69 lines
2.5 KiB
JavaScript
69 lines
2.5 KiB
JavaScript
import { keccak256 } from "../crypto/index.js";
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import { concat, dataSlice, getBigInt, getBytes, encodeRlp, assertArgument } from "../utils/index.js";
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import { getAddress } from "./address.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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* @example
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* from = "0x8ba1f109551bD432803012645Ac136ddd64DBA72";
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* nonce = 5;
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*
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* getCreateAddress({ from, nonce });
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* //_result:
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*/
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export function getCreateAddress(tx) {
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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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}
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else if (nonceHex.length % 2) {
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nonceHex = "0x0" + nonceHex;
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}
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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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* For a quick overview and example of ``CREATE2``, see [[link-ricmoo-wisps]].
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*
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* @example
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* // The address of the contract
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* from = "0x8ba1f109551bD432803012645Ac136ddd64DBA72"
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*
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* // The salt
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* salt = id("HelloWorld")
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*
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* // The hash of the initCode
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* initCode = "0x6394198df16000526103ff60206004601c335afa6040516060f3";
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* initCodeHash = keccak256(initCode)
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*
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* getCreate2Address(from, salt, initCodeHash)
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* //_result:
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*/
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export function getCreate2Address(_from, _salt, _initCodeHash) {
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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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//# sourceMappingURL=contract-address.js.map
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