RUFF/src/main.rs

use anyhow::{anyhow, bail, Context};
use jm_client_core::JMClient;
use log::{error, info, warn};
use matrix_sdk::{
    api::r0::session::login,
    async_trait,
    deserialized_responses::SyncResponse,
    events::{
        room::{
            member::MemberEventContent,
            message::{MessageEventContent, MessageType, TextMessageEventContent},
        },
        AnyToDeviceEvent, StrippedStateEvent, SyncMessageEvent,
    },
    room::Room,
    verification::Verification,
    EventHandler, LoopCtrl,
};
use rand::{rngs::StdRng, SeedableRng};
use sled::Db;
use std::{
    collections::BTreeMap,
    path::PathBuf,
    sync::{
        atomic::{AtomicBool, AtomicU32},
        Arc,
    },
    time::Duration,
};
use structopt::StructOpt;
use tokio::sync::Mutex;
use tokio::sync::RwLock;

use config::Config;

use matrix_sdk::{self, api::r0::uiaa::AuthData, identifiers::UserId, Client, SyncSettings};
use serde_json::json;
mod config;
mod meme;
mod responder;

#[derive(Debug, StructOpt)]
struct Opt {
    #[structopt(
        short,
        long,
        help = "config file to use",
        default_value = "~/.config/ruff/config.toml"
    )]
    config: PathBuf,
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    env_logger::init();

    let opt = Opt::from_args();
    let config = std::fs::read(&opt.config).map_err(|e| anyhow!("Error reading config: {}", e))?;
    let config =
        toml::from_slice::<Config>(&config).map_err(|e| anyhow!("Error parsing config: {}", e))?;
    let config = Arc::new(config);

    let client = Arc::new(RwLock::new(Client::new(config.homeserver_url.clone())?));

    let device_name = config.device_name.as_ref().map(String::as_ref);
    let login::Response { user_id, .. } = client
        .read()
        .await
        .login(&config.user_id, &config.password, device_name, device_name)
        .await?;

    client
        .write()
        .await
        .set_event_handler(Box::new(Bot {
            client: Arc::clone(&client),
            jm_client: RwLock::new(JMClient::new()),
            memecache: sled::open(config.store_path.join("memecache"))
                .map_err(|e| anyhow!("error opening memecache: {}", e))?,
            config: Arc::clone(&config),
            meme_count: AtomicU32::new(0),
            rng: Mutex::new(StdRng::from_rng(rand::thread_rng())?),
        }))
        .await;

    let initial = AtomicBool::from(true);
    let initial_ref = &initial;
    let client_ref = &client.read().await;
    let config_ref = &config;
    let user_id_ref = &user_id;
    client
        .read()
        .await
        .sync_with_callback(SyncSettings::new(), |response| async move {
            if let Err(e) = on_response(&response, client_ref).await {
                error!("Error processing response: {}", e);
            }

            let initial = initial_ref;

            if initial.load(std::sync::atomic::Ordering::SeqCst) {
                if let Err(e) =
                    on_initial_response(client_ref, &user_id_ref, &config_ref.password).await
                {
                    error!("Error processing initial response: {}", e);
                }

                initial.store(false, std::sync::atomic::Ordering::SeqCst);
            }

            LoopCtrl::Continue
        })
        .await;

    Ok(())
}

pub struct Bot {
    client: Arc<RwLock<Client>>,
    jm_client: RwLock<JMClient>,
    memecache: Db,
    config: Arc<Config>,
    /// used to keep track of how many memes have been sent.
    /// this is reset once the threshold set in the config has been reached, and the JMClient cache
    /// is cleared.
    meme_count: AtomicU32,
    rng: Mutex<StdRng>,
}

#[async_trait]
impl EventHandler for Bot {
    async fn on_stripped_state_member(
        &self,
        room: Room,
        room_member: &StrippedStateEvent<MemberEventContent>,
        _: Option<MemberEventContent>,
    ) {
        if room_member.state_key == self.client.read().await.user_id().await.unwrap() {
            return;
        }

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

            while let Err(err) = self
                .client
                .read()
                .await
                .join_room_by_id(&room.room_id())
                .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
                warn!(
                    "Failed to join room {} ({:?}), retrying in {}s",
                    room.room_id(),
                    err,
                    delay
                );

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

                if delay > 3600 {
                    error!("Can't join room {} ({:?})", room.room_id(), err);
                    break;
                }
            }

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

    async fn on_room_message(&self, room: Room, msg: &SyncMessageEvent<MessageEventContent>) {
        if self
            .client
            .read()
            .await
            .user_id()
            .await
            .map(|u| u == msg.sender)
            .unwrap_or(true)
        {
            return;
        }

        if let SyncMessageEvent {
            content:
                MessageEventContent {
                    msgtype: MessageType::Text(TextMessageEventContent { body: msg_body, .. }),
                    ..
                },
            ..
        } = msg
        {
            if let Err(e) = responder::on_msg(msg_body, room, self).await {
                error!("Responder error: {}", e);
            }
        }
    }
}

async fn on_initial_response(
    client: &Client,
    user_id: &UserId,
    password: &str,
) -> anyhow::Result<()> {
    bootstrap_cross_signing(client, user_id, password).await?;

    Ok(())
}

async fn on_response(response: &SyncResponse, client: &Client) -> anyhow::Result<()> {
    for event in response
        .to_device
        .events
        .iter()
        .filter_map(|e| e.deserialize().ok())
    {
        match event {
            AnyToDeviceEvent::KeyVerificationStart(e) => {
                info!("Starting verification");
                if let Some(Verification::SasV1(sas)) = &client
                    .get_verification(&e.sender, &e.content.transaction_id)
                    .await
                {
                    if let Err(e) = sas.accept().await {
                        error!("Error accepting key verification request: {}", e);
                    }
                }
            }

            AnyToDeviceEvent::KeyVerificationKey(e) => {
                if let Some(Verification::SasV1(sas)) = &client
                    .get_verification(&e.sender, &e.content.transaction_id)
                    .await
                {
                    if let Err(e) = sas.confirm().await {
                        error!("Error confirming key verification request: {}", e);
                    }
                }
            }

            _ => {}
        }
    }

    Ok(())
}

fn auth_data<'a>(user: &UserId, password: &str, session: Option<&'a str>) -> AuthData<'a> {
    let mut auth_parameters = BTreeMap::new();
    let identifier = json!({
        "type": "m.id.user",
        "user": user,
    });

    auth_parameters.insert("identifier".to_owned(), identifier);
    auth_parameters.insert("password".to_owned(), password.to_owned().into());

    AuthData::DirectRequest {
        kind: "m.login.password",
        auth_parameters,
        session,
    }
}

async fn bootstrap_cross_signing(
    client: &Client,
    user_id: &UserId,
    password: &str,
) -> anyhow::Result<()> {
    info!("bootstrapping e2e");
    if let Err(e) = client.bootstrap_cross_signing(None).await {
        warn!("couldnt bootstrap e2e without auth data");
        if let Some(response) = e.uiaa_response() {
            let auth_data = auth_data(&user_id, &password, response.session.as_deref());
            client
                .bootstrap_cross_signing(Some(auth_data))
                .await
                .context("Couldn't bootstrap cross signing")?;
            info!("bootstrapped e2e with auth data");
        } else {
            bail!("Error during cross-signing bootstrap {:#?}", e);
        }
    }

    Ok(())
}