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    #![feature(proc_macro_hygiene, decl_macro)]
    
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    mod data;
    
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    mod ruma_wrapper;
    
    mod utils;
    
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    pub use data::Data;
    
    pub use database::Database;
    
    
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    use log::debug;
    
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    use rocket::{get, options, post, put, routes, State};
    
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    use ruma_client_api::{
        error::{Error, ErrorKind},
        r0::{
            account::register, alias::get_alias, membership::join_room_by_id,
    
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            message::create_message_event, session::login, sync::sync_events,
    
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        unversioned::get_supported_versions,
    
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    };
    
    use ruma_events::{collections::all::Event, room::message::MessageEvent};
    
    use ruma_identifiers::{EventId, UserId};
    
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    use ruma_wrapper::{MatrixResult, Ruma};
    
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    use serde_json::map::Map;
    
    use std::{
        collections::HashMap,
        convert::{TryFrom, TryInto},
    
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        path::PathBuf,
    
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    #[get("/_matrix/client/versions")]
    fn get_supported_versions_route() -> MatrixResult<get_supported_versions::Response> {
        MatrixResult(Ok(get_supported_versions::Response {
    
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            versions: vec!["r0.6.0".to_owned()],
    
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            unstable_features: HashMap::new(),
    
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    #[post("/_matrix/client/r0/register", data = "<body>")]
    
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    fn register_route(
    
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        data: State<Data>,
    
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        body: Ruma<register::Request>,
    ) -> MatrixResult<register::Response> {
    
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        // Validate user id
    
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        let user_id: UserId = match (*format!(
    
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            "@{}:{}",
            body.username.clone().unwrap_or("randomname".to_owned()),
            data.hostname()
    
        ))
        .try_into()
        {
            Err(_) => {
    
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                debug!("Username invalid");
    
                return MatrixResult(Err(Error {
                    kind: ErrorKind::InvalidUsername,
    
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                    message: "Username was invalid.".to_owned(),
    
                    status_code: http::StatusCode::BAD_REQUEST,
    
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                }));
    
            }
            Ok(user_id) => user_id,
        };
    
    
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        // Check if username is creative enough
    
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        if data.user_exists(&user_id) {
    
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            debug!("ID already taken");
    
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            return MatrixResult(Err(Error {
                kind: ErrorKind::UserInUse,
                message: "Desired user ID is already taken.".to_owned(),
                status_code: http::StatusCode::BAD_REQUEST,
            }));
        }
    
    
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        // Create user
        data.user_add(&user_id, body.password.clone());
    
        // Generate new device id if the user didn't specify one
        let device_id = body
            .device_id
            .clone()
            .unwrap_or_else(|| "TODO:randomdeviceid".to_owned());
    
        // Add device
        data.device_add(&user_id, &device_id);
    
        // Generate new token for the device
        let token = "TODO:randomtoken".to_owned();
        data.token_replace(&user_id, &device_id, token.clone());
    
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        MatrixResult(Ok(register::Response {
    
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            access_token: token,
    
            home_server: data.hostname().to_owned(),
    
            user_id,
    
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            device_id,
    
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    #[post("/_matrix/client/r0/login", data = "<body>")]
    
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    fn login_route(data: State<Data>, body: Ruma<login::Request>) -> MatrixResult<login::Response> {
    
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        // Validate login method
        let user_id =
            if let (login::UserInfo::MatrixId(mut username), login::LoginInfo::Password { password }) =
                (body.user.clone(), body.login_info.clone())
            {
                if !username.contains(':') {
                    username = format!("@{}:{}", username, data.hostname());
                }
                if let Ok(user_id) = (*username).try_into() {
                    if !data.user_exists(&user_id) {}
    
                    // Check password
                    if let Some(correct_password) = data.password_get(&user_id) {
                        if password == correct_password {
                            // Success!
                            user_id
                        } else {
                            debug!("Invalid password.");
                            return MatrixResult(Err(Error {
                                kind: ErrorKind::Unknown,
                                message: "".to_owned(),
                                status_code: http::StatusCode::FORBIDDEN,
                            }));
                        }
                    } else {
                        debug!("UserId does not exist (has no assigned password). Can't log in.");
                        return MatrixResult(Err(Error {
                            kind: ErrorKind::Forbidden,
                            message: "".to_owned(),
                            status_code: http::StatusCode::FORBIDDEN,
                        }));
                    }
                } else {
                    debug!("Invalid UserId.");
    
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                    return MatrixResult(Err(Error {
    
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                        kind: ErrorKind::Unknown,
                        message: "Bad login type.".to_owned(),
    
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                        status_code: http::StatusCode::BAD_REQUEST,
                    }));
                }
            } else {
    
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                debug!("Bad login type");
    
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                return MatrixResult(Err(Error {
    
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                    kind: ErrorKind::Unknown,
                    message: "Bad login type.".to_owned(),
    
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                    status_code: http::StatusCode::BAD_REQUEST,
                }));
    
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            };
    
        // Generate new device id if the user didn't specify one
        let device_id = body
            .device_id
            .clone()
            .unwrap_or("TODO:randomdeviceid".to_owned());
    
    
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        data.device_add(&user_id, &device_id);
    
        // Generate a new token for the device
        let token = "TODO:randomtoken".to_owned();
        data.token_replace(&user_id, &device_id, token.clone());
    
