forked from uncloud/uncloud
705 lines
25 KiB
Python
705 lines
25 KiB
Python
from django.db import models
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from django.db.models import Q
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from django.contrib.auth import get_user_model
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from django.utils.translation import gettext_lazy as _
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from django.core.validators import MinValueValidator
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from django.utils import timezone
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from django.core.exceptions import ObjectDoesNotExist, ValidationError
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import uuid
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import logging
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from functools import reduce
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import itertools
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from math import ceil
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from datetime import timedelta
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from calendar import monthrange
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from decimal import Decimal
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import uncloud_pay.stripe
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from uncloud_pay.helpers import beginning_of_month, end_of_month
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from uncloud_pay import AMOUNT_DECIMALS, AMOUNT_MAX_DIGITS, COUNTRIES
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from uncloud.models import UncloudModel, UncloudStatus
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from decimal import Decimal
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import decimal
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# Used to generate bill due dates.
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BILL_PAYMENT_DELAY=timedelta(days=10)
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# Initialize logger.
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logger = logging.getLogger(__name__)
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# See https://docs.djangoproject.com/en/dev/ref/models/fields/#field-choices-enum-types
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class RecurringPeriod(models.IntegerChoices):
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"""
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We don't support months are years, because the vary in length.
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This is not only complicated, but also unfair to the user, as the user pays the same
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amount for different durations.
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"""
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PER_365D = 365*24*3600, _('Per 365 days')
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PER_30D = 30*24*3600, _('Per 30 days')
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PER_WEEK = 7*24*3600, _('Per Week')
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PER_DAY = 24*3600, _('Per Day')
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PER_HOUR = 3600, _('Per Hour')
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PER_MINUTE = 60, _('Per Minute')
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PER_SECOND = 1, _('Per Second')
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ONE_TIME = 0, _('Onetime')
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class CountryField(models.CharField):
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def __init__(self, *args, **kwargs):
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kwargs.setdefault('choices', COUNTRIES)
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kwargs.setdefault('default', 'CH')
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kwargs.setdefault('max_length', 2)
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super().__init__(*args, **kwargs)
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def get_internal_type(self):
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return "CharField"
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def get_balance_for_user(user):
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bills = reduce(
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lambda acc, entry: acc + entry.total,
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Bill.objects.filter(owner=user),
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0)
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payments = reduce(
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lambda acc, entry: acc + entry.amount,
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Payment.objects.filter(owner=user),
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0)
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return payments - bills
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class StripeCustomer(models.Model):
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owner = models.OneToOneField( get_user_model(),
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primary_key=True,
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on_delete=models.CASCADE)
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stripe_id = models.CharField(max_length=32)
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###
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# Payments and Payment Methods.
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class Payment(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE)
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amount = models.DecimalField(
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default=0.0,
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max_digits=AMOUNT_MAX_DIGITS,
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decimal_places=AMOUNT_DECIMALS,
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validators=[MinValueValidator(0)])
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source = models.CharField(max_length=256,
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choices = (
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('wire', 'Wire Transfer'),
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('stripe', 'Stripe'),
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('voucher', 'Voucher'),
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('referral', 'Referral'),
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('unknown', 'Unknown')
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),
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default='unknown')
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timestamp = models.DateTimeField(editable=False, auto_now_add=True)
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# We override save() in order to active products awaiting payment.
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def save(self, *args, **kwargs):
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# _state.adding is switched to false after super(...) call.
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being_created = self._state.adding
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unpaid_bills_before_payment = Bill.get_unpaid_for(self.owner)
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super(Payment, self).save(*args, **kwargs) # Save payment in DB.
