chia-blockchain/tests/wallet_tools.py

from typing import List, Optional, Dict

import clvm
from os import urandom
from blspy import ExtendedPrivateKey

from src.types.hashable import ProgramHash, CoinSolution, SpendBundle, Program, BLSSignature, Coin
from src.util.Conditions import conditions_by_opcode, ConditionVarPair, ConditionOpcode
from src.util.consensus import hash_key_pairs_for_conditions_dict, conditions_for_solution
from src.wallet import keychain
from src.wallet.BLSPrivateKey import BLSPrivateKey
from src.wallet.puzzles.p2_conditions import puzzle_for_conditions
from src.wallet.puzzles.p2_delegated_conditions import solution_for_conditions
from src.wallet.puzzles.p2_delegated_puzzle import puzzle_for_pk
from src.wallet.puzzles.puzzle_utils import make_assert_coin_consumed_condition, make_assert_min_time_condition, \
    make_assert_my_coin_id_condition, make_create_coin_condition, make_assert_block_index_exceeds_condition, \
    make_assert_block_age_exceeds_condition, make_assert_aggsig_condition


class WalletTool:
    seed = b'seed'
    next_address = 0
    pubkey_num_lookup = {}

    def __init__(self):
        self.current_balance = 0
        self.my_utxos = set()
        self.seed = urandom(1024)
        self.extended_secret_key = ExtendedPrivateKey.from_seed(self.seed)
        self.generator_lookups = {}
        self.name = "MyChiaWallet"

    def get_next_public_key(self):
        pubkey = self.extended_secret_key.public_child(
            self.next_address).get_public_key()
        self.pubkey_num_lookup[pubkey.serialize()] = self.next_address
        self.next_address = self.next_address + 1
        return pubkey

    def set_name(self, name):
        self.name = name

    def can_generate_puzzle_hash(self, hash):
        return any(map(lambda child: hash == ProgramHash(puzzle_for_pk(
            self.extended_secret_key.public_child(child).get_public_key().serialize())),
            reversed(range(self.next_address))))

    def get_keys(self, hash):
        for child in range(self.next_address):
            pubkey = self.extended_secret_key.public_child(
                child).get_public_key()
            if hash == ProgramHash(puzzle_for_pk(pubkey.serialize())):
                return (pubkey, self.extended_secret_key.private_child(child).get_private_key())

    def puzzle_for_pk(self, pubkey):
        return puzzle_for_pk(pubkey)

    def get_new_puzzle(self):
        pubkey = self.get_next_public_key().serialize()
        puzzle = puzzle_for_pk(pubkey)
        return puzzle

    def get_new_puzzlehash(self):
        puzzle = self.get_new_puzzle()
        puzzlehash = ProgramHash(puzzle)
        return puzzlehash

    def sign(self, value, pubkey):
        privatekey = self.extended_secret_key.private_child(
            self.pubkey_num_lookup[pubkey]).get_private_key()
        blskey = BLSPrivateKey(privatekey)
        return blskey.sign(value)

    def make_solution(self, condition_dic: Dict[ConditionOpcode, List[ConditionVarPair]]):
        ret = []

        for con_list in condition_dic.values():
            for cvp in con_list:
                if cvp.opcode == ConditionOpcode.CREATE_COIN:
                    ret.append(make_create_coin_condition(cvp.var1, cvp.var2))
                if cvp.opcode == ConditionOpcode.AGG_SIG:
                    ret.append(make_assert_aggsig_condition(cvp.var1))
                if cvp.opcode == ConditionOpcode.ASSERT_COIN_CONSUMED:
                    ret.append(make_assert_coin_consumed_condition(cvp.var1))
                if cvp.opcode == ConditionOpcode.ASSERT_MIN_TIME:
                    ret.append(make_assert_min_time_condition(cvp.var1))
                if cvp.opcode == ConditionOpcode.ASSERT_MY_COIN_ID:
                    ret.append(make_assert_my_coin_id_condition(cvp.var1))
                if cvp.opcode == ConditionOpcode.ASSERT_BLOCK_INDEX_EXCEEDS:
                    ret.append(make_assert_block_index_exceeds_condition(cvp.var1))
                if cvp.opcode == ConditionOpcode.ASSERT_BLOCK_AGE_EXCEEDS:
                    ret.append(make_assert_block_age_exceeds_condition(cvp.var1))

        return clvm.to_sexp_f([puzzle_for_conditions(ret), []])

    def generate_unsigned_transaction(self, amount, newpuzzlehash, coin: Coin,
                                      condition_dic: Dict[ConditionOpcode, List[ConditionVarPair]], fee: int = 0):
        spends = []
        spend_value = coin.amount
        change = spend_value - amount - fee
        puzzle_hash = coin.puzzle_hash
        pubkey, secretkey = self.get_keys(puzzle_hash)
        puzzle = puzzle_for_pk(pubkey.serialize())
        if ConditionOpcode.CREATE_COIN not in condition_dic:
            condition_dic[ConditionOpcode.CREATE_COIN] = []

        output = ConditionVarPair(ConditionOpcode.CREATE_COIN, newpuzzlehash, amount)
        condition_dic[output.opcode].append(output)
        if change > 0:
            changepuzzlehash = self.get_new_puzzlehash()
            change_output = ConditionVarPair(ConditionOpcode.CREATE_COIN, changepuzzlehash, change)
            condition_dic[output.opcode].append(change_output)
            solution = self.make_solution(condition_dic)
        else:
            solution = self.make_solution(condition_dic)

        spends.append((puzzle, CoinSolution(coin, solution)))
        return spends

    def sign_transaction(self, spends: (Program, [CoinSolution])):
        sigs = []
        for puzzle, solution in spends:
            pubkey, secretkey = self.get_keys(solution.coin.puzzle_hash)
            secretkey = BLSPrivateKey(secretkey)
            code_ = [puzzle, solution.solution]
            sexp = clvm.to_sexp_f(code_)
            err, con = conditions_for_solution(sexp)
            conditions_dict = conditions_by_opcode(con)

            for _ in hash_key_pairs_for_conditions_dict(conditions_dict):
                signature = secretkey.sign(_.message_hash)
                sigs.append(signature)
        aggsig = BLSSignature.aggregate(sigs)
        solution_list: List[CoinSolution] = [CoinSolution(coin_solution.coin, clvm.to_sexp_f([puzzle, coin_solution.solution])) for
             (puzzle, coin_solution) in spends]
        spend_bundle = SpendBundle(solution_list, aggsig)
        return spend_bundle

    def generate_signed_transaction(self, amount, newpuzzlehash, coin: Coin,
                                    condition_dic: Dict[ConditionOpcode, List[ConditionVarPair]] = None,
                                    fee: int = 0) -> Optional[SpendBundle]:
        if condition_dic is None:
            condition_dic = {}
        transaction = self.generate_unsigned_transaction(amount, newpuzzlehash, coin, condition_dic, fee)
        if transaction is None:
            return None
        return self.sign_transaction(transaction)