"""
Smartcard Session.

__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.Exceptions import InvalidReaderException, NoReadersException
from smartcard.CardConnection import CardConnection
from smartcard.PassThruCardService import PassThruCardService
from smartcard.System import readers

class Session:
    """The Session object enables programmers to transmit APDU to smartcards.

    This is an example of use of the Session object:

    import smartcard
    reader=smartcard.listReaders()
    s = smartcard.Session(reader[0])
    SELECT = [0xA0, 0xA4, 0x00, 0x00, 0x02]
    DF_TELECOM = [0x7F, 0x10]
    data, sw1, sw2 = s.sendCommandAPDU(SELECT+DF_TELECOM)
    print data, sw1, sw2
    s.close()
    print `s`
    """

    def __init__(self, readerName=None, cardServiceClass=None):
        """Session constructor. Initializes a smart card session and connect to the card.

        readerName:         reader to connect to; default is first PCSC reader
        cardServiceClass:   card service to bind the session to; default is None
        """

        # if reader name not given, select first reader
        if readerName==None:
            if len( readers() ) > 0:
                self.reader=readers()[0]
                self.readerName=`self.reader`
            else:
                raise NoReadersException()

        # otherwise select reader from name
        else:
            self.readerName=readerName
            for reader in readers():
                if readerName==str(reader):
                    self.reader=reader
                    self.readerName=`self.reader`

        try:
            self.reader
        except AttributeError:
            raise InvalidReaderException( self.readerName )

        # open card connection and bind PassThruCardService
        cc = self.reader.createConnection()
        self.cs = PassThruCardService( cc )
        self.cs.connection.connect()


    def close(self):
        """Close the smartcard session.

        Closing a session will disconnect from the card."""
        self.cs.connection.disconnect()

    def sendCommandAPDU(self, command):
        """Send an APDU command to the connected smartcard.

        command:    list of APDU bytes, e.g. [0xA0, 0xA4, 0x00, 0x00, 0x02]

        returns a tuple (response, sw1, sw2 ) where
                response is the APDU response
                sw1, sw2 are the two status words
        """

        response, sw1, sw2 = self.cs.connection.transmit( command )

        if len(response)>2:
            response.append( sw1 )
            response.append( sw2 )
        return response, sw1, sw2

    def getATR(self):
        """Returns the ATR of the connected card."""
        return self.cs.connection.getATR()

    def __repr__(self):
        """Returns a string representation of the session."""
        return "<Session instance: readerName=%s>" % self.readerName


if __name__ == '__main__':
    """Small sample illustrating the use of Session.py."""
    pass

@@ -1100,16 +1100,17 @@
 eaders%0A%0A
+%0A
 class Se
@@ -1668,16 +1668,24 @@
 sion and
+%0A       
  connect
@@ -1846,24 +1846,52 @@
  to; default
+%0A                           
  is None%0A   
@@ -1977,18 +1977,20 @@
 aderName
+ 
 ==
+ 
 None:%0A  
@@ -2006,17 +2006,16 @@
  if len(
- 
 readers(
@@ -2015,17 +2015,16 @@
 eaders()
- 
 ) %3E 0:%0A 
@@ -2045,25 +2045,27 @@
  self.reader
-=
+ = 
 readers()%5B0%5D
@@ -2088,33 +2088,35 @@
  self.readerName
-=
+ = 
 %60self.reader%60%0A  
@@ -2260,17 +2260,19 @@
 aderName
-=
+ = 
 readerNa
@@ -2340,18 +2340,20 @@
 aderName
+ 
 ==
+ 
 str(read
@@ -2388,17 +2388,19 @@
 f.reader
-=
+ = 
 reader%0A 
@@ -2433,17 +2433,19 @@
 aderName
-=
+ = 
 %60self.re
@@ -2560,17 +2560,16 @@
 ception(
- 
 self.rea
@@ -2575,17 +2575,16 @@
 aderName
- 
 )%0A%0A     
@@ -2720,20 +2720,18 @@
 Service(
- 
 cc
- 
 )%0A      
@@ -2762,17 +2762,16 @@
 nect()%0A%0A
-%0A
     def 
@@ -3146,17 +3146,16 @@
 sw1, sw2
- 
 ) where%0A
@@ -3320,25 +3320,23 @@
 ransmit(
- 
 command
- 
 )%0A%0A     
@@ -3354,17 +3354,19 @@
 esponse)
-%3E
+ %3E 
 2:%0A     
@@ -3392,13 +3392,11 @@
 end(
- 
 sw1
- 
 )%0A  
@@ -3421,21 +3421,19 @@
 .append(
- 
 sw2
- 
 )%0A      

make pep8 happy