From d194bb08a319ddcb6858b14cbebb5b98ad1fa865 Mon Sep 17 00:00:00 2001
From: painor <pi.oussama@gmail.com>
Date: Tue, 12 Jan 2021 19:02:57 +0100
Subject: [PATCH] Add new format to resolve invite link

---
 telethon/utils.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/telethon/utils.py b/telethon/utils.py
index 636dd93d..028d3f92 100644
--- a/telethon/utils.py
+++ b/telethon/utils.py
@@ -1289,7 +1289,14 @@ def resolve_invite_link(link):
         payload = _decode_telegram_base64(link_hash)
 
     try:
-        return struct.unpack('>LLQ', payload)
+        if len(payload) == 12:
+            # New format
+            return 0, *struct.unpack('>LQ', payload)
+        elif len(payload) == 16:
+            # Old Format
+            return struct.unpack('>LLQ', payload)
+        else:
+            raise TypeError
     except (struct.error, TypeError):
         return None, None, None