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33 lines
1.3 KiB
33 lines
1.3 KiB
import { omit } from 'lodash';
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import { BN, stripHexPrefix } from 'ethereumjs-util';
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import Common, { Chain, Hardfork } from '@ethereumjs/common';
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import { TransactionFactory } from '@ethereumjs/tx';
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function buildTxParams(txMeta) {
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return {
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...omit(txMeta.txParams, 'gas'),
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gasLimit: txMeta.txParams.gas,
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};
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}
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function buildTransactionCommon(txMeta) {
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// This produces a transaction whose information does not completely match an
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// Optimism transaction — for instance, DEFAULT_CHAIN is still 'mainnet' and
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// genesis points to the mainnet genesis, not the Optimism genesis — but
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// considering that all we want to do is serialize a transaction, this works
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// fine for our use case.
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return Common.forCustomChain(Chain.Mainnet, {
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chainId: new BN(stripHexPrefix(txMeta.chainId), 16),
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networkId: new BN(txMeta.metamaskNetworkId, 10),
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// Optimism only supports type-0 transactions; it does not support any of
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// the newer EIPs since EIP-155. Source:
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// <https://github.com/ethereum-optimism/optimism/blob/develop/specs/l2geth/transaction-types.md>
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defaultHardfork: Hardfork.SpuriousDragon,
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});
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}
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export default function buildUnserializedTransaction(txMeta) {
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const txParams = buildTxParams(txMeta);
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const common = buildTransactionCommon(txMeta);
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return TransactionFactory.fromTxData(txParams, { common });
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}
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