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forwarder.rs
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forwarder.rs
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use std::convert::TryFrom;
use std::time::{SystemTime, UNIX_EPOCH};
use diesel::Connection;
use diesel::sqlite::SqliteConnection;
use ruma_identifiers::{RoomId, UserId};
use slog::Logger;
use api::MatrixApi;
use api::rocketchat::Message;
use config::Config;
use db::{NewUser, NewUserInRoom, NewUserOnRocketchatServer, RocketchatServer, Room, User, UserInRoom, UserOnRocketchatServer};
use errors::*;
use i18n::DEFAULT_LANGUAGE;
const RESEND_THRESHOLD_IN_SECONDS: i64 = 3;
/// Forwards messages from Rocket.Chat to Matrix
pub struct Forwarder<'a> {
/// Application service configuration
pub config: &'a Config,
/// SQL database connection
pub connection: &'a SqliteConnection,
/// Logger context
pub logger: &'a Logger,
/// Matrix REST API
pub matrix_api: &'a Box<MatrixApi>,
}
impl<'a> Forwarder<'a> {
/// Send a message to the Matrix channel.
pub fn send(&self, rocketchat_server: &RocketchatServer, message: &Message) -> Result<()> {
let user_on_rocketchat_server = match UserOnRocketchatServer::find_by_rocketchat_user_id(self.connection,
rocketchat_server.id,
message.user_id.clone(),
true)? {
Some(user_on_rocketchat_server) => user_on_rocketchat_server,
None => {
self.connection.transaction(|| self.create_virtual_user_on_rocketchat_server(rocketchat_server.id, message))?
}
};
if !self.is_sendable_message(&user_on_rocketchat_server)? {
debug!(self.logger,
"Skipping message, because the message was just posted by the user Matrix and echoed back from Rocket.Chat");
return Ok(());
}
let matrix_room_id =
match Room::find_by_rocketchat_room_id(self.connection, rocketchat_server.id, message.channel_id.clone())? {
Some(ref room) if room.is_bridged => room.matrix_room_id.clone(),
_ => {
debug!(self.logger,
"Ignoring message from Rocket.Chat channel `{}`, because the channel is not bridged.",
message.channel_id);
return Ok(());
}
};
if Some(message.user_name.clone()) != user_on_rocketchat_server.rocketchat_username.clone() {
self.connection
.transaction(|| {
user_on_rocketchat_server.set_rocketchat_username(self.connection,
Some(message.user_name.clone()))?;
self.matrix_api.set_display_name(user_on_rocketchat_server.matrix_user_id.clone(),
message.user_name.clone())
})?;
}
let user_in_room = UserInRoom::find_by_matrix_user_id_and_matrix_room_id(self.connection,
&user_on_rocketchat_server.matrix_user_id,
&matrix_room_id)?;
if user_in_room.is_none() {
self.add_virtual_user_to_room(user_on_rocketchat_server.matrix_user_id.clone(), matrix_room_id.clone())?;
}
self.matrix_api.send_text_message_event(matrix_room_id, user_on_rocketchat_server.matrix_user_id, message.text.clone())
}
fn create_virtual_user_on_rocketchat_server(&self,
rocketchat_server_id: i32,
message: &Message)
-> Result<UserOnRocketchatServer> {
let user_id_local_part = format!("{}_{}_{}", self.config.sender_localpart, message.user_id, rocketchat_server_id);
let user_id = format!("@{}:{}", user_id_local_part, self.config.hs_domain);
let matrix_user_id = UserId::try_from(&user_id).chain_err(|| ErrorKind::InvalidUserId(user_id))?;
let new_user = NewUser {
language: DEFAULT_LANGUAGE,
matrix_user_id: matrix_user_id.clone(),
};
User::insert(self.connection, &new_user)?;
let new_user_on_rocketchat_server = NewUserOnRocketchatServer {
is_virtual_user: true,
matrix_user_id: matrix_user_id,
rocketchat_auth_token: None,
rocketchat_server_id: rocketchat_server_id,
rocketchat_user_id: Some(message.user_id.clone()),
rocketchat_username: Some(message.user_name.clone()),
};
let user_on_rocketchat_server = UserOnRocketchatServer::upsert(self.connection, &new_user_on_rocketchat_server)?;
self.matrix_api.register(user_id_local_part.clone())?;
if let Err(err) = self.matrix_api.set_display_name(user_on_rocketchat_server.matrix_user_id.clone(),
message.user_name.clone()) {
info!(self.logger,
format!("Setting display name `{}`, for user `{}` failed with {}",
&user_on_rocketchat_server.matrix_user_id,
&message.user_name,
err));
}
Ok(user_on_rocketchat_server)
}
fn add_virtual_user_to_room(&self, matrix_user_id: UserId, matrix_room_id: RoomId) -> Result<()> {
self.matrix_api.invite(matrix_room_id.clone(), matrix_user_id.clone())?;
self.matrix_api.join(matrix_room_id.clone(), matrix_user_id.clone())?;
let new_user_in_room = NewUserInRoom {
matrix_user_id: matrix_user_id,
matrix_room_id: matrix_room_id,
};
UserInRoom::insert(self.connection, &new_user_in_room)?;
Ok(())
}
fn is_sendable_message(&self, virtual_user_on_rocketchat_server: &UserOnRocketchatServer) -> Result<bool> {
match UserOnRocketchatServer::find_by_rocketchat_user_id(self.connection,
virtual_user_on_rocketchat_server.rocketchat_server_id,
virtual_user_on_rocketchat_server.rocketchat_user_id
.clone()
.unwrap_or_default(),
false)? {
Some(user_on_rocketchat_server) => {
let user = user_on_rocketchat_server.user(self.connection)?;
let now =
SystemTime::now().duration_since(UNIX_EPOCH).chain_err(|| ErrorKind::InternalServerError)?.as_secs() as i64;
let last_sent = now - user.last_message_sent;
Ok(last_sent > RESEND_THRESHOLD_IN_SECONDS)
}
None => Ok(true),
}
}
}