#! /usr/bin/env python
"""
Sample script that illustrates card connection decorators.

__author__ = "http://www.gemalto.com"

Copyright 2001-2012 gemalto
Author: Jean-Daniel Aussel, mailto:jean-daniel.aussel@gemalto.com

This file is part of pyscard.

pyscard is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

pyscard is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with pyscard; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
"""
from __future__ import print_function
from smartcard.CardType import AnyCardType
from smartcard.CardRequest import CardRequest
from smartcard.CardConnectionObserver import ConsoleCardConnectionObserver
from smartcard.CardConnection import CardConnection
from smartcard.CardConnectionDecorator import CardConnectionDecorator
from smartcard.util import toHexString

# define two custom CardConnectionDecorator
# the decorators are very simple, just to illustrate
# shortly how several decorators can be added to the
# card connection


class SecureChannelConnection(CardConnectionDecorator):
    '''This decorator is a mockup of secure channel connection.
    It merely pretends to cypher/uncypher upon apdu transmission.'''

    def __init__(self, cardconnection):
        CardConnectionDecorator.__init__(self, cardconnection)

    def cypher(self, bytes):
        '''Cypher mock-up; you would include the secure channel logics here.'''
        print('cyphering', toHexString(bytes))
        return bytes

    def uncypher(self, data):
        '''Uncypher mock-up;
        you would include the secure channel logics here.'''
        print('uncyphering', toHexString(data))
        return data

    def transmit(self, bytes, protocol=None):
        """Cypher/uncypher APDUs before transmission"""
        cypheredbytes = self.cypher(bytes)
        data, sw1, sw2 = CardConnectionDecorator.transmit(
            self, cypheredbytes, protocol)
        if [] != data:
            data = self.uncypher(data)
        return data, sw1, sw2


class FakeATRConnection(CardConnectionDecorator):
    '''This decorator changes the fist byte of the ATR. This is just an example
    to show that decorators can be nested.'''

    def __init__(self, cardconnection):
        CardConnectionDecorator.__init__(self, cardconnection)

    def getATR(self):
        """Replace first BYTE of ATR by 3F"""
        atr = CardConnectionDecorator.getATR(self)
        return [0x3f] + atr[1:]


# define the apdus used in this script
GET_RESPONSE = [0XA0, 0XC0, 00, 00]
SELECT = [0xA0, 0xA4, 0x00, 0x00, 0x02]
DF_TELECOM = [0x7F, 0x10]


# request any card type
cardtype = AnyCardType()
cardrequest = CardRequest(timeout=1.5, cardType=cardtype)
cardservice = cardrequest.waitforcard()

# attach the console tracer
observer = ConsoleCardConnectionObserver()
cardservice.connection.addObserver(observer)

# attach our decorator
cardservice.connection = FakeATRConnection(
    SecureChannelConnection(cardservice.connection))

# connect to the card and perform a few transmits
cardservice.connection.connect()

print('ATR', toHexString(cardservice.connection.getATR()))

apdu = SELECT + DF_TELECOM
response, sw1, sw2 = cardservice.connection.transmit(apdu)

if sw1 == 0x9F:
    apdu = GET_RESPONSE + [sw2]
    response, sw1, sw2 = cardservice.connection.transmit(apdu)


import sys
if 'win32' == sys.platform:
    print('press Enter to continue')
    sys.stdin.read(1)
