Extract unrealized lot data from Vanguard accounts

vanguard-unrealized-lots.js

let main = async (account, units) => {
  const scrapeAccount = (accountWidget) => {
    const accountId = accountWidget.id;
    const accountName = accountWidget
      .querySelector("span.c11n-accordion__heading")
      .innerText.trim();
    const holdingsLinks = [
      ...accountWidget.querySelectorAll(
        `app-holdings tr[app-holdings-row] div.holdings-link`
      ),
    ];
    const holdingsIds = holdingsLinks.map((el) => el.id);
    return { accountId, accountName, holdingsIds };
  };
  const scrapeAccounts = () => {
    const accountWidgets = [...document.querySelectorAll("c11n-accordion")];
    return accountWidgets.map(scrapeAccount);
  };
  const fetchLots = async (account, holding) => {
    const unrealizedUrl = `https://personal1.vanguard.com/smn-client-cost-basis-accounting-webservice/costbasis/external/lots?request=unrealized`;
    const headers = new Headers();
    headers.append("Consumer-Application-Code", "HDV");
    headers.append("X-Account-Id", account);
    // headers.append("X-Hdv-Correlation-Id", "HDV-UI-<uuid>");
    headers.append("X-Holding-Id", holding);
    const resp = await fetch(unrealizedUrl, {
      headers,
      credentials: "include",
    });
    const j = await resp.json();
    return j.coveredLots;
  };
  const fetchAccount = async ({ accountId, accountName, holdingsIds }) => {
    const lots = await Promise.all(
      holdingsIds.map(async (holdingId) => {
        return await fetchLots(accountId, holdingId);
      })
    );
    return {
      accountId,
      accountName,
      holdingsIds,
      lots,
    };
  };
  const accounts = scrapeAccounts();
  const data = await Promise.all(accounts.map(fetchAccount));
  const resultString = JSON.stringify(data);
  const blob = new Blob([resultString], { type: "text/plain;charset=UTF-8" });
  const url = URL.createObjectURL(blob);
  window.open(url);
};