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147 lines
4.9 KiB
147 lines
4.9 KiB
# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2018 SatoshiLabs and contributors
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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 version 3
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# as published by the Free Software Foundation.
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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 License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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import importlib
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import logging
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from typing import Iterable, List, Set, Type
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from ..protobuf import MessageType
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if False:
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# mark Set and List as used, otherwise they only exist in comments
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List, Set
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LOG = logging.getLogger(__name__)
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class TransportException(Exception):
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pass
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class Transport:
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"""Raw connection to a Trezor device.
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Transport subclass represents a kind of communication link: Trezor Bridge, WebUSB
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or USB-HID connection, or UDP socket of listening emulator(s).
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It can also enumerate devices available over this communication link, and return
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them as instances.
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Transport instance is a thing that:
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- can be identified and requested by a string URI-like path
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- can open and close sessions, which enclose related operations
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- can read and write protobuf messages
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You need to implement a new Transport subclass if you invent a new way to connect
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a Trezor device to a computer.
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"""
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PATH_PREFIX = None # type: str
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def __str__(self) -> str:
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return self.get_path()
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def get_path(self) -> str:
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raise NotImplementedError
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def begin_session(self) -> None:
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raise NotImplementedError
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def end_session(self) -> None:
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raise NotImplementedError
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def read(self) -> MessageType:
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raise NotImplementedError
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def write(self, message: MessageType) -> None:
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raise NotImplementedError
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@classmethod
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def enumerate(cls) -> Iterable["Transport"]:
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raise NotImplementedError
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@classmethod
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def find_by_path(cls, path: str, prefix_search: bool = False) -> "Transport":
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for device in cls.enumerate():
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if (
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path is None
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or device.get_path() == path
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or (prefix_search and device.get_path().startswith(path))
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):
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return device
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raise TransportException(
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"{} device not found: {}".format(cls.PATH_PREFIX, path)
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)
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def all_transports() -> Iterable[Type[Transport]]:
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transports = set() # type: Set[Type[Transport]]
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for modname in ("bridge", "hid", "udp", "webusb"):
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try:
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# Import the module and find the Transport class.
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# To avoid iterating over every item, the module should assign its Transport class
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# to a constant named TRANSPORT.
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module = importlib.import_module("." + modname, __name__)
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try:
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transports.add(getattr(module, "TRANSPORT"))
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except AttributeError:
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LOG.warning("Skipping broken module {}".format(modname))
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except ImportError as e:
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LOG.info("Failed to import module {}: {}".format(modname, e))
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return transports
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def enumerate_devices() -> Iterable[Transport]:
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devices = [] # type: List[Transport]
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for transport in all_transports():
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name = transport.__name__
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try:
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found = list(transport.enumerate())
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LOG.info("Enumerating {}: found {} devices".format(name, len(found)))
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devices.extend(found)
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except NotImplementedError:
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LOG.error("{} does not implement device enumeration".format(name))
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except Exception as e:
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excname = e.__class__.__name__
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LOG.error("Failed to enumerate {}. {}: {}".format(name, excname, e))
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return devices
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def get_transport(path: str = None, prefix_search: bool = False) -> Transport:
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if path is None:
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try:
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return next(iter(enumerate_devices()))
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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: str, b: str) -> bool:
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return a.startswith(b) or b.startswith(a)
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LOG.info(
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"looking for device by {}: {}".format(
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"prefix" if prefix_search else "full path", path
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)
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)
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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("Could not find device by path: {}".format(path))
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