reorg: separate frontend and backend

backend/src/InvidiousAPI.ts

@@ -0,0 +1,102 @@
+import fetch from 'node-fetch';
+
+interface InvidiousVideoThumbnail {
+  quality: string;
+  url: string;
+  width: number;
+  height: number;
+}
+
+interface InvidiousResult {
+  type: string;
+  title: string;
+  videoId: string;
+  playlistId: string;
+  author: string;
+  videoThumbnails?: InvidiousVideoThumbnail[];
+}
+
+export interface SearchResult {
+  type: string;
+  title: string;
+  author: string;
+  mediaUrl: string;
+  thumbnailUrl: string;
+}
+
+export interface ThumbnailResponse {
+  data: NodeJS.ReadableStream;
+  contentType: string;
+}
+
+const USE_INVIDIOUS = process.env.USE_INVIDIOUS || true;
+const INVIDIOUS_BASE_URL = process.env.INVIDIOUS_BASE_URL || 'http://invidious.nor';
+const INVIDIOUS_API_ENDPOINT = `${INVIDIOUS_BASE_URL}/api/v1`;
+
+export const getInvidiousSearchURL = (query: string): string => 
+  `${INVIDIOUS_API_ENDPOINT}/search?q=${encodeURIComponent(query)}`;
+
+export const getInvidiousThumbnailURL = (url: string): string =>
+  `${INVIDIOUS_BASE_URL}/${url}`;
+
+const preferredThumbnailAPIURL = (thumbnails: InvidiousVideoThumbnail[] | undefined): string => {
+  if (!thumbnails || thumbnails.length === 0) {
+    return '/assets/placeholder.jpg';
+  }
+
+  const mediumThumbnail = thumbnails.find(t => t.quality === 'medium');
+  const thumbnail = mediumThumbnail || thumbnails[0];
+  return `/api/thumbnail?url=${encodeURIComponent(thumbnail.url)}`;
+};
+
+const getMediaURL = (result: InvidiousResult): string => {
+  if (result.type === 'video') {
+    return `https://www.youtube.com/watch?v=${result.videoId}`;
+  } else if (result.type === 'playlist') {
+    return `https://www.youtube.com/playlist?list=${result.playlistId}`;
+  }
+
+  throw new Error(`Unknown result type: ${result.type}`);
+};
+
+export const searchInvidious = async (query: string): Promise<SearchResult[]> => {
+  try {
+    const response = await fetch(getInvidiousSearchURL(query));
+    if (!response.ok) {
+      throw new Error(`Invidious HTTP error: ${response.status}`);
+    }
+
+    const data = await response.json() as Array<InvidiousResult>;
+    return data.filter(item => {
+      return item.type === 'video' || item.type === 'playlist';
+    }).map(item => ({
+      type: item.type,
+      title: item.title,
+      author: item.author,
+      mediaUrl: getMediaURL(item),
+      thumbnailUrl: preferredThumbnailAPIURL(item.videoThumbnails)
+    }));
+  } catch (error) {
+    console.error('Failed to search Invidious:', error);
+    throw error;
+  }
+}
+
+export const fetchThumbnail = async (thumbnailUrl: string): Promise<ThumbnailResponse> => {
+  let path = thumbnailUrl;
+  if (thumbnailUrl.startsWith('http://') || thumbnailUrl.startsWith('https://')) {
+    const url = new URL(thumbnailUrl);
+    path = url.pathname + url.search;
+  }
+  path = path.replace(/^\/+/, ''); // Strip leading slash
+  
+  const response = await fetch(getInvidiousThumbnailURL(path));
+  if (!response.ok) {
+    throw new Error(`HTTP error! status: ${response.status}`);
+  }
+
+  return {
+    data: response.body,
+    contentType: response.headers.get('content-type') || 'image/jpeg'
+  };
+};