uncloud/uncloud_pay/models.py

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from django.db import models
from django.db.models import Q
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from django.contrib.auth import get_user_model
from django.utils.translation import gettext_lazy as _
from django.core.validators import MinValueValidator
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from django.utils import timezone
from django.core.exceptions import ObjectDoesNotExist, ValidationError
from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType
import logging
from functools import reduce
import itertools
from math import ceil
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import datetime
from calendar import monthrange
from decimal import Decimal
import uncloud_pay.stripe
from uncloud_pay.helpers import beginning_of_month, end_of_month
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
import decimal
# Used to generate bill due dates.
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BILL_PAYMENT_DELAY=datetime.timedelta(days=10)
# Initialize logger.
logger = logging.getLogger(__name__)
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def start_of_month(a_day):
""" Returns first of the month of a given datetime object"""
return a_day.replace(day=1,hour=0,minute=0,second=0, microsecond=0)
def end_of_month(a_day):
""" Returns first of the month of a given datetime object"""
_, last_day = monthrange(a_day.year, a_day.month)
return a_day.replace(day=last_day,hour=23,minute=59,second=59, microsecond=0)
def start_of_this_month():
""" Returns first of this month"""
a_day = timezone.now()
return a_day.replace(day=1,hour=0,minute=0,second=0, microsecond=0)
def end_of_this_month():
""" Returns first of this month"""
a_day = timezone.now()
_, last_day = monthrange(a_day.year, a_day.month)
return a_day.replace(day=last_day,hour=23,minute=59,second=59, microsecond=0)
def end_before(a_date):
""" Return suitable datetimefield for ending just before a_date """
return a_date - datetime.timedelta(seconds=1)
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def default_payment_delay():
return timezone.now() + BILL_PAYMENT_DELAY
# See https://docs.djangoproject.com/en/dev/ref/models/fields/#field-choices-enum-types
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
amount for different durations.
"""
PER_365D = 365*24*3600, _('Per 365 days')
PER_30D = 30*24*3600, _('Per 30 days')
PER_WEEK = 7*24*3600, _('Per Week')
PER_DAY = 24*3600, _('Per Day')
PER_HOUR = 3600, _('Per Hour')
PER_MINUTE = 60, _('Per Minute')
PER_SECOND = 1, _('Per Second')
ONE_TIME = 0, _('Onetime')
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class CountryField(models.CharField):
def __init__(self, *args, **kwargs):
kwargs.setdefault('choices', COUNTRIES)
kwargs.setdefault('default', 'CH')
kwargs.setdefault('max_length', 2)
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super().__init__(*args, **kwargs)
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def get_internal_type(self):
return "CharField"
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def get_balance_for_user(user):
bills = reduce(
lambda acc, entry: acc + entry.total,
Bill.objects.filter(owner=user),
0)
payments = reduce(
lambda acc, entry: acc + entry.amount,
Payment.objects.filter(owner=user),
0)
return payments - bills
class StripeCustomer(models.Model):
owner = models.OneToOneField( get_user_model(),
primary_key=True,
on_delete=models.CASCADE)
stripe_id = models.CharField(max_length=32)
###
# Payments and Payment Methods.
class Payment(models.Model):
owner = models.ForeignKey(get_user_model(),
on_delete=models.CASCADE)
amount = models.DecimalField(
default=0.0,
max_digits=AMOUNT_MAX_DIGITS,
decimal_places=AMOUNT_DECIMALS,
validators=[MinValueValidator(0)])
source = models.CharField(max_length=256,
choices = (
('wire', 'Wire Transfer'),
('stripe', 'Stripe'),
('voucher', 'Voucher'),
('referral', 'Referral'),
('unknown', 'Unknown')
),
default='unknown')
timestamp = models.DateTimeField(editable=False, auto_now_add=True)
# We override save() in order to active products awaiting payment.
def save(self, *args, **kwargs):
# _state.adding is switched to false after super(...) call.
being_created = self._state.adding
unpaid_bills_before_payment = Bill.get_unpaid_for(self.owner)
super(Payment, self).save(*args, **kwargs) # Save payment in DB.
unpaid_bills_after_payment = Bill.get_unpaid_for(self.owner)
newly_paid_bills = list(
set(unpaid_bills_before_payment) - set(unpaid_bills_after_payment))
for bill in newly_paid_bills:
bill.activate_products()
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class PaymentMethod(models.Model):
owner = models.ForeignKey(get_user_model(),
on_delete=models.CASCADE,
editable=False)
source = models.CharField(max_length=256,
choices = (
('stripe', 'Stripe'),
('unknown', 'Unknown'),
),
default='stripe')
description = models.TextField()
primary = models.BooleanField(default=False, editable=False)
# Only used for "Stripe" source
stripe_payment_method_id = models.CharField(max_length=32, blank=True, null=True)
stripe_setup_intent_id = models.CharField(max_length=32, blank=True, null=True)
@property
def stripe_card_last4(self):
if self.source == 'stripe' and self.active:
payment_method = uncloud_pay.stripe.get_payment_method(
self.stripe_payment_method_id)
return payment_method.card.last4
else:
return None
@property
def active(self):
if self.source == 'stripe' and self.stripe_payment_method_id != None:
return True
else:
return False
def charge(self, amount):
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if not self.active:
raise Exception('This payment method is inactive.')
if amount < 0: # Make sure we don't charge negative amount by errors...
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raise Exception('Cannot charge negative amount.')
if self.source == 'stripe':
stripe_customer = StripeCustomer.objects.get(owner=self.owner).stripe_id
stripe_payment = uncloud_pay.stripe.charge_customer(
amount, stripe_customer, self.stripe_payment_method_id)
if 'paid' in stripe_payment and stripe_payment['paid'] == False:
raise Exception(stripe_payment['error'])
else:
payment = Payment.objects.create(
owner=self.owner, source=self.source, amount=amount)
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return payment
else:
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raise Exception('This payment method is unsupported/cannot be charged.')
def set_as_primary_for(self, user):
methods = PaymentMethod.objects.filter(owner=user, primary=True)
for method in methods:
print(method)
method.primary = False
method.save()
self.primary = True
self.save()
def get_primary_for(user):
methods = PaymentMethod.objects.filter(owner=user)
for method in methods:
# Do we want to do something with non-primary method?
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if method.active and method.primary:
return method
return None
class Meta:
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# TODO: limit to one primary method per user.
# unique_together is no good since it won't allow more than one
# non-primary method.
pass
###
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# Bills.
class BillingAddress(models.Model):
owner = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
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organization = models.CharField(max_length=100, blank=True, null=True)
name = models.CharField(max_length=100)
street = models.CharField(max_length=100)
city = models.CharField(max_length=50)
postal_code = models.CharField(max_length=50)
country = CountryField(blank=True)
vat_number = models.CharField(max_length=100, default="", blank=True)
active = models.BooleanField(default=False)
class Meta:
constraints = [
models.UniqueConstraint(fields=['owner'],
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condition=Q(active=True),
name='one_active_billing_address_per_user')
]
@staticmethod
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def get_address_for(user):
return BillingAddress.objects.get(owner=user, active=True)
def __str__(self):
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return "{} - {}, {}, {} {}, {}".format(
self.owner,
self.name, self.street, self.postal_code, self.city,
self.country)
###
# VAT
class VATRate(models.Model):
starting_date = models.DateField(blank=True, null=True)
ending_date = models.DateField(blank=True, null=True)
territory_codes = models.TextField(blank=True, default='')
currency_code = models.CharField(max_length=10)
rate = models.FloatField()
rate_type = models.TextField(blank=True, default='')
description = models.TextField(blank=True, default='')
@staticmethod
def get_for_country(country_code):
vat_rate = None
try:
vat_rate = VATRate.objects.get(
territory_codes=country_code, start_date__isnull=False, stop_date=None
)
return vat_rate.rate
except VATRate.DoesNotExist as dne:
logger.debug(str(dne))
logger.debug("Did not find VAT rate for %s, returning 0" % country_code)
return 0
###
# Orders.
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class Order(models.Model):
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"""
Order are assumed IMMUTABLE and used as SOURCE OF TRUST for generating
bills. Do **NOT** mutate then!
