lbry-sdk/lbry/wallet/account.py

660 lines
26 KiB
Python
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import os
import time
import json
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import logging
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import typing
import asyncio
import random
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from hashlib import sha256
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from string import hexdigits
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from typing import Type, Dict, Tuple, Optional, Any, List
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from lbry.error import InvalidPasswordError
from lbry.crypto.crypt import aes_encrypt, aes_decrypt
from .bip32 import PrivateKey, PublicKey, KeyPath, from_extended_key_string
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from .mnemonic import Mnemonic
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from .constants import COIN, TXO_TYPES
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from .transaction import Transaction, Input, Output
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if typing.TYPE_CHECKING:
from .ledger import Ledger
from .wallet import Wallet
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log = logging.getLogger(__name__)
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def validate_claim_id(claim_id):
if not len(claim_id) == 40:
raise Exception("Incorrect claimid length: %i" % len(claim_id))
if isinstance(claim_id, bytes):
claim_id = claim_id.decode('utf-8')
if set(claim_id).difference(hexdigits):
raise Exception("Claim id is not hex encoded")
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class DeterministicChannelKeyManager:
def __init__(self, account: 'Account'):
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self.account = account
self.last_known = 0
self.cache = {}
self._private_key: Optional[PrivateKey] = None
@property
def private_key(self):
if self._private_key is None:
if self.account.private_key is not None:
self._private_key = self.account.private_key.child(KeyPath.CHANNEL)
return self._private_key
def maybe_generate_deterministic_key_for_channel(self, txo):
if self.private_key is None:
return
next_private_key = self.private_key.child(self.last_known)
public_key = next_private_key.public_key
public_key_bytes = public_key.pubkey_bytes
if txo.claim.channel.public_key_bytes == public_key_bytes:
self.cache[public_key.address] = next_private_key
self.last_known += 1
async def ensure_cache_primed(self):
if self.private_key is not None:
await self.generate_next_key()
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async def generate_next_key(self) -> PrivateKey:
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db = self.account.ledger.db
while True:
next_private_key = self.private_key.child(self.last_known)
public_key = next_private_key.public_key
self.cache[public_key.address] = next_private_key
if not await db.is_channel_key_used(self.account, public_key):
return next_private_key
self.last_known += 1
def get_private_key_from_pubkey_hash(self, pubkey_hash) -> PrivateKey:
return self.cache.get(pubkey_hash)
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class AddressManager:
name: str
__slots__ = 'account', 'public_key', 'chain_number', 'address_generator_lock'
def __init__(self, account, public_key, chain_number):
self.account = account
self.public_key = public_key
self.chain_number = chain_number
self.address_generator_lock = asyncio.Lock()
@classmethod
def from_dict(cls, account: 'Account', d: dict) \
-> Tuple['AddressManager', 'AddressManager']:
raise NotImplementedError
@classmethod
def to_dict(cls, receiving: 'AddressManager', change: 'AddressManager') -> Dict:
d: Dict[str, Any] = {'name': cls.name}
receiving_dict = receiving.to_dict_instance()
if receiving_dict:
d['receiving'] = receiving_dict
change_dict = change.to_dict_instance()
if change_dict:
d['change'] = change_dict
return d
def merge(self, d: dict):
pass
def to_dict_instance(self) -> Optional[dict]:
raise NotImplementedError
def _query_addresses(self, **constraints):
return self.account.ledger.db.get_addresses(
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read_only=constraints.pop("read_only", False),
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accounts=[self.account],
chain=self.chain_number,
**constraints
)
def get_private_key(self, index: int) -> PrivateKey:
raise NotImplementedError
def get_public_key(self, index: int) -> PublicKey:
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raise NotImplementedError
async def get_max_gap(self):
raise NotImplementedError
async def ensure_address_gap(self):
raise NotImplementedError
def get_address_records(self, only_usable: bool = False, **constraints):
raise NotImplementedError
async def get_addresses(self, only_usable: bool = False, **constraints) -> List[str]:
records = await self.get_address_records(only_usable=only_usable, **constraints)
return [r['address'] for r in records]
async def get_or_create_usable_address(self) -> str:
async with self.address_generator_lock:
addresses = await self.get_addresses(only_usable=True, limit=10)
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if addresses:
return random.choice(addresses)
addresses = await self.ensure_address_gap()
return addresses[0]
class HierarchicalDeterministic(AddressManager):
""" Implements simple version of Bitcoin Hierarchical Deterministic key management. """
name: str = "deterministic-chain"
__slots__ = 'gap', 'maximum_uses_per_address'
def __init__(self, account: 'Account', chain: int, gap: int, maximum_uses_per_address: int) -> None:
super().__init__(account, account.public_key.child(chain), chain)
self.gap = gap
self.maximum_uses_per_address = maximum_uses_per_address
@classmethod
def from_dict(cls, account: 'Account', d: dict) -> Tuple[AddressManager, AddressManager]:
return (
cls(account, KeyPath.RECEIVE, **d.get('receiving', {'gap': 20, 'maximum_uses_per_address': 1})),
cls(account, KeyPath.CHANGE, **d.get('change', {'gap': 6, 'maximum_uses_per_address': 1}))
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)
def merge(self, d: dict):
self.gap = d.get('gap', self.gap)
self.maximum_uses_per_address = d.get('maximum_uses_per_address', self.maximum_uses_per_address)
def to_dict_instance(self):
return {'gap': self.gap, 'maximum_uses_per_address': self.maximum_uses_per_address}
def get_private_key(self, index: int) -> PrivateKey:
return self.account.private_key.child(self.chain_number).child(index)
def get_public_key(self, index: int) -> PublicKey:
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return self.account.public_key.child(self.chain_number).child(index)
async def get_max_gap(self) -> int:
addresses = await self._query_addresses(order_by="n asc")
max_gap = 0
current_gap = 0
for address in addresses:
if address['used_times'] == 0:
current_gap += 1
else:
max_gap = max(max_gap, current_gap)
current_gap = 0
return max_gap
async def ensure_address_gap(self) -> List[str]:
async with self.address_generator_lock:
addresses = await self._query_addresses(limit=self.gap, order_by="n desc")
existing_gap = 0
for address in addresses:
if address['used_times'] == 0:
existing_gap += 1
else:
break
if existing_gap == self.gap:
return []
start = addresses[0]['pubkey'].n+1 if addresses else 0
end = start + (self.gap - existing_gap)
new_keys = await self._generate_keys(start, end-1)
await self.account.ledger.announce_addresses(self, new_keys)
return new_keys
async def _generate_keys(self, start: int, end: int) -> List[str]:
if not self.address_generator_lock.locked():
raise RuntimeError('Should not be called outside of address_generator_lock.')
keys = [self.public_key.child(index) for index in range(start, end+1)]
await self.account.ledger.db.add_keys(self.account, self.chain_number, keys)
return [key.address for key in keys]
def get_address_records(self, only_usable: bool = False, **constraints):
if only_usable:
constraints['used_times__lt'] = self.maximum_uses_per_address
if 'order_by' not in constraints:
constraints['order_by'] = "used_times asc, n asc"
return self._query_addresses(**constraints)
class SingleKey(AddressManager):
""" Single Key address manager always returns the same address for all operations. """
name: str = "single-address"
__slots__ = ()
@classmethod
def from_dict(cls, account: 'Account', d: dict) \
-> Tuple[AddressManager, AddressManager]:
same_address_manager = cls(account, account.public_key, KeyPath.RECEIVE)
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return same_address_manager, same_address_manager
def to_dict_instance(self):
return None
def get_private_key(self, index: int) -> PrivateKey:
return self.account.private_key
def get_public_key(self, index: int) -> PublicKey:
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return self.account.public_key
async def get_max_gap(self) -> int:
return 0
async def ensure_address_gap(self) -> List[str]:
async with self.address_generator_lock:
exists = await self.get_address_records()
if not exists:
await self.account.ledger.db.add_keys(self.account, self.chain_number, [self.public_key])
new_keys = [self.public_key.address]
await self.account.ledger.announce_addresses(self, new_keys)
return new_keys
return []
def get_address_records(self, only_usable: bool = False, **constraints):
return self._query_addresses(**constraints)
class Account:
address_generators: Dict[str, Type[AddressManager]] = {
SingleKey.name: SingleKey,
HierarchicalDeterministic.name: HierarchicalDeterministic,
}
def __init__(self, ledger: 'Ledger', wallet: 'Wallet', name: str,
seed: str, private_key_string: str, encrypted: bool,
private_key: Optional[PrivateKey], public_key: PublicKey,
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address_generator: dict, modified_on: float, channel_keys: dict) -> None:
self.ledger = ledger
self.wallet = wallet
self.id = public_key.address
self.name = name
self.seed = seed
self.modified_on = modified_on
self.private_key_string = private_key_string
self.init_vectors: Dict[str, bytes] = {}
self.encrypted = encrypted
self.private_key: Optional[PrivateKey] = private_key
self.public_key: PublicKey = public_key
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generator_name = address_generator.get('name', HierarchicalDeterministic.name)
self.address_generator = self.address_generators[generator_name]
self.receiving, self.change = self.address_generator.from_dict(self, address_generator)
