Fixed #17320 -- Added whitespace validation to the Site.domain field

django/contrib/sites/models.py

+import string
+
 from django.db import models
 from django.db.models.signals import pre_save, pre_delete
 from django.utils.translation import ugettext_lazy as _
 from django.utils.encoding import python_2_unicode_compatible
+from django.core.exceptions import ValidationError
 
 
 SITE_CACHE = {}
 
 
+def _simple_domain_name_validator(value):
+    """
+    Validates that the given value contains no whitespaces to prevent common
+    typos.
+    """
+    if not value:
+        return
+    checks = ((s in value) for s in string.whitespace)
+    if any(checks):
+        raise ValidationError(
+            _(u"The domain name cannot contain any spaces or tabs."))
+
+
 class SiteManager(models.Manager):
 
     def get_current(self):
@@ -37,7 +53,8 @@ class SiteManager(models.Manager):
 @python_2_unicode_compatible
 class Site(models.Model):
 
-    domain = models.CharField(_('domain name'), max_length=100)
+    domain = models.CharField(_('domain name'), max_length=100,
+        validators=[_simple_domain_name_validator])
     name = models.CharField(_('display name'), max_length=50)
     objects = SiteManager()
 

django/contrib/sites/tests.py

@@ -2,7 +2,7 @@ from __future__ import unicode_literals
 
 from django.conf import settings
 from django.contrib.sites.models import Site, RequestSite, get_current_site
-from django.core.exceptions import ObjectDoesNotExist
+from django.core.exceptions import ObjectDoesNotExist, ValidationError
 from django.http import HttpRequest
 from django.test import TestCase
 from django.test.utils import override_settings
@@ -71,3 +71,13 @@ class SitesFrameworkTests(TestCase):
         site = get_current_site(request)
         self.assertTrue(isinstance(site, RequestSite))
         self.assertEqual(site.name, "example.com")
+
+    def test_domain_name_with_whitespaces(self):
+        # Regression for #17320
+        # Domain names are not allowed contain whitespace characters
+        site = Site(name="test name", domain="test test")
+        self.assertRaises(ValidationError, site.full_clean)
+        site.domain = "test\ttest"
+        self.assertRaises(ValidationError, site.full_clean)
+        site.domain = "test\ntest"
+        self.assertRaises(ValidationError, site.full_clean)