Merge branch 'vat-handling' into 'master'

VAT support handling

See merge request uncloud/uncloud!7

uncloud_django_based/uncloud/requirements.txt

@@ -18,3 +18,7 @@ django-hardcopy
 # schema support
 pyyaml
 uritemplate
+
+# Comprehensive interface to validate VAT numbers, making use of the VIES
+# service for European countries.
+vat-validator

uncloud_django_based/uncloud/uncloud/urls.py

@@ -53,10 +53,11 @@ router.register(r'net/vpnreservation', netviews.VPNNetworkReservationViewSet, ba
 
 
 # Pay
-router.register(r'payment-method', payviews.PaymentMethodViewSet, basename='payment-method')
+router.register(r'address', payviews.BillingAddressViewSet, basename='address')
 router.register(r'bill', payviews.BillViewSet, basename='bill')
 router.register(r'order', payviews.OrderViewSet, basename='order')
 router.register(r'payment', payviews.PaymentViewSet, basename='payment')
+router.register(r'payment-method', payviews.PaymentMethodViewSet, basename='payment-method')
 
 
 # admin/staff urls

uncloud_django_based/uncloud/uncloud_pay/management/commands/import-vat-rates.py

@@ -0,0 +1,44 @@
+from django.core.management.base import BaseCommand
+from uncloud_pay.models import VATRate
+import csv
+
+
+class Command(BaseCommand):
+    help = '''Imports VAT Rates. Assume vat rates of format https://github.com/kdeldycke/vat-rates/blob/master/vat_rates.csv'''
+
+    def add_arguments(self, parser):
+        parser.add_argument('csv_file', nargs='+', type=str)
+
+    def handle(self, *args, **options):
+        try:
+            for c_file in options['csv_file']:
+                print("c_file =  %s" % c_file)
+                with open(c_file, mode='r') as csv_file:
+                    csv_reader = csv.DictReader(csv_file)
+                    line_count = 0
+                    for row in csv_reader:
+                        if line_count == 0:
+                            line_count += 1
+                        obj, created = VATRate.objects.get_or_create(
+                            start_date=row["start_date"],
+                            stop_date=row["stop_date"] if row["stop_date"] is not "" else None,
+                            territory_codes=row["territory_codes"],
+                            currency_code=row["currency_code"],
+                            rate=row["rate"],
+                            rate_type=row["rate_type"],
+                            description=row["description"]
+                        )
+                        if created:
+                            self.stdout.write(self.style.SUCCESS(
+                                '%s. %s - %s - %s - %s' % (
+                                    line_count,
+                                    obj.start_date,
+                                    obj.stop_date,
+                                    obj.territory_codes,
+                                    obj.rate
+                                )
+                            ))
+                            line_count+=1
+
+        except Exception as e:
+            print(" *** Error occurred. Details {}".format(str(e)))

uncloud_django_based/uncloud/uncloud_pay/migrations/0006_auto_20200415_1003.py

@@ -0,0 +1,31 @@
+# Generated by Django 3.0.5 on 2020-04-15 10:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0005_auto_20200413_0924'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='VATRate',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('start_date', models.DateField(blank=True, null=True)),
+                ('stop_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='')),
+            ],
+        ),
+        migrations.AlterField(
+            model_name='order',
+            name='recurring_period',
+            field=models.CharField(choices=[('ONCE', 'Onetime'), ('YEAR', 'Per Year'), ('MONTH', 'Per Month'), ('WEEK', 'Per Week'), ('DAY', 'Per Day'), ('HOUR', 'Per Hour'), ('MINUTE', 'Per Minute'), ('SECOND', 'Per Second')], default='MONTH', max_length=32),
+        ),
+    ]

uncloud_django_based/uncloud/uncloud_pay/models.py

@@ -9,10 +9,10 @@ from django.core.exceptions import ObjectDoesNotExist
 import uuid
 import logging
 from functools import reduce
+import itertools
 from math import ceil
 from datetime import timedelta
 from calendar import monthrange
-
 from decimal import Decimal
 
 import uncloud_pay.stripe
@@ -33,6 +33,248 @@ decimal.getcontext().prec = AMOUNT_DECIMALS + 1
 # Used to generate bill due dates.
 BILL_PAYMENT_DELAY=timedelta(days=10)
 
