718 lines
25 KiB
Python
718 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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from django.contrib.contenttypes.fields import GenericForeignKey
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from django.contrib.contenttypes.models import ContentType
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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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import datetime
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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=datetime.timedelta(days=10)
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# Initialize logger.
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logger = logging.getLogger(__name__)
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def start_of_month(a_day):
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""" Returns first of the month of a given datetime object"""
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return a_day.replace(day=1,hour=0,minute=0,second=0, microsecond=0)
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def end_of_month(a_day):
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""" Returns first of the month of a given datetime object"""
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_, last_day = monthrange(a_day.year, a_day.month)
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return a_day.replace(day=last_day,hour=23,minute=59,second=59, microsecond=0)
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def start_of_this_month():
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""" Returns first of this month"""
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a_day = timezone.now()
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return a_day.replace(day=1,hour=0,minute=0,second=0, microsecond=0)
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def end_of_this_month():
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""" Returns first of this month"""
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a_day = timezone.now()
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_, last_day = monthrange(a_day.year, a_day.month)
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return a_day.replace(day=last_day,hour=23,minute=59,second=59, microsecond=0)
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def default_payment_delay():
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return timezone.now() + BILL_PAYMENT_DELAY
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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 they 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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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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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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owner = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
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organization = models.CharField(max_length=100, blank=True, null=True)
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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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active = models.BooleanField(default=False)
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class Meta:
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constraints = [
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models.UniqueConstraint(fields=['owner'],
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condition=Q(active=True),
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name='one_active_billing_address_per_user')
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]
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@staticmethod
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def get_address_for(user):
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return BillingAddress.objects.get(owner=user, active=True)
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def __str__(self):
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return "{} - {}, {}, {} {}, {}".format(
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self.owner,
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self.name, self.street, self.postal_code, self.city,
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self.country)
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###
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# VAT
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class VATRate(models.Model):
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starting_date = models.DateField(blank=True, null=True)
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ending_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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###
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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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owner = models.ForeignKey(get_user_model(),
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on_delete=models.CASCADE,
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editable=True)
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billing_address = models.ForeignKey(BillingAddress,
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on_delete=models.CASCADE)
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description = models.TextField()
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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, null=True)
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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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replaces = models.ForeignKey('self',
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related_name='replaced_by',
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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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@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.quantity for br in self.bill_records.all() ])
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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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@property
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def records(self):
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return OrderRecord.objects.filter(order=self)
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def __str__(self):
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return f"Order {self.owner}-{self.id}"
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class Bill(models.Model):
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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(default=start_of_this_month)
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ending_date = models.DateTimeField()
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due_date = models.DateField(default=default_payment_delay)
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# what is valid for? should this be "final"?
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valid = models.BooleanField(default=True)
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# Mapping to BillRecords
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# https://stackoverflow.com/questions/4443190/djangos-manytomany-relationship-with-additional-fields
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bill_records = models.ManyToManyField(Order, through="BillRecord")
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class Meta:
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constraints = [
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models.UniqueConstraint(fields=['owner',
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'starting_date',
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'ending_date' ],
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name='one_bill_per_month_per_user')
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]
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def __str__(self):
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return f"Bill {self.owner}-{self.id}"
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@classmethod
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def create_next_bill_for_user(cls, user):
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last_bill = cls.objects.filter(owner=user).order_by('id').last()
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all_orders = Order.objects.filter(owner=user).order_by('id')
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first_order = all_orders.first()
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# Calculate the start date
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if last_bill:
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starting_date = last_bill.end_date + datetime.timedelta(seconds=1)
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else:
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if first_order:
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starting_date = first_order.starting_date
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else:
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starting_date = timezone.now()
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ending_date = end_of_month(starting_date)
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for order in all_orders:
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# check if order needs to be billed
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# check if order has previous billing record
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pass
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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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quantity=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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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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order = models.ForeignKey(Order, on_delete=models.CASCADE)
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# How many times the order has been used in this record
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quantity = models.DecimalField(max_digits=19, decimal_places=10)
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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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def __str__(self):
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return f"{self.bill}: {self.quantity} x {self.order}"
|
|
|
|
|
|
class OrderRecord(models.Model):
|
|
"""
|
|
Order records store billing informations for products: the actual product
|
|
might be mutated and/or moved to another order but we do not want to loose
|
|
the details of old orders.
|
|
|
|
Used as source of trust to dynamically generate bill entries.
