forked from LBRYCommunity/lbry-sdk
270 lines
10 KiB
Python
270 lines
10 KiB
Python
from typing import Dict
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from twisted.internet import defer
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from torba.mnemonic import Mnemonic
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from torba.bip32 import PrivateKey, PubKey, from_extended_key_string
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from torba.hash import double_sha256, aes_encrypt, aes_decrypt
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class KeyManager(object):
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__slots__ = 'account', 'public_key', 'chain_number'
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def __init__(self, account, public_key, chain_number):
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self.account = account
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self.public_key = public_key
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self.chain_number = chain_number
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@property
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def db(self):
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return self.account.ledger.db
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def _query_addresses(self, limit=None, max_used_times=None, order_by=None):
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return self.db.get_addresses(
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self.account, self.chain_number, limit, max_used_times, order_by
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)
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def ensure_address_gap(self): # type: () -> defer.Deferred
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raise NotImplementedError
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def get_address_records(self, limit=None, only_usable=False): # type: (int, bool) -> defer.Deferred
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raise NotImplementedError
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@defer.inlineCallbacks
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def get_addresses(self, limit=None, only_usable=False): # type: (int, bool) -> defer.Deferred
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records = yield self.get_address_records(limit=limit, only_usable=only_usable)
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defer.returnValue([r['address'] for r in records])
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@defer.inlineCallbacks
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def get_or_create_usable_address(self): # type: () -> defer.Deferred
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addresses = yield self.get_addresses(limit=1, only_usable=True)
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if addresses:
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defer.returnValue(addresses[0])
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addresses = yield self.ensure_address_gap()
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defer.returnValue(addresses[0])
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class KeyChain(KeyManager):
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""" Implements simple version of Bitcoin Hierarchical Deterministic key management. """
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__slots__ = 'gap', 'maximum_uses_per_address'
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def __init__(self, account, root_public_key, chain_number, gap, maximum_uses_per_address):
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# type: ('BaseAccount', PubKey, int, int, int) -> None
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super(KeyChain, self).__init__(account, root_public_key.child(chain_number), chain_number)
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self.gap = gap
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self.maximum_uses_per_address = maximum_uses_per_address
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@defer.inlineCallbacks
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def generate_keys(self, start, end):
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new_keys = []
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for index in range(start, end+1):
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new_keys.append((index, self.public_key.child(index)))
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yield self.db.add_keys(
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self.account, self.chain_number, new_keys
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)
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defer.returnValue([key[1].address for key in new_keys])
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@defer.inlineCallbacks
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def ensure_address_gap(self):
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addresses = yield self._query_addresses(self.gap, None, "position DESC")
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existing_gap = 0
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for address in addresses:
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if address['used_times'] == 0:
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existing_gap += 1
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else:
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break
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if existing_gap == self.gap:
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defer.returnValue([])
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start = addresses[0]['position']+1 if addresses else 0
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end = start + (self.gap - existing_gap)
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new_keys = yield self.generate_keys(start, end-1)
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defer.returnValue(new_keys)
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def get_address_records(self, limit=None, only_usable=False):
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return self._query_addresses(
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limit, self.maximum_uses_per_address if only_usable else None,
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"used_times ASC, position ASC"
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)
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class SingleKey(KeyManager):
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""" Single Key manager always returns the same address for all operations. """
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__slots__ = ()
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def __init__(self, account, root_public_key, chain_number):
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# type: ('BaseAccount', PubKey) -> None
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super(SingleKey, self).__init__(account, root_public_key, chain_number)
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@defer.inlineCallbacks
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def ensure_address_gap(self):
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exists = yield self.get_address_records()
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if not exists:
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yield self.db.add_keys(
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self.account, self.chain_number, [(0, self.public_key)]
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)
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defer.returnValue([self.public_key.address])
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defer.returnValue([])
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def get_address_records(self, **kwargs):
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return self._query_addresses()
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class BaseAccount(object):
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mnemonic_class = Mnemonic
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private_key_class = PrivateKey
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public_key_class = PubKey
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def __init__(self, ledger, name, seed, encrypted, is_hd, private_key,
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public_key, receiving_gap=20, change_gap=6,
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receiving_maximum_uses_per_address=2, change_maximum_uses_per_address=2):
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# type: (torba.baseledger.BaseLedger, str, str, bool, bool, PrivateKey, PubKey, int, int, int, int) -> None
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self.ledger = ledger
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self.name = name
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self.seed = seed
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self.encrypted = encrypted
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self.private_key = private_key
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self.public_key = public_key
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if is_hd:
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receiving, change = self.keychains = (
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KeyChain(self, public_key, 0, receiving_gap, receiving_maximum_uses_per_address),
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KeyChain(self, public_key, 1, change_gap, change_maximum_uses_per_address)
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)
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else:
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self.keychains = SingleKey(self, public_key, 0),
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receiving = change = self.keychains[0]
