allowed phone numbers validator

django_project_base/notifications/base/phone_number_parser.py

@@ -1,11 +1,22 @@
 from typing import List
 
+from django.conf import settings
+from django.utils.module_loading import import_string
+
 
 class PhoneNumberParser:
+    @staticmethod
+    def is_allowed(phone_number: str) -> bool:
+        if (allowed_function := getattr(settings, "IS_PHONE_NUMBER_ALLOWED_FUNCTION", None)) and allowed_function:
+            return import_string(allowed_function)(phone_number)
+        return phone_number and len(phone_number) >= 8
+
     @staticmethod
     def valid_phone_numbers(candidates: List[str]) -> List[str]:
         valid: List[str] = []
         for number in candidates:
+            if not PhoneNumberParser.is_allowed(number):
+                continue
             if number.startswith("+"):
                 valid.append(number.lstrip("+"))
                 continue

django_project_base/notifications/tests/unit/test_is_phone_number_valid.py

@@ -0,0 +1,12 @@
+from django.test import TestCase
+
+from django_project_base.notifications.base.phone_number_parser import PhoneNumberParser
+
+
+class IsPhoneNumberValidTest(TestCase):
+    def test_is_phone_number_valid(self):
+        self.assertFalse(PhoneNumberParser.is_allowed("0903028"))
+        self.assertFalse(PhoneNumberParser.is_allowed("1919"))
+        self.assertTrue(PhoneNumberParser.is_allowed("03897234"))
+        self.assertTrue(PhoneNumberParser.is_allowed("0038631697001"))
+        self.assertTrue(PhoneNumberParser.is_allowed("+38676234567"))

django_project_base/settings.py

@@ -73,6 +73,7 @@
         "name": "DEFAULT_SMS_SENDER_ID_SETTING_NAME",
         "default": "",
     },
+    {"name": "IS_PHONE_NUMBER_ALLOWED_FUNCTION", "default": ""},
 )
 
 USER_CACHE_KEY = "django-user-{id}"