Add support for IDN validation, refs #14

CHANGES.rst

@@ -2,6 +2,12 @@ Changelog
 ---------
 
 
+0.10.0 (2016-01-09)
+^^^^^^^^^^^^^^^^^^^
+
+- Added support for internationalized domain names in ``domain`` validator
+
+
 0.9.0 (2015-10-10)
 ^^^^^^^^^^^^^^^^^^
 

tests/test_domain.py

@@ -4,19 +4,23 @@
 from validators import domain, ValidationFailure
 
 
-@pytest.mark.parametrize(('value',), [
-    ('example.com',),
+@pytest.mark.parametrize('value', [
+    'example.com',
+    'xn----gtbspbbmkef.xn--p1ai',
+    'underscore_subdomain.example.com',
+    'something.versicherung'
 ])
 def test_returns_true_on_valid_domain(value):
     assert domain(value)
 
 
-@pytest.mark.parametrize(('value',), [
-    ('example.com/',),
-    ('example.com:4444',),
-    ('example.-com',),
-    ('example.',),
-    ('example',),
+@pytest.mark.parametrize('value', [
+    'example.com/',
+    'example.com:4444',
+    'example.-com',
+    'example.',
+    '-example.com',
+    'example',
 ])
 def test_returns_failed_validation_on_invalid_domain(value):
     assert isinstance(domain(value), ValidationFailure)

validators/__init__.py

@@ -13,4 +13,4 @@
 from .utils import ValidationFailure, validator  # noqa
 from .uuid import uuid  # noqa
 
-__version__ = '0.9'
+__version__ = '0.10'

validators/domain.py

@@ -3,8 +3,10 @@
 from .utils import validator
 
 pattern = re.compile(
-    r'^(?!\-)(?:[a-zA-Z\d\-]{0,62}[a-zA-Z\d]\.)'
-    r'{1,126}(?!\d+)[a-zA-Z\d]{1,63}$'
+    r'^(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|'
+    r'([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|'
+    r'([a-zA-Z0-9][-_.a-zA-Z0-9]{1,61}[a-zA-Z0-9]))\.'
+    r'([a-zA-Z]{2,13}|[a-zA-Z0-9-]{2,30}.[a-zA-Z]{2,3})$'
 )
 
 
@@ -24,6 +26,18 @@ def domain(value):
         >>> domain('example.com/')
         ValidationFailure(func=domain, ...)
 
+
+    Supports IDN domains as well::
+
+        >>> domain('xn----gtbspbbmkef.xn--p1ai')
+        True
+
+    .. versionadded:: 0.9
+
+    .. versionchanged:: 0.10
+
+        Added support for internationalized domain name (IDN) validation.
+
     :param value: domain string to validate
     """
     return pattern.match(value)