feat: Send sus alert via telegram

Signed-off-by: Awiteb <a@4rs.nl>

locales/ar-sa.toml

@@ -0,0 +1,22 @@
+[messages]
+help_start = "مرحبًا، أنا حارس فورجيو، سأرسل لك إشعارًا حول المستخدمين المشبوهين، وسأنتظر موافقتك أو رفضك لحظرهم.\n\nالشيفرة المصدرية الخاصة بي: https://git.4rs.nl/awiteb/forgejo-guardian"
+sus_alert = """تم اكتشاف مستخدم مشبوه! 🚨
+• معرف المستخدم: %{user_id}
+• اسم المستخدم: %{username}
+• الاسم الكامل: %{full_name}
+• النبذة: %{bio}
+• الموقع: %{website}
+• الملف التعريفي: %{profile}
+
+هل تريد حظر هذا المستخدم؟
+"""
+ban_success = "تم حظر المستخدم بنجاح ⛔"
+ban_failed = "فشل حظر المستخدم! ⚠️"
+ban_denied = "تم تجاهل المستخدم ⚠️"
+
+[words]
+not_found = "غير موجود"
+
+[buttons]
+ban    = "حظر ⛔"
+ignore = "تجاهل ⚠️"

locales/en-us.toml

@@ -0,0 +1,22 @@
+[messages]
+help_start = "Hi, I'm forgejo-guardian, I'll send you a notification about suspicious users, and I'll wait for your approval or rejection to ban them.\n\nMy source code: https://git.4rs.nl/awiteb/forgejo-guardian"
+sus_alert = """Suspicious user detected! 🚨
+• User ID: %{user_id}
+• Username: %{username}
+• Full name: %{full_name}
+• Bio: %{bio}
+• Website: %{website}
+• Profile: %{profile}
+
+Do you want to ban this user?
+"""
+ban_success = "User has been banned successfully ⛔"
+ban_failed = "Failed to ban the user! ⚠️"
+ban_denied = "User has been ignored ⚠️"
+
+[words]
+not_found = "Not found"
+
+[buttons]
+ban    = "Ban ⛔"
+ignore = "Ignore ⚠️"

src/main.rs

@@ -14,6 +14,9 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program. If not, see <https://gnu.org/licenses/agpl.txt>.
 
+#[macro_use]
+extern crate rust_i18n;
+
 use std::{process::ExitCode, sync::Arc, time::Duration};
 
 use tokio::{signal::ctrl_c, sync};
@@ -22,27 +25,36 @@ use tokio_util::sync::CancellationToken;
 pub mod config;
 pub mod error;
 pub mod forgejo_api;
+pub mod telegram_bot;
 pub mod traits;
 pub mod users_fetcher;
 pub mod utils;
 
+i18n!("locales", fallback = "en-us");
+
 async fn try_main() -> error::GuardResult<()> {
     let config = Arc::new(utils::get_config()?);
     let cancellation_token = CancellationToken::new();
     // Suspicious users are sent and received in this channel, users who meet the
     // `alert` expressions
-    let (sus_sender, _sus_receiver) = sync::mpsc::channel::<forgejo_api::ForgejoUser>(100);
+    let (sus_sender, sus_receiver) = sync::mpsc::channel::<forgejo_api::ForgejoUser>(100);
 
     tracing::info!("The instance: {}", config.forgejo.instance);
     tracing::debug!("The config exprs: {:#?}", config.expressions);
 
+    rust_i18n::set_locale(config.telegram.lang.as_str());
+
     tokio::spawn(users_fetcher::users_fetcher(
         Arc::clone(&config),
         cancellation_token.clone(),
         sus_sender.clone(),
     ));
 
-    // TODO: Sus worker, who will receive sus users
+    tokio::spawn(telegram_bot::start_bot(
+        Arc::clone(&config),
+        cancellation_token.clone(),
+        sus_receiver,
+    ));
 
