Yubikey presence detection and logout

logout-detection.app

(*

Based on: http://macscripter.net/viewtopic.php?pid=149887#p149887 

1. Replace <your_id_vendor_here> and <your_id_product_here> with the respective id's.
2. When saving the file on Script Editor as AppleScript application, check the option 'Stay open'.
3. Add the application to your login items.
4. Logout & login.

Note: This logic works better when Challenge-Response is used for login, since the key
      needs already to be inserted.

*)

property status : false
property idVendor : <your_id_vendor_here>
property idProduct : <your_id_product_here>

on YubiKeyIsConnected()
	set grepItems to "\"idVendor\" = " & idVendor & "\\|" & "\"idProduct\" = " & idProduct
	try
		set theResult to paragraphs of (do shell script "ioreg -c IOUSBDevice | grep " & quoted form of grepItems)
		return (count theResult) = 2
	on error
		return false
	end try
end YubiKeyIsConnected

on idle
	set currentState to YubiKeyIsConnected()
	if currentState is true and status is false then
		set status to true
	else if currentState is false and status is true then
		set status to false
		activate application "ScreenSaverEngine"
	end if
	return 1
end idle