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deploy a contract with leading zeros address

// SPDX-License-Identifier: undefined
pragma solidity 0.6.6;

contract Foo{
    address public owner;
    constructor(address _owner) public{
        owner = _owner;
    }
}

contract AddressFinder{
    function getAddress(address _factory, bytes32 _salt, bytes calldata _bytecode) external pure returns (address){
        return address(uint(keccak256(abi.encodePacked(
                hex'ff',
                _factory,
                _salt,
                keccak256(_bytecode)
            ))));
    }
}

contract Factory {
    event deployed(address addr, uint256 salt);

    function deploy(bytes memory _bytecode, uint _salt) public {
        address addr;
        assembly {
            addr := create2(0, add(_bytecode, 0x20), mload(_bytecode), _salt)
            if iszero(extcodesize(addr)) {
                revert(0, 0)
            }
        }
        emit deployed(addr, _salt);
    }

    function getCreationBytecode(address _owner) public pure returns (bytes memory) {
        bytes memory bytecode = type(Foo).creationCode;
        return abi.encodePacked(bytecode, abi.encode(_owner));
    }
}

context

How to depoly a contract with address have leading zeros like: 0x00000000 ?

  1. Foo is the contract I want to deploy, but I want get it’s address before deploy.
  2. deploy Factory contract first, get it’s address
  3. call getCreationBytecode get bytecode of Foo contract
  4. deploy AddressFinder contract
  5. call AddressFinder.getAddress by pass factory address and Foo bytecode, and give a random salt, you will get an address in return.
  6. use the same salt call Factory.deploy, you will get a Foo contract deployed in the same address you got at step5. Magic!
  7. repeat step5, with other random salt, until find an address you like.
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