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unpaid_bills_after_payment = Bill.get_unpaid_for(self.owner)
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newly_paid_bills = list(
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set(unpaid_bills_before_payment) - set(unpaid_bills_after_payment))
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for bill in newly_paid_bills:
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bill.activate_products()
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class PaymentMethod(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE,
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editable=False)
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source = models.CharField(max_length=256,
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choices = (
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('stripe', 'Stripe'),
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('unknown', 'Unknown'),
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),
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default='stripe')
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description = models.TextField()
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primary = models.BooleanField(default=False, editable=False)
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# Only used for "Stripe" source
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stripe_payment_method_id = models.CharField(max_length=32, blank=True, null=True)
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stripe_setup_intent_id = models.CharField(max_length=32, blank=True, null=True)
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@property
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def stripe_card_last4(self):
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if self.source == 'stripe' and self.active:
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payment_method = uncloud_pay.stripe.get_payment_method(
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self.stripe_payment_method_id)
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return payment_method.card.last4
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else:
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return None
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@property
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def active(self):
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if self.source == 'stripe' and self.stripe_payment_method_id != None:
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return True
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else:
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return False
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def charge(self, amount):
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if not self.active:
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raise Exception('This payment method is inactive.')
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if amount < 0: # Make sure we don't charge negative amount by errors...
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raise Exception('Cannot charge negative amount.')
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if self.source == 'stripe':
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stripe_customer = StripeCustomer.objects.get(owner=self.owner).stripe_id
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stripe_payment = uncloud_pay.stripe.charge_customer(
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amount, stripe_customer, self.stripe_payment_method_id)
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if 'paid' in stripe_payment and stripe_payment['paid'] == False:
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raise Exception(stripe_payment['error'])
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else:
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payment = Payment.objects.create(
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owner=self.owner, source=self.source, amount=amount)
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return payment
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else:
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raise Exception('This payment method is unsupported/cannot be charged.')
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def set_as_primary_for(self, user):
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methods = PaymentMethod.objects.filter(owner=user, primary=True)
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for method in methods:
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print(method)
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method.primary = False
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method.save()
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self.primary = True
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self.save()
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def get_primary_for(user):
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methods = PaymentMethod.objects.filter(owner=user)
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for method in methods:
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# Do we want to do something with non-primary method?
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if method.active and method.primary:
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return method
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return None
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class Meta:
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# TODO: limit to one primary method per user.
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# unique_together is no good since it won't allow more than one
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# non-primary method.
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pass
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###
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# Bills.
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class BillingAddress(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
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organization = models.CharField(max_length=100)
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name = models.CharField(max_length=100)
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street = models.CharField(max_length=100)
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city = models.CharField(max_length=50)
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postal_code = models.CharField(max_length=50)
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country = CountryField(blank=True)
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vat_number = models.CharField(max_length=100, default="", blank=True)
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@staticmethod
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def get_addresses_for(user):
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return BillingAddress.objects.filter(owner=user)
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@classmethod
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def get_preferred_address_for(cls, user):
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addresses = cls.get_addresses_for(user)
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if len(addresses) == 0:
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return None
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else:
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# TODO: allow user to set primary/preferred address
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return addresses[0]
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def __str__(self):
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return "{}, {}, {} {}, {}".format(
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self.name, self.street, self.postal_code, self.city,
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self.country)
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# Populated with the import-vat-numbers django command.
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class VATRate(models.Model):
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start_date = models.DateField(blank=True, null=True)
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stop_date = models.DateField(blank=True, null=True)
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territory_codes = models.TextField(blank=True, default='')
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currency_code = models.CharField(max_length=10)
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rate = models.FloatField()
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rate_type = models.TextField(blank=True, default='')
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description = models.TextField(blank=True, default='')
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@staticmethod
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def get_for_country(country_code):
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vat_rate = None
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try:
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vat_rate = VATRate.objects.get(
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territory_codes=country_code, start_date__isnull=False, stop_date=None
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)
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return vat_rate.rate
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except VATRate.DoesNotExist as dne:
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logger.debug(str(dne))
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logger.debug("Did not find VAT rate for %s, returning 0" % country_code)
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return 0
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class BillRecord(models.Model):
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"""
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Entry of a bill, dynamically generated from an order.
