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forwarder.rs
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forwarder.rs
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use std::time::{SystemTime, UNIX_EPOCH};
use diesel::Connection;
use diesel::sqlite::SqliteConnection;
use slog::Logger;
use ruma_identifiers::RoomId;
use i18n::*;
use api::{MatrixApi, RocketchatApi};
use api::rocketchat::Message;
use config::Config;
use db::{RocketchatServer, Room, UserInRoom, UserOnRocketchatServer};
use errors::*;
use handlers::events::RoomHandler;
use handlers::rocketchat::VirtualUserHandler;
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 MatrixApi,
}
impl<'a> Forwarder<'a> {
/// Send a message to the Matrix channel.
pub fn send(&self, rocketchat_server: &RocketchatServer, message: &Message) -> Result<()> {
let virtual_user_handler = VirtualUserHandler {
config: self.config,
connection: self.connection,
logger: self.logger,
matrix_api: self.matrix_api,
};
let mut user_on_rocketchat_server = self.connection.transaction(|| {
virtual_user_handler.find_or_register(
rocketchat_server.id.clone(),
message.user_id.clone(),
message.user_name.clone(),
)
})?;
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.clone(),
message.channel_id.clone(),
)? {
Some(ref mut room) if room.is_direct_message_room => {
debug!(self.logger, "Got a message for a direct message room (channel_id `{}`)", &message.channel_id);
let receiver_matrix_user_id = match self.find_matching_user_for_direct_message(rocketchat_server, message)? {
Some(user_on_rocketchat_server) => user_on_rocketchat_server.matrix_user_id.clone(),
None => {
debug!(
self.logger,
"No matching user found. Not re-bridging channel {} automatically",
message.channel_id
);
return Ok(());
}
};
if !room.is_bridged {
self.matrix_api.invite(
room.matrix_room_id.clone(),
receiver_matrix_user_id,
user_on_rocketchat_server.matrix_user_id.clone(),
)?;
room.set_is_bridged(self.connection, true)?;
}
room.matrix_room_id.clone()
}
Some(ref room) if room.is_bridged => room.matrix_room_id.clone(),
Some(ref room) => {
debug!(
self.logger,
"Ignoring message from Rocket.Chat channel `{}`, because the channel was bridged \
with the matrix_room_id {}, but is not bridged anymore.",
message.channel_id,
&room.matrix_room_id
);
return Ok(());
}
None => {
match self.auto_bridge_direct_message_channel(&virtual_user_handler, rocketchat_server, message)? {
Some(matrix_room_id) => matrix_room_id,
None => {
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() {
let bot_matrix_user_id = self.config.matrix_bot_user_id()?;
virtual_user_handler.add_to_room(
user_on_rocketchat_server.matrix_user_id.clone(),
bot_matrix_user_id,
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 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.clone(),
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),
}
}
fn auto_bridge_direct_message_channel(
&self,
virtual_user_handler: &VirtualUserHandler,
rocketchat_server: &RocketchatServer,
message: &Message,
) -> Result<Option<RoomId>> {
debug!(
self.logger,
"Got a message for a room that is not bridged yet (channel_id `{}`), checking if it's a direct message",
&message.channel_id
);
let user_on_rocketchat_server = match self.find_matching_user_for_direct_message(rocketchat_server, message)? {
Some(user_on_rocketchat_server) => user_on_rocketchat_server,
None => {
debug!(self.logger, "No matching user found. Not bridging channel {} automatically", message.channel_id);
return Ok(None);
}
};
let rocketchat_api = RocketchatApi::new(rocketchat_server.rocketchat_url.clone(), self.logger.clone())?
.with_credentials(
user_on_rocketchat_server.rocketchat_user_id.clone().unwrap_or_default(),
user_on_rocketchat_server.rocketchat_auth_token.clone().unwrap_or_default(),
);
if let Some(direct_message_channel) =
rocketchat_api.direct_messages_list()?.iter().find(|dm| dm.id == message.channel_id)
{
let direct_message_sender = virtual_user_handler.find_or_register(
rocketchat_server.id.clone(),
message.user_id.clone(),
message.user_name.clone(),
)?;
let room_handler = RoomHandler::new(self.config, self.connection, self.logger, self.matrix_api);
let direct_message_receiver = user_on_rocketchat_server.user(self.connection)?;
let room_display_name_suffix =
t!(["defaults", "direct_message_room_display_name_suffix"]).l(&direct_message_receiver.language);
let room_display_name = format!("{} {}", message.user_name, room_display_name_suffix);
let room = room_handler.create_room(
direct_message_channel.id.clone(),
rocketchat_server.id.clone(),
direct_message_sender.matrix_user_id.clone(),
user_on_rocketchat_server.matrix_user_id.clone(),
Some(room_display_name),
true,
)?;
debug!(self.logger, "Direct message room {} successfully created", &room.matrix_room_id);
Ok(Some(room.matrix_room_id.clone()))
} else {
debug!(
self.logger,
"User {} matched the channel_id, but does not have access to the channel. \
Not bridging channel {} automatically",
user_on_rocketchat_server.matrix_user_id,
message.channel_id
);
Ok(None)
}
}
// this is a pretty hacky way to find a Matrix user that could be the recipient for this
// message. The message itself doesn't contain any information about the recipient so the
// channel ID has to be checked against all users that use the application service and are
// logged in on the sending Rocket.Chat server, because direct message channel IDs consist of
// the `user_id`s of the two participants.
fn find_matching_user_for_direct_message(
&self,
rocketchat_server: &RocketchatServer,
message: &Message,
) -> Result<Option<UserOnRocketchatServer>> {
for user_on_rocketchat_server in rocketchat_server.logged_in_users_on_rocketchat_server(self.connection)? {
if let Some(rocketchat_user_id) = user_on_rocketchat_server.rocketchat_user_id.clone() {
if message.channel_id.contains(&rocketchat_user_id) {
debug!(
self.logger,
"Matching user with rocketchat_user_id `{}` for channel_id `{}` found.",
rocketchat_user_id,
&message.channel_id
);
return Ok(Some(user_on_rocketchat_server));
}
}
}
Ok(None)
}
}