From 2f1b857b7e7cd299afc2f975ab2bdb2807375764 Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Thu, 26 Nov 2020 13:44:48 +0300
Subject: [PATCH] Disallow empty group call identifier in requests.

---
 td/telegram/InputGroupCallId.cpp | 5 ++++-
 td/telegram/InputGroupCallId.h   | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/td/telegram/InputGroupCallId.cpp b/td/telegram/InputGroupCallId.cpp
index 74c2f04d4..1bc29c7d0 100644
--- a/td/telegram/InputGroupCallId.cpp
+++ b/td/telegram/InputGroupCallId.cpp
@@ -15,8 +15,11 @@ InputGroupCallId::InputGroupCallId(const tl_object_ptr<telegram_api::inputGroupC
     : group_call_id(input_group_call->id_), access_hash(input_group_call->access_hash_) {
 }
 
-Result<InputGroupCallId> InputGroupCallId::from_group_call_id(const string &group_call_id) {
+Result<InputGroupCallId> InputGroupCallId::from_group_call_id(const string &group_call_id, bool allow_empty) {
   if (group_call_id.empty()) {
+    if (!allow_empty) {
+      return Status::Error(400, "Empty group call identifier specified");
+    }
     return InputGroupCallId();
   }
 
diff --git a/td/telegram/InputGroupCallId.h b/td/telegram/InputGroupCallId.h
index b8583e1e6..e8f1d1313 100644
--- a/td/telegram/InputGroupCallId.h
+++ b/td/telegram/InputGroupCallId.h
@@ -28,7 +28,7 @@ class InputGroupCallId {
   InputGroupCallId(int64 group_call_id, int64 access_hash) : group_call_id(group_call_id), access_hash(access_hash) {
   }
 
-  static Result<InputGroupCallId> from_group_call_id(const string &group_call_id);
+  static Result<InputGroupCallId> from_group_call_id(const string &group_call_id, bool allow_empty = false);
 
   string get_group_call_id() const;