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"""CardConnectionDecorator that provides exclusive use of a card.
__author__ = "http://www.gemalto.com"
Copyright 2001-2010 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 smartcard.CardConnection import CardConnection
from smartcard.CardConnectionDecorator import CardConnectionDecorator
from smartcard.Exceptions import CardConnectionException
from smartcard.scard import SCardConnect, SCardDisconnect, SCARD_LEAVE_CARD, SCARD_SHARE_EXCLUSIVE
from smartcard.scard import SCardGetErrorMessage
from smartcard.pcsc import PCSCCardConnection
import smartcard.pcsc
class ExclusiveConnectCardConnection( CardConnectionDecorator ):
'''This decorator uses exclusive access to the card during connection to prevent other
processes to connect to this card.'''
def __init__( self, cardconnection ):
CardConnectionDecorator.__init__( self, cardconnection )
def connect( self, protocol=None, mode=None, disposition=None ):
'''Disconnect and reconnect in exclusive mode PCSCCardconnections.'''
CardConnectionDecorator.connect( self, protocol, mode, disposition )
component=self.component
while True:
if isinstance( component, smartcard.pcsc.PCSCCardConnection.PCSCCardConnection ):
pcscprotocol = PCSCCardConnection.translateprotocolmask( protocol )
if 0==pcscprotocol:
pcscprotocol = component.getProtocol()
if None!=component.hcard:
hresult = SCardDisconnect( component.hcard, SCARD_LEAVE_CARD )
if hresult!=0:
raise CardConnectionException( 'Failed to disconnect: ' + SCardGetErrorMessage(hresult) )
hresult, component.hcard, dwActiveProtocol = SCardConnect(
component.hcontext, str(component.reader), SCARD_SHARE_EXCLUSIVE, pcscprotocol )
if hresult!=0:
raise CardConnectionException( 'Failed to connect with SCARD_SHARE_EXCLUSIVE' + SCardGetErrorMessage(hresult) )
# print 'reconnected exclusive'
break
if hasattr( component, 'component' ):
component=component.component
else:
break
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