Patch zope.interface to remove docstrings and avoid publishing.

From Products.PloneHotfix20161129.
Signed-off-by: Maurits van Rees <maurits@vanrees.org>

doc/CHANGES.rst

@@ -8,6 +8,9 @@ http://docs.zope.org/zope2/
 2.13.25 (unreleased)
 --------------------
 
+- Patch zope.interface to remove docstrings and avoid publishing.
+  From Products.PloneHotfix20161129.  [maurits]
+
 - Don't copy items the user is not allowed to view.
   From Products.PloneHotfix20161129.  [maurits]
 

src/Zope2/App/patches/__init__.py

+# Import all patches.
+import publishing
+
+# Have the patches been applied yet?
+_patched = False
+
+
+def apply_patches():
+    global _patched
+    if _patched:
+        return
+    _patched = True
+
+    publishing.apply_patches()

src/Zope2/App/patches/publishing.py

+# -*- coding: utf-8 -*-
+
+
+def delete_method_docstring(klass, method_name):
+    # Delete the docstring from the class method.
+    # Objects must have a docstring to be published.
+    # So this avoids them getting published.
+    method = getattr(klass, method_name, None)
+    if (method is not None and hasattr(method, 'im_func') and
+            hasattr(method.im_func, '__doc__')):
+        del method.im_func.__doc__
+
+
+element_methods = [
+    'getDoc',
+    'getName',
+    'getTaggedValue',
+    'getTaggedValueTags',
+    'queryTaggedValue',
+    'setTaggedValue',
+]
+interface_methods = [
+    'changed',
+    'dependents',
+    'direct',
+    'extends',
+    'get',
+    'getBases',
+    'getDescriptionFor',
+    'implementedBy',
+    'interfaces',
+    'isEqualOrExtendedBy',
+    'isOrExtends',
+    'names',
+    'namesAndDescriptions',
+    'providedBy',
+    'queryDescriptionFor',
+    'subscribe',
+    'unsubscribe',
+    'validateInvariants',
+    'weakref',
+]
+
+
+# Has this patch been applied yet?
+_patched = False
+
+
+def apply_patches():
+    global _patched
+    if _patched:
+        return
+    _patched = True
+
+    from zope.interface import Attribute
+    from zope.interface import Interface
+    from zope.interface.interface import Element
+    from zope.interface.interface import Method
+
+    for klass in [Element, Attribute, Interface, Method]:
+        try:
+            del klass.__doc__
+        except:
+            pass
+        for method_name in element_methods:
+            delete_method_docstring(klass, method_name)
+
+    for method_name in interface_methods:
+        delete_method_docstring(Interface, method_name)

src/Zope2/App/startup.py

@@ -60,6 +60,8 @@ def startup():
     from App.PersistentExtra import patchPersistent
     import Globals  # to set / fetch data
     patchPersistent()
+    from Zope2.App import patches
+    patches.apply_patches()
 
     global app
 

src/Zope2/App/tests/test_startup.py

@@ -63,6 +63,15 @@ class StartupTests(ZopeTestCase):
         startup()
         self.assertEqual(str(handler), logged)
 
+    def test_interface(self):
+        # We don't want Interface methods to be publishable.
+        # So they should not have a docstring.
+        # This is done in Zope2.App.patches.publishing.
+        from zope.interface import Interface
+        self.assertFalse(Interface.names.__doc__)
+        self.assertFalse(Interface.getTaggedValue.__doc__)
+        self.assertFalse(Interface.setTaggedValue.__doc__)
+
 
 def test_suite():
     suite = unittest.TestSuite()