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"""
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bill = models.ForeignKey(Bill, on_delete=models.CASCADE)
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# How many times the order has been used in this record
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usage_count = models.IntegerField(default=1)
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# The timeframe the bill record is for can (and probably often will) differ
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# from the bill time
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creation_date = models.DateTimeField(auto_now_add=True)
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starting_date = models.DateTimeField()
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ending_date = models.DateTimeField()
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class Bill(models.Model):
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""" FIXME:
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Bill needs to be unique in the triple (owner, year, month)
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"""
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE)
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creation_date = models.DateTimeField(auto_now_add=True)
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starting_date = models.DateTimeField()
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ending_date = models.DateTimeField()
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due_date = models.DateField()
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valid = models.BooleanField(default=True)
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# billing address and vat rate is the same for the whole bill
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# @property
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# def vat_rate(self):
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# return Decimal(VATRate.get_for_country(self.bill.billing_address.country))
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@classmethod
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def create_all_bills(cls):
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for owner in get_user_model().objects.all():
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# mintime = time of first order
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# maxtime = time of last order
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# iterate month based through it
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cls.assign_orders_to_bill(owner, year, month)
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pass
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def assign_orders_to_bill(self, owner, year, month):
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"""
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Generate a bill for the specific month of a user.
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First handle all one time orders
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FIXME:
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- limit this to active users in the future! (2020-05-23)
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"""
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"""
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Find all one time orders that have a starting date that falls into this month
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recurring_period=RecurringPeriod.ONE_TIME,
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Can we do this even for recurring / all of them
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"""
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# FIXME: add something to check whether the order should be billed at all - i.e. a marker that
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# disables searching -> optimization for later
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# Create the initial bill record
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# FIXME: maybe limit not even to starting/ending date, but to empty_bill record -- to be fixed in the future
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# for order in Order.objects.filter(Q(starting_date__gte=self.starting_date),
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# Q(starting_date__lte=self.ending_date),
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# FIXME below: only check for active orders
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# Ensure all orders of that owner have at least one bill record
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for order in Order.objects.filter(owner=owner,
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bill_records=None):
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bill_record = BillRecord.objects.create(bill=self,
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usage_count=1,
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starting_date=order.starting_date,
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ending_date=order.starting_date + timedelta(seconds=order.recurring_period))
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# For each recurring order get the usage and bill it
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for order in Order.objects.filter(~Q(recurring_period=RecurringPeriod.ONE_TIME),
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Q(starting_date__lt=self.starting_date),
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owner=owner):
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if order.recurring_period > 0: # avoid div/0 - these are one time payments
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# How much time will have passed by the end of the billing cycle
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td = self.ending_date - order.starting_date
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# How MANY times it will have been used by then
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used_times = ceil(td / timedelta(seconds=order.recurring_period))
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billed_times = len(order.bills)
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# How many times it WAS billed -- can also be inferred from the bills that link to it!
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if used_times > billed_times:
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billing_times = used_times - billed_times
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# ALSO REGISTER THE TIME PERIOD!
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pass
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###
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# Orders.
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class Order(models.Model):
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"""
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Order are assumed IMMUTABLE and used as SOURCE OF TRUST for generating
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bills. Do **NOT** mutate then!
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"""
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE,
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editable=False)
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billing_address = models.ForeignKey(BillingAddress, on_delete=models.CASCADE)
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description = models.TextField()
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replaced_by = models.ForeignKey('self', on_delete=models.CASCADE, blank=True, null=True)
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# TODO: enforce ending_date - starting_date to be larger than recurring_period.
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creation_date = models.DateTimeField(auto_now_add=True)
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starting_date = models.DateTimeField(default=timezone.now)
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ending_date = models.DateTimeField(blank=True,
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null=True)
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bill_records = models.ManyToManyField(BillRecord,
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editable=False,
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blank=True)
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@property
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def count_billed(self):
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"""
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How many times this order was billed so far.
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This logic is mainly thought to be for recurring bills, but also works for one time bills
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"""
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return sum([ br.usage_count for br in self.bill_records.all() ])
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recurring_period = models.IntegerField(choices = RecurringPeriod.choices,
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default = RecurringPeriod.PER_30D)
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one_time_price = models.DecimalField(default=0.0,
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max_digits=AMOUNT_MAX_DIGITS,
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decimal_places=AMOUNT_DECIMALS,
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validators=[MinValueValidator(0)])
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recurring_price = models.DecimalField(default=0.0,
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max_digits=AMOUNT_MAX_DIGITS,
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decimal_places=AMOUNT_DECIMALS,
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validators=[MinValueValidator(0)])
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replaced_by = models.ForeignKey('self',
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related_name='supersede',
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on_delete=models.PROTECT,
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blank=True,
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null=True)
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depends_on = models.ForeignKey('self',
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related_name='parent_of',
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on_delete=models.PROTECT,
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blank=True,
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null=True)
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def active_before(self, ending_date):
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# Was this order started before the specified ending date?