     tokio::select! {
         _ = ctrl_c() => {

src/telegram_bot/callback_handler.rs

@@ -0,0 +1,92 @@
+// Simple Forgejo instance guardian, banning users and alerting admins based on
+// certain regular expressions. Copyright (C) 2024 Awiteb <a@4rs.nl>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <https://gnu.org/licenses/agpl.txt>.
+
+use std::sync::Arc;
+
+use reqwest::Client;
+use teloxide::{
+    prelude::*,
+    types::{
+        CallbackQuery,
+        InlineKeyboardButton,
+        InlineKeyboardButtonKind,
+        InlineKeyboardMarkup,
+        MaybeInaccessibleMessage,
+    },
+};
+
+use crate::{config::Config, forgejo_api};
+
+/// Inline keyboard with a single button that links to the Forgejo Guardian repository.
+fn source_inline_keyboard(text: &str) -> InlineKeyboardMarkup {
+    InlineKeyboardMarkup::new([[InlineKeyboardButton::new(
+        text,
+        InlineKeyboardButtonKind::Url(
+            url::Url::parse("https://git.4rs.nl/awiteb/forgejo-guardian").expect("Valid url"),
+        ),
+    )]])
+}
+
+/// Handle callback queries from the inline keyboard.
+pub async fn callback_handler(
+    bot: Bot,
+    callback_query: CallbackQuery,
+    config: Arc<Config>,
+) -> ResponseResult<()> {
+    let Some(callback_data) = callback_query.data else {
+        return Ok(());
+    };
+
+    let Some((command, data)) = callback_data.split_once(' ') else {
+        // Invalid callback data
+        return Ok(());
+    };
+
+    match command {
+        "b" => {
+            // ban the user
+            let button_text = if forgejo_api::ban_user(
+                &Client::new(),
+                &config.forgejo.instance,
+                &config.forgejo.token,
+                data,
+            )
+            .await
+            .is_ok()
+            {
+                t!("messages.ban_success")
+            } else {
+                t!("messages.ban_failed")
+            };
+
+            if let Some(MaybeInaccessibleMessage::Regular(msg)) = callback_query.message {
+                bot.edit_message_reply_markup(msg.chat.id, msg.id)
+                    .reply_markup(source_inline_keyboard(&button_text))
+                    .await?;
+            }
+        }
+        "ignore" => {
+            if let Some(MaybeInaccessibleMessage::Regular(msg)) = callback_query.message {
+                bot.edit_message_reply_markup(msg.chat.id, msg.id)
+                    .reply_markup(source_inline_keyboard(&t!("messages.ban_denied")))
+                    .await?;
+            }
+        }
+        _ => {}
+    };
+
+    Ok(())
+}

src/telegram_bot/message_handler.rs

@@ -0,0 +1,52 @@
+// Simple Forgejo instance guardian, banning users and alerting admins based on
+// certain regular expressions. Copyright (C) 2024 Awiteb <a@4rs.nl>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <https://gnu.org/licenses/agpl.txt>.
+
+use teloxide::{
+    prelude::*,
+    types::{Me, ReplyParameters},
+    utils::command::BotCommands,
+};
+
+#[derive(BotCommands, Clone, Debug, PartialEq)]
+#[command(rename_rule = "lowercase")]
+enum Command {
+    Start,
+    #[command(aliases = ["h", "?"])]
+    Help,
+}
+
+/// Help and start commands handler
+pub async fn help_start_handler(bot: &Bot, msg: &Message) -> ResponseResult<()> {
+    bot.send_message(msg.chat.id, t!("messages.help_start"))
+        .reply_parameters(ReplyParameters::new(msg.id))
+        .await?;
+
+    Ok(())
+}
+
+/// Handle text messages
+pub async fn text_handler(bot: Bot, me: Me, msg: Message) -> ResponseResult<()> {
+    let text = msg.text().expect("Is a text handler");
+    let Ok(command) = Command::parse(text, me.username()) else {
+        return Ok(());
+    };
+
+    match command {
+        Command::Help | Command::Start => help_start_handler(&bot, &msg).await?,
+    };
+
+    Ok(())
+}

