# Copyright (c) 2018 Yubico AB
# All rights reserved.
#
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#   without modification, are permitted provided that the following
#   conditions are met:
#
#    1. Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#    2. Redistributions in binary form must reproduce the above
#       copyright notice, this list of conditions and the following
#       disclaimer in the documentation and/or other materials provided
#       with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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"""
Connects to each FIDO device found, and causes them all to blink until the user
triggers one to select it. A new credential is created for that authenticator,
and the operation is cancelled for the others.
"""
from __future__ import print_function, absolute_import, unicode_literals

from fido2.hid import CtapHidDevice, STATUS
from fido2.client import Fido2Client, ClientError
from threading import Event, Thread
import sys

# Locate a device
devs = list(CtapHidDevice.list_devices())
if not devs:
    print("No FIDO device found")
    sys.exit(1)

clients = [Fido2Client(d, "https://example.com") for d in devs]

# Prepare parameters for makeCredential
rp = {"id": "example.com", "name": "Example RP"}
user = {"id": b"user_id", "name": "A. User"}
challenge = b"Y2hhbGxlbmdl"
cancel = Event()
attestation, client_data = None, None

has_prompted = False


def on_keepalive(status):
    global has_prompted  # Don't prompt for each device.
    if status == STATUS.UPNEEDED and not has_prompted:
        print("\nTouch your authenticator device now...\n")
        has_prompted = True


def work(client):
    global attestation, client_data
    try:
        attestation, client_data = client.make_credential(
            {
                "rp": rp,
                "user": user,
                "challenge": challenge,
                "pubKeyCredParams": [{"type": "public-key", "alg": -7}],
            },
            event=cancel,
            on_keepalive=on_keepalive,
        )
    except ClientError as e:
        if e.code != ClientError.ERR.TIMEOUT:
            raise
        else:
            return
    cancel.set()
    print("New credential created!")
    print("ATTESTATION OBJECT:", attestation)
    print()
    print("CREDENTIAL DATA:", attestation.auth_data.credential_data)


threads = []
for client in clients:
    t = Thread(target=work, args=(client,))
    threads.append(t)
    t.start()

for t in threads:
    t.join()

if not cancel.is_set():
    print("Operation timed out!")