forked from LBRYCommunity/lbry-sdk
363 lines
13 KiB
Python
363 lines
13 KiB
Python
import typing
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from typing import Dict, Tuple, Type, Optional, Any
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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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if typing.TYPE_CHECKING:
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from torba import baseledger
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from torba import wallet
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class AddressManager:
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name: str
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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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@classmethod
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def from_dict(cls, account: 'BaseAccount', d: dict) \
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-> Tuple['AddressManager', 'AddressManager']:
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raise NotImplementedError
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@classmethod
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def to_dict(cls, receiving: 'AddressManager', change: 'AddressManager') -> Dict:
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d: Dict[str, Any] = {'name': cls.name}
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receiving_dict = receiving.to_dict_instance()
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if receiving_dict:
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d['receiving'] = receiving_dict
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change_dict = change.to_dict_instance()
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if change_dict:
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d['change'] = change_dict
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return d
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def to_dict_instance(self) -> Optional[dict]:
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raise NotImplementedError
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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: int = None, max_used_times: int = 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 get_private_key(self, index: int) -> PrivateKey:
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raise NotImplementedError
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def get_max_gap(self) -> defer.Deferred:
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raise NotImplementedError
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def ensure_address_gap(self) -> defer.Deferred:
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raise NotImplementedError
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def get_address_records(self, limit: int = None, only_usable: bool = False) -> defer.Deferred:
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raise NotImplementedError
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@defer.inlineCallbacks
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def get_addresses(self, limit: int = None, only_usable: bool = False) -> 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) -> 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 HierarchicalDeterministic(AddressManager):
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""" Implements simple version of Bitcoin Hierarchical Deterministic key management. """
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name = "deterministic-chain"
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__slots__ = 'gap', 'maximum_uses_per_address'
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def __init__(self, account: 'BaseAccount', chain: int, gap: int, maximum_uses_per_address: int) -> None:
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super().__init__(account, account.public_key.child(chain), chain)
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self.gap = gap
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self.maximum_uses_per_address = maximum_uses_per_address
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@classmethod
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def from_dict(cls, account: 'BaseAccount', d: dict) -> Tuple[AddressManager, AddressManager]:
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return (
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cls(account, 0, **d.get('receiving', {'gap': 20, 'maximum_uses_per_address': 2})),
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cls(account, 1, **d.get('change', {'gap': 6, 'maximum_uses_per_address': 2}))
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)
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def to_dict_instance(self):
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return {'gap': self.gap, 'maximum_uses_per_address': self.maximum_uses_per_address}
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def get_private_key(self, index: int) -> PrivateKey:
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return self.account.private_key.child(self.chain_number).child(index)
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@defer.inlineCallbacks
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def generate_keys(self, start: int, end: int) -> defer.Deferred:
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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 get_max_gap(self) -> defer.Deferred:
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addresses = yield self._query_addresses(order_by="position ASC")
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max_gap = 0
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current_gap = 0
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for address in addresses:
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if address['used_times'] == 0:
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current_gap += 1
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else:
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max_gap = max(max_gap, current_gap)
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current_gap = 0
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defer.returnValue(max_gap)
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@defer.inlineCallbacks
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def ensure_address_gap(self) -> defer.Deferred:
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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: int = None, only_usable: bool = 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(AddressManager):
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""" Single Key address manager always returns the same address for all operations. """
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name = "single-address"
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__slots__ = ()
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@classmethod
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def from_dict(cls, account: 'BaseAccount', d: dict)\
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-> Tuple[AddressManager, AddressManager]:
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same_address_manager = cls(account, account.public_key, 0)
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return same_address_manager, same_address_manager
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def to_dict_instance(self):
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return None
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def get_private_key(self, index: int) -> PrivateKey:
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return self.account.private_key
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def get_max_gap(self) -> defer.Deferred:
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return defer.succeed(0)
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@defer.inlineCallbacks
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def ensure_address_gap(self) -> defer.Deferred:
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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, limit: int = None, only_usable: bool = False) -> defer.Deferred:
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return self._query_addresses()
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class BaseAccount:
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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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address_generators: Dict[str, Type[AddressManager]] = {
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SingleKey.name: SingleKey,
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HierarchicalDeterministic.name: HierarchicalDeterministic,
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}
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def __init__(self, ledger: 'baseledger.BaseLedger', wallet: 'wallet.Wallet', name: str,
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seed: str, encrypted: bool, private_key: PrivateKey, public_key: PubKey,
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address_generator: dict) -> None:
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self.ledger = ledger
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self.wallet = wallet
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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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generator_name = address_generator.get('name', HierarchicalDeterministic.name)
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self.address_generator = self.address_generators[generator_name]
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self.receiving, self.change = self.address_generator.from_dict(self, address_generator)
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self.address_managers = {self.receiving, self.change}
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ledger.add_account(self)
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wallet.add_account(self)
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@classmethod
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def generate(cls, ledger: 'baseledger.BaseLedger', wallet: 'wallet.Wallet',
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name: str = None, address_generator: dict = None):
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return cls.from_dict(ledger, wallet, {
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'name': name,
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'seed': cls.mnemonic_class().make_seed(),
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'address_generator': address_generator or {}
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})
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@classmethod
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def get_private_key_from_seed(cls, ledger: 'baseledger.BaseLedger', seed: str, password: str):
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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: 'baseledger.BaseLedger', wallet: 'wallet.Wallet', d: dict):
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seed = d.get('seed', '')
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private_key = d.get('private_key', '')
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public_key = None
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encrypted = d.get('encrypted', False)
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if not encrypted:
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if seed:
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private_key = cls.get_private_key_from_seed(ledger, seed, '')
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public_key = private_key.public_key
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elif private_key:
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private_key = from_extended_key_string(ledger, private_key)
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public_key = private_key.public_key
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if public_key is None:
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public_key = from_extended_key_string(ledger, d['public_key'])
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name = d.get('name')
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if not name:
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name = 'Account #{}'.format(public_key.address)
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return cls(
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ledger=ledger,
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wallet=wallet,
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name=name,
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seed=seed,
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encrypted=encrypted,
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private_key=private_key,
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public_key=public_key,
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address_generator=d.get('address_generator', {})
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)
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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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return {
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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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'address_generator': self.address_generator.to_dict(self.receiving, self.change)
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}
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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 address_manager in self.address_managers:
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new_addresses = yield address_manager.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: int = None, max_used_times: int = None) -> 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: int = None, max_used_times: int = None) -> 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: int, index: int) -> PrivateKey:
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assert not self.encrypted, "Cannot get private key on encrypted wallet account."
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address_manager = {0: self.receiving, 1: self.change}[chain]
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return address_manager.get_private_key(index)
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def get_balance(self, confirmations: int = 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__gt': 0})
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return self.ledger.db.get_balance_for_account(self, **constraints)
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@defer.inlineCallbacks
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def get_max_gap(self):
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change_gap = yield self.change.get_max_gap()
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receiving_gap = yield self.receiving.get_max_gap()
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defer.returnValue({
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'max_change_gap': change_gap,
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'max_receiving_gap': receiving_gap,
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})
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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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@defer.inlineCallbacks
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def fund(self, to_account, amount=None, everything=False,
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outputs=1, broadcast=False, **constraints):
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assert self.ledger == to_account.ledger, 'Can only transfer between accounts of the same ledger.'
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tx_class = self.ledger.transaction_class
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if everything:
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utxos = yield self.get_unspent_outputs(**constraints)
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yield self.ledger.reserve_outputs(utxos)
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tx = yield tx_class.create(
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inputs=[tx_class.input_class.spend(txo) for txo in utxos],
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outputs=[],
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funding_accounts=[self],
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change_account=to_account
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)
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elif amount > 0:
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to_address = yield to_account.change.get_or_create_usable_address()
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to_hash160 = to_account.ledger.address_to_hash160(to_address)
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tx = yield tx_class.create(
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inputs=[],
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outputs=[
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tx_class.output_class.pay_pubkey_hash(amount//outputs, to_hash160)
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for _ in range(outputs)
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],
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funding_accounts=[self],
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change_account=self
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)
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else:
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raise ValueError('An amount is required.')
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if broadcast:
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yield self.ledger.broadcast(tx)
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else:
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yield self.ledger.release_outputs(
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[txi.txo_ref.txo for txi in tx.inputs]
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)
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defer.returnValue(tx)
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