Make ObjectManager's get and __getitem__ return only "items".

No longer return attributes / methods from the class or from acquisition.
Thanks to Richard Mitchell at Netsight for the report.

doc/CHANGES.rst

@@ -11,6 +11,10 @@ http://docs.zope.org/zope2/releases/.
 Bugs Fixed
 ++++++++++
 
+- Ensure that ObjectManager's ``get`` and ``__getitem__`` methods return only
+  "items" (no attributes / methods from the class or from acquisition).
+  Thanks to Richard Mitchell at Netsight for the report.
+
 - Removed HTML tags from exception text of ``Unauthorized`` exception
   because these tags get escaped since CVE-2010-1104 (see 2.13.12) got
   fixed.

src/OFS/ObjectManager.py

@@ -23,6 +23,7 @@
 import re
 import sys
 import time
+from types import NoneType
 
 from AccessControl import ClassSecurityInfo
 from AccessControl.class_init import InitializeClass
@@ -757,12 +758,13 @@ def __delitem__(self, name):
         return self.manage_delObjects(ids=[name])
 
     def __getitem__(self, key):
-        v=self._getOb(key, None)
-        if v is not None: return v
-        if hasattr(self, 'REQUEST'):
-            request=self.REQUEST
+        if key in self:
+            return self._getOb(key, None)
+        request = getattr(self, 'REQUEST', None)
+        if not isinstance(request, (str, NoneType)):
             method=request.get('REQUEST_METHOD', 'GET')
-            if request.maybe_webdav_client and not method in ('GET', 'POST'):
+            if (request.maybe_webdav_client and
+                method not in ('GET', 'POST')):
                 return NullResource(self, key, request).__of__(self)
         raise KeyError, key
 
@@ -783,7 +785,9 @@ def __nonzero__(self):
 
     security.declareProtected(access_contents_information, 'get')
     def get(self, key, default=None):
-        return self._getOb(key, default)
+        if key in self:
+            return self._getOb(key, default)
+        return default
 
     security.declareProtected(access_contents_information, 'keys')
     def keys(self):

src/OFS/tests/testApplication.py

@@ -57,6 +57,7 @@ def test___bobo_traverse__attribute_hit(self):
     def test___bobo_traverse__attribute_miss_key_hit(self):
         app = self._makeOne()
         app._getOb = lambda x, y: x
+        app._objects = [{'id': 'OTHER', 'meta_type': None}]
         request = {}
         self.assertEqual(app.__bobo_traverse__(request, 'OTHER'), 'OTHER')
 

src/OFS/tests/testObjectManager.py

@@ -412,6 +412,22 @@ def test_nonzero(self):
         om = self._makeOne()
         self.assertTrue(om)
 
+    def test___getitem___miss(self):
+        om = self._makeOne()
+        self.assertRaises(KeyError, om.__getitem__, 'nonesuch')
+
+    def test___getitem___miss_w_non_instance_attr(self):
+        om = self._makeOne()
+        self.assertRaises(KeyError, om.__getitem__, 'get')
+
+    def test___getitem___hit(self):
+        om = self._makeOne()
+        si1 = SimpleItem('1')
+        om['1'] = si1
+        got = om['1']
+        self.assertTrue(got.aq_self is si1)
+        self.assertTrue(got.aq_parent is om)
+
     def test_get_miss_wo_default(self):
         om = self._makeOne()
         self.assertEqual(om.get('nonesuch'), None)
@@ -421,6 +437,10 @@ def test_get_miss_w_default(self):
         obj = object()
         self.assertTrue(om.get('nonesuch', obj) is obj)
 
+    def test_get_miss_w_non_instance_attr(self):
+        om = self._makeOne()
+        self.assertEqual(om.get('get'), None)
+
     def test_get_hit(self):
         om = self._makeOne()
         si1 = SimpleItem('1')