nasa-patch-search/index.ts

import { parse } from "node-html-parser";

const BASE_URL =
  "https://www.nasa.gov/gallery/human-spaceflight-mission-patches/";

async function getPatchHrefs() {
  function getGalleryPageHref(page: number) {
    if (page > 1) {
      return `${BASE_URL}page/${page}/`;
    } else {
      return BASE_URL;
    }
  }

  const hrefRequests = [...Array(7).keys()]
    .map((val) => ++val)
    .map((page) =>
      (async () => {
        const req = await fetch(getGalleryPageHref(page));
        const data = parse(await req.text());

        const gallery = data
          .getElementsByTagName("div")
          .filter((el) => el.classList.contains("hds-gallery-items"))
          .shift();

        return gallery
          ?.getElementsByTagName("a")
          .map((el) => el.getAttribute("href"))
          .filter((el) => el) as string[];
      })(),
    );

  const hrefLists = await Promise.all(hrefRequests);

  return hrefLists.flat();
}

const allPatches = await getPatchHrefs();

const patchRequests = allPatches.map((url) =>
  (async () => {
    const req = await fetch(url);
    const data = parse(await req.text());
    return {
      url,
      description:
        data.getElementsByTagName("h1")[0].nextElementSibling?.innerText,
    };
  })(),
);

const dirtyPatchDescriptions = await Promise.all(patchRequests);
const patchDescriptions = dirtyPatchDescriptions.filter(
  ({ description }) => description,
) as { url: string; description: string }[];

console.log(patchDescriptions);