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self.address_managers = {am.chain_number: am for am in (self.receiving, self.change)}
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self.channel_keys = channel_keys
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self.deterministic_channel_keys = DeterministicChannelKeyManager(self)
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ledger.add_account(self)
wallet.add_account(self)
def get_init_vector(self, key) -> Optional[bytes]:
init_vector = self.init_vectors.get(key, None)
if init_vector is None:
init_vector = self.init_vectors[key] = os.urandom(16)
return init_vector
@classmethod
def generate(cls, ledger: 'Ledger', wallet: 'Wallet',
name: str = None, address_generator: dict = None):
return cls.from_dict(ledger, wallet, {
'name': name,
'seed': Mnemonic().make_seed(),
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'address_generator': address_generator or {}
})
@classmethod
def get_private_key_from_seed(cls, ledger: 'Ledger', seed: str, password: str):
return PrivateKey.from_seed(
ledger, Mnemonic.mnemonic_to_seed(seed, password or 'lbryum')
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)
@classmethod
def keys_from_dict(cls, ledger: 'Ledger', d: dict) \
-> Tuple[str, Optional[PrivateKey], PublicKey]:
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seed = d.get('seed', '')
private_key_string = d.get('private_key', '')
private_key = None
public_key = None
encrypted = d.get('encrypted', False)
if not encrypted:
if seed:
private_key = cls.get_private_key_from_seed(ledger, seed, '')
public_key = private_key.public_key
elif private_key_string:
private_key = from_extended_key_string(ledger, private_key_string)
public_key = private_key.public_key
if public_key is None:
public_key = from_extended_key_string(ledger, d['public_key'])
return seed, private_key, public_key
@classmethod
def from_dict(cls, ledger: 'Ledger', wallet: 'Wallet', d: dict):
seed, private_key, public_key = cls.keys_from_dict(ledger, d)
name = d.get('name')
if not name:
name = f'Account #{public_key.address}'
return cls(
ledger=ledger,
wallet=wallet,
name=name,
seed=seed,
private_key_string=d.get('private_key', ''),
encrypted=d.get('encrypted', False),
private_key=private_key,
public_key=public_key,
address_generator=d.get('address_generator', {}),
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modified_on=int(d.get('modified_on', time.time())),
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channel_keys=d.get('certificates', {})
)
def to_dict(self, encrypt_password: str = None, include_channel_keys: bool = True):
private_key_string, seed = self.private_key_string, self.seed
if not self.encrypted and self.private_key:
private_key_string = self.private_key.extended_key_string()
if not self.encrypted and encrypt_password:
if private_key_string:
private_key_string = aes_encrypt(
encrypt_password, private_key_string, self.get_init_vector('private_key')
)
if seed:
seed = aes_encrypt(encrypt_password, self.seed, self.get_init_vector('seed'))
d = {
'ledger': self.ledger.get_id(),
'name': self.name,
'seed': seed,
'encrypted': bool(self.encrypted or encrypt_password),
'private_key': private_key_string,
'public_key': self.public_key.extended_key_string(),
'address_generator': self.address_generator.to_dict(self.receiving, self.change),
'modified_on': self.modified_on
}
if include_channel_keys:
d['certificates'] = self.channel_keys
return d
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def merge(self, d: dict):
if d.get('modified_on', 0) > self.modified_on:
self.name = d['name']
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self.modified_on = int(d.get('modified_on', time.time()))
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assert self.address_generator.name == d['address_generator']['name']
for chain_name in ('change', 'receiving'):
if chain_name in d['address_generator']:
chain_object = getattr(self, chain_name)
chain_object.merge(d['address_generator'][chain_name])
self.channel_keys.update(d.get('certificates', {}))
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@property
def hash(self) -> bytes:
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assert not self.encrypted, "Cannot hash an encrypted account."
h = sha256(json.dumps(self.to_dict(include_channel_keys=False)).encode())
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for cert in sorted(self.channel_keys.keys()):
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h.update(cert.encode())
return h.digest()
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async def get_details(self, show_seed=False, **kwargs):
satoshis = await self.get_balance(**kwargs)
details = {
'id': self.id,
'name': self.name,
'ledger': self.ledger.get_id(),
'coins': round(satoshis/COIN, 2),
'satoshis': satoshis,
'encrypted': self.encrypted,
'public_key': self.public_key.extended_key_string(),
'address_generator': self.address_generator.to_dict(self.receiving, self.change)
}
if show_seed:
details['seed'] = self.seed
details['certificates'] = len(self.channel_keys)
return details
def decrypt(self, password: str) -> bool:
assert self.encrypted, "Key is not encrypted."
