Pythonistaで指紋認証

概要

Pythonistaで指紋認証をしただけ

コード

touch_id.py

# coding: utf-8
from objc_util import *
import threading

NSBundle = ObjCClass('NSBundle')
LocalAuthentication = NSBundle.bundleWithPath_(
	'/System/Library/Frameworks/LocalAuthentication.framework')
LocalAuthentication.load()
LAContext = ObjCClass('LAContext')

class AuthFailedException(Exception):
	pass
	
class AuthCancelledException(AuthFailedException):
	pass

class AuthTimeoutException(AuthFailedException):
	pass

class AuthNotAvailableException(AuthFailedException):
	pass

class AuthFallbackMechanismSelectedException(AuthFailedException):
	pass


def is_available():
	context = LAContext.new().autorelease()
	return bool(context.canEvaluatePolicy_error_(1, None))


def authenticate(reason='', allow_passcode=True, timeout=None):
	if not is_available():
		raise AuthNotAvailableException('Touch ID is not available.')
	policy = 2 if allow_passcode else 1
	context = LAContext.new().autorelease()
	event = threading.Event()
	result = {}

	def callback(_cmd, success, _error):
		result['success'] = success
		if _error:
			error = ObjCInstance(_error)
			result['error'] = error
		event.set()

	handler = ObjCBlock(
		callback, restype=None, argtypes=[c_void_p, c_bool, c_void_p])
	context.evaluatePolicy_localizedReason_reply_(policy, reason, handler)
	if not event.wait(timeout):
		context.invalidate()
		raise AuthTimeoutException('Timeout')
	success = result.get('success', False)
	error = result.get('error')
	if success:
		return True
	elif error:
		error_code = error.code()
		if error_code == -2:
			raise AuthCancelledException('Cancelled by user')
		elif error_code == -3:
			raise AuthFallbackMechanismSelectedException(
				'Fallback authentication mechanism selected')
		else:
			desc = error.localizedDescription() or 'Unknown error'
			raise AuthFailedException(desc)
	else:
		raise AuthFailedException('Unknown error')


# 例
def main():
	try:
		reason = 'We need you fingerprint.'
		authenticate(reason,allow_passcode=True)
		print('Success!')
	except AuthFailedException as e:
		print(e)


if __name__ == '__main__':
	main()

感想

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