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if self.starting_date <= ending_date:
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if self.ending_date:
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if self.ending_date > ending_date:
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pass
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@property
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def is_recurring(self):
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return not self.recurring_period == RecurringPeriod.ONE_TIME
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@property
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def is_terminated(self):
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return self.ending_date != None and self.ending_date < timezone.now()
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def is_terminated_at(self, a_date):
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return self.ending_date != None and self.ending_date < timezone.now()
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def terminate(self):
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if not self.is_terminated:
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self.ending_date = timezone.now()
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self.save()
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# Trigger initial bill generation at order creation.
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def save(self, *args, **kwargs):
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if self.ending_date and self.ending_date < self.starting_date:
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raise ValidationError("End date cannot be before starting date")
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super().save(*args, **kwargs)
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def generate_initial_bill(self):
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return Bill.generate_for(self.starting_date.year, self.starting_date.month, self.owner)
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# Used by uncloud_pay tests.
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@property
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def bills(self):
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return Bill.objects.filter(order=self)
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@staticmethod
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def from_product(product, **kwargs):
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# FIXME: this is only a workaround.
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billing_address = BillingAddress.get_preferred_address_for(product.owner)
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if billing_address == None:
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raise Exception("Owner does not have a billing address!")
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return Order(description=product.description,
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one_time_price=product.one_time_price,
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recurring_price=product.recurring_price,
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billing_address=billing_address,
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owner=product.owner,
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**kwargs)
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def __str__(self):
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return "Order {} created at {}, {}->{}, recurring period {}. One time price {}, recurring price {}".format(
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self.uuid, self.creation_date,
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self.starting_date, self.ending_date,
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self.recurring_period,
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self.one_time_price,
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self.recurring_price)
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@property
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def records(self):
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return OrderRecord.objects.filter(order=self)
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@property
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def one_time_price(self):
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return reduce(lambda acc, record: acc + record.one_time_price, self.records, 0)
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@property
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def recurring_price(self):
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return reduce(lambda acc, record: acc + record.recurring_price, self.records, 0)
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# Used by uncloud_pay tests.
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@property
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def bills(self):
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return Bill.objects.filter(order=self)
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def add_record(self, one_time_price, recurring_price, description):
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OrderRecord.objects.create(order=self,
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one_time_price=one_time_price,
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recurring_price=recurring_price,
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description=description)
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def __str__(self):
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return "Order {} created at {}, {}->{}, recurring period {}. Price one time {}, recurring {}".format(
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self.uuid, self.creation_date,
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self.starting_date, self.ending_date,
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self.recurring_period,
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self.one_time_price,
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self.recurring_price)
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class OrderRecord(models.Model):
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"""
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Order records store billing informations for products: the actual product
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might be mutated and/or moved to another order but we do not want to loose
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the details of old orders.
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Used as source of trust to dynamically generate bill entries.
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"""
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order = models.ForeignKey(Order, on_delete=models.CASCADE)
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one_time_price = models.DecimalField(default=0.0,
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max_digits=AMOUNT_MAX_DIGITS,
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decimal_places=AMOUNT_DECIMALS,
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validators=[MinValueValidator(0)])
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recurring_price = models.DecimalField(default=0.0,
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max_digits=AMOUNT_MAX_DIGITS,
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decimal_places=AMOUNT_DECIMALS,
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validators=[MinValueValidator(0)])
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description = models.TextField()
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@property
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def recurring_period(self):
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return self.order.recurring_period
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@property
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def starting_date(self):
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return self.order.starting_date
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@property
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def ending_date(self):
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return self.order.ending_date
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###
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# Products
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# Abstract (= no database representation) class used as parent for products
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# (e.g. uncloud_vm.models.VMProduct).
