107 lines
2.9 KiB
Python
107 lines
2.9 KiB
Python
import hashlib
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from typing import Union
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import base58
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import multihash
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from libp2p.crypto.keys import PublicKey
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# NOTE: ``FRIENDLY_IDS`` renders a ``str`` representation of ``ID`` as a
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# short string of a prefix of the base58 representation. This feature is primarily
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# intended for debugging, logging, etc.
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FRIENDLY_IDS = True
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# NOTE: On inlining...
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# See: https://github.com/libp2p/specs/issues/138
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# NOTE: enabling to be interoperable w/ the Go implementation
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ENABLE_INLINING = True
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MAX_INLINE_KEY_LENGTH = 42
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IDENTITY_MULTIHASH_CODE = 0x00
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if ENABLE_INLINING:
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class IdentityHash:
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_digest: bytes
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def __init__(self) -> None:
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self._digest = bytearray()
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def update(self, input: bytes) -> None:
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self._digest += input
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def digest(self) -> bytes:
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return self._digest
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multihash.FuncReg.register(
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IDENTITY_MULTIHASH_CODE, "identity", hash_new=lambda: IdentityHash()
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)
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class ID:
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_bytes: bytes
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_xor_id: int = None
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_b58_str: str = None
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def __init__(self, peer_id_bytes: bytes) -> None:
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self._bytes = peer_id_bytes
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@property
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def xor_id(self) -> int:
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if not self._xor_id:
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self._xor_id = int(digest(self._bytes).hex(), 16)
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return self._xor_id
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def to_bytes(self) -> bytes:
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return self._bytes
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def to_base58(self) -> str:
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if not self._b58_str:
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self._b58_str = base58.b58encode(self._bytes).decode()
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return self._b58_str
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def __repr__(self) -> str:
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return "<libp2p.peer.id.ID 0x" + self._bytes.hex() + ">"
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pretty = to_string = to_base58
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def __str__(self) -> str:
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if FRIENDLY_IDS:
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return f"<peer.ID {self.to_string()[2:8]}>"
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else:
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return self.to_string()
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def __eq__(self, other: object) -> bool:
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if isinstance(other, str):
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return self.to_base58() == other
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elif isinstance(other, bytes):
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return self._bytes == other
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elif isinstance(other, ID):
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return self._bytes == other._bytes
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else:
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return NotImplemented
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def __hash__(self) -> int:
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return hash(self._bytes)
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@classmethod
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def from_base58(cls, b58_encoded_peer_id_str: str) -> "ID":
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peer_id_bytes = base58.b58decode(b58_encoded_peer_id_str)
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pid = ID(peer_id_bytes)
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return pid
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@classmethod
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def from_pubkey(cls, key: PublicKey) -> "ID":
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serialized_key = key.serialize()
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algo = multihash.Func.sha2_256
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if ENABLE_INLINING and len(serialized_key) <= MAX_INLINE_KEY_LENGTH:
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algo = IDENTITY_MULTIHASH_CODE
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mh_digest = multihash.digest(serialized_key, algo)
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return cls(mh_digest.encode())
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def digest(data: Union[str, bytes]) -> bytes:
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if isinstance(data, str):
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data = data.encode("utf8")
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return hashlib.sha1(data).digest()
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