Init

.gitignore

@@ -0,0 +1,3 @@
+/target
+
+.vscode

Cargo.toml

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+[package]
+name = "telegram-twitch-notifier"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+once_cell = "1.20.3"
+eyre = { version = "0.6" }
+
+tokio = { version = "1.43.0", features = ["rt-multi-thread", "macros"] }
+futures = "0.3.31"
+
+teloxide = { version = "0.13.0", features = ["macros", "webhooks-axum", "cache-me", "throttle"] }
+twitch_api = { version = "0.7.0", features = ["reqwest", "helix", "eventsub", "hmac"] }
+twitch_oauth2 = "0.15.1"
+
+axum = { version = "0.8.1", features = ["http2"] }
+http-body-util = "0.1.2"
+
+retainer = "0.3.0"
+
+reqwest = "0.12.12"

src/bot.rs

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+use std::{error::Error, sync::Arc};
+
+use teloxide::{
+    Bot,
+    adaptors::throttle::Limits,
+    dispatching::{HandlerExt, dialogue::GetChatId},
+    dptree::{self, Handler},
+    macros::BotCommands,
+    prelude::{Dispatcher, LoggingErrorHandler, Requester, RequesterExt},
+    types::{BotCommand, Message},
+    update_listeners::webhooks,
+};
+
+use crate::{config::CONFIG, subscription_manager::SubscriptionManager};
+
+pub type BotHandlerInternal = Result<(), Box<dyn Error + Send + Sync>>;
+type BotHandler = Handler<
+    'static,
+    dptree::di::DependencyMap,
+    BotHandlerInternal,
+    teloxide::dispatching::DpHandlerDescription,
+>;
+
+/// These commands are supported:
+#[derive(BotCommands, Clone)]
+#[command(rename_rule = "lowercase")]
+enum Command {
+    Start,
+    Help,
+    Subscribe(String),
+    Unsubscribe(String),
+}
+
+pub async fn help_message_handler(bot: Bot, message: Message) -> BotHandlerInternal {
+    const HELP_MESSAGE: &str = r#"""
+    Welcome!
+
+    This bot allow you to subscribe to receive start stream notifications.
+    """#;
+
+    match bot
+        .send_message(message.chat_id().unwrap(), HELP_MESSAGE)
+        .await
+    {
+        Ok(_) => Ok(()),
+        Err(err) => Err(Box::new(err)),
+    }
+}
+
+pub async fn subscribe_handler(
+    bot: Bot,
+    message: Message,
+    subscription_manager: Arc<SubscriptionManager>,
+    username: String,
+) -> BotHandlerInternal {
+    let user_id = message.clone().from.unwrap().id;
+
+    subscription_manager.subscribe(user_id.0, username).await;
+
+    match bot
+        .send_message(message.chat_id().unwrap(), "Subscribed!")
+        .await
+    {
+        Ok(_) => Ok(()),
+        Err(err) => Err(Box::new(err)),
+    }
+}
+
+pub async fn unsubscribe_handler(
+    bot: Bot,
+    message: Message,
+    subscription_manager: Arc<SubscriptionManager>,
+    username: String,
+) -> BotHandlerInternal {
+    let user_id = message.clone().from.unwrap().id;
+
+    subscription_manager.unsubscribe(user_id.0, username).await;
+
+    match bot
+        .send_message(message.chat_id().unwrap(), "Unsubscribed!")
+        .await
+    {
+        Ok(_) => Ok(()),
+        Err(err) => Err(Box::new(err)),
+    }
+}
+
+pub async fn get_handler() -> BotHandler {
+    dptree::entry().branch(dptree::entry().filter_command::<Command>().endpoint(
+        |bot: Bot,
+         message: Message,
+         command: Command,
+         subscription_manager: Arc<SubscriptionManager>| async move {
+            match command {
+                Command::Start | Command::Help => help_message_handler(bot, message).await,
+                Command::Subscribe(username) => {
+                    subscribe_handler(bot, message, subscription_manager, username).await
+                }
+                Command::Unsubscribe(username) => {
+                    unsubscribe_handler(bot, message, subscription_manager, username).await
+                }
+            }
+        },
+    ))
+}
+
+pub async fn get_commands() -> Vec<BotCommand> {
+    vec![
+        BotCommand {
+            command: "start".into(),
+            description: "Start the bot".into(),
+        },
+        BotCommand {
+            command: "help".into(),
+            description: "Show help".into(),
+        },
+        BotCommand {
+            command: "subscribe".into(),
+            description: "Subscribe to the newsletter".into(),
+        },
+        BotCommand {
+            command: "unsubscribe".into(),
+            description: "Unsubscribe from the newsletter".into(),
+        },
+    ]
+}
+
+pub async fn start_bot(subscription_manager: Arc<SubscriptionManager>) {
+    let bot = Bot::new(CONFIG.bot_token.clone())
+        .throttle(Limits::default())
+        .cache_me();
+
+    let handler = get_handler().await;
+    let commands = get_commands().await;
+
+    let _ = bot.set_my_commands(commands).await;
+
+    let mut dispatcher = Dispatcher::builder(bot.clone(), handler)
+        .dependencies(dptree::deps![subscription_manager])
+        .build();
+
+    let addr = ([0, 0, 0, 0], CONFIG.telegram_webhook_port).into();
+    let url = CONFIG.telegram_webhook_url.parse().unwrap();
+    let update_listener = webhooks::axum(bot, webhooks::Options::new(addr, url))
+        .await
+        .expect("Couldn't setup webhook");
+
+    dispatcher
+        .dispatch_with_listener(
+            update_listener,
+            LoggingErrorHandler::with_custom_text("An error from the update listener"),
+        )
+        .await;
+}

