From 529b38afee20bf855cbd48d566149b015f840f72 Mon Sep 17 00:00:00 2001
From: Maybe Waffle <waffle.lapkin@gmail.com>
Date: Sat, 29 Jul 2023 14:03:10 +0400
Subject: [PATCH] Add a way to go `ChatId` -> `UserId`

---
 crates/teloxide-core/CHANGELOG.md         | 2 ++
 crates/teloxide-core/src/types/chat_id.rs | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/crates/teloxide-core/CHANGELOG.md b/crates/teloxide-core/CHANGELOG.md
index 72b70c74..b6160207 100644
--- a/crates/teloxide-core/CHANGELOG.md
+++ b/crates/teloxide-core/CHANGELOG.md
@@ -16,9 +16,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `Seconds` type, which represents a duration is seconds ([#859][pr859])
 - `VideoChatEnded::duration` field that was previously missed ([#859][pr859])
 - `ThreadId` newtype over `MessageId`, used for identifying reply threads ([#887][pr887])
+- `ChatId::as_user` ([#905][pr905])
 
 [pr851]: https://github.com/teloxide/teloxide/pull/851
 [pr887]: https://github.com/teloxide/teloxide/pull/887
+[pr905]: https://github.com/teloxide/teloxide/pull/905
 
 ### Fixed
 
diff --git a/crates/teloxide-core/src/types/chat_id.rs b/crates/teloxide-core/src/types/chat_id.rs
index cccbc4a3..71363115 100644
--- a/crates/teloxide-core/src/types/chat_id.rs
+++ b/crates/teloxide-core/src/types/chat_id.rs
@@ -50,6 +50,15 @@ impl ChatId {
         matches!(self.to_bare(), BareChatId::Channel(_))
     }
 
+    /// Returns user id, if this is an id of a user.
+    #[must_use]
+    pub fn as_user(self) -> Option<UserId> {
+        match self.to_bare() {
+            BareChatId::User(u) => Some(u),
+            BareChatId::Group(_) | BareChatId::Channel(_) => None,
+        }
+    }
+
     /// Converts this id to "bare" MTProto peer id.
     ///
     /// See [`BareChatId`] for more.