forked from LBRYCommunity/lbry-sdk
184 lines
6.6 KiB
Python
184 lines
6.6 KiB
Python
from typing import Dict
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from binascii import unhexlify
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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 KeyChain:
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def __init__(self, account, parent_key, chain_number, minimum_usable_addresses):
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self.account = account
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self.db = account.ledger.db
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self.main_key = parent_key.child(chain_number) # type: PubKey
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self.chain_number = chain_number
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self.minimum_usable_addresses = minimum_usable_addresses
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def get_keys(self):
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return self.db.get_keys(self.account, self.chain_number)
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def get_addresses(self):
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return self.db.get_addresses(self.account, self.chain_number)
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@defer.inlineCallbacks
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def ensure_enough_useable_addresses(self):
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usable_address_count = yield self.db.get_usable_address_count(
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self.account, self.chain_number
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)
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if usable_address_count >= self.minimum_usable_addresses:
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defer.returnValue([])
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new_addresses_needed = self.minimum_usable_addresses - usable_address_count
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start = yield self.db.get_last_address_index(
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self.account, self.chain_number
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)
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end = start + new_addresses_needed
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new_keys = []
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for index in range(start+1, end+1):
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new_keys.append((index, self.main_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([
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key[1].address for key in new_keys
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])
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@defer.inlineCallbacks
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def has_gap(self):
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if len(self.addresses) < self.minimum_gap:
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defer.returnValue(False)
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for address in self.addresses[-self.minimum_gap:]:
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if (yield self.ledger.is_address_old(address)):
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defer.returnValue(False)
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defer.returnValue(True)
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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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def __init__(self, ledger, seed, encrypted, private_key,
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public_key, receiving_gap=20, change_gap=6):
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self.ledger = ledger # type: baseledger.BaseLedger
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self.seed = seed # type: str
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self.encrypted = encrypted # type: bool
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self.private_key = private_key # type: PrivateKey
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self.public_key = public_key # type: PubKey
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self.receiving, self.change = self.keychains = (
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KeyChain(self, public_key, 0, receiving_gap),
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KeyChain(self, public_key, 1, change_gap)
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)
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ledger.account_created(self)
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@classmethod
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def generate(cls, ledger, password): # type: (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)
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@classmethod
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def from_seed(cls, ledger, seed, password):
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# type: (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, seed=seed, encrypted=False,
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private_key=private_key,
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public_key=private_key.public_key
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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: (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: (baseledger.BaseLedger, Dict) -> BaseAccount
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if not d['encrypted']:
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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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return cls(
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ledger=ledger,
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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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receiving_gap=d['receiving_gap'],
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change_gap=d['change_gap']
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)
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def to_dict(self):
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return {
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'ledger': self.ledger.get_id(),
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'seed': self.seed,
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'encrypted': self.encrypted,
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'private_key': self.private_key if self.encrypted else
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self.private_key.extended_key_string(),
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'public_key': self.public_key.extended_key_string(),
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'receiving_gap': self.receiving.minimum_usable_addresses,
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'change_gap': self.change.minimum_usable_addresses,
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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_enough_useable_addresses(self):
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addresses = []
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for keychain in self.keychains:
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new_addresses = yield keychain.ensure_enough_useable_addresses()
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addresses.extend(new_addresses)
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defer.returnValue(addresses)
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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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return self.private_key.child(chain).child(index)
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def get_least_used_receiving_address(self, max_transactions=1000):
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return self._get_least_used_address(
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self.receiving_keys,
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max_transactions
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)
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def get_least_used_change_address(self, max_transactions=100):
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return self._get_least_used_address(
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self.change_keys,
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max_transactions
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)
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def _get_least_used_address(self, keychain, max_transactions):
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ledger = self.ledger
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address = ledger.get_least_used_address(self, keychain, max_transactions)
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if address:
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return address
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address = keychain.generate_next_address()
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ledger.subscribe_history(address)
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return address
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@defer.inlineCallbacks
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def get_balance(self):
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utxos = yield self.ledger.get_unspent_outputs(self)
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defer.returnValue(sum(utxo.amount for utxo in utxos))
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