Validate and store VAT Information Exchange System (VIES) data in Django.
python3 -m pip install django-viesVATINField 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()
TrueThe 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.
Feel free to contribute translations, it's simple!
cd vies
django-admin makemessages -l $YOUR_COUNTRY_CODEJust edit the generated PO file. Pull-Requests are welcome!
The MIT License (MIT)
Copyright (c) 2014-2016 Johannes Hoppe
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