# Copyright (c) 2026 Emanuele Bellocchia
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# THE SOFTWARE.
"""Module for Icon address encoding/decoding."""
# Imports
from typing import Any, Union
from typing_extensions import override
from bip_utils.addr.addr_dec_utils import AddrDecUtils
from bip_utils.addr.addr_key_validator import AddrKeyValidator
from bip_utils.addr.iaddr_decoder import IAddrDecoder
from bip_utils.addr.iaddr_encoder import IAddrEncoder
from bip_utils.coin_conf import CoinsConf
from bip_utils.ecc import IPublicKey
from bip_utils.utils.crypto import Sha3_256
from bip_utils.utils.misc import BytesUtils
class IcxAddrConst:
"""Class container for Icon address constants."""
# Key hash length in bytes
KEY_HASH_BYTE_LEN: int = 20
class IcxAddrDecoder(IAddrDecoder):
"""
Icon address decoder class.
It allows the Icon address decoding.
"""
@override
@staticmethod
def DecodeAddr(addr: str,
**kwargs: Any) -> bytes:
"""
Decode an Icon address to bytes.
Args:
addr (str): Address string
**kwargs : Not used
Returns:
bytes: Public key hash bytes
Raises:
ValueError: If the address encoding is not valid
"""
# Validate and remove prefix
addr_no_prefix = AddrDecUtils.ValidateAndRemovePrefix(addr,
CoinsConf.Icon.ParamByKey("addr_prefix"))
# Validate length
pub_key_hash_bytes = BytesUtils.FromHexString(addr_no_prefix)
AddrDecUtils.ValidateLength(pub_key_hash_bytes, IcxAddrConst.KEY_HASH_BYTE_LEN)
return pub_key_hash_bytes
class IcxAddrEncoder(IAddrEncoder):
"""
Icon address encoder class.
It allows the Icon address encoding.
"""
@override
@staticmethod
def EncodeKey(pub_key: Union[bytes, IPublicKey],
**kwargs: Any) -> str:
"""
Encode a public key to Icon address.
Args:
pub_key (bytes or IPublicKey): Public key bytes or object
**kwargs : Not used
Returns:
str: Address string
Raises:
ValueError: If the public key is not valid
TypeError: If the public key is not secp256k1
"""
pub_key_obj = AddrKeyValidator.ValidateAndGetSecp256k1Key(pub_key)
pub_key_hash_bytes = Sha3_256.QuickDigest(
pub_key_obj.RawUncompressed().ToBytes()[1:]
)[-IcxAddrConst.KEY_HASH_BYTE_LEN:]
return CoinsConf.Icon.ParamByKey("addr_prefix") + BytesUtils.ToHexString(pub_key_hash_bytes)
# Deprecated: only for compatibility, Encoder class shall be used instead
IcxAddr = IcxAddrEncoder