upd: add config option to enable builtin video thumbnail generator

.config/docker_example.yml

@@ -198,6 +198,11 @@ proxyRemoteFiles: true
 #   https://example.com/thumbnail.webp?thumbnail=1&url=https%3A%2F%2Fstorage.example.com%2Fpath%2Fto%2Fvideo.mp4
 #videoThumbnailGenerator: https://example.com
 
+# Enables the built-in thumbnail generator for remote videos. (default: false)
+# Only useful if "Cache remote files" is disabled, and "videoThumbnailGenerator" is unset.
+# Without it, remote video files that are not cached will not have any thumbnails.
+#enableBuiltinVideoThumbnailGenerator: false
+
 # Sign to ActivityPub GET request (default: true)
 signToActivityPubGet: true
 # check that inbound ActivityPub GET requests are signed ("authorized fetch")

.config/example.yml

@@ -213,6 +213,11 @@ proxyRemoteFiles: true
 #   https://example.com/thumbnail.webp?thumbnail=1&url=https%3A%2F%2Fstorage.example.com%2Fpath%2Fto%2Fvideo.mp4
 #videoThumbnailGenerator: https://example.com
 
+# Enables the built-in thumbnail generator for remote videos. (default: false)
+# Only useful if "Cache remote files" is disabled, and "videoThumbnailGenerator" is unset.
+# Without it, remote video files that are not cached will not have any thumbnails.
+#enableBuiltinVideoThumbnailGenerator: false
+
 # Sign to ActivityPub GET request (default: true)
 signToActivityPubGet: true
 # check that inbound ActivityPub GET requests are signed ("authorized fetch")

packages/backend/src/config.ts

@@ -86,6 +86,7 @@ type Source = {
 	mediaProxy?: string;
 	proxyRemoteFiles?: boolean;
 	videoThumbnailGenerator?: string;
+	enableBuiltinVideoThumbnailGenerator?: boolean;
 
 	customMOTD?: string[];
 
@@ -167,6 +168,7 @@ export type Config = {
 	mediaProxy: string;
 	externalMediaProxyEnabled: boolean;
 	videoThumbnailGenerator: string | null;
+	enableBuiltinVideoThumbnailGenerator: boolean;
 	redis: RedisOptions & RedisOptionsSource;
 	redisForPubsub: RedisOptions & RedisOptionsSource;
 	redisForJobQueue: RedisOptions & RedisOptionsSource;
@@ -272,6 +274,7 @@ export function loadConfig(): Config {
 		videoThumbnailGenerator: config.videoThumbnailGenerator ?
 			config.videoThumbnailGenerator.endsWith('/') ? config.videoThumbnailGenerator.substring(0, config.videoThumbnailGenerator.length - 1) : config.videoThumbnailGenerator
 			: null,
+		enableBuiltinVideoThumbnailGenerator: config.enableBuiltinVideoThumbnailGenerator ?? false,
 		userAgent: `Misskey/${version} (${config.url})`,
 		clientEntry: clientManifest['src/_boot_.ts'],
 		clientManifestExists: clientManifestExists,

packages/backend/src/core/VideoProcessingService.ts

@@ -51,14 +51,16 @@ export class VideoProcessingService {
 	@bindThis
 	public getExternalVideoThumbnailUrl(url: string): string | null {
 		if (this.config.videoThumbnailGenerator == null) {
+			if (this.config.enableBuiltinVideoThumbnailGenerator) {
 				return appendQuery(
 					`${this.config.url}/proxy/thumbnail.webp`,
-				query({
-					url,
-				}),
+					query({ url }),
 				);
 			}
 
+			return null;
+		}
+
 		return appendQuery(
 			`${this.config.videoThumbnailGenerator}/thumbnail.webp`,
 			query({

packages/backend/src/server/FileServerService.ts

@@ -83,12 +83,14 @@ export class FileServerService {
 				.catch(err => this.errorHandler(request, reply, err));
 		});
 
+		if (this.config.enableBuiltinVideoThumbnailGenerator) {
 			fastify.get<{
 				Querystring: { url: string; };
 			}>('/proxy/thumbnail.webp', async (request, reply) => {
 				return await this.videoThumbnailHandler(request, reply)
 					.catch(err => this.errorHandler(request, reply, err));
 			});
+		}
 
 		fastify.get<{
 			Params: { url: string; };
@@ -395,7 +397,7 @@ export class FileServerService {
 		if (file === '404') {
 			reply.code(404);
 			reply.header('Cache-Control', 'max-age=86400');
-			return reply.sendFile('/dummy.png', assets); // TODO: return webp
+			return reply.sendFile('/dummy.png', assets);
 		}
 
 		if (file === '204') {