src/config.rs

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+use once_cell::sync::Lazy;
+
+pub struct Config {
+    pub bot_token: String,
+
+    pub telegram_webhook_url: String,
+    pub telegram_webhook_port: u16,
+
+    pub twitch_client_id: String,
+    pub twitch_client_secret: String,
+
+    pub twitch_signing_secret: String,
+
+    pub twitch_webhook_url: String,
+    pub twitch_webhook_port: u16,
+}
+
+impl Config {
+    fn load() -> Self {
+        Self {
+            bot_token: std::env::var("BOT_TOKEN").expect("BOT_TOKEN is not set"),
+
+            telegram_webhook_url: std::env::var("TELEGRAM_WEBHOOK_URL")
+                .expect("TELEGRAM_WEBHOOK_URL is not set"),
+            telegram_webhook_port: std::env::var("TELEGRAM_WEBHOOK_PORT")
+                .expect("TELEGRAM_WEBHOOK_PORT is not set")
+                .parse()
+                .expect("TELEGRAM_WEBHOOK_PORT is not a valid u16"),
+
+            twitch_client_id: std::env::var("TWITCH_CLIENT_ID")
+                .expect("TWITCH_CLIENT_ID is not set"),
+            twitch_client_secret: std::env::var("TWITCH_CLIENT_SECRET")
+                .expect("TWITCH_CLIENT_SECRET is not set"),
+
+            twitch_signing_secret: std::env::var("TWITCH_SIGNING_SECRET")
+                .expect("TWITCH_SIGNING_SECRET is not set"),
+
+            twitch_webhook_url: std::env::var("TWITCH_WEBHOOK_URL")
+                .expect("TWITCH_WEBHOOK_URL is not set"),
+            twitch_webhook_port: std::env::var("TWITCH_WEBHOOK_PORT")
+                .expect("TWITCH_WEBHOOK_PORT is not set")
+                .parse()
+                .expect("TWITCH_WEBHOOK_PORT is not a valid u16"),
+        }
+    }
+}
+
+pub static CONFIG: Lazy<Config> = Lazy::new(Config::load);

src/main.rs

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+pub mod bot;
+pub mod config;
+pub mod subscription_manager;
+pub mod twitch_webhook;
+
+use std::sync::Arc;
+
+use bot::start_bot;
+use subscription_manager::SubscriptionManager;
+use twitch_webhook::start_twitch_webhook;
+
+#[tokio::main]
+async fn main() {
+    let subscription_manager = Arc::new(SubscriptionManager::new());
+
+    subscription_manager.init().await;
+
+    let (_, webhook_result) = tokio::join!(
+        start_bot(subscription_manager.clone()),
+        start_twitch_webhook(subscription_manager)
+    );
+
+    if let Err(e) = webhook_result {
+        eprintln!("Error in webhook: {:?}", e);
+    }
+}

src/subscription_manager.rs

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+use std::collections::{HashMap, HashSet};
+
+use tokio::sync::RwLock;
+
+pub struct SubscriptionManager {
+    pub subscriptions: RwLock<HashMap<String, HashSet<u64>>>,
+}
+
+impl SubscriptionManager {
+    pub fn new() -> Self {
+        Self {
+            subscriptions: RwLock::new(HashMap::new()),
+        }
+    }
+
+    pub async fn init(&self) {
+        println!("SubscriptionManager initialized");
+    }
+
+    pub async fn subscribe(&self, telegram_user_id: u64, username: String) {
+        self.subscriptions
+            .write()
+            .await
+            .entry(username)
+            .or_insert(HashSet::new())
+            .insert(telegram_user_id);
+    }
+
+    pub async fn unsubscribe(&self, telegram_user_id: u64, username: String) {
+        self.subscriptions
+            .write()
+            .await
+            .entry(username)
+            .and_modify(|set| {
+                set.remove(&telegram_user_id);
+            });
+    }
+}