+# http://xml.coverpages.org/country3166.html
+COUNTRIES = (
+    ('AD', _('Andorra')),
+    ('AE', _('United Arab Emirates')),
+    ('AF', _('Afghanistan')),
+    ('AG', _('Antigua & Barbuda')),
+    ('AI', _('Anguilla')),
+    ('AL', _('Albania')),
+    ('AM', _('Armenia')),
+    ('AN', _('Netherlands Antilles')),
+    ('AO', _('Angola')),
+    ('AQ', _('Antarctica')),
+    ('AR', _('Argentina')),
+    ('AS', _('American Samoa')),
+    ('AT', _('Austria')),
+    ('AU', _('Australia')),
+    ('AW', _('Aruba')),
+    ('AZ', _('Azerbaijan')),
+    ('BA', _('Bosnia and Herzegovina')),
+    ('BB', _('Barbados')),
+    ('BD', _('Bangladesh')),
+    ('BE', _('Belgium')),
+    ('BF', _('Burkina Faso')),
+    ('BG', _('Bulgaria')),
+    ('BH', _('Bahrain')),
+    ('BI', _('Burundi')),
+    ('BJ', _('Benin')),
+    ('BM', _('Bermuda')),
+    ('BN', _('Brunei Darussalam')),
+    ('BO', _('Bolivia')),
+    ('BR', _('Brazil')),
+    ('BS', _('Bahama')),
+    ('BT', _('Bhutan')),
+    ('BV', _('Bouvet Island')),
+    ('BW', _('Botswana')),
+    ('BY', _('Belarus')),
+    ('BZ', _('Belize')),
+    ('CA', _('Canada')),
+    ('CC', _('Cocos (Keeling) Islands')),
+    ('CF', _('Central African Republic')),
+    ('CG', _('Congo')),
+    ('CH', _('Switzerland')),
+    ('CI', _('Ivory Coast')),
+    ('CK', _('Cook Iislands')),
+    ('CL', _('Chile')),
+    ('CM', _('Cameroon')),
+    ('CN', _('China')),
+    ('CO', _('Colombia')),
+    ('CR', _('Costa Rica')),
+    ('CU', _('Cuba')),
+    ('CV', _('Cape Verde')),
+    ('CX', _('Christmas Island')),
+    ('CY', _('Cyprus')),
+    ('CZ', _('Czech Republic')),
+    ('DE', _('Germany')),
+    ('DJ', _('Djibouti')),
+    ('DK', _('Denmark')),
+    ('DM', _('Dominica')),
+    ('DO', _('Dominican Republic')),
+    ('DZ', _('Algeria')),
+    ('EC', _('Ecuador')),
+    ('EE', _('Estonia')),
+    ('EG', _('Egypt')),
+    ('EH', _('Western Sahara')),
+    ('ER', _('Eritrea')),
+    ('ES', _('Spain')),
+    ('ET', _('Ethiopia')),
+    ('FI', _('Finland')),
+    ('FJ', _('Fiji')),
+    ('FK', _('Falkland Islands (Malvinas)')),
+    ('FM', _('Micronesia')),
+    ('FO', _('Faroe Islands')),
+    ('FR', _('France')),
+    ('FX', _('France, Metropolitan')),
+    ('GA', _('Gabon')),
+    ('GB', _('United Kingdom (Great Britain)')),
+    ('GD', _('Grenada')),
+    ('GE', _('Georgia')),
+    ('GF', _('French Guiana')),
+    ('GH', _('Ghana')),
+    ('GI', _('Gibraltar')),
+    ('GL', _('Greenland')),
+    ('GM', _('Gambia')),
+    ('GN', _('Guinea')),
+    ('GP', _('Guadeloupe')),
+    ('GQ', _('Equatorial Guinea')),
+    ('GR', _('Greece')),
+    ('GS', _('South Georgia and the South Sandwich Islands')),
+    ('GT', _('Guatemala')),
+    ('GU', _('Guam')),
+    ('GW', _('Guinea-Bissau')),
+    ('GY', _('Guyana')),
+    ('HK', _('Hong Kong')),
+    ('HM', _('Heard & McDonald Islands')),
+    ('HN', _('Honduras')),
+    ('HR', _('Croatia')),
+    ('HT', _('Haiti')),
+    ('HU', _('Hungary')),
+    ('ID', _('Indonesia')),
+    ('IE', _('Ireland')),
+    ('IL', _('Israel')),
+    ('IN', _('India')),
+    ('IO', _('British Indian Ocean Territory')),
+    ('IQ', _('Iraq')),
+    ('IR', _('Islamic Republic of Iran')),
+    ('IS', _('Iceland')),
+    ('IT', _('Italy')),
+    ('JM', _('Jamaica')),
+    ('JO', _('Jordan')),
+    ('JP', _('Japan')),
+    ('KE', _('Kenya')),
+    ('KG', _('Kyrgyzstan')),
+    ('KH', _('Cambodia')),
+    ('KI', _('Kiribati')),
+    ('KM', _('Comoros')),
+    ('KN', _('St. Kitts and Nevis')),
+    ('KP', _('Korea, Democratic People\'s Republic of')),
+    ('KR', _('Korea, Republic of')),
+    ('KW', _('Kuwait')),
+    ('KY', _('Cayman Islands')),
+    ('KZ', _('Kazakhstan')),
+    ('LA', _('Lao People\'s Democratic Republic')),
+    ('LB', _('Lebanon')),
+    ('LC', _('Saint Lucia')),
+    ('LI', _('Liechtenstein')),
+    ('LK', _('Sri Lanka')),
+    ('LR', _('Liberia')),
+    ('LS', _('Lesotho')),
+    ('LT', _('Lithuania')),
+    ('LU', _('Luxembourg')),
+    ('LV', _('Latvia')),
+    ('LY', _('Libyan Arab Jamahiriya')),
+    ('MA', _('Morocco')),
+    ('MC', _('Monaco')),
+    ('MD', _('Moldova, Republic of')),
+    ('MG', _('Madagascar')),
+    ('MH', _('Marshall Islands')),
+    ('ML', _('Mali')),
+    ('MN', _('Mongolia')),
+    ('MM', _('Myanmar')),
+    ('MO', _('Macau')),
+    ('MP', _('Northern Mariana Islands')),
+    ('MQ', _('Martinique')),
+    ('MR', _('Mauritania')),
+    ('MS', _('Monserrat')),
+    ('MT', _('Malta')),
+    ('MU', _('Mauritius')),
+    ('MV', _('Maldives')),
+    ('MW', _('Malawi')),
+    ('MX', _('Mexico')),
+    ('MY', _('Malaysia')),
+    ('MZ', _('Mozambique')),
+    ('NA', _('Namibia')),
+    ('NC', _('New Caledonia')),
+    ('NE', _('Niger')),
+    ('NF', _('Norfolk Island')),
+    ('NG', _('Nigeria')),
+    ('NI', _('Nicaragua')),
+    ('NL', _('Netherlands')),
+    ('NO', _('Norway')),
+    ('NP', _('Nepal')),
+    ('NR', _('Nauru')),
+    ('NU', _('Niue')),
+    ('NZ', _('New Zealand')),
+    ('OM', _('Oman')),
+    ('PA', _('Panama')),
+    ('PE', _('Peru')),
+    ('PF', _('French Polynesia')),
+    ('PG', _('Papua New Guinea')),
+    ('PH', _('Philippines')),
+    ('PK', _('Pakistan')),
+    ('PL', _('Poland')),
+    ('PM', _('St. Pierre & Miquelon')),
+    ('PN', _('Pitcairn')),
+    ('PR', _('Puerto Rico')),
+    ('PT', _('Portugal')),
+    ('PW', _('Palau')),
+    ('PY', _('Paraguay')),
+    ('QA', _('Qatar')),
+    ('RE', _('Reunion')),
+    ('RO', _('Romania')),
+    ('RU', _('Russian Federation')),
+    ('RW', _('Rwanda')),
+    ('SA', _('Saudi Arabia')),
+    ('SB', _('Solomon Islands')),
+    ('SC', _('Seychelles')),
+    ('SD', _('Sudan')),
+    ('SE', _('Sweden')),
+    ('SG', _('Singapore')),
+    ('SH', _('St. Helena')),
+    ('SI', _('Slovenia')),
+    ('SJ', _('Svalbard & Jan Mayen Islands')),
+    ('SK', _('Slovakia')),
+    ('SL', _('Sierra Leone')),
+    ('SM', _('San Marino')),
+    ('SN', _('Senegal')),
+    ('SO', _('Somalia')),
+    ('SR', _('Suriname')),
+    ('ST', _('Sao Tome & Principe')),
+    ('SV', _('El Salvador')),
+    ('SY', _('Syrian Arab Republic')),
+    ('SZ', _('Swaziland')),
+    ('TC', _('Turks & Caicos Islands')),
+    ('TD', _('Chad')),
+    ('TF', _('French Southern Territories')),
+    ('TG', _('Togo')),
+    ('TH', _('Thailand')),
+    ('TJ', _('Tajikistan')),
+    ('TK', _('Tokelau')),
+    ('TM', _('Turkmenistan')),
+    ('TN', _('Tunisia')),
+    ('TO', _('Tonga')),
+    ('TP', _('East Timor')),
+    ('TR', _('Turkey')),
+    ('TT', _('Trinidad & Tobago')),
+    ('TV', _('Tuvalu')),
+    ('TW', _('Taiwan, Province of China')),
+    ('TZ', _('Tanzania, United Republic of')),
+    ('UA', _('Ukraine')),
+    ('UG', _('Uganda')),
+    ('UM', _('United States Minor Outlying Islands')),
+    ('US', _('United States of America')),
+    ('UY', _('Uruguay')),
+    ('UZ', _('Uzbekistan')),
+    ('VA', _('Vatican City State (Holy See)')),
+    ('VC', _('St. Vincent & the Grenadines')),
+    ('VE', _('Venezuela')),
+    ('VG', _('British Virgin Islands')),
+    ('VI', _('United States Virgin Islands')),
+    ('VN', _('Viet Nam')),
+    ('VU', _('Vanuatu')),
+    ('WF', _('Wallis & Futuna Islands')),
+    ('WS', _('Samoa')),
+    ('YE', _('Yemen')),
+    ('YT', _('Mayotte')),
+    ('YU', _('Yugoslavia')),
+    ('ZA', _('South Africa')),
+    ('ZM', _('Zambia')),
+    ('ZR', _('Zaire')),
+    ('ZW', _('Zimbabwe')),
+)
+
 # Initialize logger.
 logger = logging.getLogger(__name__)
 
