@ledgerhq/coin-cardano/lib-es/prepareTransaction.js

Ledger Cardano Coin integration

import { BigNumber } from "bignumber.js";
import { types as TyphonTypes, address as TyphonAddress } from "@stricahq/typhonjs";
import { updateTransaction } from "@ledgerhq/coin-framework/bridge/jsHelpers";
import { buildTransaction } from "./buildTransaction";
import { fetchNetworkInfo } from "./api/getNetworkInfo";
/**
 * Prepare transaction before checking status
 *
 * @param {Account} account
 * @param {Transaction} transaction
 */
export const prepareTransaction = async (account, transaction) => {
    let patch = {};
    if (!transaction.protocolParams) {
        const networkInfo = await fetchNetworkInfo(account.currency);
        transaction = updateTransaction(transaction, {
            protocolParams: networkInfo.protocolParams,
        });
    }
    try {
        const cardanoTransaction = await buildTransaction(account, transaction);
        const transactionFees = cardanoTransaction.getFee();
        const transactionAmount = transaction.subAccountId
            ? transaction.amount
            : cardanoTransaction
                .getOutputs()
                .filter(o => !(o.address instanceof TyphonAddress.BaseAddress) ||
                !(o.address.paymentCredential.type === TyphonTypes.HashType.ADDRESS) ||
                o.address.paymentCredential.bipPath === undefined)
                .reduce((total, o) => total.plus(o.amount), new BigNumber(0));
        patch = { fees: transactionFees, amount: transactionAmount };
    }
    catch (error) {
        patch = { fees: new BigNumber(0), amount: transaction.amount };
    }
    return updateTransaction(transaction, patch);
};
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