provide "delete own comments" as a configurable option

plone/app/discussion/browser/comments.py

@@ -318,12 +318,28 @@ class CommentsViewlet(ViewletBase):
                                                     aq_inner(self.context))
 
     def can_edit(self, reply):
-        """Returns true if current user has the 'Delete objects'
+        """Returns true if current user has the 'Edit comments'
         permission.
         """
         return getSecurityManager().checkPermission('Edit comments',
                                                     aq_inner(reply))
 
+    def can_delete(self, reply):
+        """By default requires 'Review comments'.
+        If 'delete own comments' is enabled, requires 'Edit comments'.
+        """
+        if self.is_delete_own_comment_allowed():
+            permission = 'Edit comments'
+        else:
+            permission = 'Review comments'
+        return getSecurityManager().checkPermission(permission,
+                                                    aq_inner(reply))
+
+    def is_delete_own_comment_allowed(self):
+        registry = queryUtility(IRegistry)
+        settings = registry.forInterface(IDiscussionSettings, check=False)
+        return settings.delete_own_comment_enabled
+
     def is_discussion_allowed(self):
         context = aq_inner(self.context)
         return context.restrictedTraverse('@@conversation_view').enabled()