@@ -47,7 +289,16 @@ class RecurringPeriod(models.TextChoices):
     PER_MINUTE = 'MINUTE', _('Per Minute')
     PER_SECOND = 'SECOND', _('Per Second')
 
+class CountryField(models.CharField):
+    def __init__(self, *args, **kwargs):
+        kwargs.setdefault('choices', COUNTRIES)
+        kwargs.setdefault('default', 'CH')
+        kwargs.setdefault('max_length', 2)
 
+        super(CountryField, self).__init__(*args, **kwargs)
+
+    def get_internal_type(self):
+        return "CharField"
 
 def get_balance_for_user(user):
     bills = reduce(
@@ -189,6 +440,58 @@ class PaymentMethod(models.Model):
 ###
 # Bills.
 
+class BillingAddress(models.Model):
+    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    owner = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
+
+    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)
+
+    @staticmethod
+    def get_addresses_for(user):
+        return BillingAddress.objects.filter(owner=user)
+
+    @staticmethod
+    def get_preferred_address_for(user):
+        addresses = get_addresses_for(user)
+        if len(addresses) == 0:
+            return None
+        else:
+            # TODO: allow user to set primary/preferred address
+            return addresses[0]
+
+    def __str__(self):
+        return "{}, {}, {} {}, {}".format(
+                self.name, self.street, self.postal_code, self.city,
+                self.country)
+
+# Populated with the import-vat-numbers django command.
+class VATRate(models.Model):
+    start_date = models.DateField(blank=True, null=True)
+    stop_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
+
 class Bill(models.Model):
     uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     owner = models.ForeignKey(get_user_model(),
@@ -225,9 +528,17 @@ class Bill(models.Model):
         return bill_records
 
