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from django.utils import timezone
from datetime import timedelta
import requests
from postgresqleu.invoices.models import VatValidationCache
def validate_eu_vat_number(number):
if VatValidationCache.objects.filter(vatnumber=number, checkedat__gt=timezone.now() - timedelta(days=90)).exists():
return None
country = number[:2]
numberonly = number[2:]
try:
r = requests.get('https://ec.europa.eu/taxation_customs/vies/rest-api/ms/{}/vat/{}'.format(country, numberonly), timeout=15)
r.raise_for_status()
j = r.json()
if j.get('isValid', False):
VatValidationCache(vatnumber=number).save()
return None
return "Invalid VAT number according to validation service: {}".format(j.get('userError', ''))
except Exception as e:
return "Unable to reach validation service"
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