[Zope3-checkins] SVN: Zope3/branches/jack-e_interfacebased_workflow/src/zope/app/workflow/stateful/transition_event_subscribers.py Subscribers to transition events. The afterTransitionEventSubscriber is just an example of grants manipulation.

[Julien Anguenot]

Log message for revision 27991:
  Subscribers to transition events. The afterTransitionEventSubscriber is just an example of grants manipulation.


Changed:
  A   Zope3/branches/jack-e_interfacebased_workflow/src/zope/app/workflow/stateful/transition_event_subscribers.py


-=-
Added: Zope3/branches/jack-e_interfacebased_workflow/src/zope/app/workflow/stateful/transition_event_subscribers.py
===================================================================
--- Zope3/branches/jack-e_interfacebased_workflow/src/zope/app/workflow/stateful/transition_event_subscribers.py	2004-10-12 10:26:44 UTC (rev 27990)
+++ Zope3/branches/jack-e_interfacebased_workflow/src/zope/app/workflow/stateful/transition_event_subscribers.py	2004-10-12 10:28:01 UTC (rev 27991)
@@ -0,0 +1,125 @@
+##############################################################################
+#
+# Copyright (c) 2004 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+
+"""Transition event subscribers
+
+$Id: $
+"""
+
+from zope.app.securitypolicy.interfaces import IRolePermissionManager
+from zope.app.securitypolicy.interfaces import IPrincipalPermissionManager
+
+from zope.app.workflow.stateful.interfaces import IStatefulPIAdapter
+
+def transitionUserTriggeredSubscriber(event):
+    """Transition User Triggered Subscriber
+
+    Subscriber to event that occurs when the user submit through a
+    TransitionChangeFormView
+
+    This is the actual subscriber responsible to trigger the transition
+    """
+    process_instance_adapted = IStatefulPIAdapter(event.object)
+    if process_instance_adapted is not None:
+        try:
+            process_instance_adapted.fireTransition(event.form_action, event)
+        except KeyError:
+            raise str("Transition %s is not allowed" %(event.form_action))
+    else:
+        raise 'No adapter IStatefulPIAdapter found for on %s'%(str(event.object))
+    return 1
+
+def _getCreator(obj):
+    """Returns the creator of the object
+    """
+    # XXX use IAnotation instead
+    DCkey = "zope.app.dublincore.ZopeDublinCore"
+    annos = obj.__annotations__
+    return annos[DCkey]['Creator'][0]
+
+def afterTransitionEventSubscriber(event):
+    """After Transition Event Subscriber
+
+    Subscriber to the event that occurs after the transition has been fired.
+
+    It will be resposible for the grants.
+
+    This subscriber can be replaced by another one to change the policy.
+    """
+
+    # XXX this is specific to a given workflow. Let's see how to cope with that
+    # and fix it. Probably we need to put this mapping on the state itself
+
+    # Get event properties
+    transition = event.transition
+    transition_name = transition.__name__
+    context = event.context
+
+    # ipm
+    ipm = IRolePermissionManager(context)
+    ppm = IPrincipalPermissionManager(context)
+
+    # transition.getProcessDefinition()
+    # destination_state = pdefinition.getState(destination_state_name)
+
+    destination_state_name = transition.destinationState
+
+    if destination_state_name == "INITIAL":
+
+        #
+        # We don't do anything in here
+        # the mapping is the actual mapping at creation time
+        # It's then depending on the context
+        #
+
+        print "::afterTransitionEventSubscriber():: destination is private state"
+
+        creator = _getCreator(context)
+
+        if transition_name in ('reject', 'retract'):
+            ppm.grantPermissionToPrincipal('zope.ManageContent', creator)
+        elif transition_name == 'unpublish':
+            ppm.denyPermissionToPrincipal('zope.View', 'zope.anybody')
+            ppm.grantPermissionToPrincipal('zope.ManageContent', creator)
+
+    elif destination_state_name == "pending":
+
+        #
+        # Here, we remove the 'Manage Content' to the Owner
+        # add Mange Content and View to the 'Content Reviewer' Role
+        #
+
+        print "::afterTransitionEventSubscriber():: destination is pending state"
+
+        creator = _getCreator(context)
+        ppm.denyPermissionToPrincipal('zope.ManageContent', creator)
+
+    elif destination_state_name == "published":
+
+        #
+        # Here, we simply add the 'View' permission to the nobody principal
+        # since it's published
+        #
+
+        print "::afterTransitionEventSubscriber():: destination is published state"
+        ppm.grantPermissionToPrincipal('zope.View', 'zope.anybody')
+
+    else:
+        pass
+
+def transitionAddedEventSubscriber(event):
+    """Transition added event subscriber
+    """
+    obj = event.object
+    state_adapted = ITransitionActionAdapter(obj)