Refs #22804 -- Made an unsafe value of 'sep' in Signer an exception.

Per deprecation timeline.

django/core/signing.py

@@ -40,13 +40,11 @@ import datetime
 import json
 import re
 import time
-import warnings
 import zlib
 
 from django.conf import settings
 from django.utils import baseconv
 from django.utils.crypto import constant_time_compare, salted_hmac
-from django.utils.deprecation import RemovedInDjango110Warning
 from django.utils.encoding import force_bytes, force_str, force_text
 from django.utils.module_loading import import_string
 
@@ -158,8 +156,10 @@ class Signer(object):
         self.key = key or settings.SECRET_KEY
         self.sep = force_str(sep)
         if _SEP_UNSAFE.match(self.sep):
-            warnings.warn('Unsafe Signer separator: %r (cannot be empty or consist of only A-z0-9-_=)' % sep,
-                          RemovedInDjango110Warning)
+            raise ValueError(
+                'Unsafe Signer separator: %r (cannot be empty or consist of '
+                'only A-z0-9-_=)' % sep,
+            )
         self.salt = force_str(salt or
             '%s.%s' % (self.__class__.__module__, self.__class__.__name__))
 

tests/signing/tests.py

@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 
 import datetime
-import warnings
 
 from django.core import signing
 from django.test import SimpleTestCase
@@ -121,14 +120,11 @@ class TestSigner(SimpleTestCase):
 
     def test_invalid_sep(self):
         """should warn on invalid separator"""
+        msg = 'Unsafe Signer separator: %r (cannot be empty or consist of only A-z0-9-_=)'
         separators = ['', '-', 'abc']
         for sep in separators:
-            with warnings.catch_warnings(record=True) as recorded:
-                warnings.simplefilter('always')
+            with self.assertRaisesMessage(ValueError, msg % sep):
                 signing.Signer(sep=sep)
-                self.assertEqual(len(recorded), 1)
-                msg = str(recorded[0].message)
-                self.assertTrue(msg.startswith('Unsafe Signer separator'))
 
 
 class TestTimestampSigner(SimpleTestCase):