[1.7.x] Fixed #23593 -- Fixed crash in AdminEmailHandler with non-ASCII characters in request.

Thanks edevil for the report and Simon Charette for review.

Backport of 9dff5ce7c7 from master

django/utils/log.py

@@ -1,3 +1,5 @@
+from __future__ import unicode_literals
+
 import logging
 import sys
 import warnings
@@ -6,6 +8,7 @@ from django.conf import settings
 from django.core import mail
 from django.core.mail import get_connection
 from django.utils.deprecation import RemovedInNextVersionWarning
+from django.utils.encoding import force_text
 from django.utils.module_loading import import_string
 from django.views.debug import ExceptionReporter, get_exception_reporter_filter
 
@@ -106,7 +109,7 @@ class AdminEmailHandler(logging.Handler):
                 record.getMessage()
             )
             filter = get_exception_reporter_filter(request)
-            request_repr = '\n{0}'.format(filter.get_request_repr(request))
+            request_repr = '\n{0}'.format(force_text(filter.get_request_repr(request)))
         except Exception:
             subject = '%s: %s' % (
                 record.levelname,

docs/releases/1.7.1.txt

@@ -97,3 +97,6 @@ Bugfixes
   possible to import arbitrary packages from the Python path. This was not
   considered a security issue because ``admindocs`` is only accessible to staff
   users (:ticket:`23601`).
+
+* Fixed ``UnicodeDecodeError`` crash in ``AdminEmailHandler`` with non-ASCII
+  characters in the request (:ticket:`23593`).

tests/logging_tests/tests.py

@@ -1,3 +1,4 @@
+# -*- coding:utf-8 -*-
 from __future__ import unicode_literals
 
 import logging
@@ -319,6 +320,26 @@ class AdminEmailHandlerTest(TestCase):
             mail.mail_admins = orig_mail_admins
             admin_email_handler.email_backend = orig_email_backend
 
+    @override_settings(
+        ADMINS=(('whatever admin', 'admin@example.com'),),
+    )
+    def test_emit_non_ascii(self):
+        """
+        #23593 - AdminEmailHandler should allow Unicode characters in the
+        request.
+        """
+        handler = self.get_admin_email_handler(self.logger)
+        record = self.logger.makeRecord('name', logging.ERROR, 'function', 'lno', 'message', None, None)
+        rf = RequestFactory()
+        url_path = '/º'
+        record.request = rf.get(url_path)
+        handler.emit(record)
+        self.assertEqual(len(mail.outbox), 1)
+        msg = mail.outbox[0]
+        self.assertEqual(msg.to, ['admin@example.com'])
+        self.assertEqual(msg.subject, "[Django] ERROR (EXTERNAL IP): message")
+        self.assertIn("path:%s" % url_path, msg.body)
+
 
 class SettingsConfigTest(AdminScriptTestCase):
     """