@ledgerhq/coin-hedera/lib-es/bridge/utils.js

Ledger Hedera Coin integration

import BigNumber from "bignumber.js";
import cvsApi from "@ledgerhq/live-countervalues/api/index";
import { getFiatCurrencyByTicker } from "@ledgerhq/cryptoassets";
import { estimateMaxSpendable } from "./estimateMaxSpendable";
export const estimatedFeeSafetyRate = 2;
export async function getEstimatedFees(account) {
    try {
        const data = await cvsApi.fetchLatest([
            {
                from: account.currency,
                to: getFiatCurrencyByTicker("USD"),
                startDate: new Date(),
            },
        ]);
        if (data[0]) {
            return new BigNumber(10000)
                .dividedBy(new BigNumber(data[0]))
                .integerValue(BigNumber.ROUND_CEIL)
                .multipliedBy(estimatedFeeSafetyRate);
        }
        // eslint-disable-next-line no-empty
    }
    catch { }
    // as fees are based on a currency conversion, we stay
    // on the safe side here and double the estimate for "max spendable"
    return new BigNumber("150200").multipliedBy(estimatedFeeSafetyRate); // 0.001502 ℏ (as of 2023-03-14)
}
export async function calculateAmount({ account, transaction, }) {
    const amount = transaction.useAllAmount
        ? await estimateMaxSpendable({ account })
        : transaction.amount;
    return {
        amount,
        totalSpent: amount.plus(await getEstimatedFees(account)),
    };
}
// NOTE: convert from the non-url-safe version of base64 to the url-safe version (that the explorer uses)
export function base64ToUrlSafeBase64(data) {
    // Might be nice to use this alternative if .nvmrc changes to >= Node v14.18.0
    // base64url encoding option isn't supported until then
    // Buffer.from(data, "base64").toString("base64url");
    return data.replace(/\//g, "_").replace(/\+/g, "-");
}
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