"""
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owner = models.ForeignKey(get_user_model(),
on_delete=models.CASCADE,
editable=True)
billing_address = models.ForeignKey(BillingAddress,
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.
creation_date = models.DateTimeField(auto_now_add=True)
starting_date = models.DateTimeField(default=timezone.now)
ending_date = models.DateTimeField(blank=True, null=True)
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recurring_period = models.IntegerField(choices = RecurringPeriod.choices,
default = RecurringPeriod.PER_30D)
price = models.DecimalField(default=0.0,
max_digits=AMOUNT_MAX_DIGITS,
decimal_places=AMOUNT_DECIMALS,
validators=[MinValueValidator(0)])
replaces = models.ForeignKey('self',
related_name='replaced_by',
on_delete=models.CASCADE,
blank=True,
null=True)
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depends_on = models.ForeignKey('self',
related_name='parent_of',
on_delete=models.CASCADE,
blank=True,
null=True)
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@property
def earliest_ending_date(self):
"""
Recurring orders cannot end before finishing at least one recurring period.
One time orders have a recurring period of 0, so this work universally
"""
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return self.starting_date + datetime.timedelta(seconds=self.recurring_period)
@property
def count_billed(self):
"""
How many times this order was billed so far.
This logic is mainly thought to be for recurring bills, but also works for one time bills
"""
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return sum([ br.quantity for br in self.bill_records.all() ])
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@property
def is_recurring(self):
return not self.recurring_period == RecurringPeriod.ONE_TIME
@property
def is_one_time(self):
return not self.is_recurring
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def replace_with(self, new_order):
new_order.replaces = self
self.ending_date = new_order.starting_date - datetime.timedelta(seconds=1)
self.save()
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def save(self, *args, **kwargs):
if self.ending_date and self.ending_date < self.starting_date:
raise ValidationError("End date cannot be before starting date")
if self.ending_date and self.ending_date < self.earliest_ending_date:
raise ValidationError("Ending date is before minimum duration (starting_date + recurring period)")
super().save(*args, **kwargs)
def __str__(self):
return f"{self.description} (order={self.id})"
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class Bill(models.Model):
"""
A bill is a representation of usage at a specific time
"""
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owner = models.ForeignKey(get_user_model(),
on_delete=models.CASCADE)
creation_date = models.DateTimeField(auto_now_add=True)
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starting_date = models.DateTimeField(default=start_of_this_month)
ending_date = models.DateTimeField()
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due_date = models.DateField(default=default_payment_delay)
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billing_address = models.ForeignKey(BillingAddress,
on_delete=models.CASCADE,
editable=True,
null=False)
# FIXME: editable=True -> is in the admin, but also editable in DRF
is_final = models.BooleanField(default=False)
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class Meta:
constraints = [
models.UniqueConstraint(fields=['owner',
'starting_date',
'ending_date' ],
name='one_bill_per_month_per_user')
]
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def __str__(self):
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return f"Bill {self.owner}-{self.id}"
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def close(self):
"""
Close/finish a bill
"""
self.is_final = True
self.save()
@property
def sum(self):
bill_records = BillRecord.objects.filter(bill=self)
return sum([ br.sum for br in bill_records ])
@classmethod
def create_bills_for_all_users(cls):
"""
Create bills for all users
"""
for owner in get_user_model().objects.all():
cls.create_next_bills_for_user(owner)
@classmethod
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def create_next_bills_for_user(cls, owner, ending_date=None):
"""
Create one bill per billing address, as the VAT rates might be different
for each address
"""
bills = []
