Publish the latest post in an RSS feed to an ActivityPub Starter Kit feed

rss2activitypub.js

import { XMLParser } from "fast-xml-parser";
import fetch from "node-fetch";

const RSS_URL = "https://jakelazaroff.com/rss.xml";
const ACTIVITYPUB_HOST = "https://shine-thunder-forgery.glitch.me";
const OUTBOX_URL = ACTIVITYPUB_HOST + "/test/outbox";
const CREATE_URL = ACTIVITYPUB_HOST + "/admin/create";
const ADMIN_USERNAME = "jake";
const ADMIN_PASSWORD = "test";

console.log(`Fetching RSS feed from ${RSS_URL}…`);
const rss = await fetch(RSS_URL);
const feed = new XMLParser().parse(await rss.text());
const latest = feed.rss.channel.item[0];

console.log(`Fetching ActivityPub feed from ${OUTBOX_URL}…`);
const outbox = await fetch(OUTBOX_URL);
const posts = await outbox.json();
const post = posts.orderedItems[0];

if (latest.link === post.object?.url) console.log("No new post in feed.");
else {
  console.log("Posting to ActivityPub feed…");
  const credentials = "Basic " + Buffer.from(ADMIN_USERNAME + ":" + ADMIN_PASSWORD).toString("base64");
  const date = new Date(latest.pubDate);
  const body = JSON.stringify({
    object: {
      url: latest.link,
      title: latest.title,
      summary: latest.description,
      content: latest["content:encoded"],
      published: date.toISOString()
    }
  });
  const res = await fetch(CREATE_URL, {
    method: "POST",
    body,
    headers: { authorization, "content-type": "application/json" }
  });

  if (!res.ok) throw new Error(`Got ${res.status} ${res.statusText} when creating post.`);
}

workflow.yml

on: [push]

jobs:
  deploy:
    name: Deploy
    runs-on: ubuntu-latest
    permissions:
      contents: read
      deployments: write

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install pnpm
        uses: pnpm/action-setup@v2
        with:
          version: latest

      - name: Set up Node
        uses: actions/setup-node@v3
        with:
          node-version: lts/*
          cache: "pnpm"

      - name: Install site dependencies
        run: pnpm install --frozen-lockfile

      - name: Build
        run: pnpm build

      - name: Deploy to Cloudflare Pages
        id: pages_deploy
        uses: cloudflare/pages-action@v1
        with:
          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          projectName: ${{ secrets.CLOUDFLARE_PAGES_PROJECT_NAME }}
          directory: build
          gitHubToken: ${{ secrets.GITHUB_TOKEN }}

      - name: Install script dependencies
        run: pnpm install fast-xml-parser node-fetch@2

      - name: Publish latest post to ActivityPub
        if: ${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) }}
        run: node ./rss2activitypub.js