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        return MatrixResult(Ok(login::Response {
    
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            user_id,
            access_token: token,
    
            home_server: Some(data.hostname().to_owned()),
    
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            device_id,
    
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            well_known: None,
        }));
    }
    
    
    #[get("/_matrix/client/r0/directory/room/<room_alias>")]
    fn get_alias_route(room_alias: String) -> MatrixResult<get_alias::Response> {
    
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        // TODO
    
        let room_id = match &*room_alias {
            "#room:localhost" => "!xclkjvdlfj:localhost",
            _ => {
    
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                debug!("Room not found.");
    
                return MatrixResult(Err(Error {
                    kind: ErrorKind::NotFound,
                    message: "Room not found.".to_owned(),
                    status_code: http::StatusCode::NOT_FOUND,
    
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                }));
    
            }
        }
        .try_into()
        .unwrap();
    
        MatrixResult(Ok(get_alias::Response {
            room_id,
            servers: vec!["localhost".to_owned()],
        }))
    }
    
    #[post("/_matrix/client/r0/rooms/<_room_id>/join", data = "<body>")]
    fn join_room_by_id_route(
        _room_id: String,
        body: Ruma<join_room_by_id::Request>,
    ) -> MatrixResult<join_room_by_id::Response> {
    
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        // TODO
    
        MatrixResult(Ok(join_room_by_id::Response {
            room_id: body.room_id.clone(),
        }))
    }
    
    #[put(
        "/_matrix/client/r0/rooms/<_room_id>/send/<_event_type>/<_txn_id>",
        data = "<body>"
    )]
    fn create_message_event_route(
    
        data: State<Data>,
    
        _room_id: String,
        _event_type: String,
        _txn_id: String,
    
        body: Ruma<create_message_event::Request>,
    
    ) -> MatrixResult<create_message_event::Response> {
    
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        // Construct event
    
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        let mut event = Event::RoomMessage(MessageEvent {
    
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            content: body.data.clone().into_result().unwrap(),
    
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            event_id: EventId::try_from("$thiswillbefilledinlater").unwrap(),
    
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            origin_server_ts: utils::millis_since_unix_epoch(),
            room_id: Some(body.room_id.clone()),
            sender: body.user_id.clone().expect("user is authenticated"),
            unsigned: Map::default(),
        });
    
    
        // Generate event id
    
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        let event_id = EventId::try_from(&*format!(
            "${}",
            ruma_signatures::reference_hash(&serde_json::to_value(&event).unwrap())
                .expect("ruma can calculate reference hashes")
        ))
        .expect("ruma's reference hashes are correct");
    
        // Insert event id
        if let Event::RoomMessage(message) = &mut event {
            message.event_id = event_id.clone();
        }
    
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        // Add PDU to the graph
        data.pdu_append(&event_id, &body.room_id, event);
    
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        MatrixResult(Ok(create_message_event::Response { event_id }))
    
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    }
    
    
    #[get("/_matrix/client/r0/sync", data = "<body>")]
    fn sync_route(
        data: State<Data>,
        body: Ruma<sync_events::Request>,
    ) -> MatrixResult<sync_events::Response> {
    
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        let pdus = data.pdus_all();
        let mut joined_rooms = HashMap::new();
        joined_rooms.insert(
            "!roomid:localhost".try_into().unwrap(),
            sync_events::JoinedRoom {
                account_data: sync_events::AccountData { events: Vec::new() },
                summary: sync_events::RoomSummary {
                    heroes: Vec::new(),
                    joined_member_count: None,
                    invited_member_count: None,
                },
                unread_notifications: sync_events::UnreadNotificationsCount {
                    highlight_count: None,
                    notification_count: None,
                },
                timeline: sync_events::Timeline {
                    limited: None,
                    prev_batch: None,
                    events: todo!(),
                },
                state: sync_events::State { events: Vec::new() },
                ephemeral: sync_events::Ephemeral { events: Vec::new() },
            },
        );
    
        MatrixResult(Ok(sync_events::Response {
            next_batch: String::new(),
            rooms: sync_events::Rooms {
                leave: Default::default(),
                join: joined_rooms,
                invite: Default::default(),
            },
            presence: sync_events::Presence { events: Vec::new() },
            device_lists: Default::default(),
            device_one_time_keys_count: Default::default(),
            to_device: sync_events::ToDevice { events: Vec::new() },
        }))
    }
    
    #[options("/<_segments..>")]
    fn options_route(_segments: PathBuf) -> MatrixResult<create_message_event::Response> {
        MatrixResult(Err(Error {
            kind: ErrorKind::NotFound,
            message: "Room not found.".to_owned(),
            status_code: http::StatusCode::NOT_FOUND,
        }))
    }
    
    
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    fn main() {
    
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        // Log info by default
        if let Err(_) = std::env::var("RUST_LOG") {
    
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            std::env::set_var("RUST_LOG", "matrixserver=debug,info");
    
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        pretty_env_logger::init();
    
        let data = Data::load_or_create("localhost");
        data.debug();
    
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        rocket::ignite()
    
            .mount(
                "/",
                routes![
                    get_supported_versions_route,
                    register_route,
    
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                    login_route,
    
                    get_alias_route,
                    join_room_by_id_route,
                    create_message_event_route,
    
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                    sync_route,
                    options_route,
    
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            .manage(data)
    
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            .launch();
    }