try:
seed = self._decrypt_seed(password)
except (ValueError, InvalidPasswordError):
return False
try:
private_key = self._decrypt_private_key_string(password)
except (TypeError, ValueError, InvalidPasswordError):
return False
self.seed = seed
self.private_key = private_key
self.private_key_string = ""
self.encrypted = False
return True
def _decrypt_private_key_string(self, password: str) -> Optional[PrivateKey]:
if not self.private_key_string:
return None
private_key_string, self.init_vectors['private_key'] = aes_decrypt(password, self.private_key_string)
if not private_key_string:
return None
return from_extended_key_string(
self.ledger, private_key_string
)
def _decrypt_seed(self, password: str) -> str:
if not self.seed:
return ""
seed, self.init_vectors['seed'] = aes_decrypt(password, self.seed)
if not seed:
return ""
try:
Mnemonic().mnemonic_decode(seed)
except IndexError:
# failed to decode the seed, this either means it decrypted and is invalid
# or that we hit an edge case where an incorrect password gave valid padding
raise ValueError("Failed to decode seed.")
return seed
def encrypt(self, password: str) -> bool:
assert not self.encrypted, "Key is already encrypted."
if self.seed:
self.seed = aes_encrypt(password, self.seed, self.get_init_vector('seed'))
if isinstance(self.private_key, PrivateKey):
self.private_key_string = aes_encrypt(
password, self.private_key.extended_key_string(), self.get_init_vector('private_key')
)
self.private_key = None
self.encrypted = True
return True
async def ensure_address_gap(self):
addresses = []
for address_manager in self.address_managers.values():
new_addresses = await address_manager.ensure_address_gap()
addresses.extend(new_addresses)
return addresses
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async def get_addresses(self, read_only=False, **constraints) -> List[str]:
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rows = await self.ledger.db.select_addresses('address', read_only=read_only, accounts=[self], **constraints)
return [r['address'] for r in rows]
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def get_address_records(self, **constraints):
return self.ledger.db.get_addresses(accounts=[self], **constraints)
def get_address_count(self, **constraints):
return self.ledger.db.get_address_count(accounts=[self], **constraints)
def get_private_key(self, chain: int, index: int) -> PrivateKey:
assert not self.encrypted, "Cannot get private key on encrypted wallet account."
return self.address_managers[chain].get_private_key(index)
def get_public_key(self, chain: int, index: int) -> PublicKey:
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return self.address_managers[chain].get_public_key(index)
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def get_balance(self, confirmations=0, include_claims=False, read_only=False, **constraints):
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if not include_claims:
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constraints.update({'txo_type__in': (TXO_TYPES['other'], TXO_TYPES['purchase'])})
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if confirmations > 0:
height = self.ledger.headers.height - (confirmations-1)
constraints.update({'height__lte': height, 'height__gt': 0})
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return self.ledger.db.get_balance(accounts=[self], read_only=read_only, **constraints)
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async def get_max_gap(self):
change_gap = await self.change.get_max_gap()
receiving_gap = await self.receiving.get_max_gap()
return {
'max_change_gap': change_gap,
'max_receiving_gap': receiving_gap,
}
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def get_txos(self, **constraints):
return self.ledger.get_txos(wallet=self.wallet, accounts=[self], **constraints)
def get_txo_count(self, **constraints):
return self.ledger.get_txo_count(wallet=self.wallet, accounts=[self], **constraints)
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def get_utxos(self, **constraints):
return self.ledger.get_utxos(wallet=self.wallet, accounts=[self], **constraints)
def get_utxo_count(self, **constraints):
return self.ledger.get_utxo_count(wallet=self.wallet, accounts=[self], **constraints)
def get_transactions(self, **constraints):
return self.ledger.get_transactions(wallet=self.wallet, accounts=[self], **constraints)
def get_transaction_count(self, **constraints):
return self.ledger.get_transaction_count(wallet=self.wallet, accounts=[self], **constraints)
async def fund(self, to_account, amount=None, everything=False,
outputs=1, broadcast=False, **constraints):
assert self.ledger == to_account.ledger, 'Can only transfer between accounts of the same ledger.'
