Use zope.interface decorator

This not only makes code more pleasent to read,
but also makes the code python 3 compatible
(while maintaining python 2 compatibility).

CHANGES.rst

@@ -13,7 +13,8 @@ New:
 
 Fixes:
 
-- *add item here*
+- Use zope.interface decorator.
+  [gforcada]
 
 
 3.0.18 (2016-02-25)

plone/protect/authenticator.py

@@ -4,7 +4,7 @@
 from Products.Five import BrowserView
 from zExceptions import Forbidden
 from zope.component import getUtility
-from zope.interface import implements
+from zope.interface import implementer
 from ZPublisher.HTTPRequest import HTTPRequest
 
 import hmac
@@ -93,8 +93,8 @@ def createToken(extra='', manager=None):
     return hmac.new(secret, user + extra, sha).hexdigest()
 
 
+@implementer(IAuthenticatorView)
 class AuthenticatorView(BrowserView):
-    implements(IAuthenticatorView)
 
     def token(self, extra=''):
         return createToken(extra)

plone/protect/auto.py

@@ -30,7 +30,7 @@
 from zope.component import ComponentLookupError
 from zope.component import adapts
 from zope.component import getUtility
-from zope.interface import implements, Interface
+from zope.interface import implementer, Interface
 from zope.globalrequest import getRequest
 
 try:
@@ -46,14 +46,13 @@
     ('true', 't', 'yes', 'y', '1')
 
 
+@implementer(ITransform)
 class ProtectTransform(object):
     """
     XXX Need to be extremely careful with everything we do in here
     since an error here would mean the transform is skipped
     and no CSRF protection...
     """
-
-    implements(ITransform)
     adapts(Interface, Interface)  # any context, any request
 
     # should be last lxml related transform

plone/protect/views.py

@@ -1,7 +1,8 @@
 from plone.protect.interfaces import IConfirmView
 from Products.Five import BrowserView
-from zope.interface import implements
+from zope.interface import implementer
 
 
+@implementer(IConfirmView)
 class ConfirmView(BrowserView):
-    implements(IConfirmView)
+    pass