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https://github.com/varun-r-mallya/py-libp2p.git
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93 lines
3.0 KiB
Python
93 lines
3.0 KiB
Python
from typing import (
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cast,
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)
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from noise.connection import NoiseConnection as NoiseState
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from libp2p.abc import (
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IRawConnection,
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)
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from libp2p.io.abc import (
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EncryptedMsgReadWriter,
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ReadWriteCloser,
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)
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from libp2p.io.msgio import (
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FixedSizeLenMsgReadWriter,
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)
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SIZE_NOISE_MESSAGE_LEN = 2
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MAX_NOISE_MESSAGE_LEN = 2 ** (8 * SIZE_NOISE_MESSAGE_LEN) - 1
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SIZE_NOISE_MESSAGE_BODY_LEN = 2
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MAX_NOISE_MESSAGE_BODY_LEN = MAX_NOISE_MESSAGE_LEN - SIZE_NOISE_MESSAGE_BODY_LEN
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BYTE_ORDER = "big"
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# | Noise packet |
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# < 2 bytes -><- 65535 ->
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# | noise msg len | noise msg |
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class NoisePacketReadWriter(FixedSizeLenMsgReadWriter):
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size_len_bytes = SIZE_NOISE_MESSAGE_LEN
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class BaseNoiseMsgReadWriter(EncryptedMsgReadWriter):
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"""
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The base implementation of noise message reader/writer.
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`encrypt` and `decrypt` are not implemented here, which should be
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implemented by the subclasses.
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"""
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read_writer: NoisePacketReadWriter
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noise_state: NoiseState
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# NOTE: This prefix is added in msg#3 in Go.
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# Support in py-libp2p is available but not used
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prefix: bytes = b"\x00" * 32
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def __init__(self, conn: IRawConnection, noise_state: NoiseState) -> None:
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self.read_writer = NoisePacketReadWriter(cast(ReadWriteCloser, conn))
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self.noise_state = noise_state
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async def write_msg(self, msg: bytes, prefix_encoded: bool = False) -> None:
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data_encrypted = self.encrypt(msg)
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if prefix_encoded:
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# Manually add the prefix if needed
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data_encrypted = self.prefix + data_encrypted
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await self.read_writer.write_msg(data_encrypted)
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async def read_msg(self, prefix_encoded: bool = False) -> bytes:
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noise_msg_encrypted = await self.read_writer.read_msg()
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if prefix_encoded:
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return self.decrypt(noise_msg_encrypted[len(self.prefix) :])
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else:
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return self.decrypt(noise_msg_encrypted)
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async def close(self) -> None:
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await self.read_writer.close()
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def get_remote_address(self) -> tuple[str, int] | None:
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# Delegate to the underlying connection if possible
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if hasattr(self.read_writer, "read_write_closer") and hasattr(
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self.read_writer.read_write_closer,
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"get_remote_address",
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):
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return self.read_writer.read_write_closer.get_remote_address()
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return None
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class NoiseHandshakeReadWriter(BaseNoiseMsgReadWriter):
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def encrypt(self, data: bytes) -> bytes:
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return bytes(self.noise_state.write_message(data))
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def decrypt(self, data: bytes) -> bytes:
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return bytes(self.noise_state.read_message(data))
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class NoiseTransportReadWriter(BaseNoiseMsgReadWriter):
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def encrypt(self, data: bytes) -> bytes:
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return self.noise_state.encrypt(data)
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def decrypt(self, data: bytes) -> bytes:
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return self.noise_state.decrypt(data)
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