     @property
-    def total(self):
+    def amount(self):
         return reduce(lambda acc, record: acc + record.amount, self.records, 0)
 
+    @property
+    def vat_amount(self):
+        return reduce(lambda acc, record: acc + record.vat_amount, self.records, 0)
+
+    @property
+    def total(self):
+        return self.amount + self.vat_amount
+
     @property
     def final(self):
         # A bill is final when its ending date is passed.
@@ -242,6 +553,14 @@ class Bill(models.Model):
                         product.status = UncloudStatus.PENDING
                         product.save()
 
+    @property
+    def billing_address(self):
+        orders = Order.objects.filter(bill=self)
+        # The genrate_for method makes sure all the orders of a bill share the
+        # same billing address. TODO: It would be nice to enforce that somehow...
+        return orders[0].billing_address
+
+    # TODO: split this huuuge method!
     @staticmethod
     def generate_for(year, month, user):
         # /!\ We exclusively work on the specified year and month.
@@ -300,6 +619,13 @@ class Bill(models.Model):
             prepaid_due_date = min(creation_date, starting_date) + BILL_PAYMENT_DELAY
             postpaid_due_date = max(creation_date, ending_date) + BILL_PAYMENT_DELAY
 
+            # There should not be any bill linked to orders with different
+            # billing addresses.
+            per_address_orders = itertools.groupby(
+                    unpaid_orders['monthly_or_less'],
+                    lambda o: o.billing_address)
+
+            for addr, bill_orders in per_address_orders:
                 next_monthly_bill = Bill.objects.create(owner=user,
                     creation_date=creation_date,
                     starting_date=starting_date, # FIXME: this is a hack!
@@ -308,7 +634,7 @@ class Bill(models.Model):
 
                 # It is not possible to register many-to-many relationship before
                 # the two end-objects are saved in database.
-            for order in unpaid_orders['monthly_or_less']:
+                for order in bill_orders:
                     order.bill.add(next_monthly_bill)
 
                 logger.info("Generated monthly bill {} (amount: {}) for user {}."
@@ -319,7 +645,6 @@ class Bill(models.Model):
 
         # Handle yearly bills starting on working month.
         if len(unpaid_orders['yearly']) > 0:
-
             # For every starting date, generate new bill.
             for next_yearly_bill_start_on in unpaid_orders['yearly']:
                 # No postpaid for yearly payments.
@@ -328,6 +653,13 @@ class Bill(models.Model):
                 ending_date = next_yearly_bill_start_on.replace(
                         year=next_yearly_bill_start_on.year+1) - timedelta(days=1)
 
+                # There should not be any bill linked to orders with different
+                # billing addresses.
+                per_address_orders = itertools.groupby(
+                        unpaid_orders['yearly'][next_yearly_bill_start_on],
+                        lambda o: o.billing_address)
+
+                for addr, bill_orders in per_address_orders:
                     next_yearly_bill = Bill.objects.create(owner=user,
                             creation_date=creation_date,
                             starting_date=next_yearly_bill_start_on,
@@ -336,7 +668,7 @@ class Bill(models.Model):
 
                     # It is not possible to register many-to-many relationship before
                     # the two end-objects are saved in database.
-                for order in unpaid_orders['yearly'][next_yearly_bill_start_on]:
+                    for order in bill_orders:
                         order.bill.add(next_yearly_bill)
 
                     logger.info("Generated yearly bill {} (amount: {}) for user {}."
@@ -449,10 +781,22 @@ class BillRecord():
             raise Exception('Unsupported recurring period: {}.'.
                     format(record.recurring_period))
 
+    @property
+    def vat_rate(self):
+        return Decimal(VATRate.get_for_country(self.bill.billing_address.country))
+
+    @property
+    def vat_amount(self):
+        return self.amount * self.vat_rate
+
     @property
     def amount(self):
         return Decimal(float(self.recurring_price) * self.recurring_count) + self.one_time_price
 
+    @property
+    def total(self):
+        return self.amount + self.vat_amount
+
 ###
 # Orders.
 
@@ -463,6 +807,7 @@ class Order(models.Model):
     owner = models.ForeignKey(get_user_model(),
                               on_delete=models.CASCADE,
                               editable=False)
+    billing_address = models.ForeignKey(BillingAddress, on_delete=models.CASCADE)
 
     # TODO: enforce ending_date - starting_date to be larger than recurring_period.
     creation_date = models.DateTimeField(auto_now_add=True)
@@ -579,12 +924,12 @@ class Product(UncloudModel):
         if being_created:
             record = OrderRecord(
                 one_time_price=self.one_time_price,
-                recurring_price=self.recurring_price(recurring_period=self.recurring_period),
+                recurring_price=self.recurring_price,
                 description=self.description)
             self.order.orderrecord_set.add(record, bulk=False)
 
     @property
-    def recurring_price(self, recurring_period=RecurringPeriod.PER_MONTH):
+    def recurring_price(self):
         pass # To be implemented in child.
 
