Fix #9: Add WebSub support

.env.EXAMPLE

@@ -6,6 +6,7 @@ MASTODON_INSTANCE = 'metalhead.club'
 BASE_URL = 'https://moshingmammut.phlaym.net'
 VERBOSE = false
 IGNORE_USERS = @moshhead@metalhead.club
+WEBSUB_HUB = 'http://pubsubhubbub.superfeedr.com'
 
 PUBLIC_REFRESH_INTERVAL = 10000
 PUBLIC_MASTODON_INSTANCE_DISPLAY_NAME = 'Metalhead.club'

src/app.html

@@ -15,6 +15,7 @@
     <meta name="theme-color" content="#17063b" media="(prefers-color-scheme: dark)" />
     <meta name="theme-color" content="#BCB9B2" media="(prefers-color-scheme: light)" />
     <link rel="alternate" type="application/atom+xml" href="/feed.xml" title="Atom Feed" />
+    <link rel="hub" href="https://pubsubhubbub.superfeedr.com" />
     %sveltekit.head%
     <style>
       body {

src/lib/server/db.ts

@@ -196,7 +196,7 @@ export async function savePost(post: Post): Promise<undefined> {
   if (!databaseReady) {
     await waitReady();
   }
-  return new Promise((resolve, reject) => {
+  return await new Promise<undefined>((resolve, reject) => {
     console.debug(`Saving post ${post.url}`);
     const account = post.account;
     db.run(

src/lib/server/rss.ts

@@ -1,4 +1,4 @@
-import { BASE_URL } from '$env/static/private';
+import { BASE_URL, WEBSUB_HUB } from '$env/static/private';
 import { PUBLIC_MASTODON_INSTANCE_DISPLAY_NAME } from '$env/static/public';
 import type { Post } from '$lib//mastodon/response';
 import { Feed } from 'feed';
@@ -6,6 +6,7 @@ import fs from 'fs/promises';
 
 export function createFeed(posts: Post[]): Feed {
   const baseUrl = BASE_URL.endsWith('/') ? BASE_URL : BASE_URL + '/';
+  const hub = WEBSUB_HUB ? WEBSUB_HUB : undefined;
   const feed = new Feed({
     title: `${PUBLIC_MASTODON_INSTANCE_DISPLAY_NAME} music feed`,
     description: `Posts about music on ${PUBLIC_MASTODON_INSTANCE_DISPLAY_NAME}`,
@@ -19,6 +20,7 @@ export function createFeed(posts: Post[]): Feed {
     feedLinks: {
       atom: `${BASE_URL}/feed.xml`
     },
+    hub: hub,
     author: {
       name: '@aymm',
       link: 'https://metalhead.club/@aymm'
@@ -40,8 +42,23 @@ export function createFeed(posts: Post[]): Feed {
     });
   });
   feed.addCategory('Music');
+
   return feed;
 }
 export async function saveAtomFeed(feed: Feed) {
   await fs.writeFile('feed.xml', feed.atom1(), { encoding: 'utf8' });
+  if (!WEBSUB_HUB) {
+    return;
+  }
+  try {
+    const params = new URLSearchParams();
+    params.append('hub.mode', 'publish');
+    params.append('hub.url', `${BASE_URL}/feed.xml`);
+    await fetch(WEBSUB_HUB, {
+      method: 'POST',
+      body: params
+    });
+  } catch (e) {
+    console.error('Failed to update WebSub hub', e);
+  }
 }