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