Class: Smartcard::Iso::PcscTransport

Inherits:
Object
  • Object
show all
Includes:
IsoCardMixin
Defined in:
lib/smartcard/iso/pcsc_transport.rb

Overview

Implements the transport layer for a smartcard connected to a PC/SC reader.

Constant Summary collapse

PCSC = 
Smartcard::PCSC

Instance Method Summary collapse

Methods included from IsoCardMixin

deserialize_response, #iso_apdu, #iso_apdu!, serialize_apdu

Constructor Details

#initialize(options) ⇒ PcscTransport

Returns a new instance of PcscTransport.



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# File 'lib/smartcard/iso/pcsc_transport.rb', line 18

def initialize(options)
  @options = options
  @context = nil
  @card = nil    
  @atr = nil
end

Instance Method Details

#card_atr ⇒ Object 



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# File 'lib/smartcard/iso/pcsc_transport.rb', line 31

def card_atr
  @atr
end

#connect ⇒ Object 



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# File 'lib/smartcard/iso/pcsc_transport.rb', line 35

def connect
  @context = PCSC::Context.new if @context.nil?
  
  if @options[:reader_name]
    @reader_name = @options[:reader_name]
  else
    # Get the first reader.
    readers = @context.readers
    @reader_name = readers[@options[:reader_index] || 0]
  end
  
  # Query the reader's status.
  queries = PCSC::ReaderStateQueries.new 1
  queries[0].reader_name = @reader_name
  queries[0].current_state = :unknown
  @context.wait_for_status_change queries, 100
  queries.ack_changes
  
  # Prompt for card insertion unless that already happened.
  unless queries[0].current_state.include? :present
    puts "Please insert smart-card card in reader #{@reader_name}\n"
    until queries[0].current_state.include? :presentt do
      @context.wait_for_status_change queries
      queries.ack_changes
    end
    puts "Card detected\n"
  end
  
  # Connect to the card.
  @card = @context.card @reader_name, :shared 
  @atr = @card.info[:atr]
end

#disconnect ⇒ Object 



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# File 'lib/smartcard/iso/pcsc_transport.rb', line 68

def disconnect
  unless @card.nil?
    @card.disconnect
    @card = nil
    @atr = nil
  end
  unless @context.nil?
    @context.release
    @context = nil
  end
end

#exchange_apdu(apdu) ⇒ Object 



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# File 'lib/smartcard/iso/pcsc_transport.rb', line 25

def exchange_apdu(apdu)
  xmit_apdu_string = apdu.pack('C*')
  result_string = @card.transmit xmit_apdu_string
  return result_string.unpack('C*')
end

#to_s ⇒ Object 



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# File 'lib/smartcard/iso/pcsc_transport.rb', line 80

def to_s
  "#<PC/SC Terminal: disconnected>" if @card.nil?
  "#<PC/SC Terminal: #{@reader_name}>"
end