mmilata/ble-rebased
tychovrahe 12 months ago committed by Martin Milata
parent a8ae9496cb
commit 61defd6905

@ -76,6 +76,9 @@ binsize = "^0.1.3"
toiftool = {path = "./python/tools/toiftool", develop = true, python = ">=3.8"}
trezor-pylint-plugin = {path = "./tools/trezor-pylint-plugin", develop = true}
# ble
dbus-next = "*"
[tool.poetry.dev-dependencies]
scan-build = "*"
towncrier = "^23.6.0"

@ -7,3 +7,4 @@ construct>=2.9,!=2.10.55
typing_extensions>=3.10
dataclasses ; python_version<'3.7'
construct-classes>=0.1.2
dbus-next>=0.2.3

@ -25,7 +25,7 @@ per-file-ignores =
helper-scripts/*:I
tools/*:I
tests/*:I
known-modules = libusb1:[usb1],hidapi:[hid],PyQt5:[PyQt5.QtWidgets,PyQt5.QtGui,PyQt5.QtCore]
known-modules = libusb1:[usb1],hidapi:[hid],PyQt5:[PyQt5.QtWidgets,PyQt5.QtGui,PyQt5.QtCore],dbus-next:[dbus_next]
[isort]
profile = black

@ -0,0 +1,59 @@
import typing as t
from .. import messages
from ..tools import session
if t.TYPE_CHECKING:
from ..client import TrezorClient
@session
def update(
client: "TrezorClient",
datfile: bytes,
binfile: bytes,
progress_update: t.Callable[[int], t.Any] = lambda _: None,
):
chunk_len = 4096
offset = 0
resp = client.call(
messages.UploadBLEFirmwareInit(init_data=datfile, binsize=len(binfile))
)
while isinstance(resp, messages.UploadBLEFirmwareNextChunk):
payload = binfile[offset : offset + chunk_len]
resp = client.call(messages.UploadBLEFirmwareChunk(data=payload))
progress_update(chunk_len)
offset += chunk_len
if isinstance(resp, messages.Success):
return
else:
raise RuntimeError(f"Unexpected message {resp}")
@session
def erase_bonds(
client: "TrezorClient",
):
resp = client.call(messages.EraseBonds())
if isinstance(resp, messages.Success):
return
else:
raise RuntimeError(f"Unexpected message {resp}")
@session
def disconnect(
client: "TrezorClient",
):
resp = client.call(messages.Disconnect())
if isinstance(resp, messages.Success):
return
else:
raise RuntimeError(f"Unexpected message {resp}")

@ -21,7 +21,7 @@ from typing import TYPE_CHECKING, Any, Callable, Dict, Optional
import click
from .. import exceptions, transport
from .. import exceptions, messages, transport
from ..client import TrezorClient
from ..ui import ClickUI, ScriptUI
@ -110,6 +110,12 @@ class TrezorConnection:
except transport.DeviceIsBusy:
click.echo("Device is in use by another process.")
sys.exit(1)
except exceptions.TrezorFailure as e:
if e.code is messages.FailureType.DeviceIsBusy:
click.echo(str(e))
sys.exit(1)
else:
raise e
except Exception:
click.echo("Failed to find a Trezor device.")
if self.path is not None:

@ -0,0 +1,139 @@
# This file is part of the Trezor project.
#
# Copyright (C) 2012-2022 SatoshiLabs and contributors
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the License along with this library.
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
import json
import sys
import zipfile
from typing import TYPE_CHECKING, BinaryIO
import click
from .. import ble, exceptions
from ..transport.ble import BleProxy
from . import with_client
if TYPE_CHECKING:
from ..client import TrezorClient
@click.group(name="ble")
def cli() -> None:
"""BLE commands."""
@cli.command()
# fmt: off
@click.argument("package", type=click.File("rb"))
# fmt: on
@with_client
def update(
client: "TrezorClient",
package: BinaryIO,
) -> None:
"""Upload new BLE firmware to device."""
with zipfile.ZipFile(package) as archive:
manifest = archive.read("manifest.json")
mainfest_data = json.loads(manifest.decode("utf-8"))["manifest"]
for k in mainfest_data.keys():
binfile = archive.read(mainfest_data[k]["bin_file"])
datfile = archive.read(mainfest_data[k]["dat_file"])
"""Perform the final act of loading the firmware into Trezor."""
try:
click.echo("Uploading...\r", nl=False)
with click.progressbar(
label="Uploading", length=len(binfile), show_eta=False
) as bar:
ble.update(client, datfile, binfile, bar.update)
click.echo("Update successful.")
except exceptions.Cancelled:
click.echo("Update aborted on device.")
except exceptions.TrezorException as e:
click.echo(f"Update failed: {e}")
sys.exit(3)
@cli.command()
def connect() -> None:
"""Connect to the device via BLE."""
ble = BleProxy()
devices = [d for d in ble.lookup() if d.connected]
if len(devices) == 0:
click.echo("Scanning...")
devices = ble.scan()
if len(devices) == 0:
click.echo("No BLE devices found")
return
else:
click.echo("Found %d BLE device(s)" % len(devices))
for device in devices:
click.echo(f"Device: {device.name}, {device.address}")
device = devices[0]
click.echo(f"Connecting to {device.name}...")
ble.connect(device.address)
click.echo("Connected")
@with_client
def disconnect_device(client: "TrezorClient") -> None:
"""Disconnect from device side."""
try:
ble.disconnect(client)
except exceptions.Cancelled:
click.echo("Disconnect aborted on device.")
except exceptions.TrezorException as e:
click.echo(f"Disconnect failed: {e}")
sys.exit(3)
@cli.command()
@click.option("--device", is_flag=True, help="Disconnect from device side.")
def disconnect(device: bool) -> None:
if device:
disconnect_device()
else:
ble_proxy = BleProxy()
devices = [d for d in ble_proxy.lookup() if d.connected]
if len(devices) == 0:
click.echo("No BLE devices found")
return
ble_proxy.connect(devices[0].address)
ble_proxy.disconnect()
@cli.command()
@with_client
def erase_bonds(
client: "TrezorClient",
) -> None:
"""Erase BLE bonds on device."""
try:
ble.erase_bonds(client)
click.echo("Erase successful.")
except exceptions.Cancelled:
click.echo("Erase aborted on device.")
except exceptions.TrezorException as e:
click.echo(f"Update failed: {e}")
sys.exit(3)

@ -32,6 +32,7 @@ from . import (
AliasedGroup,
TrezorConnection,
binance,
ble,
btc,
cardano,
cosi,
@ -88,6 +89,7 @@ COMMAND_ALIASES = {
"upgrade-firmware": firmware.update,
"firmware-upgrade": firmware.update,
"firmware-update": firmware.update,
"ble-update": ble.update,
}
@ -418,6 +420,7 @@ cli.add_command(tezos.cli)
cli.add_command(firmware.cli)
cli.add_command(debug.cli)
cli.add_command(ble.cli)
#
# Main

