Django-VIES

Validate and store VAT Information Exchange System (VIES) data in Django.

Installation

python3 -m pip install django-vies

Usage

VATINField for models

from django.db import models
from vies.models import VATINField

class Company(models.Model):
    name = models.CharField(max_length=100)
    vat = VATINField(blank=True, null=True)

VATIN wrapper class, allows access to result.

>>> from vies.types import VATIN
>>> vat = VATIN('LU', '26375245')
>>> vat.is_valid()
True
>>> vat.data
{
    'countryCode': 'LU',
    'vatNumber': '26375245',
    'requestDate': datetime.date(2020, 4, 13),
    'valid': True,
    'name': 'AMAZON EUROPE CORE S.A R.L.',
    'address': '38, AVENUE JOHN F. KENNEDY\nL-1855  LUXEMBOURG'
}

You can also use the classmethod VATIN.from_str to create VATIN from str.

>>> from vies.types import VATIN
>>> vat = VATIN.from_str('LU26375245')
>>> vat.is_valid()
True

The VIES API endpoint can be very unreliable and seems to have an IP based access limit. Therefore the VATINField does NOT perform API based validation by default. It needs to be explicitly turned on or performed in a separate task.

e.g.

from vies.models import VATINField
from vies.validators import VATINValidator


class Company(models.Model):
    name = models.CharField(max_length=100)
    vat = VATINField(validators=[VATINValidator(verify=True, validate=True)])

validate=True will tell the validator to validate against the VIES API. verify is enabled on by default and will only verify that the VATIN matches the country's specifications.

It is recommended to perform VIES API validation inside an asynchronous task.

e.g. using celery

from celery import shared_task
from vies.models import VATINField
from vies.types import VATIN
from django.core.exceptions import ValidationError


class Company(models.Model):
    name = models.CharField(max_length=100)
    vat = VATINField()
    vat_is_valid = models.BooleanField(default=False)

    def __init__(self, *args, **kwargs):
        super(Company, self).__init__(*args, **kwargs)
        self.__vat = self.vat

    def save(self, *args, **kwargs):
        if self.__vat != self.vat:
            validate_vat_field.delay(self.pk)
        super(Company, self).save(*args, **kwargs)
        self.__vat = self.vat

    def refresh_from_db(self, *args, **kwargs)
        super(Company, self).refresh_from_db(*args, **kwargs)
        self.__vat = self.vat


@shared_task
def validate_vat_field(company_id):
    company = Company.objects.get(pk=company_id)
    vat = VATIN.from_str(company.vat)
    try:
        vat.validate()
    except ValidationError:
        company.vat_is_valid = False
    else:
        company.vat_is_valid = True
    finally:
        company.save(update_fields=['vat_is_valid'])

You can also use celery.current_app.send_task('validate_vat_field', kwargs={"company_id": self.pk}) to call asynchronous task to avoid circular import errors.

Translations

Feel free to contribute translations, it's simple!

cd vies
django-admin makemessages -l $YOUR_COUNTRY_CODE

Just edit the generated PO file. Pull-Requests are welcome!

License

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.