Updated video download code

Program.cs

@@ -60,12 +60,27 @@ namespace TeleTok
                 return;
 
             var chatId = message.Chat.Id;
+            var messageText = update.Message.Text;
 
-            bool isUri = Uri.IsWellFormedUriString(message.ToString(), UriKind.RelativeOrAbsolute);
+            string videoPath;
 
+            // Checks if the text contains a valid URL
+            bool isUri = Uri.IsWellFormedUriString(messageText, UriKind.RelativeOrAbsolute);
+
+            // Passes the url along to the video downloader if it is valid AND a tiktok link
             if (isUri)
             {
-                Regex isTikTok = new Regex(@"(?x)(http(s)?:\/\/)?(?:www|m)\.(?:tiktok.com)\/(?:v|embed|trending)(?:\/)?(?:\?shareId=)?(?P<id>[\da-z]+)", RegexOptions.Singleline);
+                if(messageText.Contains("tiktok.com"))
+                {
+                    videoPath = VidDownload.TikTokUrl(messageText);
+
+                    Message ttVideo = await botClient.SendVideoAsync(
+                        chatId: chatId,
+                        videoPath: videoPath,
+                        supportsStreaming: true,
+                        cancellationToken: cancellationToken
+                    );
+                }
             }
 
             Console.WriteLine($"Received a '{messageText}' message in chat {chatId}.");

VidDownload.cs

@@ -5,6 +5,41 @@ namespace TeleTok
 {
     public class VidDownload
     {
+        static void TikTokURL(string videourl)
+        {
+            string url = videourl;
+
+            if(url.Contains("vm.tiktok.com"))
+            {
+                url = UnshortenUrl(url);
+            }
+
+            var proc = new Process 
+            {
+                // Function downloads tiktok urls passed from the listener
+                StartInfo = new ProcessStartInfo
+                {
+                    FileName = "/bin/bash",
+                    Arguments = "-c \"tiktok-scraper --filepath /app/videos -d " + videourl + "\"",
+                    UseShellExecute = false,
+                    RedirectStandardOutput = true,
+                    CreateNoWindow = true
+                }
+            };
+
+            proc.Start();
+            proc.WaitForExit();
 
         }
+
+        static string UnshortenUrl(string videourl)
+        {
+            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(videourl);
+            req.AllowAutoRedirect = false;
+            var resp = req.GetResponse();
+            string realUrl = resp.Headers["Location"];
+
+            return realUrl;
+        }
+    }
 }