def change_skin(event):
# Skip when registry cannot be found
try:
registry = getUtility(IRegistry)
except ComponentLookupError:
return
# Skip global registry
if not isinstance(registry, LocalRegistry):
return
# Skip unset values
try:
settings = registry.forInterface(ILocalSkin)
except KeyError:
return
# Find context
context = getContextFromRequest(event.request)
# Skip context, which cannot change skin
if not hasattr(context, 'changeSkin'):
return
# Skip edit forms of objects with ILocalSkin-behavior
if ILocalSkin(context, None) is not None:
published = event.request.get('PUBLISHED', None)
form = getattr(published, 'form', None)
if IEditForm.implementedBy(form):
return
# Get the vocabulary to match against
vocabulary = getUtility(
IVocabularyFactory,
name='collective.behavior.localskin.vocabularies.skinnames'
)(context)
# Change valid skinname when possible
if settings.skinname in vocabulary:
context.changeSkin(settings.skinname)
