matrix-bot/src/main.rs

#![warn(clippy::nursery, clippy::pedantic)]

use std::path::PathBuf;
use std::str::FromStr;
use std::time::Duration;

use anyhow::{Context, Result};
use clap::Parser;
use matrix_sdk::config::SyncSettings;
use matrix_sdk::room::{Joined, Room};
use matrix_sdk::ruma::events::room::member::StrippedRoomMemberEvent;
use matrix_sdk::ruma::events::room::message::{
    MessageType, RoomMessageEventContent, SyncRoomMessageEvent, TextMessageEventContent,
};
use matrix_sdk::ruma::events::{OriginalSyncMessageLikeEvent, SyncMessageLikeEvent};
use matrix_sdk::ruma::OwnedUserId;
use matrix_sdk::store::CryptoStore;
use matrix_sdk::{Client, Session};
use serde::{Deserialize, Serialize};
use tracing::{error, info, Level};
use tracing_subscriber::util::SubscriberInitExt;

use commands::*;

mod commands;

#[derive(Parser)]
struct Args {
    #[clap(subcommand)]
    subcommand: Command,
}

#[derive(Parser)]
enum Command {
    Login {
        user_id: OwnedUserId,
        password: String,
    },
    Run {
        #[clap(default_value = "config.toml")]
        config_path: PathBuf,
        #[clap(default_value = "crypto_data")]
        crypto_store_path: PathBuf,
    },
}

#[derive(Serialize, Deserialize)]
struct TomlConfig {
    session: Session,
}

#[tokio::main]
async fn main() -> Result<()> {
    tracing_subscriber::fmt()
        .with_max_level(Level::INFO)
        .finish()
        .init();
    let args = Args::parse();

    match args.subcommand {
        Command::Login { user_id, password } => handle_login(user_id, &password).await,
        Command::Run {
            config_path,
            crypto_store_path,
        } => handle_run(config_path, crypto_store_path).await,
    }
}

async fn handle_login(user_id: OwnedUserId, password: &str) -> Result<()> {
    let client = Client::builder().user_id(&user_id).build().await?;
    let resp = client
        .login(user_id.localpart(), password, None, None)
        .await?;

    info!("Config generated. Please store this somewhere (like config.toml)!");
    println!(
        "\n\n{}",
        toml::to_string_pretty(&TomlConfig {
            session: Session {
                access_token: resp.access_token,
                device_id: resp.device_id,
                user_id,
            }
        })?
    );

    Ok(())
}

async fn handle_run(config_path: PathBuf, crypto_store_path: PathBuf) -> Result<()> {
    let data = std::fs::read_to_string(config_path)?;
    let config: TomlConfig = toml::from_str(&data)?;

    let client = Client::builder()
        .user_id(&config.session.user_id)
        .crypto_store(Box::new(CryptoStore::open_with_passphrase(
            crypto_store_path,
            None,
        )?))
        .build()
        .await
        .context("s")?;
    client.restore_login(config.session.clone()).await?;

    info!(user = %config.session.user_id, device_id = %config.session.device_id, "Logged in");

    let sync_settings = SyncSettings::default();

    // Sync once before registering events to not double-send events on boot.
    client.sync_once(sync_settings.clone()).await?;

    client
        .register_event_handler(auto_join)
        .await
        .register_event_handler(on_room_message)
        .await;

    // Syncing is important to synchronize the client state with the server.
    // This method will never return.
    client.sync(sync_settings).await;

    Ok(())
}

async fn auto_join(room_member: StrippedRoomMemberEvent, client: Client, room: Room) -> Result<()> {
    if Some(room_member.sender) == client.user_id().await {
        return Ok(());
    }

    if let Room::Invited(room) = room {
        info!("Autojoining room {}", room.room_id());
        let mut delay = 2;

        while let Err(err) = room.accept_invitation().await {
            // retry autojoin due to synapse sending invites, before the
            // invited user can join for more information see
            // https://github.com/matrix-org/synapse/issues/4345
            error!(
                room_id = ?room.room_id(),
                ?err,
                "Failed to join room, retrying in {delay}s",
            );

            tokio::time::sleep(Duration::from_secs(delay)).await;
            delay *= 2;

            if delay > 3600 {
                error!(
                    room_id = ?room.room_id(),
                    ?err,
                    "Failed to join room. Giving up.",
                );
                break;
            }
        }

        info!(room_id = ?room.room_id(), "Successfully joined room.");
    }

    Ok(())
}

async fn on_room_message(event: SyncRoomMessageEvent, room: Room, client: Client) -> Result<()> {
    // Ignore messages sent from self.
    if client.user_id().await.as_deref() == Some(event.sender()) {
        return Ok(());
    }

    if let Room::Joined(room) = room {
        parse_message(event, room).await?;
    }

    Ok(())
}

async fn parse_message(event: SyncRoomMessageEvent, room: Joined) -> Result<()> {
    room.read_receipt(event.event_id()).await?;

    let message = match &event {
        SyncMessageLikeEvent::Original(OriginalSyncMessageLikeEvent {
            content:
                RoomMessageEventContent {
                    msgtype: MessageType::Text(TextMessageEventContent { body, .. }),
                    ..
                },
            ..
        }) => body.clone(),
        _ => return Ok(()),
    };

    if let Some(message) = message.strip_prefix('!') {
        let (command, args) = message.split_once(' ').unwrap_or((message, ""));
        match BotCommand::from_str(command).ok() {
            Some(BotCommand::Source) => source(room).await?,
            Some(BotCommand::Uwu) => uwuify(room, args).await?,
            Some(BotCommand::Ping) => ping(room).await?,
            Some(BotCommand::Help) => help(room).await?,
            _ => unsupported_command(event, room, command).await?,
        }
    }

    Ok(())
}

async fn unsupported_command(
    event: SyncRoomMessageEvent,
    room: Joined,
    command: &str,
) -> Result<()> {
    let event = if let SyncRoomMessageEvent::Original(event) = event {
        event.into_full_event(room.room_id().to_owned())
    } else {
        return Ok(());
    };
    let content =
        RoomMessageEventContent::notice_reply_plain(format!("Unknown command `{command}`"), &event);
    room.send(content, None).await?;
    Ok(())
}