert not payment_dummy.can_authorize()


def test_can_capture(payment_txn_preauth: Payment):
    assert payment_txn_preauth.charge_status == ChargeStatus.NOT_CHARGED

    payment_txn_preauth.is_active = False
    assert not payment_txn_preauth.can_capture()

    payment_txn_preauth.is_active = True
    assert payment_txn_preauth.can_capture()

    payment_txn_preauth.charge_status = ChargeStatus.PARTIALLY_CHARGED
    assert not payment_txn_preauth.can_capture()

    payment_txn_preauth.charge_status = ChargeStatus.FULLY_CHARGED
    assert not payment_txn_preauth.can_capture()

    payment_txn_preauth.captured_amount = 0
    payment_txn_preauth.transactions.all().delete()
    assert not payment_txn_preauth.can_capture()


def test_can_void(payment_txn_preauth: Payment):
    assert payment_txn_preauth.charge_status == ChargeStatus.NOT_CHARGED

    payment_txn_preauth.is_active = False
    assert not payment_txn_preauth.can_void()

    payment_txn_preauth.is_active = True
    assert payment_txn_preauth.can_void()

    payment_txn_preauth.charge_status = ChargeStatus.PARTIALLY_CHARGED
    assert not payment_txn_preauth.can_void()

    payment_txn_preauth.charge_status = ChargeStatus.FULLY_CHARGED
    assert not payment_txn_preauth.can_void()

    payment_txn_preauth.charge_status = ChargeStatus.NOT_CHARGED
    payment_txn_preauth.transactions.all().delete()
    assert not payment_txn_preauth.can_void()


def test_can_refund(payment_dummy: Payment):
    assert payment_dummy.charge_status == ChargeStatus.NOT_CHARGED

    payment_dummy.is_active = False
    assert not payment_dummy.can_refund()

    payment_dummy.is_active = True
    assert not payment_dummy.can_refund()

    payment_dummy.charge_status = ChargeStatus.PARTIALLY_CHARGED
    assert payment_dummy.can_refund()

    payment_dummy.charge_status = ChargeStatus.FULLY_CHARGED
    assert payment_dummy.can_refund()


def test_payment_get_authorized_amount(payment_txn_preauth):
    payment = payment_txn_preauth

    authorized_amount = payment.transactions.first().amount
    assert payment.get_authorized_amount().amount == authorized_amount
    assert payment.order.total_authorized.amount == authorized_amount

    payment.transactions.create(
        amount=payment.total,
        kind=TransactionKind.CAPTURE,
        gateway_response={},
        is_success=True,
    )
    assert payment.get_authorized_amount().amount == Decimal(0)

    payment.transactions.all().delete()
    assert payment.get_authorized_amount().amount == Decimal(0)


def test_validate_gateway_response(gateway_response):
    validate_gateway_response(gateway_response)


def test_validate_gateway_response_incorrect_transaction_kind(gateway_response):
    gateway_response.kind = "incorrect-kind"

    with pytest.raises(GatewayError) as e:
        validate_gateway_response(gateway_response)

    assert str(e.value) == (
        "Gateway response kind must be one of {}".format(sorted(ALLOWED_GATEWAY_KINDS))
    )


def test_validate_gateway_response_not_json_serializable(gateway_response):
    class CustomClass(object):
        pass

    gateway_response.raw_response = CustomClass()

    with pytest.raises(GatewayError) as e:
        validate_gateway_response(gateway_response)

    assert str(e.value) == "Gateway response needs to be json serializable"