[IMP] website_sale, website_portal: Re-use partner.check_vat method

Use check_vat function directly.
It already checks both format and centralize the dispatch of methods.

Closes #17644

addons/website_portal/controllers/main.py

@@ -6,6 +6,7 @@ from odoo.http import request
 from odoo import tools
 from odoo.tools import pycompat
 from odoo.tools.translate import _
+from odoo.exceptions import ValidationError
 
 from odoo.fields import Date
 
@@ -119,15 +120,16 @@ class website_account(http.Controller):
             error_message.append(_('Invalid Email! Please enter a valid email address.'))
 
         # vat validation
-        if data.get("vat") and hasattr(request.env["res.partner"], "check_vat"):
-            if request.website.company_id.sudo().vat_check_vies:
-                # force full VIES online check
-                check_func = request.env["res.partner"].vies_vat_check
-            else:
-                # quick and partial off-line checksum validation
-                check_func = request.env["res.partner"].simple_vat_check
-            vat_country, vat_number = request.env["res.partner"]._split_vat(data.get("vat"))
-            if not check_func(vat_country, vat_number):  # simple_vat_check
+        partner = request.env["res.partner"]
+        if data.get("vat") and hasattr(partner, "check_vat"):
+            partner_dummy = partner.new({
+                'vat': data['vat'],
+                'country_id': (int(data['country_id'])
+                               if data.get('country_id') else False),
+            })
+            try:
+                partner_dummy.check_vat()
+            except ValidationError:
                 error["vat"] = 'error'
 
         # error message for empty required fields

addons/website_sale/controllers/main.py

@@ -485,13 +485,15 @@ class WebsiteSale(http.Controller):
         # vat validation
         Partner = request.env['res.partner']
         if data.get("vat") and hasattr(Partner, "check_vat"):
-            check_func = request.website.company_id.vat_check_vies and Partner.vies_vat_check or Partner.simple_vat_check
-            vat_country, vat_number = Partner._split_vat(data.get("vat"))
-            if not check_func(vat_country, vat_number):
-                if country.code and check_func(country.code, data["vat"]):
-                    data["vat"] = country.code + data["vat"]
-                else:
-                    error["vat"] = 'error'
+            partner_dummy = Partner.new({
+                'vat': data['vat'],
+                'country_id': (int(data['country_id'])
+                               if data.get('country_id') else False),
+            })
+            try:
+                partner_dummy.check_vat()
+            except ValidationError:
+                error["vat"] = 'error'
 
         if [err for err in pycompat.items(error) if err == 'missing']:
             error_message.append(_('Some required fields are empty.'))