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class Product(UncloudModel):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE,
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editable=False)
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description = "Generic Product"
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status = models.CharField(max_length=32,
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choices=UncloudStatus.choices,
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default=UncloudStatus.AWAITING_PAYMENT)
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order = models.ForeignKey(Order,
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on_delete=models.CASCADE,
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editable=False,
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null=True)
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# Default period for all products
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default_recurring_period = RecurringPeriod.PER_30D
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# Used to save records.
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def save(self, *args, **kwargs):
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# _state.adding is switched to false after super(...) call.
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being_created = self._state.adding
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# First time saving - create an order
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if not self.order:
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billing_address = BillingAddress.get_preferred_address_for(self.owner)
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print(billing_address)
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if not billing_address:
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raise ValidationError("Cannot order without a billing address")
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# FIXME: allow user to choose recurring_period
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self.order = Order.objects.create(owner=self.owner,
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billing_address=billing_address,
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one_time_price=self.one_time_price,
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recurring_period=self.default_recurring_period,
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recurring_price=self.recurring_price)
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super().save(*args, **kwargs)
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# # Make sure we only create records on creation.
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# if being_created:
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# record = OrderRecord(
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# one_time_price=self.one_time_price,
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# recurring_price=self.recurring_price,
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# description=self.description)
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# self.order.orderrecord_set.add(record, bulk=False)
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@property
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def recurring_price(self):
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pass # To be implemented in child.
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@property
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def one_time_price(self):
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return 0
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@property
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def billing_address(self):
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return self.order.billing_address
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@staticmethod
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def allowed_recurring_periods():
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return RecurringPeriod.choices
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class Meta:
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abstract = True
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def discounted_price_by_period(self, requested_period):
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"""
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Each product has a standard recurring period for which
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we define a pricing. I.e. VPN is usually year, VM is usually monthly.
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The user can opt-in to use a different period, which influences the price:
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The longer a user commits, the higher the discount.
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Products can also be limited in the available periods. For instance
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a VPN only makes sense to be bought for at least one day.
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Rules are as follows:
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given a standard recurring period of ..., changing to ... modifies price ...
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# One month for free if buying / year, compared to a month: about 8.33% discount
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per_year -> per_month -> /11
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per_month -> per_year -> *11
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# Month has 30.42 days on average. About 7.9% discount to go monthly
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per_month -> per_day -> /28
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per_day -> per_month -> *28
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# Day has 24h, give one for free
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per_day -> per_hour -> /23
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per_hour -> per_day -> /23
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Examples
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VPN @ 120CHF/y becomes
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- 10.91 CHF/month (130.91 CHF/year)
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- 0.39 CHF/day (142.21 CHF/year)
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VM @ 15 CHF/month becomes
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- 165 CHF/month (13.75 CHF/month)
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- 0.54 CHF/day (16.30 CHF/month)
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"""
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if self.default_recurring_period == RecurringPeriod.PER_365D:
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if requested_period == RecurringPeriod.PER_365D:
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return self.recurring_price
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if requested_period == RecurringPeriod.PER_30D:
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return self.recurring_price/11.
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if requested_period == RecurringPeriod.PER_DAY:
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return self.recurring_price/11./28.
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elif self.default_recurring_period == RecurringPeriod.PER_30D:
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if requested_period == RecurringPeriod.PER_365D:
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return self.recurring_price*11
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if requested_period == RecurringPeriod.PER_30D:
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return self.recurring_price
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if requested_period == RecurringPeriod.PER_DAY:
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return self.recurring_price/28.
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elif self.default_recurring_period == RecurringPeriod.PER_DAY:
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if requested_period == RecurringPeriod.PER_365D:
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return self.recurring_price*11*28
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if requested_period == RecurringPeriod.PER_30D:
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return self.recurring_price*28
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if requested_period == RecurringPeriod.PER_DAY:
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return self.recurring_price
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else:
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# FIXME: use the right type of exception here!
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raise Exception("Did not implement the discounter for this case")
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# Interesting snippets
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# # Trigger initial bill generation at order creation.
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# def save(self, *args, **kwargs):
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# if self.ending_date and self.ending_date < self.starting_date:
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# raise ValidationError("End date cannot be before starting date")
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# super().save(*args, **kwargs)
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# Bill.generate_for(self.starting_date.year, self.starting_date.month, self.owner)
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