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//! [`ChatMemberHandler`] -- handles chat member updates.
//!
//! Ported from `python-telegram-bot`'s `ChatMemberHandler`. Supports filtering
//! by member update type (`my_chat_member`, `chat_member`, or both) and by
//! chat ID.
use std::collections::HashSet;
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
use rust_tg_bot_raw::types::update::Update;
use super::base::{Handler, HandlerCallback, HandlerResult, MatchResult};
/// Which kind of chat member update to handle.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[non_exhaustive]
pub enum ChatMemberType {
/// Only `my_chat_member` (the bot's own status changed).
MyChatMember,
/// Only `chat_member` (another user's status changed).
ChatMember,
/// Both `my_chat_member` and `chat_member`.
Any,
}
/// Handler for `Update.my_chat_member` and `Update.chat_member`.
pub struct ChatMemberHandler {
callback: HandlerCallback,
member_type: ChatMemberType,
chat_ids: HashSet<i64>,
block: bool,
}
impl ChatMemberHandler {
/// Create a new `ChatMemberHandler`.
///
/// `chat_ids` may be empty; when empty, all chats match.
pub fn new(
callback: HandlerCallback,
member_type: ChatMemberType,
chat_ids: HashSet<i64>,
block: bool,
) -> Self {
Self {
callback,
member_type,
chat_ids,
block,
}
}
}
impl Handler for ChatMemberHandler {
fn check_update(&self, update: &Update) -> Option<MatchResult> {
let has_my = update.my_chat_member().is_some();
let has_other = update.chat_member().is_some();
if !has_my && !has_other {
return None;
}
// Type filter
match self.member_type {
ChatMemberType::MyChatMember => {
if !has_my {
return None;
}
}
ChatMemberType::ChatMember => {
if !has_other {
return None;
}
}
ChatMemberType::Any => {}
}
// Chat ID filter
if !self.chat_ids.is_empty() {
let chat_id = update.effective_chat().map(|c| c.id)?;
if !self.chat_ids.contains(&chat_id) {
return None;
}
}
Some(MatchResult::Empty)
}
fn handle_update(
&self,
update: Arc<Update>,
match_result: MatchResult,
) -> Pin<Box<dyn Future<Output = HandlerResult> + Send>> {
(self.callback)(update, match_result)
}
fn block(&self) -> bool {
self.block
}
}