#!/usr/bin/env python
import serial
import re, sys, signal, os, time, datetime
import RPi.GPIO as GPIO
 
BITRATE = 9600
GPIO.setmode(GPIO.BOARD)

CARDS = [
'060090840715',
'840034BD3E33',
]
def signal_handler(signal, frame):
	print "Cerrando"
	GPIO.output(7, GPIO.LOW) # Unlock the door on program exit
	GPIO.cleanup()
	ser.close()
	sys.exit(0)
 
if __name__ == '__main__':
	buffer = ''
	ser = serial.Serial('/dev/ttyAMA0', BITRATE, timeout=0)
	rfidPattern = re.compile(b'[\W_]+')
	signal.signal(signal.SIGINT, signal_handler)
	 
	while True:
		# Read data from RFID reader
		buffer = buffer + ser.readline()
		if '\n' in buffer:
		lines = buffer.split('\n')
		last_received = lines[-2]
		match = rfidPattern.sub('', last_received)
 
		if match:
			print match
			if match in CARDS:
				print 'card authorized'
			else:
				print 'unauthorized card'
		 
		# Clear buffer
		buffer = ''
		lines = ''
	 
	time.sleep(0.1)