|
|
"""
|
|
|
|
order = models.ForeignKey(Order, on_delete=models.CASCADE)
|
|
|
|
one_time_price = models.DecimalField(default=0.0,
|
|
max_digits=AMOUNT_MAX_DIGITS,
|
|
decimal_places=AMOUNT_DECIMALS,
|
|
validators=[MinValueValidator(0)])
|
|
recurring_price = models.DecimalField(default=0.0,
|
|
max_digits=AMOUNT_MAX_DIGITS,
|
|
decimal_places=AMOUNT_DECIMALS,
|
|
validators=[MinValueValidator(0)])
|
|
|
|
description = models.TextField()
|
|
|
|
|
|
@property
|
|
def recurring_period(self):
|
|
return self.order.recurring_period
|
|
|
|
@property
|
|
def starting_date(self):
|
|
return self.order.starting_date
|
|
|
|
@property
|
|
def ending_date(self):
|
|
return self.order.ending_date
|
|
|
|
|
|
###
|
|
# Products
|
|
|
|
class Product(UncloudModel):
|
|
owner = models.ForeignKey(get_user_model(),
|
|
on_delete=models.CASCADE,
|
|
editable=False)
|
|
|
|
description = "Generic Product"
|
|
|
|
order = models.ForeignKey(Order,
|
|
on_delete=models.CASCADE,
|
|
editable=True,
|
|
null=True)
|
|
# FIXME: editable=True -> is in the admin, but also editable in DRF
|
|
|
|
status = models.CharField(max_length=32,
|
|
choices=UncloudStatus.choices,
|
|
default=UncloudStatus.AWAITING_PAYMENT)
|
|
|
|
# Default period for all products
|
|
default_recurring_period = RecurringPeriod.PER_30D
|
|
|
|
|
|
def create_or_update_order(self, when_to_start=None):
|
|
if not when_to_start:
|
|
when_to_start = timezone.now()
|
|
|
|
if not self.order:
|
|
billing_address = BillingAddress.get_address_for(self.owner)
|
|
|
|
if not billing_address:
|
|
raise ValidationError("Cannot order without a billing address")
|
|
|
|
self.order = Order.objects.create(owner=self.owner,
|
|
billing_address=billing_address,
|
|
starting_date=when_to_start,
|
|
one_time_price=self.one_time_price,
|
|
recurring_period=self.default_recurring_period,
|
|
recurring_price=self.recurring_price,
|
|
description=str(self))
|
|
|
|
else:
|
|
previous_order = self.order
|
|
when_to_end = when_to_start - datetime.timedelta(seconds=1)
|
|
|
|
new_order = Order.objects.create(owner=self.owner,
|
|
billing_address=self.order.billing_address,
|
|
starting_date=when_to_start,
|
|
one_time_price=self.one_time_price,
|
|
recurring_period=self.default_recurring_period,
|
|
recurring_price=self.recurring_price,
|
|
description=str(self),
|
|
replaces=self.order)
|
|
|
|
self.order.end_date = when_to_end
|
|
self.order.save()
|
|
|
|
self.order = new_order
|
|
|
|
|
|
def save(self, *args, **kwargs):
|
|
# Create order the first time a product is created
|
|
if self._state.adding:
|
|
self.create_or_update_order()
|
|
|
|
super().save(*args, **kwargs)
|
|
|
|
@property
|
|
def recurring_price(self):
|
|
pass # To be implemented in child.
|
|
|
|
@property
|
|
def one_time_price(self):
|
|
"""
|
|
Default is 0 CHF
|
|
"""
|
|
return 0
|
|
|
|
@property
|
|
def billing_address(self):
|
|
return self.order.billing_address
|
|
|
|
@staticmethod
|
|
def allowed_recurring_periods():
|
|
return RecurringPeriod.choices
|
|
|
|
class Meta:
|
|
abstract = True
|
|
|
|
def discounted_price_by_period(self, requested_period):
|
|
"""
|
|
Each product has a standard recurring period for which
|
|
we define a pricing. I.e. VPN is usually year, VM is usually monthly.
|
|
|
|
The user can opt-in to use a different period, which influences the price:
|
|
The longer a user commits, the higher the discount.
|
|
|
|
Products can also be limited in the available periods. For instance
|
|
a VPN only makes sense to be bought for at least one day.
|
|
|
|
Rules are as follows:
|
|
|
|
given a standard recurring period of ..., changing to ... modifies price ...
|
|
|
|
|
|
# One month for free if buying / year, compared to a month: about 8.33% discount
|
|
per_year -> per_month -> /11
|
|
per_month -> per_year -> *11
|
|
|
|
# Month has 30.42 days on average. About 7.9% discount to go monthly
|
|
per_month -> per_day -> /28
|
|
per_day -> per_month -> *28
|
|
|
|
# Day has 24h, give one for free
|
|
per_day -> per_hour -> /23
|
|
per_hour -> per_day -> /23
|
|
|
|
|
|
Examples
|
|
|
|
VPN @ 120CHF/y becomes
|
|
- 10.91 CHF/month (130.91 CHF/year)
|
|
- 0.39 CHF/day (142.21 CHF/year)
|
|
|
|
VM @ 15 CHF/month becomes
|
|
- 165 CHF/month (13.75 CHF/month)
|
|
- 0.54 CHF/day (16.30 CHF/month)
|
|
|
|
"""
|
|
|
|
|
|
if self.default_recurring_period == RecurringPeriod.PER_365D:
|
|
if requested_period == RecurringPeriod.PER_365D:
|
|
return self.recurring_price
|
|
if requested_period == RecurringPeriod.PER_30D:
|
|
return self.recurring_price/11.
|
|
if requested_period == RecurringPeriod.PER_DAY:
|
|
return self.recurring_price/11./28.
|
|
|
|
elif self.default_recurring_period == RecurringPeriod.PER_30D:
|
|
if requested_period == RecurringPeriod.PER_365D:
|
|
return self.recurring_price*11
|
|
if requested_period == RecurringPeriod.PER_30D:
|
|
return self.recurring_price
|
|
if requested_period == RecurringPeriod.PER_DAY:
|
|
return self.recurring_price/28.
|
|
|
|
elif self.default_recurring_period == RecurringPeriod.PER_DAY:
|
|
if requested_period == RecurringPeriod.PER_365D:
|
|
return self.recurring_price*11*28
|
|
if requested_period == RecurringPeriod.PER_30D:
|
|
return self.recurring_price*28
|
|
if requested_period == RecurringPeriod.PER_DAY:
|
|
return self.recurring_price
|
|
else:
|
|
# FIXME: use the right type of exception here!
|
|
raise Exception("Did not implement the discounter for this case")
|