* environment variable to enable/disable processing links in messages (for downloading videos)

* bot will not automatically download video from youtube or load it from cache. It will fetch video info first, then suggest to download or get video from cache (with retry options)
* some rewriting in sending/editing/replying to messages

src/callback_commands/download-yt-video.ts

@@ -0,0 +1,36 @@
+import {CallbackCommand} from "../base/callback-command";
+import {CallbackQuery} from "typescript-telegram-bot-api";
+import {Requirements} from "../base/requirements";
+import {Requirement} from "../base/requirement";
+import {commands} from "../index";
+import {YouTubeDownload} from "../commands/youtube-download";
+
+const downloadText = " 📥 Скачать";
+const getFromCacheText = "📥 Загрузить из кэша";
+
+export class DownloadYtVideo extends CallbackCommand {
+    data = "/ytdl";
+    text = " 📥 Скачать";
+
+    requirements = Requirements.Build(Requirement.SAME_USER);
+
+    constructor(text?: string, data?: string) {
+        super();
+
+        this.text = text || this.text;
+        this.data = data || this.data;
+    }
+
+    static withData(inCache?: boolean, data?: string): DownloadYtVideo {
+        return new DownloadYtVideo(inCache ? getFromCacheText : downloadText, data);
+    }
+
+    async execute(query: CallbackQuery): Promise<void> {
+        const videoId = query.data.split(" ")[1];
+        if (!videoId) return;
+
+        const yt = commands.find(c => c instanceof YouTubeDownload);
+        if (!yt) return;
+        await yt.downloadYouTubeVideo(query.message, {videoId: videoId});
+    }
+}