Feature flags feature (#2803)

src/server/api/endpoints/meta.ts

@@ -39,6 +39,15 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 		recaptchaSitekey: config.recaptcha ? config.recaptcha.site_key : null,
 		swPublickey: config.sw ? config.sw.public_key : null,
 		hidedTags: (me && me.isAdmin) ? meta.hidedTags : undefined,
-		bannerUrl: meta.bannerUrl
+		bannerUrl: meta.bannerUrl,
+		features: {
+			registration: !meta.disableRegistration,
+			localTimeLine: !meta.disableLocalTimeline,
+			elasticsearch: config.elasticsearch ? true : false,
+			recaptcha: config.recaptcha ? true : false,
+			objectStorage: config.drive && config.drive.storage === 'minio',
+			twitter: config.twitter ? true : false,
+			serviceWorker: config.sw ? true : false
+		}
 	});
 });