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