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self.receiving = receiving # type: KeyManager
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self.change = change # type: KeyManager
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ledger.add_account(self)
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@classmethod
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def generate(cls, ledger, password, **kwargs): # type: (torba.baseledger.BaseLedger, str) -> BaseAccount
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seed = cls.mnemonic_class().make_seed()
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return cls.from_seed(ledger, seed, password, **kwargs)
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@classmethod
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def from_seed(cls, ledger, seed, password, is_hd=True, **kwargs):
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# type: (torba.baseledger.BaseLedger, str, str) -> BaseAccount
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private_key = cls.get_private_key_from_seed(ledger, seed, password)
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return cls(
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ledger=ledger, name='Account #{}'.format(private_key.public_key.address),
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seed=seed, encrypted=False, is_hd=is_hd,
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private_key=private_key,
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public_key=private_key.public_key,
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**kwargs
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)
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@classmethod
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def get_private_key_from_seed(cls, ledger, seed, password):
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# type: (torba.baseledger.BaseLedger, str, str) -> PrivateKey
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return cls.private_key_class.from_seed(
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ledger, cls.mnemonic_class.mnemonic_to_seed(seed, password)
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)
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@classmethod
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def from_dict(cls, ledger, d): # type: (torba.baseledger.BaseLedger, Dict) -> BaseAccount
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if not d['encrypted'] and d['private_key']:
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private_key = from_extended_key_string(ledger, d['private_key'])
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public_key = private_key.public_key
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else:
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private_key = d['private_key']
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public_key = from_extended_key_string(ledger, d['public_key'])
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kwargs = dict(
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ledger=ledger,
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name=d['name'],
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seed=d['seed'],
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encrypted=d['encrypted'],
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private_key=private_key,
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public_key=public_key,
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is_hd=False
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)
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if d['is_hd']:
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kwargs.update(dict(
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receiving_gap=d['receiving_gap'],
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change_gap=d['change_gap'],
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receiving_maximum_uses_per_address=d['receiving_maximum_uses_per_address'],
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change_maximum_uses_per_address=d['change_maximum_uses_per_address'],
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is_hd=True
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))
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return cls(**kwargs)
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def to_dict(self):
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private_key = self.private_key
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if not self.encrypted and self.private_key:
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private_key = self.private_key.extended_key_string()
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d = {
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'ledger': self.ledger.get_id(),
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'name': self.name,
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'seed': self.seed,
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'encrypted': self.encrypted,
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'private_key': private_key,
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'public_key': self.public_key.extended_key_string(),
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'is_hd': False
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}
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if isinstance(self.receiving, KeyChain) and isinstance(self.change, KeyChain):
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d.update({
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'receiving_gap': self.receiving.gap,
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'change_gap': self.change.gap,
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'receiving_maximum_uses_per_address': self.receiving.maximum_uses_per_address,
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'change_maximum_uses_per_address': self.change.maximum_uses_per_address,
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'is_hd': True
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})
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return d
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def decrypt(self, password):
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assert self.encrypted, "Key is not encrypted."
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secret = double_sha256(password)
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self.seed = aes_decrypt(secret, self.seed)
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self.private_key = from_extended_key_string(self.ledger, aes_decrypt(secret, self.private_key))
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self.encrypted = False
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def encrypt(self, password):
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assert not self.encrypted, "Key is already encrypted."
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secret = double_sha256(password)
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self.seed = aes_encrypt(secret, self.seed)
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self.private_key = aes_encrypt(secret, self.private_key.extended_key_string())
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self.encrypted = True
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@defer.inlineCallbacks
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def ensure_address_gap(self):
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addresses = []
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for keychain in self.keychains:
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new_addresses = yield keychain.ensure_address_gap()
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addresses.extend(new_addresses)
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defer.returnValue(addresses)
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@defer.inlineCallbacks
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def get_addresses(self, limit=None, max_used_times=None): # type: (int, int) -> defer.Deferred
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records = yield self.get_address_records(limit, max_used_times)
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defer.returnValue([r['address'] for r in records])
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def get_address_records(self, limit=None, max_used_times=None): # type: (int, int) -> defer.Deferred
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return self.ledger.db.get_addresses(self, None, limit, max_used_times)
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def get_private_key(self, chain, index):
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assert not self.encrypted, "Cannot get private key on encrypted wallet account."
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if isinstance(self.receiving, SingleKey):
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return self.private_key
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else:
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return self.private_key.child(chain).child(index)
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def get_balance(self, confirmations=6, **constraints):
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if confirmations > 0:
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height = self.ledger.headers.height - (confirmations-1)
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constraints.update({'height__lte': height, 'height__not': -1})
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return self.ledger.db.get_balance_for_account(self, **constraints)
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def get_unspent_outputs(self, **constraints):
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return self.ledger.db.get_utxos_for_account(self, **constraints)
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