if everything:
utxos = await self.get_utxos(**constraints)
await self.ledger.reserve_outputs(utxos)
tx = await Transaction.create(
inputs=[Input.spend(txo) for txo in utxos],
outputs=[],
funding_accounts=[self],
change_account=to_account
)
elif amount > 0:
to_address = await to_account.change.get_or_create_usable_address()
to_hash160 = to_account.ledger.address_to_hash160(to_address)
tx = await Transaction.create(
inputs=[],
outputs=[
Output.pay_pubkey_hash(amount//outputs, to_hash160)
for _ in range(outputs)
],
funding_accounts=[self],
change_account=self
)
else:
raise ValueError('An amount is required.')
if broadcast:
await self.ledger.broadcast(tx)
else:
await self.ledger.release_tx(tx)
return tx
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async def generate_channel_private_key(self):
return await self.deterministic_channel_keys.generate_next_key()
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def add_channel_private_key(self, private_key: PrivateKey):
self.channel_keys[private_key.address] = private_key.to_pem().decode()
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async def get_channel_private_key(self, public_key_bytes) -> PrivateKey:
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channel_pubkey_hash = self.ledger.public_key_to_address(public_key_bytes)
private_key_pem = self.channel_keys.get(channel_pubkey_hash)
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if private_key_pem:
return PrivateKey.from_pem(self.ledger, private_key_pem)
return self.deterministic_channel_keys.get_private_key_from_pubkey_hash(channel_pubkey_hash)
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async def maybe_migrate_certificates(self):
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if not self.channel_keys:
return
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channel_keys = {}
for private_key_pem in self.channel_keys.values():
if not isinstance(private_key_pem, str):
continue
if not private_key_pem.startswith("-----BEGIN"):
continue
private_key = PrivateKey.from_pem(self.ledger, private_key_pem)
channel_keys[private_key.address] = private_key_pem
if self.channel_keys != channel_keys:
self.channel_keys = channel_keys
self.wallet.save()
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async def save_max_gap(self):
if issubclass(self.address_generator, HierarchicalDeterministic):
gap = await self.get_max_gap()
gap_changed = False
new_receiving_gap = max(20, gap['max_receiving_gap'] + 1)
if self.receiving.gap != new_receiving_gap:
self.receiving.gap = new_receiving_gap
gap_changed = True
new_change_gap = max(6, gap['max_change_gap'] + 1)
if self.change.gap != new_change_gap:
self.change.gap = new_change_gap
gap_changed = True
if gap_changed:
self.wallet.save()
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async def get_detailed_balance(self, confirmations=0, read_only=False):
constraints = {}
if confirmations > 0:
height = self.ledger.headers.height - (confirmations-1)
constraints.update({'height__lte': height, 'height__gt': 0})
return await self.ledger.db.get_detailed_balance(
accounts=[self], read_only=read_only, **constraints
)
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def get_transaction_history(self, read_only=False, **constraints):
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return self.ledger.get_transaction_history(
read_only=read_only, wallet=self.wallet, accounts=[self], **constraints
)
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def get_transaction_history_count(self, read_only=False, **constraints):
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return self.ledger.get_transaction_history_count(
read_only=read_only, wallet=self.wallet, accounts=[self], **constraints
)
def get_claims(self, **constraints):
return self.ledger.get_claims(wallet=self.wallet, accounts=[self], **constraints)
def get_claim_count(self, **constraints):
return self.ledger.get_claim_count(wallet=self.wallet, accounts=[self], **constraints)
def get_streams(self, **constraints):
return self.ledger.get_streams(wallet=self.wallet, accounts=[self], **constraints)
def get_stream_count(self, **constraints):
return self.ledger.get_stream_count(wallet=self.wallet, accounts=[self], **constraints)
def get_channels(self, **constraints):
return self.ledger.get_channels(wallet=self.wallet, accounts=[self], **constraints)
def get_channel_count(self, **constraints):
return self.ledger.get_channel_count(wallet=self.wallet, accounts=[self], **constraints)
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def get_collections(self, **constraints):
return self.ledger.get_collections(wallet=self.wallet, accounts=[self], **constraints)
def get_collection_count(self, **constraints):
return self.ledger.get_collection_count(wallet=self.wallet, accounts=[self], **constraints)
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def get_supports(self, **constraints):
return self.ledger.get_supports(wallet=self.wallet, accounts=[self], **constraints)
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def get_support_count(self, **constraints):
return self.ledger.get_support_count(wallet=self.wallet, accounts=[self], **constraints)
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def get_support_summary(self):
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return self.ledger.db.get_supports_summary(wallet=self.wallet, accounts=[self])
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async def release_all_outputs(self):
await self.ledger.db.release_all_outputs(self)