ethers.js/lib.esm/address/contract-address.js

import { keccak256 } from "../crypto/index.js";
import { concat, dataSlice, getBigInt, getBytes, encodeRlp, assertArgument } from "../utils/index.js";
import { getAddress } from "./address.js";
// http://ethereum.stackexchange.com/questions/760/how-is-the-address-of-an-ethereum-contract-computed
/**
 *  Returns the address that would result from a ``CREATE`` for %%tx%%.
 *
 *  This can be used to compute the address a contract will be
 *  deployed to by an EOA when sending a deployment transaction (i.e.
 *  when the ``to`` address is ``null``).
 *
 *  This can also be used to compute the address a contract will be
 *  deployed to by a contract, by using the contract's address as the
 *  ``to`` and the contract's nonce.
 */
export function getCreateAddress(tx) {
    const from = getAddress(tx.from);
    const nonce = getBigInt(tx.nonce, "tx.nonce");
    let nonceHex = nonce.toString(16);
    if (nonceHex === "0") {
        nonceHex = "0x";
    }
    else if (nonceHex.length % 2) {
        nonceHex = "0x0" + nonceHex;
    }
    else {
        nonceHex = "0x" + nonceHex;
    }
    return getAddress(dataSlice(keccak256(encodeRlp([from, nonceHex])), 12));
}
/**
 *  Returns the address that would result from a ``CREATE2`` operation
 *  with the given %%from%%, %%salt%% and %%initCodeHash%%.
 *
 *  To compute the %%initCodeHash%% from a contract's init code, use
 *  the [[keccak256]] function.
 */
export function getCreate2Address(_from, _salt, _initCodeHash) {
    const from = getAddress(_from);
    const salt = getBytes(_salt, "salt");
    const initCodeHash = getBytes(_initCodeHash, "initCodeHash");
    assertArgument(salt.length === 32, "salt must be 32 bytes", "salt", _salt);
    assertArgument(initCodeHash.length === 32, "initCodeHash must be 32 bytes", "initCodeHash", _initCodeHash);
    return getAddress(dataSlice(keccak256(concat(["0xff", from, salt, initCodeHash])), 12));
}
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