     @property
@@ -595,6 +940,10 @@ class Product(UncloudModel):
     def recurring_period(self):
         return self.order.recurring_period
 
+    @property
+    def billing_address(self):
+        return self.order.billing_address
+
     @staticmethod
     def allowed_recurring_periods():
         return RecurringPeriod.choices

uncloud_django_based/uncloud/uncloud_pay/serializers.py

@@ -57,15 +57,33 @@ class BillRecordSerializer(serializers.Serializer):
             view_name='order-detail',
             read_only=True)
     description = serializers.CharField()
-    recurring_period = serializers.CharField()
+    one_time_price = serializers.DecimalField(AMOUNT_MAX_DIGITS, AMOUNT_DECIMALS)
-    recurring_price = serializers.DecimalField(max_digits=10, decimal_places=2)
+    recurring_price = serializers.DecimalField(AMOUNT_MAX_DIGITS, AMOUNT_DECIMALS)
-    recurring_count = serializers.DecimalField(max_digits=10, decimal_places=2)
+    recurring_period = serializers.ChoiceField(choices=RecurringPeriod.choices)
-    one_time_price = serializers.DecimalField(max_digits=10, decimal_places=2)
+    recurring_count = serializers.DecimalField(AMOUNT_MAX_DIGITS, AMOUNT_DECIMALS)
-    amount = serializers.DecimalField(max_digits=10, decimal_places=2)
+    vat_rate = serializers.DecimalField(AMOUNT_MAX_DIGITS, AMOUNT_DECIMALS)
+    vat_amount = serializers.DecimalField(AMOUNT_MAX_DIGITS, AMOUNT_DECIMALS)
+    amount = serializers.DecimalField(AMOUNT_MAX_DIGITS, AMOUNT_DECIMALS)
+    total = serializers.DecimalField(AMOUNT_MAX_DIGITS, AMOUNT_DECIMALS)
+
+class BillingAddressSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = BillingAddress
+        fields = ['uuid', 'name', 'street', 'city', 'postal_code', 'country', 'vat_number']
 
 class BillSerializer(serializers.ModelSerializer):
+    billing_address = BillingAddressSerializer(read_only=True)
     records = BillRecordSerializer(many=True, read_only=True)
+
     class Meta:
         model = Bill
-        fields = ['reference', 'owner', 'total', 'due_date', 'creation_date',
+        fields = ['reference', 'owner', 'amount', 'vat_amount', 'total',
-                'starting_date', 'ending_date', 'records', 'final']
+                'due_date', 'creation_date', 'starting_date', 'ending_date',
+                'records', 'final', 'billing_address']
+
+# We do not want users to mutate the country / VAT number of an address, as it
+# will change VAT on existing bills.
+class UpdateBillingAddressSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = BillingAddress
+        fields = ['uuid', 'street', 'city', 'postal_code']

uncloud_django_based/uncloud/uncloud_pay/tests.py

@@ -10,6 +10,11 @@ class BillingTestCase(TestCase):
         self.user = get_user_model().objects.create(
                 username='jdoe',
                 email='john.doe@domain.tld')
+        self.billing_address = BillingAddress.objects.create(
+                owner=self.user,
+                street="unknown",
+                city="unknown",
+                postal_code="unknown")
 
     def test_basic_monthly_billing(self):
         one_time_price = 10
@@ -25,24 +30,25 @@ class BillingTestCase(TestCase):
                 owner=self.user,
                 starting_date=starting_date,
                 ending_date=ending_date,
-                recurring_period=RecurringPeriod.PER_MONTH)
+                recurring_period=RecurringPeriod.PER_MONTH,
+                billing_address=self.billing_address)
         order.add_record(one_time_price, recurring_price, description)
 
         # Generate & check bill for first month: full recurring_price + setup.
         first_month_bills = order.bills # Initial bill generated at order creation.
         self.assertEqual(len(first_month_bills), 1)
-        self.assertEqual(first_month_bills[0].total, one_time_price + recurring_price)
+        self.assertEqual(first_month_bills[0].amount, one_time_price + recurring_price)
 
         # Generate & check bill for second month: full recurring_price.
         second_month_bills = Bill.generate_for(2020, 4, self.user)
         self.assertEqual(len(second_month_bills), 1)
-        self.assertEqual(second_month_bills[0].total, recurring_price)
+        self.assertEqual(second_month_bills[0].amount, recurring_price)
 
         # Generate & check bill for third and last month: partial recurring_price.
         third_month_bills = Bill.generate_for(2020, 5, self.user)
         self.assertEqual(len(third_month_bills), 1)
         # 31 days in May.
-        self.assertEqual(float(third_month_bills[0].total),
+        self.assertEqual(float(third_month_bills[0].amount),
                 round((7/31) * recurring_price, AMOUNT_DECIMALS))
 
         # Check that running Bill.generate_for() twice does not create duplicates.
@@ -59,7 +65,8 @@ class BillingTestCase(TestCase):
         order = Order.objects.create(
                 owner=self.user,
                 starting_date=starting_date,
-                recurring_period=RecurringPeriod.PER_YEAR)
+                recurring_period=RecurringPeriod.PER_YEAR,
+                billing_address=self.billing_address)
         order.add_record(one_time_price, recurring_price, description)
 
         # Generate & check bill for first year: recurring_price + setup.
@@ -69,7 +76,7 @@ class BillingTestCase(TestCase):
                 date.fromisoformat('2020-03-31'))
         self.assertEqual(first_year_bills[0].ending_date.date(),
                 date.fromisoformat('2021-03-30'))
-        self.assertEqual(first_year_bills[0].total,
+        self.assertEqual(first_year_bills[0].amount,
                 recurring_price + one_time_price)
 
         # Generate & check bill for second year: recurring_price.
@@ -79,7 +86,7 @@ class BillingTestCase(TestCase):
                 date.fromisoformat('2021-03-31'))
         self.assertEqual(second_year_bills[0].ending_date.date(),
                 date.fromisoformat('2022-03-30'))
-        self.assertEqual(second_year_bills[0].total, recurring_price)
+        self.assertEqual(second_year_bills[0].amount, recurring_price)
 
