#! /usr/bin/env python3
"""
Sample for python PCSC wrapper module: send a Control Code to a card or
reader

__author__ = "Ludovic Rousseau"

Copyright 2009-2010 Ludovic Rousseau
Author: Ludovic Rousseau, mailto:ludovic.rousseau@free.fr

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 smartcard.scard import *
from smartcard.util import toASCIIBytes
from smartcard.pcsc.PCSCExceptions import *
import sys


def can_do_verify_pin(hCard):
    FEATURE_VERIFY_PIN_DIRECT = 6
    return parse_get_feature_request(hCard, FEATURE_VERIFY_PIN_DIRECT)


def can_do_modify_pin(hCard):
    FEATURE_MODIFY_PIN_DIRECT = 7
    return parse_get_feature_request(hCard, FEATURE_MODIFY_PIN_DIRECT)


def parse_get_feature_request(hCard, feature):
    # check the reader can do a verify pin
    CM_IOCTL_GET_FEATURE_REQUEST = SCARD_CTL_CODE(3400)
    hresult, response = SCardControl(hcard, CM_IOCTL_GET_FEATURE_REQUEST, [])
    if hresult != SCARD_S_SUCCESS:
        raise BaseSCardException(hresult)
    print(response)
    while len(response) > 0:
        tag = response[0]
        if feature == tag:
            return (((((response[2] << 8) +
                    response[3]) << 8) +
                    response[4]) << 8) + response[5]
        response = response[6:]


def verifypin(hCard, control=None):
    if control is None:
        control = can_do_verify_pin(hCard)
        if control is None:
            raise Exception("Not a pinpad")

    command = [0x00,  # bTimerOut
               0x00,  # bTimerOut2
               0x82,  # bmFormatString
               0x04,  # bmPINBlockString
               0x00,  # bmPINLengthFormat
               0x08, 0x04,  # wPINMaxExtraDigit
               0x02,  # bEntryValidationCondition
               0x01,  # bNumberMessage
               0x04, 0x09,  # wLangId
               0x00,  # bMsgIndex
               0x00, 0x00, 0x00,  # bTeoPrologue
               13, 0, 0, 0,  # ulDataLength
               0x00, 0x20, 0x00, 0x00, 0x08, 0x30, 0x30, 0x30, 0x30, 0x30,
               0x30, 0x30, 0x30]  # abData
    hresult, response = SCardControl(hcard, control, command)
    if hresult != SCARD_S_SUCCESS:
        raise BaseSCardException(hresult)
    return hresult, response

try:
    hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
    if hresult != SCARD_S_SUCCESS:
        raise EstablishContextException(hresult)
    print('Context established!')

    try:
        hresult, readers = SCardListReaders(hcontext, [])
        if hresult != SCARD_S_SUCCESS:
            raise ListReadersException(hresult)
        print('PCSC Readers:', readers)

        if len(readers) < 1:
            raise Exception("No smart card readers")

        for zreader in readers:

            print('Trying to Control reader:', zreader)

            try:
                hresult, hcard, dwActiveProtocol = SCardConnect(
                    hcontext, zreader, SCARD_SHARE_SHARED,
                    SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1)
                if hresult != SCARD_S_SUCCESS:
                    raise BaseSCardException(hresult)
                print('Connected with active protocol', dwActiveProtocol)

                try:
                    SELECT = [0x00, 0xA4, 0x04, 0x00, 0x06, 0xA0, 0x00,
                              0x00, 0x00, 0x18, 0xFF]
                    hresult, response = SCardTransmit(
                        hcard,
                        dwActiveProtocol,
                        SELECT)
                    if hresult != SCARD_S_SUCCESS:
                        raise BaseSCardException(hresult)

                    cmd_verify = can_do_verify_pin(hcard)
                    if (cmd_verify):
                        print("can do verify pin: 0x%08X" % cmd_verify)

                    cmd_modify = can_do_modify_pin(hcard)
                    if (cmd_modify):
                        print("can do modify pin: 0x%08X" % cmd_modify)

                    hresult, response = verifypin(hcard, cmd_verify)
                    print('Control:', response)
                except Exception as ex:
                    print("Exception:", ex)
                finally:
                    hresult = SCardDisconnect(hcard, SCARD_UNPOWER_CARD)
                    if hresult != SCARD_S_SUCCESS:
                        raise BaseSCardException(hresult)
                    print('Disconnected')

            except BaseSCardException as ex:
                print("SCard Exception:", ex)

    finally:
        hresult = SCardReleaseContext(hcontext)
        if hresult != SCARD_S_SUCCESS:
            raise ReleaseContextException(hresult)
        print('Released context.')

except error as e:
    print(e)

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