add Update::user(), Update::chat() functions

src/types/update.rs

@@ -2,10 +2,7 @@
 
 use serde::{Deserialize, Serialize};
 
-use crate::types::{
+use crate::types::{CallbackQuery, ChosenInlineResult, InlineQuery, Message, Poll, PreCheckoutQuery, ShippingQuery, User, Sender, Chat};
-    CallbackQuery, ChosenInlineResult, InlineQuery, Message, Poll,
-    PreCheckoutQuery, ShippingQuery,
-};
 
 /// This [object] represents an incoming update.
 ///
@@ -73,6 +70,62 @@ pub enum UpdateKind {
     Poll(Poll),
 }
 
+impl Update {
+    pub fn user(&self) -> Option<&User> {
+        match &self.kind {
+            UpdateKind::Message(m) => {
+                match m.from() {
+                    Some(Sender::User(user)) => Some(user),
+                    _ => None,
+                }
+            }
+            UpdateKind::EditedMessage(m) => {
+                match m.from() {
+                    Some(Sender::User(user)) => Some(user),
+                    _ => None,
+                }
+            }
+            UpdateKind::CallbackQuery(query) => {
+                Some(&query.from)
+            }
+            UpdateKind::ChosenInlineResult(chosen) => {
+                Some(&chosen.from)
+            }
+            UpdateKind::InlineQuery(query) => {
+                Some(&query.from)
+            }
+            UpdateKind::ShippingQuery(query) => {
+                Some(&query.from)
+            }
+            UpdateKind::PreCheckoutQuery(query) => {
+                Some(&query.from)
+            }
+            _ => None
+        }
+    }
+
+    pub fn chat(&self) -> Option<&Chat> {
+        match &self.kind {
+            UpdateKind::Message(m) => {
+                Some(&m.chat)
+            }
+            UpdateKind::EditedMessage(m) => {
+                Some(&m.chat)
+            }
+            UpdateKind::ChannelPost(p) => {
+                Some(&p.chat)
+            }
+            UpdateKind::EditedChannelPost(p) => {
+                Some(&p.chat)
+            }
+            UpdateKind::CallbackQuery(q) => {
+                Some(&q.message?.chat)
+            }
+            _ => None
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use crate::types::{