@ -0,0 +1,350 @@
# !/usr/bin/python3
# pyright: off
import asyncio
import io
import logging
import dbus_next
LOG = logging.getLogger(__name__)
def unwrap_properties(properties):
return {k: v.value for k, v in properties.items()}
class TealBlue:
@classmethod
async def create(cls):
self = cls()
self._bus = await dbus_next.aio.MessageBus(
bus_type=dbus_next.constants.BusType.SYSTEM, negotiate_unix_fd=True
).connect()
obj = await self.get_object("org.bluez", "/")
self._bluez = obj.get_interface("org.freedesktop.DBus.ObjectManager")
return self
async def find_adapter(self, mac_filter=""):
"""Find the first adapter matching mac_filter."""
objects = await self._bluez.call_get_managed_objects()
for path in sorted(objects.keys()):
interfaces = objects[path]
if "org.bluez.Adapter1" not in interfaces:
continue
properties = unwrap_properties(interfaces["org.bluez.Adapter1"])
if mac_filter not in properties["Address"]:
continue
return await Adapter.create(self, path, properties)
raise Exception("No adapter found")
async def get_object(self, name, path):
introspection = await self._bus.introspect(name, path)
obj = self._bus.get_proxy_object(name, path, introspection)
return obj
class Adapter:
@classmethod
async def create(cls, teal, path, properties):
self = cls()
self._teal = teal
self._path = path
self._properties = properties
obj = await self._teal.get_object("org.bluez", path)
self._object = obj.get_interface("org.bluez.Adapter1")
return self
def __repr__(self):
return "<tealblue.Adapter address=%s>" % (self._properties["Address"])
async def devices(self):
"""
Returns the devices that BlueZ has discovered.
"""
objects = await self._teal._bluez.call_get_managed_objects()
devices = []
for path in sorted(objects.keys()):
interfaces = objects[path]
if "org.bluez.Device1" not in interfaces:
continue
properties = unwrap_properties(interfaces["org.bluez.Device1"])
devices.append(await Device.create(self._teal, path, properties))
return devices
async def scan(self, timeout_s):
return await Scanner.create(self._teal, self, await self.devices(), timeout_s)
class Scanner:
@classmethod
async def create(cls, teal, adapter, initial_devices, timeout_s):
self = cls()
self._teal = teal
self._adapter = adapter
self._was_discovering = adapter._properties[
"Discovering"
] # TODO get current value, or watch property changes
self._queue = asyncio.Queue()
self.timeout_s = timeout_s
for device in initial_devices:
self._queue.put_nowait((device._path, device._properties))
self._teal._bluez.on_interfaces_added(self._on_iface_added)
if not self._was_discovering:
await self._adapter._object.call_start_discovery()
return self
def _on_iface_added(self, path, interfaces):
if "org.bluez.Device1" not in interfaces:
return
if not path.startswith(self._adapter._path + "/"):
return
properties = unwrap_properties(interfaces["org.bluez.Device1"])
self._queue.put_nowait((path, properties))
async def __aenter__(self):
return self
async def __aexit__(self, type, value, traceback):
if not self._was_discovering:
await self._adapter._object.call_stop_discovery()
self._teal._bluez.off_interfaces_added(self._on_iface_added)
def __aiter__(self):
return self
async def __anext__(self):
try:
(path, properties) = await asyncio.wait_for(
self._queue.get(), self.timeout_s
)
return await Device.create(self._teal, path, properties)
except asyncio.TimeoutError:
raise StopAsyncIteration
class Device:
@classmethod
async def create(cls, teal, path, properties):
self = cls()
self._teal = teal
self._path = path
self._properties = properties
self._services_resolved = asyncio.Event()
self._services = None
if properties["ServicesResolved"]:
self._services_resolved.set()
# Listen to device events (connect, disconnect, ServicesResolved, ...)
obj = await self._teal.get_object("org.bluez", path)
self._device = obj.get_interface("org.bluez.Device1")
obj = await self._teal.get_object("org.bluez", path)
self._device_props = obj.get_interface("org.freedesktop.DBus.Properties")
self._device_props.on_properties_changed(self._on_prop_changed)
return self
def __del__(self):
self._device_props.off_properties_changed(self._on_prop_changed)
def __repr__(self):
return "<tealblue.Device address=%s name=%r>" % (self.address, self.name)
def _on_prop_changed(self, _interface, changed_props, invalidated_props):
changed_props = unwrap_properties(changed_props)
LOG.debug(
f"prop changed: device {self._path} {changed_props.keys()} {invalidated_props}"
)
for key, value in changed_props.items():
self._properties[key] = value
for key in invalidated_props:
del self._properties[key]
if "ServicesResolved" in changed_props:
if changed_props["ServicesResolved"]:
self._services_resolved.set()
else:
self._services_resolved.clear()
async def connect(self):
await self._device.call_connect()
async def disconnect(self):
await self._device.call_disconnect()
async def services(self):
await self._services_resolved.wait()
if self._services is None:
self._services = {}
objects = await self._teal._bluez.call_get_managed_objects()
for path in sorted(objects.keys()):
if not path.startswith(self._path + "/"):
continue
if "org.bluez.GattService1" in objects[path]:
properties = unwrap_properties(
objects[path]["org.bluez.GattService1"]
)
service = Service(self._teal, self, path, properties)
self._services[service.uuid] = service
elif "org.bluez.GattCharacteristic1" in objects[path]:
properties = unwrap_properties(
objects[path]["org.bluez.GattCharacteristic1"]
)
characterstic = await Characteristic.create(
self._teal, self, path, properties
)
for service in self._services.values():
if properties["Service"] == service._path:
service.characteristics[characterstic.uuid] = characterstic
return self._services
@property
def connected(self):
return bool(self._properties["Connected"])
@property
def services_resolved(self):
return bool(self._properties["ServicesResolved"])
@property
def UUIDs(self):
return [str(s) for s in self._properties["UUIDs"]]
@property
def address(self):
return str(self._properties["Address"])
@property
def name(self):
if "Name" not in self._properties:
return None
return str(self._properties["Name"])
@property
def alias(self):
if "Alias" not in self._properties:
return None
return str(self._properties["Alias"])
class Service:
def __init__(self, teal, device, path, properties):
self._device = device
self._teal = teal
self._path = path
self._properties = properties
self.characteristics = {}
def __repr__(self):
return "<tealblue.Service device=%s uuid=%s>" % (
self._device.address,
self.uuid,
)
@property
def uuid(self):
return str(self._properties["UUID"])
class Characteristic:
def __init__(self):
self._properties = {}
@classmethod
async def create(cls, teal, device, path, properties):
self = cls()
self._device = device
self._teal = teal
self._path = path
self._properties = properties
self._values = asyncio.Queue()
obj = await self._teal.get_object("org.bluez", path)
self._char = obj.get_interface("org.bluez.GattCharacteristic1")
self._props = obj.get_interface("org.freedesktop.DBus.Properties")
self._props.on_properties_changed(self._on_prop_changed)
return self
def __repr__(self):
return "<tealblue.Characteristic device=%s uuid=%s>" % (
self._device.address,
self.uuid,
)
def __del__(self):
self._props.off_properties_changed(self._on_prop_changed)
def _on_prop_changed(self, _interface, changed_props, invalidated_props):
changed_props = unwrap_properties(changed_props)
LOG.debug(
f"prop changed: characteristic {changed_props.keys()} {invalidated_props}"
)
for key, value in changed_props.items():
self._properties[key] = bytes(value)
for key in invalidated_props:
del self._properties[key]
if "Value" in changed_props:
self._values.put_nowait(changed_props["Value"])
async def acquire(self, write: bool = False) -> tuple[io.FileIO, int]:
if write:
fd, mtu = await self._char.call_acquire_write({})
mode = "w"
else:
fd, mtu = await self._char.call_acquire_notify({})
mode = "r"
f = io.FileIO(fd, mode)
LOG.debug(f"acquired {self.uuid} ({mode})")
return f, mtu
async def read(self) -> bytes:
return bytes(await self._values.get())
async def write(self, value, command=True):
ty = "command" if command else "request"
await self._char.call_write_value(value, {"type": dbus_next.Variant("s", ty)})
#
# async def write(self, value, command=True):
# start = time.time()
# try:
# if command:
# await self._char.call_write_value(value, {"type": "command"})
# else:
# await self._char.call_write_value(value, {"type": "request"})
#
# except dbus_next.DBusError as e:
# if (
# e.type == "org.bluez.Error.Failed"
# and e.text == "Not connected"
# ):
# raise NotConnectedError()
# else:
# raise # some other error
#
# # Workaround: if the write took very long, it is possible the connection
# # broke (without causing an exception). So check whether we are still
# # connected.
# # I think this is a bug in BlueZ.
# if time.time() - start > 0.5:
# if not self._device._device_props.call_get("org.bluez.Device1", "Connected"):
# raise NotConnectedError()
async def start_notify(self):
await self._char.call_start_notify()
async def stop_notify(self):
await self._char.call_stop_notify()
@property
def uuid(self):
return str(self._properties["UUID"])

@ -113,6 +113,7 @@ class Transport:
def all_transports() -> Iterable[Type["Transport"]]:
from .ble import BleTransport
from .bridge import BridgeTransport
from .hid import HidTransport
from .udp import UdpTransport
@ -123,6 +124,7 @@ def all_transports() -> Iterable[Type["Transport"]]:
HidTransport,
UdpTransport,
WebUsbTransport,
BleTransport,
)
return set(t for t in transports if t.ENABLED)

@ -0,0 +1,265 @@
# This file is part of the Trezor project.
#
# Copyright (C) 2012-2022 SatoshiLabs and contributors
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the License along with this library.
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
import asyncio
import logging
from dataclasses import dataclass
from multiprocessing import Pipe, Process
from multiprocessing.connection import Connection
from typing import TYPE_CHECKING, Any, Iterable, List, Optional
from . import TransportException
from .protocol import ProtocolBasedTransport, ProtocolV1
if TYPE_CHECKING:
from ..models import TrezorModel
LOG = logging.getLogger(__name__)
NUS_SERVICE_UUID = "6e400001-b5a3-f393-e0a9-e50e24dcca9e"
NUS_CHARACTERISTIC_RX = "6e400002-b5a3-f393-e0a9-e50e24dcca9e"
NUS_CHARACTERISTIC_TX = "6e400003-b5a3-f393-e0a9-e50e24dcca9e"
@dataclass
class Device:
address: str
name: str
connected: bool
class BleTransport(ProtocolBasedTransport):
ENABLED = True
PATH_PREFIX = "ble"
_ble = None
def __init__(self, mac_addr: str) -> None:
self.device = mac_addr
super().__init__(protocol=ProtocolV1(self, replen=244))
def get_path(self) -> str:
return "{}:{}".format(self.PATH_PREFIX, self.device)
def find_debug(self) -> "BleTransport":
return BleTransport(self.device)
@classmethod
def enumerate(
cls, _models: Optional[Iterable["TrezorModel"]] = None
) -> Iterable["BleTransport"]:
devices = cls.ble().lookup()
return [BleTransport(device.address) for device in devices if device.connected]
@classmethod
def _try_path(cls, path: str) -> "BleTransport":
devices = cls.enumerate(None)
devices = [d for d in devices if d.device == path]
if len(devices) == 0:
raise TransportException(f"No BLE device: {path}")
return devices[0]
@classmethod
def find_by_path(cls, path: str, prefix_search: bool = False) -> "BleTransport":
if not prefix_search:
raise TransportException
if prefix_search:
return super().find_by_path(path, prefix_search)
else:
raise TransportException(f"No BLE device: {path}")
def open(self) -> None:
self.ble().connect(self.device)
def close(self) -> None:
pass
def write_chunk(self, chunk: bytes) -> None:
self.ble().write(chunk)
def read_chunk(self) -> bytes:
chunk = self.ble().read()
# LOG.log(DUMP_PACKETS, f"received packet: {chunk.hex()}")
if len(chunk) != 64:
raise TransportException(f"Unexpected chunk size: {len(chunk)}")
return bytearray(chunk)
@classmethod
def ble(cls) -> "BleProxy":
if cls._ble is None:
cls._ble = BleProxy()
return cls._ble
class BleProxy:
pipe = None
process = None
def __init__(self):
if self.pipe is not None:
return
parent_pipe, child_pipe = Pipe()
self.pipe = parent_pipe
self.process = Process(target=BleAsync, args=(child_pipe,), daemon=True)
self.process.start()
def __getattr__(self, name: str):
def f(*args: Any, **kwargs: Any):
assert self.pipe is not None
self.pipe.send((name, args, kwargs))
result = self.pipe.recv()
if isinstance(result, BaseException):
raise result
return result
return f
class BleAsync:
def __init__(self, pipe: Connection):
asyncio.run(self.main(pipe))
async def main(self, pipe: Connection):
from ..tealblue import TealBlue
tb = await TealBlue.create()
# TODO: add cli option for mac_filter and pass it here
self.adapter = await tb.find_adapter()
# TODO: currently only one concurrent device is supported
# To support more devices, connect() needs to return a Connection and also has to
# spawn a task that will forward data between that Connection and rx,tx.
self.current = None
self.rx = None
