From e1d2c81dca7c26c11365457ad2f7857853249471 Mon Sep 17 00:00:00 2001
From: Lonami Exo <totufals@hotmail.com>
Date: Sat, 7 Nov 2020 12:46:46 +0100
Subject: [PATCH] Parse part of newer bot file IDs for photos

Helps with #1613.
---
 telethon/utils.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/telethon/utils.py b/telethon/utils.py
index 81ba9523..a5f95e9a 100644
--- a/telethon/utils.py
+++ b/telethon/utils.py
@@ -1161,15 +1161,20 @@ def resolve_bot_file_id(file_id):
             attributes=attributes,
             file_reference=b''
         )
-    elif (version == 2 and len(data) == 44) or (version == 4 and len(data) == 49):
+    elif (version == 2 and len(data) == 44) or (version == 4 and len(data) in (49, 77)):
         if version == 2:
             (file_type, dc_id, media_id, access_hash,
                 volume_id, secret, local_id) = struct.unpack('<iiqqqqi', data)
-        # elif version == 4:
-        else:
+        # else version == 4:
+        elif len(data) == 49:
             # TODO Figure out what the extra five bytes mean
             (file_type, dc_id, media_id, access_hash,
                 volume_id, secret, local_id, _) = struct.unpack('<iiqqqqi5s', data)
+        elif len(data) == 77:
+            # See #1613.
+            (file_type, dc_id, _, media_id, access_hash, volume_id, _, local_id, _) = struct.unpack('<ii28sqqq12sib', data)
+        else:
+            return None
 
         if not (1 <= dc_id <= 5):
             return None