src/twitch_webhook.rs

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+use std::{net::SocketAddr, sync::Arc};
+
+use axum::{
+    Extension, Router,
+    body::HttpBody,
+    http::{self, StatusCode},
+    response::IntoResponse,
+    routing::post,
+};
+use eyre::{Context, ContextCompat};
+use futures::TryStreamExt as _;
+use http_body_util::BodyExt as _;
+use tokio::{net::TcpListener, sync::RwLock};
+use twitch_api::{
+    HelixClient,
+    client::ClientDefault,
+    eventsub::{
+        Event, EventType, Status,
+        stream::{StreamOnlineV1, StreamOnlineV1Payload},
+    },
+};
+use twitch_oauth2::AppAccessToken;
+
+use crate::{config::CONFIG, subscription_manager::SubscriptionManager};
+
+pub async fn eventsub_register(
+    token: Arc<RwLock<AppAccessToken>>,
+    login: String,
+    webhook_url: String,
+) -> Result<(), eyre::Report> {
+    tokio::time::sleep(tokio::time::Duration::from_secs(5)).await;
+
+    let client: HelixClient<'_, reqwest::Client> = HelixClient::new();
+
+    let channel_information = client
+        .get_channel_from_login(&login, &*token.read().await)
+        .await
+        .wrap_err("when getting channel")?
+        .wrap_err("when getting channel")?;
+
+    let broadcaster_id = channel_information.broadcaster_id;
+
+    let mut interval = tokio::time::interval(tokio::time::Duration::from_secs(24 * 60 * 60));
+
+    loop {
+        interval.tick().await;
+
+        let subs = client
+            .get_eventsub_subscriptions(Status::Enabled, None, None, &*token.read().await)
+            .map_ok(|events| {
+                futures::stream::iter(events.subscriptions.into_iter().map(Ok::<_, eyre::Report>))
+            })
+            .try_flatten()
+            .try_filter(|event| futures::future::ready(event.transport.is_webhook()))
+            .try_collect::<Vec<_>>()
+            .await?;
+
+        let online_exists = subs.iter().any(|sub| {
+            sub.transport.as_webhook().unwrap().callback == webhook_url
+                && sub.type_ == EventType::StreamOnline
+                && sub.version == "1"
+                && sub
+                    .condition
+                    .as_object()
+                    .expect("a stream.online did not contain broadcaster")
+                    .get("broadcaster_user_id")
+                    .unwrap()
+                    .as_str()
+                    == Some(broadcaster_id.as_str())
+        });
+
+        let transport = twitch_api::eventsub::Transport::webhook(
+            webhook_url.clone(),
+            CONFIG.twitch_signing_secret.clone(),
+        );
+
+        if !online_exists {
+            client
+                .create_eventsub_subscription(
+                    StreamOnlineV1::broadcaster_user_id(broadcaster_id.clone()),
+                    transport.clone(),
+                    &*token.read().await,
+                )
+                .await
+                .wrap_err_with(|| "when registering online event")?;
+        }
+    }
+}
+
+pub async fn twitch_eventsub(
+    Extension(cache): Extension<Arc<retainer::Cache<http::HeaderValue, ()>>>,
+    request: http::Request<axum::body::Body>,
+) -> impl IntoResponse {
+    const MAX_ALLOWED_RESPONSE_SIZE: u64 = 64 * 1024;
+
+    let (parts, body) = request.into_parts();
+    let response_content_length = match body.size_hint().upper() {
+        Some(v) => v,
+        None => MAX_ALLOWED_RESPONSE_SIZE + 1,
+    };
+    let body = if response_content_length < MAX_ALLOWED_RESPONSE_SIZE {
+        body.collect().await.unwrap().to_bytes().to_vec()
+    } else {
+        panic!("too big data given")
+    };
+
+    let request = http::Request::from_parts(parts, &*body);
+
+    if !Event::verify_payload(&request, CONFIG.twitch_signing_secret.as_bytes()) {
+        return (StatusCode::BAD_REQUEST, "Invalid signature".to_string());
+    }
+
+    if let Some(id) = request.headers().get("Twitch-Eventsub-Message-Id") {
+        if cache.get(id).await.is_none() {
+            cache.insert(id.clone(), (), 400).await;
+        } else {
+            return (StatusCode::OK, "".to_string());
+        }
+    }
+
+    let event = Event::parse_http(&request).unwrap();
+
+    if let Some(ver) = event.get_verification_request() {
+        return (StatusCode::OK, ver.challenge.clone());
+    }
+
+    if event.is_revocation() {
+        return (StatusCode::OK, "".to_string());
+    }
+    use twitch_api::eventsub::{Message as M, Payload as P};
+
+    match event {
+        Event::StreamOnlineV1(P {
+            message:
+                M::Notification(StreamOnlineV1Payload {
+                    broadcaster_user_id,
+                    started_at,
+                    ..
+                }),
+            ..
+        }) => {
+            todo!(
+                "StreamOnlineV1: broadcaster_user_id: {}, started_at: {}",
+                broadcaster_user_id,
+                started_at
+            );
+        }
+        _ => {}
+    }
+    (StatusCode::OK, String::default())
+}
+
+struct TwitchWebhookServer {
+    subscription_manager: Arc<SubscriptionManager>,
+    subscribed_to: Arc<RwLock<Vec<String>>>,
+    app_access_token: Arc<RwLock<AppAccessToken>>,
+}
+
+impl TwitchWebhookServer {
+    pub fn new(
+        subscription_manager: Arc<SubscriptionManager>,
+        app_access_token: Arc<RwLock<AppAccessToken>>,
+    ) -> Self {
+        Self {
+            subscription_manager,
+            subscribed_to: Arc::new(RwLock::new(Vec::new())),
+            app_access_token,
+        }
+    }
+
+    pub async fn start_webhook_server(&self) {
+        let retainer = Arc::new(retainer::Cache::<axum::http::HeaderValue, ()>::new());
+
+        let ret = retainer.clone();
+        let _: tokio::task::JoinHandle<Result<(), ()>> = tokio::spawn(async move {
+            ret.monitor(10, 0.50, tokio::time::Duration::from_secs(86400 / 2))
+                .await;
+            Ok(())
+        });
+
+        let app = Router::new()
+            .route(
+                "/twitch/eventsub/",
+                post(move |cache, request| twitch_eventsub(cache, request)),
+            )
+            .layer(Extension(retainer));
+
+        let address = SocketAddr::new([0, 0, 0, 0].into(), CONFIG.twitch_webhook_port);
+
+        let _ = axum::serve(
+            TcpListener::bind(address).await.unwrap(),
+            app.into_make_service(),
+        )
+        .await;
+    }
+
+    pub async fn subscribe(&self, streamer: String) {
+        let _ = eventsub_register(
+            self.app_access_token.clone(),
+            streamer,
+            format!("{}/twitch/eventsub/", CONFIG.twitch_webhook_url),
+        )
+        .await;
+    }
+
+    pub async fn check_subscriptions(&self) {
+        loop {
+            let streamers = self
+                .subscription_manager
+                .subscriptions
+                .read()
+                .await
+                .keys()
+                .cloned()
+                .collect::<Vec<String>>();
+
+            for streamer in streamers {
+                let is_subscribed = self.subscribed_to.read().await.contains(&streamer);
+
+                if !is_subscribed {
+                    self.subscribe(streamer.clone()).await;
+                    self.subscribed_to.write().await.push(streamer);
+                }
+            }
+
+            tokio::time::sleep(tokio::time::Duration::from_secs(60)).await;
+        }
+    }
+
+    pub async fn start(&self) -> Result<(), eyre::Report> {
+        let subscribe_future = self.check_subscriptions();
+        let webhook_future = self.start_webhook_server();
+
+        futures::join!(subscribe_future, webhook_future);
+
+        Ok(())
+    }
+}
+
+pub async fn start_twitch_webhook(
+    subscription_manager: Arc<SubscriptionManager>,
+) -> Result<(), eyre::Report> {
+    let client: HelixClient<_> = twitch_api::HelixClient::with_client(
+        <reqwest::Client>::default_client_with_name(Some(
+            "twitch-rs/eventsub"
+                .parse()
+                .wrap_err_with(|| "when creating header name")
+                .unwrap(),
+        ))
+        .wrap_err_with(|| "when creating client")?,
+    );
+
+    let token = twitch_oauth2::AppAccessToken::get_app_access_token(
+        &client,
+        CONFIG.twitch_client_id.clone().into(),
+        CONFIG.twitch_client_secret.clone().into(),
+        vec![],
+    )
+    .await?;
+
+    let token = Arc::new(tokio::sync::RwLock::new(token));
+
+    let twitch_webhook_server = TwitchWebhookServer::new(subscription_manager, token);
+    let _ = twitch_webhook_server.start().await;
+
+    Ok(())
+}