         # Check that running Bill.generate_for() twice does not create duplicates.
         self.assertEqual(len(Bill.generate_for(2020, 3, self.user)), 0)
@@ -100,19 +107,20 @@ class BillingTestCase(TestCase):
                 owner=self.user,
                 starting_date=starting_date,
                 ending_date=ending_date,
-                recurring_period=RecurringPeriod.PER_HOUR)
+                recurring_period=RecurringPeriod.PER_HOUR,
+                billing_address=self.billing_address)
         order.add_record(one_time_price, recurring_price, description)
 
         # Generate & check bill for first month: recurring_price + setup.
         first_month_bills = order.bills
         self.assertEqual(len(first_month_bills), 1)
-        self.assertEqual(float(first_month_bills[0].total),
+        self.assertEqual(float(first_month_bills[0].amount),
                 round(16 * recurring_price, AMOUNT_DECIMALS) + one_time_price)
 
         # Generate & check bill for first month: recurring_price.
         second_month_bills = Bill.generate_for(2020, 4, self.user)
         self.assertEqual(len(second_month_bills), 1)
-        self.assertEqual(float(second_month_bills[0].total),
+        self.assertEqual(float(second_month_bills[0].amount),
                 round(12 * recurring_price, AMOUNT_DECIMALS))
 
 class ProductActivationTestCase(TestCase):
@@ -121,14 +129,20 @@ class ProductActivationTestCase(TestCase):
                 username='jdoe',
                 email='john.doe@domain.tld')
 
+        self.billing_address = BillingAddress.objects.create(
+                owner=self.user,
+                street="unknown",
+                city="unknown",
+                postal_code="unknown")
+
     def test_product_activation(self):
         starting_date = datetime.fromisoformat('2020-03-01')
 
         order = Order.objects.create(
                 owner=self.user,
                 starting_date=starting_date,
-                recurring_period=RecurringPeriod.PER_MONTH)
+                recurring_period=RecurringPeriod.PER_MONTH,
-        order.save()
+                billing_address=self.billing_address)
 
         product = GenericServiceProduct(
                 custom_description="Test product",
@@ -139,16 +153,76 @@ class ProductActivationTestCase(TestCase):
         product.save()
 
         # XXX: to be automated.
-        order.add_record(product.one_time_price, product.recurring_price(), product.description)
+        order.add_record(product.one_time_price, product.recurring_price, product.description)
 
         # Validate initial state: must be awaiting payment.
         self.assertEqual(product.status, UncloudStatus.AWAITING_PAYMENT)
 
         # Pay initial bill, check that product is activated.
-        amount = product.order.bills[0].total
+        amount = product.order.bills[0].amount
         payment = Payment(owner=self.user, amount=amount)
         payment.save()
         self.assertEqual(
                 GenericServiceProduct.objects.get(uuid=product.uuid).status,
                 UncloudStatus.PENDING
                 )
+
+class BillingAddressTestCase(TestCase):
+    def setUp(self):
+        self.user = get_user_model().objects.create(
+                username='jdoe',
+                email='john.doe@domain.tld')
+
+        self.billing_address_01 = BillingAddress.objects.create(
+                owner=self.user,
+                street="unknown1",
+                city="unknown1",
+                postal_code="unknown1",
+                country="CH")
+
+        self.billing_address_02 = BillingAddress.objects.create(
+                owner=self.user,
+                street="unknown2",
+                city="unknown2",
+                postal_code="unknown2",
+                country="CH")
+
+    def test_billing_with_single_address(self):
+        # Create new orders somewhere in the past so that we do not encounter
+        # auto-created initial bills.
+        starting_date = datetime.fromisoformat('2020-03-01')
+
+        order_01 = Order.objects.create(
+                owner=self.user,
+                starting_date=starting_date,
+                recurring_period=RecurringPeriod.PER_MONTH,
+                billing_address=self.billing_address_01)
+        order_02 = Order.objects.create(
+                owner=self.user,
+                starting_date=starting_date,
+                recurring_period=RecurringPeriod.PER_MONTH,
+                billing_address=self.billing_address_01)
+
+        # We need a single bill since we work with a single address.
+        bills = Bill.generate_for(2020, 4, self.user)
+        self.assertEqual(len(bills), 1)
+
+    def test_billing_with_multiple_addresses(self):
+        # Create new orders somewhere in the past so that we do not encounter
+        # auto-created initial bills.
+        starting_date = datetime.fromisoformat('2020-03-01')
+
+        order_01 = Order.objects.create(
+                owner=self.user,
+                starting_date=starting_date,
+                recurring_period=RecurringPeriod.PER_MONTH,
+                billing_address=self.billing_address_01)
+        order_02 = Order.objects.create(
+                owner=self.user,
+                starting_date=starting_date,
+                recurring_period=RecurringPeriod.PER_MONTH,
+                billing_address=self.billing_address_02)
+
+        # We need different bills since we work with different addresses.
+        bills = Bill.generate_for(2020, 4, self.user)
+        self.assertEqual(len(bills), 2)

uncloud_django_based/uncloud/uncloud_pay/views.py

@@ -1,20 +1,26 @@
 from django.shortcuts import render
 from django.db import transaction
 from django.contrib.auth import get_user_model
-from rest_framework import viewsets, permissions, status, views
+from rest_framework import viewsets, mixins, permissions, status, views
 from rest_framework.renderers import TemplateHTMLRenderer
 from rest_framework.response import Response
 from rest_framework.decorators import action
 from rest_framework.reverse import reverse
 from rest_framework.decorators import renderer_classes
+from vat_validator import validate_vat, vies
+from vat_validator.countries import EU_COUNTRY_CODES
 
 import json
+import logging
 
 from .models import *
 from .serializers import *
 from datetime import datetime
+from vat_validator import sanitize_vat
 import uncloud_pay.stripe as uncloud_stripe
 
+logger = logging.getLogger(__name__)
+
 ###
 # Payments and Payment Methods.
 
