Update app.py

app.py

@@ -497,6 +497,25 @@ async def multi_download(request: Request):
     video_url = data.get('url')
     quality = data.get('quality')
     logger.info(f'{video_url}, {quality}')
+    if not video_url:
+        raise HTTPException(
+            status_code=400,
+            detail={"error": "Input 'url' is required."}
+        )
+    
+    # Basic URL validation: checks if it starts with http/https and has some content after.
+    # For more robust validation, consider using a library like 'validators'.
+    if not re.match(r'^https?://\S+', str(video_url)): # Ensure video_url is treated as string for regex
+        raise HTTPException(
+            status_code=400,
+            detail={"error": f"Input 'url' ('{video_url}') is not a valid URL. It must start with http:// or https://."}
+        )
+
+    if not quality: # Checks for None or empty string
+        raise HTTPException(
+            status_code=400,
+            detail={"error": "This version of shortcut is outdated. Get the latest version of Chrunos Multi Downloader shortcut."}
+        )
     if quality == "mp3":
         parameter = 'type=audio'
     else: