Implement exception module i18n support

The doc string in exception.py of Keystone will be
returned with __doc__ method, but cannot realize the
internationalization.Change exception module to enable
i18n support.

Changes in the patch are:
1, useing class variable msg_fmt to replace class __doc__
2, modify wsgi.render_exception function using unicode
function to replace str function
3, modify/add UT test cases

Fixes: bug # 1179425

Change-Id: I75c1229c905a2625d2f6961d1a8dd3958eac51a5

1 files changed, 20 insertions, 12 deletions

diff --git a/tests/test_exception.py b/tests/test_exception.py
index 33250835..d442d572 100644
--- a/tests/test_exception.py
+++ b/tests/test_exception.py
@@ -67,14 +67,14 @@ class ExceptionTestCase(test.TestCase):
         attribute = uuid.uuid4().hex
         e = exception.ValidationError(target=target, attribute=attribute)
         self.assertValidJsonRendering(e)
-        self.assertIn(target, str(e))
-        self.assertIn(attribute, str(e))
+        self.assertIn(target, unicode(e))
+        self.assertIn(attribute, unicode(e))
 
     def test_not_found(self):
         target = uuid.uuid4().hex
         e = exception.NotFound(target=target)
         self.assertValidJsonRendering(e)
-        self.assertIn(target, str(e))
+        self.assertIn(target, unicode(e))
 
     def test_403_title(self):
         e = exception.Forbidden()
@@ -101,7 +101,7 @@ class SecurityErrorTestCase(ExceptionTestCase):
         risky_info = uuid.uuid4().hex
         e = exception.Unauthorized(message=risky_info)
         self.assertValidJsonRendering(e)
-        self.assertNotIn(risky_info, str(e))
+        self.assertNotIn(risky_info, unicode(e))
 
     def test_unauthorized_exposure_in_debug(self):
         self.opt(debug=True)
@@ -109,7 +109,7 @@ class SecurityErrorTestCase(ExceptionTestCase):
         risky_info = uuid.uuid4().hex
         e = exception.Unauthorized(message=risky_info)
         self.assertValidJsonRendering(e)
-        self.assertIn(risky_info, str(e))
+        self.assertIn(risky_info, unicode(e))
 
     def test_forbidden_exposure(self):
         self.opt(debug=False)
@@ -117,7 +117,7 @@ class SecurityErrorTestCase(ExceptionTestCase):
         risky_info = uuid.uuid4().hex
         e = exception.Forbidden(message=risky_info)
         self.assertValidJsonRendering(e)
-        self.assertNotIn(risky_info, str(e))
+        self.assertNotIn(risky_info, unicode(e))
 
     def test_forbidden_exposure_in_debug(self):
         self.opt(debug=True)
@@ -125,7 +125,7 @@ class SecurityErrorTestCase(ExceptionTestCase):
         risky_info = uuid.uuid4().hex
         e = exception.Forbidden(message=risky_info)
         self.assertValidJsonRendering(e)
-        self.assertIn(risky_info, str(e))
+        self.assertIn(risky_info, unicode(e))
 
     def test_forbidden_action_exposure(self):
         self.opt(debug=False)
@@ -134,12 +134,12 @@ class SecurityErrorTestCase(ExceptionTestCase):
         action = uuid.uuid4().hex
         e = exception.ForbiddenAction(message=risky_info, action=action)
         self.assertValidJsonRendering(e)
-        self.assertNotIn(risky_info, str(e))
-        self.assertIn(action, str(e))
+        self.assertNotIn(risky_info, unicode(e))
+        self.assertIn(action, unicode(e))
 
         e = exception.ForbiddenAction(action=risky_info)
         self.assertValidJsonRendering(e)
-        self.assertIn(risky_info, str(e))
+        self.assertIn(risky_info, unicode(e))
 
     def test_forbidden_action_exposure_in_debug(self):
         self.opt(debug=True)
@@ -148,8 +148,16 @@ class SecurityErrorTestCase(ExceptionTestCase):
 
         e = exception.ForbiddenAction(message=risky_info)
         self.assertValidJsonRendering(e)
-        self.assertIn(risky_info, str(e))
+        self.assertIn(risky_info, unicode(e))
 
         e = exception.ForbiddenAction(action=risky_info)
         self.assertValidJsonRendering(e)
-        self.assertIn(risky_info, str(e))
+        self.assertIn(risky_info, unicode(e))
+
+    def test_unicode_argument_message(self):
+        self.opt(debug=False)
+
+        risky_info = u'\u7ee7\u7eed\u884c\u7f29\u8fdb\u6216'
+        e = exception.Forbidden(message=risky_info)
+        self.assertValidJsonRendering(e)
+        self.assertNotIn(risky_info, unicode(e))