From da44dad3256b29d6ed4a83c170179ac82299cf64 Mon Sep 17 00:00:00 2001
From: Nicolas Selva <nicolas.selva@imio.be>
Date: Fri, 29 Jul 2022 12:03:59 +0200
Subject: [PATCH] [TELE-1398]add is_valid_iban

---
 .../templatetags/imio_teleservices.py         | 40 ++++++++++++++++++-
 1 file changed, 39 insertions(+), 1 deletion(-)

diff --git a/imio_teleservices_templatetags/templatetags/imio_teleservices.py b/imio_teleservices_templatetags/templatetags/imio_teleservices.py
index 23b3b9b..2f330ca 100644
--- a/imio_teleservices_templatetags/templatetags/imio_teleservices.py
+++ b/imio_teleservices_templatetags/templatetags/imio_teleservices.py
@@ -11,6 +11,11 @@ from wcs.qommon.templatetags.qommon import unlazy
 register = template.Library()
 
 
+@register.filter
+def clean_string(value):
+    return value.replace(" ", "").replace(".", "").replace("-", "")
+
+
 @register.filter
 def check_class(value):
     return str(type(value))
@@ -66,7 +71,7 @@ def is_valid_tva_number(tva_number, formatage=True):
     """
     # si formatage alors enlève les espaces, points et tirets
     if formatage:
-        tva_number = tva_number.replace(" ", "").replace(".", "").replace("-", "")
+        tva_number = clean_string(tva_number)
 
     if not tva_number[:2].upper() == "BE":
         return False
@@ -84,6 +89,39 @@ def is_valid_tva_number(tva_number, formatage=True):
             return False
 
 
+@register.filter
+def is_valid_iban(iban, formatage=True):
+    """
+    iban : (str) iban
+    formatage : (bool) True/False
+    return : (bool) True si le numéro est valide
+    """
+    iban_validation_modulo = 97
+    iban = iban.upper()
+    if formatage:
+        iban = clean_string(iban)
+    if len(iban) < 5:
+        return False
+    modified_iban = iban[4: len(iban)] + iban[0:4]
+    numeric_iban_string = ""
+    for c in modified_iban:
+        current_char_code = ord(c)
+        # Integer
+        if (current_char_code > 47) and (current_char_code < 58):
+            numeric_iban_string = numeric_iban_string + c
+        # Char
+        elif (current_char_code > 64) and (current_char_code < 91):
+            value = current_char_code - 65 + 10
+            numeric_iban_string = numeric_iban_string + str(value)
+        else:
+            return False
+    previous_modulo = 0
+    for i in range(0, len(numeric_iban_string), 5):
+        subpart = str(previous_modulo) + "" + numeric_iban_string[i: i + 5]
+        previous_modulo = int(subpart) % iban_validation_modulo
+    return previous_modulo == 1
+
+
 @register.filter
 def liste_type_rdv_plusieurs_personnes(value):
     """