mirror of
https://github.com/trezor/trezor-firmware.git
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98 lines
3.1 KiB
Python
98 lines
3.1 KiB
Python
# This file is part of the TREZOR project.
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#
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# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
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# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
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# Copyright (C) 2016 Jochen Hoenicke <hoenicke@gmail.com>
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library. If not, see <http://www.gnu.org/licenses/>.
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class TransportException(Exception):
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pass
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class Transport(object):
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def __init__(self):
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self.session_counter = 0
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def __str__(self):
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return self.get_path()
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def get_path(self):
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return '{}:{}'.format(self.PATH_PREFIX, self.device)
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def session_begin(self):
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if self.session_counter == 0:
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self.open()
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self.session_counter += 1
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def session_end(self):
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self.session_counter = max(self.session_counter - 1, 0)
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if self.session_counter == 0:
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self.close()
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def open(self):
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raise NotImplementedError
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def close(self):
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raise NotImplementedError
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@classmethod
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def enumerate(cls):
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raise NotImplementedError
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@classmethod
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def find_by_path(cls, path, prefix_search=False):
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for device in cls.enumerate():
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if path is None or device.get_path() == path \
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or (prefix_search and device.get_path().startswith(path)):
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return device
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raise TransportException('{} device not found: {}'.format(cls.PATH_PREFIX, path))
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def all_transports():
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from .bridge import BridgeTransport
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from .hid import HidTransport
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from .udp import UdpTransport
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from .webusb import WebUsbTransport
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return (BridgeTransport, HidTransport, UdpTransport, WebUsbTransport)
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def enumerate_devices():
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return [device
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for transport in all_transports()
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for device in transport.enumerate()]
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def get_transport(path=None, prefix_search=False):
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if path is None:
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try:
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return enumerate_devices()[0]
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except IndexError:
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raise Exception("No TREZOR device found") from None
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# Find whether B is prefix of A (transport name is part of the path)
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# or A is prefix of B (path is a prefix, or a name, of transport).
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# This naively expects that no two transports have a common prefix.
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def match_prefix(a, b):
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return a.startswith(b) or b.startswith(a)
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transports = [t for t in all_transports() if match_prefix(path, t.PATH_PREFIX)]
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if transports:
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return transports[0].find_by_path(path, prefix_search=prefix_search)
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raise Exception("Unknown path prefix '%s'" % prefix)
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