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GitHub Repository: sagemathinc/cocalc
 Path: blob/master/src/packages/next/pages/news/feed.json.tsx
Views: 687
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/*

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 *  This file is part of CoCalc: Copyright © 2023 Sagemath, Inc.

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 *  License: MS-RSL – see LICENSE.md for details

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 */

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import LRU from "lru-cache";

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import { get } from "@cocalc/server/news/get";

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import getCustomize from "@cocalc/database/settings/customize";

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import { slugURL } from "@cocalc/util/news";

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import { NewsItem } from "@cocalc/util/types/news";

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import { renderMarkdown } from "lib/news";

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import { GetServerSideProps } from "next";

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import IconLogo from "public/logo/icon.svg";

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const cache = new LRU<"feed", any>({ max: 10, ttl: 60 * 1000 });

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export default function RSS() {

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  return null;

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}

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export const getServerSideProps: GetServerSideProps = async ({ res }) => {

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  if (!res) return { props: {} };

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  try {

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    res.setHeader("Content-Type", "application/feed+json");

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    res.setHeader("Cache-Control", "public, max-age=3600");

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    res.write(JSON.stringify(await feed()));

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    res.end();

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  } catch (err) {

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    console.error(err);

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    res.statusCode = 500;

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    res.write(JSON.stringify({ error: `${err.message}` }));

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    res.end();

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  }

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  return {

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    props: {},

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  };

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};

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async function feed() {

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  const cached = cache.get("feed");

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  if (cached) return cached;

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  const data = await get();

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  const feed = await getFeed(data);

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  cache.set("feed", feed);

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  return feed;

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}

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function getItems(data: NewsItem[], dns): object[] {

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  return data.map((n) => {

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    const { id, text, title, date, url } = n;

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    const date_published = (

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      typeof date === "number" ? new Date(date * 1000) : date

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    ).toISOString();

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    const selfURL = `https://${dns}/${slugURL(n)}`;

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    return {

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      id,

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      url: selfURL,

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      external_url: url,

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      title,

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      content_html: renderMarkdown(text),

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      date_published,

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    };

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  });

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}

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// This follows https://www.jsonfeed.org/version/1.1/

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async function getFeed(data: NewsItem[]): Promise<object> {

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  const { siteName, dns } = await getCustomize();

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  const icon_url = IconLogo.src;

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  const home_page_url = `https://${dns}/news`;

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  const feed_url = `https://${dns}/feed.json`;

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  const feed = {

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    version: "https://jsonfeed.org/version/1.1",

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    title: `${siteName} News`,

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    home_page_url,

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    description: `News about ${siteName} – also available at https://${dns}/news`,

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    icon: icon_url,

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    favicon: icon_url,

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    feed_url,

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    items: getItems(data, dns),

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  };

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  return feed;

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}

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