#!/usr/bin/env python
 # MSR90 Magnetic Stripe Reader - Developed by acidvegas in Python (https://git.acid.vegas/msr90)
 
 '''
 Notes:
 	- Currently only supports reading VISA cards, will add support for Mastercard, License, Gift Cards, etc.
 '''
 
 import getpass
 import re
 
 
 # Define ANSI color codes
 YELLOW = '\033[93m'
 CYAN   = '\033[96m'
 GRAY   = '\033[90m'
 RESET  = '\033[0m'
 
 
 def format_pan(pan: str) -> str:
 	'''
 	Format the Primary Account Number (PAN) by grouping the digits in sets of 4
 
 	:param pan: The Primary Account Number (PAN) to format
 	'''
 
 	return ' '.join(pan[i:i+4] for i in range(0, len(pan), 4))
 
 
 def format_exp_date(exp_date: str) -> str:
 	'''
 	Format the expiration date to be MM/YY
 
 	:param exp_date: The expiration date to format
 	'''
 
 	return exp_date[2:4] + '/' + exp_date[0:2]
 
 
 def service_code_descriptions(digit: int, code: str) -> str:
 	'''
 	Get the description for the service code digit
 
 	:param digit: The digit number (1, 2, or 3)
 	:param code: The code value for the digit
 	'''
 
 	descriptions = {
 		'1': {
 			'1': 'International interchange OK',
 			'2': 'International interchange, use IC (chip) where feasible',
 			'5': 'National interchange only except under bilateral agreement',
 			'6': 'National interchange only, use IC (chip) where feasible',
 			'7': 'No interchange except under bilateral agreement (closed loop)',
 			'9': 'Test'
 		},
 		'2': {
 			'0': 'Normal',
 			'2': 'Contact issuer via online means',
 			'4': 'Contact issuer via online means except under bilateral agreement'
 		},
 		'3': {
 			'0': 'No restrictions, PIN required',
 			'1': 'No restrictions',
 			'2': 'Goods and services only (no cash)',
 			'3': 'ATM only, PIN required',
 			'4': 'Cash only',
 			'5': 'Goods and services only (no cash), PIN required',
 			'6': 'No restrictions, use PIN where feasible',
 			'7': 'Goods and services only (no cash), use PIN where feasible'
 		}
 	}
 
 	return descriptions[str(digit)].get(code, 'Unknown')
 
 
 def parse_magnetic_stripe(data: str):
 	'''
 	Parse the magnetic stripe data and print the results
 
 	:param data: The raw magnetic stripe data to parse
 	'''
 
 	# https://en.wikipedia.org/wiki/ISO/IEC_7813#Programming
 	# ^%B([0-9]{1,19})\^([^\^]{2,26})\^([0-9]{4}|\^)([0-9]{3}|\^)([^\?]*)\?$
 	# ^\;([0-9]{1,19})\=([0-9]{4}|\=)([0-9]{3}|\=)([^\?]*)\?$ 
 
 	track1_match = re.search(r'^%([AB])(\d{1,19})\^([^\^]{2,26})\^(\d{4})(\d{3})([^\?]*?)\?(\w?)', data)
 	track2_match = re.search(r';(\d{1,19})=(\d{4})(\d{3})(.*?)\?$', data)
 	track3_match = re.search(r'(\+[^\?]+\?)', data)
 
 	if track1_match:
 		format_code, pan, name, exp_date, service_code, discretionary_data, lrc = track1_match.groups()
 		if format_code == 'A':
 			raise ValueError('Track 1 data is using format code A which is not supported')
 		formatted_pan = format_pan(pan)
 		formatted_exp_date = format_exp_date(exp_date)
 		desc1 = service_code_descriptions(1, service_code[0])
 		desc2 = service_code_descriptions(2, service_code[1])
 		desc3 = service_code_descriptions(3, service_code[2])
 		print('Track 1 Data:')
 		print(f'{YELLOW}Format Code                  {GRAY}|{RESET} {format_code} - Financial cards (ISO/IEC 7813)')
 		print(f'{YELLOW}Primary Account Number (PAN) {GRAY}|{RESET} {formatted_pan}')
 		print(f'{YELLOW}Cardholder Name              {GRAY}|{RESET} {name}')
 		print(f'{YELLOW}Expiration Date              {GRAY}|{RESET} {formatted_exp_date}')
 		print(f'{YELLOW}Service Code Digit 1         {GRAY}|{RESET} {service_code[0]}: {desc1}')
 		print(f'{YELLOW}Service Code Digit 2         {GRAY}|{RESET} {service_code[1]}: {desc2}')
 		print(f'{YELLOW}Service Code Digit 3         {GRAY}|{RESET} {service_code[2]}: {desc3}')
 		print(f'{YELLOW}Discretionary Data           {GRAY}|{RESET} {discretionary_data}')
 		print(f'{YELLOW}LRC (optional)               {GRAY}|{RESET} {lrc}')
 		print(f'{YELLOW}Raw Track Data               {GRAY}|{RESET} {track1_match.group(0)}')
 	else:
 		generic_track1 = re.search(r'(%[^?]+\?)', data)
 		if generic_track1:
 			print('Track 1 Data:')
 			print(f'{YELLOW}Raw Track Data               {GRAY}|{RESET}' + generic_track1.group(1))
 		else:
 			raise ValueError(f'Track 1 data is not found (data: {data})')
 
 	if track2_match:
 		pan, exp_date, service_code, discretionary_data = track2_match.groups()
 		formatted_pan = format_pan(pan)
 		formatted_exp_date = format_exp_date(exp_date)
 		print('Track 2 Data:')
 		print(f'{CYAN}Primary Account Number (PAN)  {GRAY}|{RESET} {formatted_pan}')
 		print(f'{CYAN}Expiration Date               {GRAY}|{RESET} {formatted_exp_date}')
 		print(f'{CYAN}Service Code                  {GRAY}|{RESET} {service_code}')
 		print(f'{CYAN}Discretionary Data            {GRAY}|{RESET} {discretionary_data}')
 		print(f'{CYAN}Raw Track Data                {GRAY}|{RESET} {track2_match.group(0)}')
 	else:
 		generic_track2 = re.search(r'(;[^\?]+\?)', data)
 		if generic_track2:
 			print('Track 2 Data:')
 			print(f'{CYAN}Raw Track Data                {GRAY}|{RESET}' + generic_track2.group(1))
 		else:
 			raise ValueError(f'Track 2 data is not found (data: {data})')
 
 	if track3_match:
 		print('Track 3 Data:')
 		print(f'{GRAY}Raw Track Data                {GRAY}|{RESET} {track3_match.group(0)}')
 	else:
 		raise ValueError(f'Track 3 data is not found (data: {data})')
 
 
 
 if __name__ == '__main__':
 	swipe_data = getpass.getpass(prompt='Please swipe the card: ')
 	parse_magnetic_stripe(swipe_data)

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