mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-26 01:18:28 +00:00
a5aa515631
had to add a typestub for PIL due to https://github.com/microsoft/pyright/issues/7832 We should remove it if that is either fixed or, if I fail to convince Eric, after the relevant type information is added to Pillow [no changelog]
104 lines
3.5 KiB
Python
104 lines
3.5 KiB
Python
# 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>.
|
|
|
|
from __future__ import annotations
|
|
|
|
import io
|
|
from types import ModuleType
|
|
from typing import Dict, Optional, Tuple, Type, TypeVar
|
|
|
|
from typing_extensions import Self
|
|
|
|
from . import messages, protobuf
|
|
|
|
T = TypeVar("T")
|
|
|
|
|
|
class ProtobufMapping:
|
|
"""Mapping of protobuf classes to Python classes"""
|
|
|
|
def __init__(self) -> None:
|
|
self.type_to_class: Dict[int, Type[protobuf.MessageType]] = {}
|
|
self.class_to_type_override: Dict[Type[protobuf.MessageType], int] = {}
|
|
|
|
def register(
|
|
self,
|
|
msg_class: Type[protobuf.MessageType],
|
|
msg_wire_type: Optional[int] = None,
|
|
) -> None:
|
|
"""Register a Python class as a protobuf type.
|
|
|
|
If `msg_wire_type` is specified, it is used instead of the internal value in
|
|
`msg_class`.
|
|
|
|
Any existing registrations are overwritten.
|
|
"""
|
|
if msg_wire_type is not None:
|
|
self.class_to_type_override[msg_class] = msg_wire_type
|
|
elif msg_class.MESSAGE_WIRE_TYPE is None:
|
|
raise ValueError("Cannot register class without wire type")
|
|
else:
|
|
msg_wire_type = msg_class.MESSAGE_WIRE_TYPE
|
|
|
|
self.type_to_class[msg_wire_type] = msg_class
|
|
|
|
def encode(self, msg: protobuf.MessageType) -> Tuple[int, bytes]:
|
|
"""Serialize a Python protobuf class.
|
|
|
|
Returns the message wire type and a byte representation of the protobuf message.
|
|
"""
|
|
wire_type = self.class_to_type_override.get(type(msg), msg.MESSAGE_WIRE_TYPE)
|
|
if wire_type is None:
|
|
raise ValueError("Cannot encode class without wire type")
|
|
|
|
buf = io.BytesIO()
|
|
protobuf.dump_message(buf, msg)
|
|
return wire_type, buf.getvalue()
|
|
|
|
def decode(self, msg_wire_type: int, msg_bytes: bytes) -> protobuf.MessageType:
|
|
"""Deserialize a protobuf message into a Python class."""
|
|
cls = self.type_to_class[msg_wire_type]
|
|
buf = io.BytesIO(msg_bytes)
|
|
return protobuf.load_message(buf, cls)
|
|
|
|
@classmethod
|
|
def from_module(cls, module: ModuleType) -> Self:
|
|
"""Generate a mapping from a module.
|
|
|
|
The module must have a `MessageType` enum that specifies individual wire types.
|
|
"""
|
|
mapping = cls()
|
|
|
|
message_types = getattr(module, "MessageType")
|
|
for entry in message_types:
|
|
msg_class = getattr(module, entry.name, None)
|
|
if msg_class is None:
|
|
raise ValueError(
|
|
f"Implementation of protobuf message '{entry.name}' is missing"
|
|
)
|
|
|
|
if msg_class.MESSAGE_WIRE_TYPE != entry.value:
|
|
raise ValueError(
|
|
f"Inconsistent wire type and MessageType record for '{entry.name}'"
|
|
)
|
|
|
|
mapping.register(msg_class)
|
|
|
|
return mapping
|
|
|
|
|
|
DEFAULT_MAPPING = ProtobufMapping.from_module(messages)
|