Added support for bytes in sessions back

CHANGES

@@ -12,6 +12,9 @@ Pending bugfix release.
   made the filter not work properly in HTML attributes.  Now it's
   possible to use that filter in single quoted attributes.  This should
   make using that filter with angular.js easier.
+- Added support for byte strings back to the session system.  This broke
+  compatibility with the common case of people putting binary data for
+  token verification into the session.
 
 Version 0.10
 ------------

flask/sessions.py

@@ -11,6 +11,7 @@
 
 import uuid
 import hashlib
+from base64 import b64encode, b64decode
 from datetime import datetime
 from werkzeug.http import http_date, parse_date
 from werkzeug.datastructures import CallbackDict
@@ -62,6 +63,8 @@ class TaggedJSONSerializer(object):
                 return {' t': [_tag(x) for x in value]}
             elif isinstance(value, uuid.UUID):
                 return {' u': value.hex}
+            elif isinstance(value, bytes):
+                return {' b': b64encode(value).decode('ascii')}
             elif callable(getattr(value, '__html__', None)):
                 return {' m': text_type(value.__html__())}
             elif isinstance(value, list):
@@ -90,6 +93,8 @@ class TaggedJSONSerializer(object):
                 return tuple(the_value)
             elif the_key == ' u':
                 return uuid.UUID(the_value)
+            elif the_key == ' b':
+                return b64decode(the_value)
             elif the_key == ' m':
                 return Markup(the_value)
             elif the_key == ' d':

flask/testsuite/basic.py

@@ -326,6 +326,7 @@ class BasicFunctionalityTestCase(FlaskTestCase):
             flask.session['m'] = flask.Markup('Hello!')
             flask.session['u'] = the_uuid
             flask.session['dt'] = now
+            flask.session['b'] = b'\xff'
             flask.session['t'] = (1, 2, 3)
             return response
 
@@ -340,6 +341,8 @@ class BasicFunctionalityTestCase(FlaskTestCase):
         self.assert_equal(type(rv['m']), flask.Markup)
         self.assert_equal(rv['dt'], now)
         self.assert_equal(rv['u'], the_uuid)
+        self.assert_equal(rv['b'], b'\xff')
+        self.assert_equal(type(rv['b']), bytes)
         self.assert_equal(rv['t'], (1, 2, 3))
 
     def test_flashes(self):