added ipv4 digit lengts validation (#191)

Co-authored-by: Norbert Chmiel <Norbert.Chmiel@pbkm.pl>

tests/test_ipv4.py

@@ -19,6 +19,7 @@ def test_returns_true_on_valid_ipv4_address(address):
     ('1278.0.0.1',),
     ('127.0.0.abc',),
     ('900.200.100.75',),
+    ('0127.0.0.1',),
 ])
 def test_returns_failed_validation_on_invalid_ipv4_address(address):
     assert isinstance(ipv4(address), ValidationFailure)

validators/ip_address.py

@@ -23,8 +23,12 @@ def ipv4(value):
 
     :param value: IP address string to validate
     """
-    groups = value.split('.')
-    if len(groups) != 4 or any(not x.isdigit() for x in groups):
+    groups = value.split(".")
+    if (
+        len(groups) != 4
+        or any(not x.isdigit() for x in groups)
+        or any(len(x) > 3 for x in groups)
+    ):
         return False
     return all(0 <= int(part) < 256 for part in groups)