rdzobot 0.1.0

Modular, but monolithic Matrix bot
Documentation 
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// SPDX-License-Identifier: AGPL-3.0-or-later
// SPDX-FileCopyrightText: 2025 Wojtek Porczyk <woju@hackerspace.pl>

// mostly stolen from https://github.com/matrix-org/matrix-rust-sdk/blob/main/examples/emoji_verification/src/main.rs

use std::io::Write;

use futures_util::stream::StreamExt;

use matrix_sdk::Client;
use matrix_sdk::config::SyncSettings;
use matrix_sdk::encryption::verification::{
    EmojiShortAuthString,
    SasState,
    SasVerification,
    Verification,
    VerificationRequestState,
    format_emojis,
};
use matrix_sdk::ruma::OwnedUserId;
use matrix_sdk::ruma::api::client::filter::FilterDefinition;
use matrix_sdk::ruma::events::key::verification::request::ToDeviceKeyVerificationRequestEvent;
use matrix_sdk::ruma::events::room::message::OriginalSyncRoomMessageEvent;

use rdzobot::Rdzobot;

async fn confirm_sas(
    sas_verification: SasVerification,
    emojis: Option<EmojiShortAuthString>,
    decimals: (u16, u16, u16),
) {
    print!(
        "confirm user_id {} device {} emojis\n{}\ndecimals {} {} {}? [y/N] ",
        sas_verification.other_device().user_id(),
        sas_verification.other_device().device_id(),
        if emojis.is_some() {
            format_emojis(emojis.unwrap().emojis)
        } else {
            "-".to_string()
        },
        decimals.0,
        decimals.1,
        decimals.2,
    );

    std::io::stdout().flush().expect("failed to flush stdout");
    let mut input = String::new();
    std::io::stdin().read_line(&mut input).expect("faile to read stdin");
    match input.trim().to_lowercase().as_ref() {
        "yes" | "y" => {
            sas_verification.confirm().await.expect("failed to confirm SAS verification")
        }
        _ => sas_verification.cancel().await.expect("failed to cancel SAS verification"),
    }
}

async fn sas_verification_handler(sas_verification: SasVerification) {
    sas_verification.accept().await.expect("can't accept sas verification request");
    let mut stream = sas_verification.changes();

    /*
     * see
     * https://docs.rs/matrix-sdk/latest/matrix_sdk/encryption/verification/struct.SasVerification.html#method.changes
     * for FSM
     */
    while let Some(state) = stream.next().await {
        match state {
            SasState::KeysExchanged { emojis, decimals } => {
                tokio::spawn(confirm_sas(sas_verification.clone(), emojis, decimals));
            }

            SasState::Done { .. } => {
                let device = sas_verification.other_device();
                println!(
                    "Successfully verified device {} {} {:?}",
                    device.user_id(),
                    device.device_id(),
                    device.local_trust_state(),
                );
            }

            | SasState::Created { .. }
            | SasState::Started { .. }
            | SasState::Accepted { .. }
            | SasState::Confirmed
            | SasState::Cancelled { .. } => (),
        }
    }
}

#[rustfmt::skip]
async fn request_verification_handler(client: Client, sender: OwnedUserId, flow_id: String) {
    let request = client
        .encryption()
        .get_verification_request(&sender, flow_id)
        .await
        .expect("request object wasn't created");

    request.accept().await.expect("can't accept verification request");
    let mut stream = request.changes();

    while let Some(state) = stream.next().await {
        match state {
            | VerificationRequestState::Created { .. }
            | VerificationRequestState::Requested { .. }
            | VerificationRequestState::Ready { .. } => (),

            VerificationRequestState::Transitioned { verification } => {
                if let Verification::SasV1(sas_verification) = verification {
                    tokio::spawn(sas_verification_handler(sas_verification));
                }
            }

            | VerificationRequestState::Done
            | VerificationRequestState::Cancelled(_) => break,
        }
    }
}

async fn on_verification_request(event: ToDeviceKeyVerificationRequestEvent, client: Client) {
    tokio::spawn(request_verification_handler(
        client,
        event.sender.clone(),
        event.content.transaction_id.to_string(),
    ));
}

async fn on_message_verification_request(event: OriginalSyncRoomMessageEvent, client: Client) {
    tokio::spawn(request_verification_handler(
        client,
        event.sender.clone(),
        event.event_id.to_string(),
    ));
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    let bot = Rdzobot::new().await?;

    bot.client.add_event_handler(on_verification_request);
    bot.client.add_event_handler(on_message_verification_request);

    let sync_settings =
        SyncSettings::default().filter(FilterDefinition::with_lazy_loading().into());
    bot.client.sync(sync_settings).await?;

    Ok(())
}