Fix #13, make youtube API optional

src/lib/server/timeline.ts

@@ -2,11 +2,13 @@ import {
   HASHTAG_FILTER,
   MASTODON_INSTANCE,
   URL_FILTER,
-  YOUTUBE_API_KEY
+  YOUTUBE_API_KEY,
+  YOUTUBE_DISABLE
 } from '$env/static/private';
 import type { Post, Tag, TimelineEvent } from '$lib/mastodon/response';
 import { getPosts, savePost } from '$lib/server/db';
 import { createFeed, saveAtomFeed } from '$lib/server/rss';
+import { isTruthy } from '$lib/truthyString';
 import { WebSocket } from 'ws';
 
 const YOUTUBE_REGEX = new RegExp(
@@ -17,6 +19,11 @@ export class TimelineReader {
   private static _instance: TimelineReader;
 
   private static async isMusicVideo(videoId: string) {
+    if (YOUTUBE_API_KEY === undefined) {
+      // Assume that it *is* a music link when no YT API key is provided
+      // If it should assumed to not be YOUTUBE_DISABLE needs to be set to something truthy
+      return true;
+    }
     const searchParams = new URLSearchParams([
       ['part', 'snippet'],
       ['id', videoId],
@@ -50,6 +57,9 @@ export class TimelineReader {
   }
 
   private static async checkYoutubeMatches(postContent: string): Promise<boolean> {
+    if (isTruthy(YOUTUBE_DISABLE)) {
+      return false;
+    }
     const matches = postContent.matchAll(YOUTUBE_REGEX);
     for (const match of matches) {
       if (match === undefined || match.groups === undefined) {