Fixed #26821 -- Fixed forms.Email/URLField crash on None value.

django/forms/fields.py

@@ -532,9 +532,8 @@ class EmailField(CharField):
     widget = EmailInput
     default_validators = [validators.validate_email]
 
-    def clean(self, value):
-        value = self.to_python(value).strip()
-        return super(EmailField, self).clean(value)
+    def __init__(self, *args, **kwargs):
+        super(EmailField, self).__init__(*args, strip=True, **kwargs)
 
 
 class FileField(Field):
@@ -665,6 +664,9 @@ class URLField(CharField):
     }
     default_validators = [validators.URLValidator()]
 
+    def __init__(self, *args, **kwargs):
+        super(URLField, self).__init__(*args, strip=True, **kwargs)
+
     def to_python(self, value):
 
         def split_url(url):
@@ -696,10 +698,6 @@ class URLField(CharField):
             value = urlunsplit(url_fields)
         return value
 
-    def clean(self, value):
-        value = self.to_python(value).strip()
-        return super(URLField, self).clean(value)
-
 
 class BooleanField(Field):
     widget = CheckboxInput

docs/releases/1.11.txt

@@ -334,6 +334,10 @@ Miscellaneous
   new :meth:`.AbstractUser.clean` method so that normalization is applied in
   cases like model form validation.
 
+* ``EmailField`` and ``URLField`` no longer accept the ``strip`` keyword
+  argument. Remove it because it doesn't have an effect in older versions of
+  Django as these fields alway strip whitespace.
+
 .. _deprecated-features-1.11:
 
 Features deprecated in 1.11

tests/forms_tests/field_tests/test_emailfield.py

@@ -51,3 +51,12 @@ class EmailFieldTest(FormFieldAssertionsMixin, SimpleTestCase):
         self.assertEqual('alf@foo.com', f.clean('alf@foo.com'))
         with self.assertRaisesMessage(ValidationError, "'Ensure this value has at most 15 characters (it has 20).'"):
             f.clean('alf123456788@foo.com')
+
+    def test_emailfield_strip_on_none_value(self):
+        f = EmailField(required=False, empty_value=None)
+        self.assertIsNone(f.clean(None))
+
+    def test_emailfield_unable_to_set_strip_kwarg(self):
+        msg = "__init__() got multiple values for keyword argument 'strip'"
+        with self.assertRaisesMessage(TypeError, msg):
+            EmailField(strip=False)

tests/forms_tests/field_tests/test_urlfield.py

@@ -151,3 +151,12 @@ class URLFieldTest(FormFieldAssertionsMixin, SimpleTestCase):
     def test_urlfield_normalization(self):
         f = URLField()
         self.assertEqual(f.clean('http://example.com/     '), 'http://example.com/')
+
+    def test_urlfield_strip_on_none_value(self):
+        f = URLField(required=False, empty_value=None)
+        self.assertIsNone(f.clean(None))
+
+    def test_urlfield_unable_to_set_strip_kwarg(self):
+        msg = "__init__() got multiple values for keyword argument 'strip'"
+        with self.assertRaisesMessage(TypeError, msg):
+            URLField(strip=False)