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# Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Interface to handle end to end flow of U2F signing."""
import sys
from pyu2f.convenience import baseauthenticator
from pyu2f.convenience import customauthenticator
from pyu2f.convenience import localauthenticator
def CreateCompositeAuthenticator(origin):
authenticators = [customauthenticator.CustomAuthenticator(origin),
localauthenticator.LocalAuthenticator(origin)]
return CompositeAuthenticator(authenticators)
class CompositeAuthenticator(baseauthenticator.BaseAuthenticator):
"""Composes multiple authenticators into a single authenticator.
Priority is based on the order of the list initialized with the instance.
"""
def __init__(self, authenticators):
self.authenticators = authenticators
def Authenticate(self, app_id, challenge_data,
print_callback=sys.stderr.write):
"""See base class."""
for authenticator in self.authenticators:
if authenticator.IsAvailable():
result = authenticator.Authenticate(app_id,
challenge_data,
print_callback)
return result
raise ValueError('No valid authenticators found')
def IsAvailable(self):
"""See base class."""
return True
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