@@ -187,6 +193,53 @@ class OrderViewSet(viewsets.ReadOnlyModelViewSet):
     def get_queryset(self):
         return Order.objects.filter(owner=self.request.user)
 
+class BillingAddressViewSet(mixins.CreateModelMixin,
+        mixins.RetrieveModelMixin,
+        mixins.UpdateModelMixin,
+        mixins.ListModelMixin,
+        viewsets.GenericViewSet):
+    permission_classes = [permissions.IsAuthenticated]
+
+    def get_serializer_class(self):
+        if self.action == 'update':
+            return UpdateBillingAddressSerializer
+        else:
+            return BillingAddressSerializer
+
+    def get_queryset(self):
+        return self.request.user.billingaddress_set.all()
+
+    def create(self, request):
+        serializer = self.get_serializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+
+        # Validate VAT numbers.
+        country = serializer.validated_data["country"]
+        vat_number = serializer.validated_data["vat_number"]
+
+        # We ignore empty VAT numbers.
+        if vat_number != "":
+            if not validate_vat(country, vat_number):
+                return Response(
+                    {'error': 'Malformed VAT number.'},
+                    status=status.HTTP_400_BAD_REQUEST)
+            elif country in EU_COUNTRY_CODES:
+                # XXX: make a synchroneous call to a third patry API here might not be a good idea..
+                try:
+                    vies_state = vies.check_vat(country, vat_number)
+                    if not vies_state.valid:
+                        return Response(
+                                {'error': 'European VAT number does not exist in VIES.'},
+                                status=status.HTTP_400_BAD_REQUEST)
+                except Exception as e:
+                    logger.warning(e)
+                    return Response(
+                            {'error': 'Could not validate EU VAT number against VIES. Try again later..'},
+                            status=status.HTTP_500_INTERNAL_SERVER_ERROR)
+
+
+        serializer.save(owner=request.user)
+        return Response(serializer.data)
 
 ###
 # Old admin stuff.

uncloud_django_based/uncloud/uncloud_service/models.py

@@ -46,7 +46,8 @@ class GenericServiceProduct(Product):
             decimal_places=AMOUNT_DECIMALS,
             validators=[MinValueValidator(0)])
 
-    def recurring_price(self, recurring_period=RecurringPeriod.PER_MONTH):
+    @property
+    def recurring_price(self):
         # FIXME: handle recurring_period somehow.
         return self.custom_recurring_price
 

uncloud_django_based/uncloud/uncloud_service/serializers.py

@@ -2,27 +2,59 @@ from rest_framework import serializers
 from .models import *
 from uncloud_vm.serializers import ManagedVMProductSerializer
 from uncloud_vm.models import VMProduct
-from uncloud_pay.models import RecurringPeriod
+from uncloud_pay.models import RecurringPeriod, BillingAddress
+
+# XXX: the OrderSomethingSomthingProductSerializer classes add a lot of
+# boilerplate: can we reduce it somehow?
 
 class MatrixServiceProductSerializer(serializers.ModelSerializer):
     vm = ManagedVMProductSerializer()
 
-    # Custom field used at creation (= ordering) only.
+    class Meta:
+        model = MatrixServiceProduct
+        fields = ['uuid', 'order', 'owner', 'status', 'vm', 'domain',
+                'recurring_period']
+        read_only_fields = ['uuid', 'order', 'owner', 'status']
+
+class OrderMatrixServiceProductSerializer(MatrixServiceProductSerializer):
     recurring_period = serializers.ChoiceField(
             choices=MatrixServiceProduct.allowed_recurring_periods())
 
+    def __init__(self, *args, **kwargs):
+        super(OrderMatrixServiceProductSerializer, self).__init__(*args, **kwargs)
+        self.fields['billing_address'] = serializers.ChoiceField(
+                choices=BillingAddress.get_addresses_for(
+                    self.context['request'].user)
+                )
+
     class Meta:
-        model = MatrixServiceProduct
+        model = MatrixServiceProductSerializer.Meta.model
-        fields = ['uuid', 'order', 'owner', 'status', 'vm', 'domain', 'recurring_period']
+        fields = MatrixServiceProductSerializer.Meta.fields + [
-        read_only_fields = ['uuid', 'order', 'owner', 'status']
+                'recurring_period', 'billing_address'
+                ]
+        read_only_fields = MatrixServiceProductSerializer.Meta.read_only_fields
 
 class GenericServiceProductSerializer(serializers.ModelSerializer):
-    # Custom field used at creation (= ordering) only.
-    recurring_period = serializers.ChoiceField(
-            choices=GenericServiceProduct.allowed_recurring_periods())
-
     class Meta:
         model = GenericServiceProduct
         fields = ['uuid', 'order', 'owner', 'status', 'custom_recurring_price',
-                'custom_description', 'custom_one_time_price', 'recurring_period']
+                'custom_description', 'custom_one_time_price']
         read_only_fields = ['uuid', 'order', 'owner', 'status']
+
+class OrderGenericServiceProductSerializer(GenericServiceProductSerializer):
+    recurring_period = serializers.ChoiceField(
+            choices=GenericServiceProduct.allowed_recurring_periods())
+
+    def __init__(self, *args, **kwargs):
+        super(OrderGenericServiceProductSerializer, self).__init__(*args, **kwargs)
+        self.fields['billing_address'] = serializers.ChoiceField(
+                choices=BillingAddress.get_addresses_for(
+                    self.context['request'].user)
+                )
+
+    class Meta:
+        model = GenericServiceProductSerializer.Meta.model
+        fields = GenericServiceProductSerializer.Meta.fields + [
+                'recurring_period', 'billing_address'
+                ]
+        read_only_fields = GenericServiceProductSerializer.Meta.read_only_fields

uncloud_django_based/uncloud/uncloud_service/views.py

@@ -38,17 +38,25 @@ class MatrixServiceProductViewSet(ProductViewSet):
     def get_queryset(self):
         return MatrixServiceProduct.objects.filter(owner=self.request.user)
 