for billing_address in BillingAddress.objects.filter(owner=owner):
bills.append(cls.create_next_bill_for_user_address(owner, billing_address, ending_date))
return bills
@classmethod
def create_next_bill_for_user_address(cls, owner, billing_address, ending_date=None):
last_bill = cls.objects.filter(owner=owner, billing_address=billing_address).order_by('id').last()
# it is important to sort orders here, as bill records will be
# created (and listed) in this order
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all_orders = Order.objects.filter(owner=owner, billing_address=billing_address).order_by('id')
first_order = all_orders.first()
bill = None
ending_date = None
# Get date & bill from previous bill
if last_bill:
if not last_bill.is_final:
bill = last_bill
starting_date = last_bill.starting_date
ending_date = bill.ending_date
else:
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starting_date = last_bill.ending_date + datetime.timedelta(seconds=1)
else:
if first_order:
starting_date = first_order.starting_date
else:
starting_date = timezone.now()
if not ending_date:
ending_date = end_of_month(starting_date)
if not bill:
bill = cls.objects.create(
owner=owner,
starting_date=starting_date,
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ending_date=ending_date,
billing_address=billing_address)
for order in all_orders:
if order.is_one_time:
# this code should be ok, but needs to be double checked
if order.billrecord_set.count() == 0:
br = BillRecord.objects.create(bill=bill,
order=order,
starting_date=order.starting_date,
ending_date=order.ending_date)
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else:
# Bill all recurring orders
bill_record_for_this_bill = BillRecord.objects.filter(bill=bill,
order=order).first()
# This bill already has a bill record for the order
# We potentially need to update the ending_date if the ending_date
# of the bill changed.
if bill_record_for_this_bill:
# we may need to adjust it, but let's do this logic another time
# If the order has an ending date set, we might need to adjust the bill_record
if order.ending_date:
if bill_record_for_this_bill.ending_date != order.ending_date:
bill_record_for_this_bill.ending_date = order.ending_date
else:
# recurring, not terminated, should go until at least end of bill
if bill_record_for_this_bill.ending_date < bill.ending_date:
bill_record_for_this_bill.ending_date = bill.ending_date
bill_record_for_this_bill.save()
else:
# No bill record in this bill for the order yet
# Find out whether it was already billed for the billing period of
# this bill
last_bill_record = BillRecord.objects.filter(order=order).order_by('id').last()
# Default starting date
this_starting_date=order.starting_date
# Skip billing again, if we have been processed for this bill duration
if last_bill_record:
if last_bill_record.ending_date >= bill.ending_date:
continue
# If the order ended and has been fully billed - do not process it
# anymore
if order.ending_date:
if last_bill_record.ending_date == order.ending_date:
# FIXME: maybe mark order for not processing anymore?
# I imagina a boolean column, once this code is stable and
# verified
continue
# Catch programming bugs if the last bill_record was
# created incorrectly - should never be entered!
if order.ending_date < last_bill_record.ending_date:
raise ValidationError(f"Order {order.id} ends before last bill record {last_bill_record.id}")
# Start right after last billing run
this_starting_date = last_bill_record.ending_date + datetime.timedelta(seconds=1)
# If the order is already terminated, use that date instead of bill date
if order.ending_date:
this_ending_date = order.ending_date
else:
if order.earliest_ending_date > bill.ending_date:
this_ending_date = order.earliest_ending_date
else:
# bill at maximum for this billing period
this_ending_date = bill.ending_date
# And finally create a new billrecord!
br = BillRecord.objects.create(bill=bill,
order=order,
starting_date=this_starting_date,
ending_date=this_ending_date)
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# Filtering ideas:
# If order is replaced, it should not be added anymore if it has been billed "last time"
# If order has ended and finally charged, do not charge anymore
# Find out the last billrecord for the order, if there is none, bill from the starting date
return bill
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class BillRecord(models.Model):
"""
Entry of a bill, dynamically generated from an order.
"""
bill = models.ForeignKey(Bill, on_delete=models.CASCADE)
order = models.ForeignKey(Order, on_delete=models.CASCADE)
creation_date = models.DateTimeField(auto_now_add=True)
starting_date = models.DateTimeField()
ending_date = models.DateTimeField()
@property
def quantity(self):
""" Determine the quantity by the duration"""
if self.order.is_one_time:
return 1
record_delta = self.ending_date - self.starting_date
return record_delta.total_seconds()/self.order.recurring_period
@property
def sum(self):
return self.order.price * Decimal(self.quantity)
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def __str__(self):
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return f"{self.bill}: {self.quantity} x {self.order}"
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def save(self, *args, **kwargs):
if self.ending_date < self.starting_date:
raise ValidationError("End date cannot be before starting date")
super().save(*args, **kwargs)
###
# Products
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class Product(UncloudModel):
owner = models.ForeignKey(get_user_model(),
on_delete=models.CASCADE,
editable=False)
description = "Generic Product"
orders = models.ManyToManyField(Order)
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_order_at(self, when_to_start=None, recurring_period=None):
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billing_address = BillingAddress.get_address_for(self.owner)
if not billing_address:
raise ValidationError("Cannot order without a billing address")
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if not when_to_start:
when_to_start = timezone.now()
if not recurring_period:
recurring_period = self.default_recurring_period
if self.one_time_price > 0:
one_time_order = Order.objects.create(owner=self.owner,
billing_address=billing_address,
starting_date=when_to_start,
price=self.one_time_price,
recurring_period=RecurringPeriod.ONE_TIME,
description=str(self))
self.orders.add(one_time_order)
else:
one_time_order = None
if recurring_period != RecurringPeriod.ONE_TIME:
if one_time_order:
recurring_order = Order.objects.create(owner=self.owner,
billing_address=billing_address,
starting_date=when_to_start,
price=self.recurring_price,
recurring_period=recurring_period,
depends_on=one_time_order,
description=str(self))
else:
recurring_order = Order.objects.create(owner=self.owner,
billing_address=billing_address,
starting_date=when_to_start,
price=self.recurring_price,
recurring_period=recurring_period,
description=str(self))
self.orders.add(recurring_order)
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def create_or_update_recurring_order(self, when_to_start=None, recurring_period=None):
if not when_to_start:
when_to_start = timezone.now()
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current_recurring_order = Order.objects.filter(
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# NEXT: find the latest order, use that one...
# Update order = create new order
if self.order:
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previous_order = self.order
when_to_end = end_before(when_to_start)
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new_order = Order.objects.create(owner=self.owner,
billing_address=self.order.billing_address,
starting_date=when_to_start,
price=self.recurring_price,
recurring_period=recurring_period,
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description=str(self),
replaces=self.order)
print(new_order)
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self.order.end_date = when_to_end
self.order.save()
self.order = new_order
else:
return self.create_order_at(when_to_start, recurring_period)
@property
def recurring_price(self):
""" implement correct values in the child class """
return 0
@property
def one_time_price(self):
""" implement correct values in the child class """
return 0
@property
def is_recurring(self):
return self.recurring_price > 0
@property
def billing_address(self):
return self.order.billing_address
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@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")
# Sample products included into uncloud
class SampleOneTimeProduct(Product):
default_recurring_period = RecurringPeriod.ONE_TIME
@property
def one_time_price(self):
return 5
class SampleRecurringProduct(Product):
default_recurring_period = RecurringPeriod.PER_30D
@property
def recurring_price(self):
return 10
class SampleRecurringProductOneTimeFee(Product):
default_recurring_period = RecurringPeriod.PER_30D
@property
def one_time_price(self):
return 5
@property
def recurring_price(self):
return 1