118 lines
3.4 KiB
TypeScript
118 lines
3.4 KiB
TypeScript
import Tx from 'ethereumjs-tx';
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import { bufferToHex } from 'ethereumjs-util';
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import { Wei } from 'libs/units';
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import { isValidETHAddress } from 'libs/validators';
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import { IFullWallet } from 'libs/wallet';
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import { translateRaw } from 'translations';
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import { ITransaction, IHexStrTransaction } from '../typings';
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import { hexEncodeQuantity, hexEncodeData } from 'libs/nodes/rpc/utils';
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import { TransactionFieldValues } from 'selectors/transaction/helpers';
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// we dont include the signature paramaters because web3 transactions are unsigned
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const computeIndexingHash = (tx: Buffer) => bufferToHex(makeTransaction(tx).hash(false));
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// Get useable fields from an EthTx object.
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const getTransactionFields = (t: Tx): IHexStrTransaction => {
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// For some crazy reason, toJSON spits out an array, not keyed values.
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const { data, gasLimit, gasPrice, to, nonce, value } = t;
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const chainId = t.getChainId();
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return {
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value: hexEncodeQuantity(value),
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data: hexEncodeData(data),
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// To address is unchecksummed, which could cause mismatches in comparisons
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to: hexEncodeData(to),
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// Everything else is as-is
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nonce: hexEncodeQuantity(nonce),
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gasPrice: hexEncodeQuantity(gasPrice),
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gasLimit: hexEncodeQuantity(gasLimit),
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chainId
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};
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};
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const getTransactionFee = (gasPrice: string, gasLimit: string) => {
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return Wei(gasPrice).mul(Wei(gasLimit));
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};
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/**
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* @description Return the minimum amount of ether needed
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* @param t
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*/
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const enoughBalanceViaTx = (t: Tx | ITransaction, accountBalance: Wei) =>
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makeTransaction(t)
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.getUpfrontCost()
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.lte(accountBalance);
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/**
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* @description Return the minimum amount of gas needed (for gas limit validation)
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* @param t
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*/
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const validGasLimit = (t: ITransaction) =>
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makeTransaction(t)
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.getBaseFee()
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.lte(t.gasLimit);
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/**
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* @description Check that gas limits and prices are within valid ranges
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* @param t
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*/
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const gasParamsInRange = (t: ITransaction) => {
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if (t.gasLimit.ltn(21000)) {
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throw Error('Gas limit must be at least 21000 for transactions');
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}
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if (t.gasLimit.gtn(5000000)) {
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throw Error(translateRaw('GETH_GasLimit'));
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}
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if (t.gasPrice.gt(Wei('1000000000000'))) {
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throw Error('Gas price too high. Please contact support if this was not a mistake.');
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}
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};
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const validAddress = (t: ITransaction) => {
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if (!isValidETHAddress(bufferToHex(t.to))) {
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throw Error(translateRaw('ERROR_5'));
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}
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};
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const makeTransaction = (
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t:
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| Partial<Tx>
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| Partial<ITransaction>
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| Partial<IHexStrTransaction>
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| Buffer
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| string
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| TransactionFieldValues
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) => new Tx(t);
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//TODO: check that addresses are always checksummed
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const signTx = async (t: ITransaction, w: IFullWallet) => {
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const tx = makeTransaction(t);
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const signedTx = await w.signRawTransaction(tx); //returns a serialized, signed tx
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return signedTx; //instead of returning the rawTx with it, we can derive it from the signedTx anyway
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};
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const validateTx = (t: ITransaction, accountBalance: Wei, isOffline: boolean) => {
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gasParamsInRange(t);
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if (!isOffline && !validGasLimit(t)) {
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throw Error('Not enough gas supplied');
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}
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if (!enoughBalanceViaTx(t, accountBalance)) {
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throw Error(translateRaw('GETH_Balance'));
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}
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validAddress(t);
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};
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export {
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signTx,
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validAddress,
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validGasLimit,
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enoughBalanceViaTx,
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gasParamsInRange,
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validateTx,
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makeTransaction,
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getTransactionFields,
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getTransactionFee,
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computeIndexingHash
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};
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