[enh] check domain validity

requirements.txt

@@ -1,2 +1,3 @@
 sanic
 aiohttp
+validators

server.py

@@ -1,4 +1,5 @@
 import aiohttp
+import validators
 
 from sanic import Sanic
 from sanic.log import logger
@@ -27,6 +28,10 @@ async def check_http(request):
 
     domain = data["domain"]
 
+    if not validators.domain(domain):
+        logger.info(f"Invalid request, is not in the right format (domain is : {domain})")
+        return json_response({"status": "error", "content": "domain is not in the right format (do not include http:// or https://)"})
+
     # TODO DNS check
 
     async with aiohttp.ClientSession() as session: