dashboard/billing/tests.py

# Copyright © 2022 Aravinth Manivannan <realaravinth@batsense.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
import time
from io import StringIO

from django.contrib.auth import get_user_model
from django.core import mail
from django.core.management import call_command
from django.urls import reverse
from django.test import TestCase, Client, override_settings
from django.utils.http import urlencode
from django.contrib.auth import authenticate
from django.core.management import call_command
from django.conf import settings

from payments import get_payment_model, RedirectNeeded, PaymentStatus

from accounts.tests import register_util, login_util
from dash.tests import create_configurations, create_instance_util, infra_custom_config
from dash.models import Instance

from .models import Payment
from .utils import payment_fullfilled


class BillingTest(TestCase):
    """
    Tests billing system
    """

    def setUp(self):
        self.username = "billing_user"
        register_util(t=self, username=self.username)
        create_configurations(t=self)

    @override_settings(HOSTEA=infra_custom_config(test_name="test_payments"))
    def test_payments(self):
        c = Client()
        login_util(self, c, "accounts.home")
        instance_name = "tpayments"
        create_instance_util(
            t=self, c=c, instance_name=instance_name, config=self.instance_config[0]
        )

        instance = Instance.objects.get(name=instance_name)

        self.assertEqual(payment_fullfilled(instance=instance), True)

        payment = get_payment_model().objects.get(paid_by=self.user)
        invoice_uri = reverse("billing.invoice.details", args=(payment.public_ref,))

        # check if paid invoice is listed in paid invoice list view
        resp = c.get(reverse("billing.invoice.paid"))
        self.assertEqual(str.encode(invoice_uri) in resp.content, True)

        # check if the paid invoice is displayed in the pending invoice view, should not be displayed
        resp = c.get(reverse("billing.invoice.pending"))
        self.assertEqual(str.encode(invoice_uri) in resp.content, False)

        # check if the invoice details view is rendering paid invoice version
        resp = c.get(invoice_uri)
        self.assertEqual(str.encode(instance_name) in resp.content, True)
        self.assertEqual(
            str.encode(str(self.instance_config[0].rent)) in resp.content, True
        )
        self.assertEqual(str.encode("Paid on") in resp.content, True)

        # try to generate an invoice for the second time on the same VM
        # shouldn't be possible since payment is already made for the duration
        payment_uri = reverse("billing.invoice.generate", args=(instance.name,))
        resp = c.get(payment_uri)
        self.assertEqual(resp.status_code, 400)

        ## payment success page; no real functionality but user is redirected here
        # by stripe if payment is successful
        resp = c.get(reverse("billing.invoice.success", args=(payment.public_ref,)))
        self.assertEqual(
            resp.headers["Location"],
            reverse("infra.create", args=(payment.instance_name,)),
        )

        # create_instance_util creates an instance and pays for it. An email is
        # sent when the invoice is generated and one after payment is made
        #
        # So we are first checking for the last email that was sent(receipt)
        # and then the Gitea instance credentials notification followed by the
        # invoice generation email.
        receipt_mail = mail.outbox.pop()
        print(receipt_mail.body)
        self.assertEqual(
            all(
                [
                    receipt_mail.to[0] == self.email,
                    "This is a receipt for your latest Gna! payment"
                    in receipt_mail.body,
                ]
            ),
            True,
        )

        instance_notificaiton = mail.outbox.pop()
        self.assertEqual(
            all(
                [
                    instance_notificaiton.to[0] == self.email,
                    "Congratulations on your new Gna! instance!"
                    in instance_notificaiton.body,
                ]
            ),
            True,
        )

        ## payment failure page; no real functionality but user is redirected here
        # by stripe if payment is successful
        resp = c.get(reverse("billing.invoice.fail", args=(payment.public_ref,)))
        self.assertEqual(b"failed" in resp.content, True)


class GenerateInvoiceCommand(TestCase):
    """
    Test command: manage.py generate_invoice
    """

    def setUp(self):
        self.username = "test_generate_invoice_cmd_user"
        register_util(t=self, username=self.username)
        create_configurations(t=self)

    @override_settings(
        HOSTEA=infra_custom_config(
            test_name="test_dont_send_invoices_to_not_created_vms"
        )
    )
    def test_dont_send_invoices_to_not_created_vms(self):

        c = Client()
        login_util(self, c, "accounts.home")

        instance_name = "tnoinvonocrevm"

        payload = {"name": instance_name, "configuration": self.instance_config[0].name}

        resp = c.post(reverse("dash.instances.new"), payload)
        self.assertEqual(resp.status_code, 302)
        self.assertEqual(
            resp.headers["location"],
            reverse("billing.invoice.generate", args=(instance_name,)),
        )

        stdout = StringIO()
        stderr = StringIO()

        instance = Instance.objects.get(name=instance_name)
        self.assertEqual(payment_fullfilled(instance=instance), False)
        prev_len = len(mail.outbox)

        # username exists
        call_command(
            "generate_invoice",
            stdout=stdout,
            stderr=stderr,
        )
        out = stdout.getvalue()
        print(out)
        self.assertEqual(instance_name not in out, True)

    @override_settings(
        HOSTEA=infra_custom_config(test_name="test_generate_invoice_cmd")
    )
    def test_cmd(self):
        c = Client()
        login_util(self, c, "accounts.home")
        instance_name = "tgeninvmd"
        create_instance_util(
            t=self, c=c, instance_name=instance_name, config=self.instance_config[0]
        )

        stdout = StringIO()
        stderr = StringIO()

        instance = Instance.objects.get(name=instance_name)
        self.assertEqual(payment_fullfilled(instance=instance), True)
        prev_len = len(mail.outbox)

        # username exists
        call_command(
            "generate_invoice",
            stdout=stdout,
            stderr=stderr,
        )
        out = stdout.getvalue()
        print(out)
        self.assertEqual(instance_name in out, True)

        self.assertEqual(prev_len, len(mail.outbox))

        # delete payment and re-generate with command
        get_payment_model().objects.get(instance_name=instance_name).delete()

        stdout = StringIO()
        stderr = StringIO()

        call_command(
            "generate_invoice",
            stdout=stdout,
            stderr=stderr,
        )
        out = stdout.getvalue()
        print("out")
        print(out)
        self.assertEqual(instance_name in out, True)
        self.assertEqual(f"Payment not fulfilled for instance: {instance}" in out, True)
        self.assertEqual(prev_len + 1, len(mail.outbox))