+# Copyright (c) 2010 August Lilleaas
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+module SessionPersistence
+ private
+
+ # Install filter when we are included
+ def self.included(controller)
+ controller.after_filter :persist_session
+ end
+
+ # Override this method if you don't want to use session[:_remember_for].
+ def session_persistence_key
+ :_remember_for
+ end
+
+ # Persist the session.
+ #
+ # session_expires_after 1.hour
+ # session_expires_after 2.weeks
+ def session_expires_after(seconds)
+ session[session_persistence_key] = seconds
+ end
+
+ # Expire the session.
+ def session_expires_automatically
+ session.delete(session_persistence_key)
+ request.session_options[:renew] = true
+ end
+
+ # Filter callback
+ def persist_session
+ if session[session_persistence_key]
+ request.session_options[:expire_after] = session[session_persistence_key]
+ end
+ end
+end