+    def get_serializer_class(self):
+        if self.action == 'create':
+            return OrderMatrixServiceProductSerializer
+        else:
+            return MatrixServiceProductSerializer
+
     @transaction.atomic
     def create(self, request):
         # Extract serializer data.
         serializer = self.get_serializer(data=request.data)
         serializer.is_valid(raise_exception=True)
         order_recurring_period = serializer.validated_data.pop("recurring_period")
+        order_billing_address = serializer.validated_data.pop("billing_address")
 
         # Create base order.)
         order = Order.objects.create(
                 recurring_period=order_recurring_period,
                 owner=request.user,
+                billing_address=order_billing_address,
                 starting_date=timezone.now()
                 )
         order.save()
@@ -72,22 +80,29 @@ class MatrixServiceProductViewSet(ProductViewSet):
 
 class GenericServiceProductViewSet(ProductViewSet):
     permission_classes = [permissions.IsAuthenticated]
-    serializer_class = GenericServiceProductSerializer
 
     def get_queryset(self):
         return GenericServiceProduct.objects.filter(owner=self.request.user)
 
+    def get_serializer_class(self):
+        if self.action == 'create':
+            return OrderGenericServiceProductSerializer
+        else:
+            return GenericServiceProductSerializer
+
     @transaction.atomic
     def create(self, request):
         # Extract serializer data.
         serializer = self.get_serializer(data=request.data)
         serializer.is_valid(raise_exception=True)
         order_recurring_period = serializer.validated_data.pop("recurring_period")
+        order_billing_address = serializer.validated_data.pop("billing_address")
 
         # Create base order.
         order = Order.objects.create(
                 recurring_period=order_recurring_period,
                 owner=request.user,
+                billing_address=order_billing_address,
                 starting_date=timezone.now()
                 )
         order.save()

uncloud_django_based/uncloud/ungleich_service/migrations/0005_auto_20200417_0551.py

@@ -1,18 +0,0 @@
-# Generated by Django 3.0.5 on 2020-04-17 05:51
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        ('ungleich_service', '0004_auto_20200403_1727'),
-    ]
-
-    operations = [
-        migrations.AlterField(
-            model_name='matrixserviceproduct',
-            name='status',
-            field=models.CharField(choices=[('PENDING', 'Pending'), ('AWAITING_PAYMENT', 'Awaiting payment'), ('BEING_CREATED', 'Being created'), ('SCHEDULED', 'Scheduled'), ('ACTIVE', 'Active'), ('MODIFYING', 'Modifying'), ('DELETED', 'Deleted'), ('DISABLED', 'Disabled'), ('UNUSABLE', 'Unusable')], default='AWAITING_PAYMENT', max_length=32),
-        ),
-    ]

uncloud_django_based/uncloud/ungleich_service/migrations/0006_genericserviceproduct.py

@@ -1,36 +0,0 @@
-# Generated by Django 3.0.5 on 2020-04-17 08:02
-
-from django.conf import settings
-import django.contrib.postgres.fields.jsonb
-import django.core.validators
-from django.db import migrations, models
-import django.db.models.deletion
-import uuid
-
-
-class Migration(migrations.Migration):
-
-    dependencies = [
-        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
-        ('uncloud_pay', '0005_auto_20200417_0551'),
-        ('ungleich_service', '0005_auto_20200417_0551'),
-    ]
-
-    operations = [
-        migrations.CreateModel(
-            name='GenericServiceProduct',
-            fields=[
-                ('extra_data', django.contrib.postgres.fields.jsonb.JSONField(blank=True, editable=False, null=True)),
-                ('uuid', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
-                ('status', models.CharField(choices=[('PENDING', 'Pending'), ('AWAITING_PAYMENT', 'Awaiting payment'), ('BEING_CREATED', 'Being created'), ('SCHEDULED', 'Scheduled'), ('ACTIVE', 'Active'), ('MODIFYING', 'Modifying'), ('DELETED', 'Deleted'), ('DISABLED', 'Disabled'), ('UNUSABLE', 'Unusable')], default='AWAITING_PAYMENT', max_length=32)),
-                ('custom_description', models.TextField()),
-                ('custom_recurring_price', models.DecimalField(decimal_places=2, default=0.0, max_digits=10, validators=[django.core.validators.MinValueValidator(0)])),
-                ('custom_one_time_price', models.DecimalField(decimal_places=2, default=0.0, max_digits=10, validators=[django.core.validators.MinValueValidator(0)])),
-                ('order', models.ForeignKey(editable=False, null=True, on_delete=django.db.models.deletion.CASCADE, to='uncloud_pay.Order')),
-                ('owner', models.ForeignKey(editable=False, on_delete=django.db.models.deletion.CASCADE, to=settings.AUTH_USER_MODEL)),
-            ],
-            options={
-                'abstract': False,
-            },
-        ),
-    ]