self.tx = None
self.devices = {}
await self.lookup() # populate self.devices
LOG.debug("async BLE process started")
while True:
await ready(pipe)
cmd, args, kwargs = pipe.recv()
try:
result = await getattr(self, cmd)(*args, **kwargs)
except Exception as e:
LOG.exception("Error in async BLE process:")
await ready(pipe, write=True)
pipe.send(e)
break
else:
await ready(pipe, write=True)
pipe.send(result)
async def lookup(self) -> List[Device]:
self.devices.clear()
for device in await self.adapter.devices():
if NUS_SERVICE_UUID in device.UUIDs:
self.devices[device.address] = device
return [
Device(device.address, device.name, device.connected)
for device in self.devices.values()
]
async def scan(self) -> List[Device]:
LOG.debug("Initiating scan")
# TODO: configurable timeout
scanner = await self.adapter.scan(2)
self.devices.clear()
async with scanner:
async for device in scanner:
if NUS_SERVICE_UUID in device.UUIDs:
if device.address not in self.devices:
LOG.debug(f"scan: {device.address}: {device.name}")
self.devices[device.address] = device
return [
Device(device.address, device.name, device.connected)
for device in self.devices.values()
]
async def connect(self, address: str):
if self.current == address:
return
# elif self.current is not None:
# self.devices[self.current].disconnect()
ble_device = self.devices[address]
if not ble_device.connected:
LOG.info("Connecting to %s (%s)..." % (ble_device.name, ble_device.address))
await ble_device.connect()
else:
LOG.info("Connected to %s (%s)." % (ble_device.name, ble_device.address))
services = await ble_device.services()
nus_service = services[NUS_SERVICE_UUID]
self.rx, _mtu = await nus_service.characteristics[
NUS_CHARACTERISTIC_RX
].acquire(write=True)
self.tx, _mtu = await nus_service.characteristics[
NUS_CHARACTERISTIC_TX
].acquire()
self.current = address
async def disconnect(self):
if self.current is None:
return
ble_device = self.devices[self.current]
if ble_device.connected:
LOG.info(
"Disconnecting from %s (%s)..." % (ble_device.name, ble_device.address)
)
await ble_device.disconnect()
else:
LOG.info(
"Disconnected from %s (%s)." % (ble_device.name, ble_device.address)
)
self.current = None
self.rx = None
self.tx = None
async def read(self):
assert self.tx is not None
await ready(self.tx)
return self.tx.read()
async def write(self, chunk: bytes):
assert self.rx is not None
await ready(self.rx, write=True)
self.rx.write(chunk)
async def ready(f: Any, write: bool = False):
"""Asynchronously wait for file-like object to become ready for reading or writing."""
fd = f.fileno()
loop = asyncio.get_event_loop()
event = asyncio.Event()
if write:
def callback():
event.set()
loop.remove_writer(fd)
loop.add_writer(fd, callback)
else:
def callback():
event.set()
loop.remove_reader(fd)
loop.add_reader(fd, callback)
await event.wait()

@ -75,8 +75,9 @@ class Protocol:
its messages.
"""
def __init__(self, handle: Handle) -> None:
def __init__(self, handle: Handle, replen: int = REPLEN) -> None:
self.handle = handle
self.replen = replen
self.session_counter = 0
# XXX we might be able to remove this now that TrezorClient does session handling
@ -133,10 +134,10 @@ class ProtocolV1(Protocol):
while buffer:
# Report ID, data padded to 63 bytes
chunk = b"?" + buffer[: REPLEN - 1]
chunk = chunk.ljust(REPLEN, b"\x00")
chunk = b"?" + buffer[: self.replen - 1]
chunk = chunk.ljust(self.replen, b"\x00")
self.handle.write_chunk(chunk)
buffer = buffer[63:]
buffer = buffer[self.replen - 1 :]
def read(self) -> MessagePayload:
buffer = bytearray()

@ -61,6 +61,8 @@ class WebUsbHandle:
self.handle.claimInterface(self.interface)
except usb1.USBErrorAccess as e:
raise DeviceIsBusy(self.device) from e
except usb1.USBErrorBusy as e:
raise DeviceIsBusy(self.device) from e
def close(self) -> None:
if self.handle is not None:

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