src/telegram_bot/mod.rs

@@ -0,0 +1,80 @@
+// Simple Forgejo instance guardian, banning users and alerting admins based on
+// certain regular expressions. Copyright (C) 2024 Awiteb <a@4rs.nl>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <https://gnu.org/licenses/agpl.txt>.
+
+//! Telegram bot module, to alert the admins of the bot of any suspicious users.
+
+mod callback_handler;
+mod message_handler;
+mod sus_handler;
+
+use std::sync::Arc;
+
+use callback_handler::callback_handler;
+use serde::Deserialize;
+use teloxide::{dispatching::UpdateFilterExt, prelude::*};
+use tokio::sync::mpsc::Receiver;
+use tokio_util::sync::CancellationToken;
+
+use crate::{config::Config, forgejo_api::ForgejoUser};
+
+/// Language of the telegram bot
+#[derive(Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum Lang {
+    EnUs,
+    ArSa,
+}
+
+impl Lang {
+    /// Get the language as a string
+    pub fn as_str(&self) -> &str {
+        match self {
+            Lang::EnUs => "en-us",
+            Lang::ArSa => "ar-sa",
+        }
+    }
+}
+
+/// Start the telegram bot
+pub async fn start_bot(
+    config: Arc<Config>,
+    cancellation_token: CancellationToken,
+    sus_receiver: Receiver<ForgejoUser>,
+) {
+    tracing::info!("Starting the telegram bot");
+
+    let bot = Bot::new(&config.telegram.token);
+    let handler = dptree::entry()
+        .branch(
+            Update::filter_message()
+                .branch(Message::filter_text().endpoint(message_handler::text_handler)),
+        )
+        .branch(Update::filter_callback_query().endpoint(callback_handler));
+
+    tokio::spawn(sus_handler::sus_users_handler(
+        bot.clone(),
+        Arc::clone(&config),
+        cancellation_token,
+        sus_receiver,
+    ));
+
+    Dispatcher::builder(bot, handler)
+        .dependencies(dptree::deps![config])
+        .enable_ctrlc_handler()
+        .build()
+        .dispatch()
+        .await;
+}

src/telegram_bot/sus_handler.rs

@@ -0,0 +1,93 @@
+// Simple Forgejo instance guardian, banning users and alerting admins based on
+// certain regular expressions. Copyright (C) 2024 Awiteb <a@4rs.nl>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <https://gnu.org/licenses/agpl.txt>.
+
+use std::{borrow::Cow, sync::Arc};
+
+use teloxide::{
+    prelude::*,
+    types::{InlineKeyboardButton, InlineKeyboardButtonKind, InlineKeyboardMarkup, InputFile},
+};
+use tokio::sync::mpsc::Receiver;
+use tokio_util::sync::CancellationToken;
+
+use crate::{config::Config, forgejo_api::ForgejoUser};
+
+/// Create an inline keyboard of the suspicious user
+fn make_sus_inline_keyboard(sus_user: &ForgejoUser) -> InlineKeyboardMarkup {
+    let button = |text: &str, callback: String| {
+        InlineKeyboardButton::new(text, InlineKeyboardButtonKind::CallbackData(callback))
+    };
+
+    InlineKeyboardMarkup::new([[
+        button(
+            t!("buttons.ban").as_ref(),
+            format!("b {}", sus_user.username),
+        ),
+        button(t!("buttons.ignore").as_ref(), "ignore -".to_owned()),
+    ]])
+}
+
+fn not_found_if_empty(text: &str) -> Cow<'_, str> {
+    if text.is_empty() {
+        t!("words.not_found")
+    } else {
+        Cow::Borrowed(text)
+    }
+}
+
+/// Send a suspicious user alert to the admins
+pub async fn send_sus_alert(
+    bot: &Bot,
+    sus_user: ForgejoUser,
+    config: &Config,
+) -> ResponseResult<()> {
+    let keyboard = make_sus_inline_keyboard(&sus_user);
+
+    bot.send_photo(config.telegram.chat, InputFile::url(sus_user.avatar_url))
+        .caption(t!(
+            "messages.sus_alert",
+            user_id = sus_user.id,
+            username = sus_user.username,
+            full_name = not_found_if_empty(&sus_user.full_name),
+            bio = not_found_if_empty(&sus_user.biography),
+            website = not_found_if_empty(&sus_user.website),
+            profile = sus_user.html_url,
+        ))
+        .reply_markup(keyboard)
+        .await?;
+
+    Ok(())
+}
+
+/// Handle the suspicious users
+pub async fn sus_users_handler(
+    bot: Bot,
+    config: Arc<Config>,
+    cancellation_token: CancellationToken,
+    mut sus_receiver: Receiver<ForgejoUser>,
+) {
+    loop {
+        tokio::select! {
+            Some(sus_user) = sus_receiver.recv() => {
+                send_sus_alert(&bot, sus_user, &config).await.ok();
+            }
+            _ = cancellation_token.cancelled() => {
+                tracing::info!("sus users handler has been stopped successfully.");
+                break;
+            }
+        }
+    }
+}