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| import re |
| from hashlib import blake2b |
| from math import ceil |
|
|
| from scalecodec.types import Bytes |
|
|
| RE_JUNCTION = r'(\/\/?)([^/]+)' |
| JUNCTION_ID_LEN = 32 |
|
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|
|
| class DeriveJunction: |
| def __init__(self, chain_code, is_hard=False): |
| self.chain_code = chain_code |
| self.is_hard = is_hard |
|
|
| @classmethod |
| def from_derive_path(cls, path: str, is_hard=False): |
|
|
| if path.isnumeric(): |
| byte_length = ceil(int(path).bit_length() / 8) |
| chain_code = int(path).to_bytes(byte_length, 'little').ljust(32, b'\x00') |
|
|
| else: |
| path_scale = Bytes() |
| path_scale.encode(path) |
|
|
| if len(path_scale.data) > JUNCTION_ID_LEN: |
| chain_code = blake2b(path_scale.data.data, digest_size=32).digest() |
| else: |
| chain_code = bytes(path_scale.data.data.ljust(32, b'\x00')) |
|
|
| return cls(chain_code=chain_code, is_hard=is_hard) |
|
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|
|
| def extract_derive_path(derive_path: str): |
|
|
| path_check = '' |
| junctions = [] |
| paths = re.findall(RE_JUNCTION, derive_path) |
|
|
| if paths: |
| path_check = ''.join(''.join(path) for path in paths) |
|
|
| for path_separator, path_value in paths: |
| junctions.append(DeriveJunction.from_derive_path( |
| path=path_value, is_hard=path_separator == '//') |
| ) |
|
|
| if path_check != derive_path: |
| raise ValueError('Reconstructed path "{}" does not match input'.format(path_check)) |
|
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| return junctions |
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