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room_handler.rs
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room_handler.rs
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use std::convert::TryFrom;
use diesel::Connection;
use diesel::sqlite::SqliteConnection;
use iron::url::Host;
use ruma_events::room::member::{MemberEvent, MembershipState};
use ruma_identifiers::{RoomId, UserId};
use slog::Logger;
use api::{MatrixApi, RocketchatApi};
use api::rocketchat::Channel;
use config::Config;
use db::{NewRoom, NewUserInRoom, RocketchatServer, Room, User, UserInRoom};
use errors::*;
use handlers::ErrorNotifier;
use handlers::rocketchat::VirtualUserHandler;
use i18n::*;
use super::CommandHandler;
/// Handles room events
pub struct RoomHandler<'a> {
config: &'a Config,
connection: &'a SqliteConnection,
logger: &'a Logger,
matrix_api: &'a MatrixApi,
}
impl<'a> RoomHandler<'a> {
/// Create a new `RoomHandler`.
pub fn new(
config: &'a Config,
connection: &'a SqliteConnection,
logger: &'a Logger,
matrix_api: &'a MatrixApi,
) -> RoomHandler<'a> {
RoomHandler {
config: config,
connection: connection,
logger: logger,
matrix_api: matrix_api,
}
}
/// Handles room membership changes
pub fn process(&self, event: &MemberEvent) -> Result<()> {
let matrix_bot_user_id = self.config.matrix_bot_user_id()?;
let state_key = UserId::try_from(&event.state_key).chain_err(|| ErrorKind::InvalidUserId(event.state_key.clone()))?;
let addressed_to_matrix_bot = state_key == matrix_bot_user_id;
match event.content.membership {
MembershipState::Invite if addressed_to_matrix_bot => {
let msg = format!("Bot `{}` got invitation for room `{}`", matrix_bot_user_id, event.room_id);
debug!(self.logger, msg);
self.handle_bot_invite(event.room_id.clone(), matrix_bot_user_id, event.user_id.clone())?;
}
MembershipState::Join if addressed_to_matrix_bot => {
let msg = format!("Received join event for bot user {} and room {}", matrix_bot_user_id, event.room_id);
debug!(self.logger, msg);
self.handle_bot_join(event.room_id.clone(), matrix_bot_user_id)?;
}
MembershipState::Join => {
let msg = format!("Received join event for user {} and room {}", &state_key, &event.room_id);
debug!(self.logger, msg);
self.handle_user_join(state_key, event.room_id.clone())?;
}
MembershipState::Leave if addressed_to_matrix_bot => {
let msg = format!("Bot {} left room {}", event.user_id, event.room_id);
debug!(self.logger, msg);
self.handle_bot_leave(&event.room_id)?;
}
MembershipState::Leave if !addressed_to_matrix_bot => {
let msg = format!("User {} left room {}", event.user_id, event.room_id);
debug!(self.logger, msg);
self.handle_user_leave(&event.user_id, &event.room_id)?;
}
_ => {
let msg = format!(
"Skipping event, don't know how to handle membership state `{}` with state key `{}`",
event.content.membership,
event.state_key
);
debug!(self.logger, msg);
}
}
Ok(())
}
/// Bridges a new room between Rocket.Chat and Matrix. It creates the room on the Matrix
/// homeserver and manages the rooms virtual users.
pub fn bridge_new_room(
&self,
rocketchat_api: Box<RocketchatApi>,
rocketchat_server: &RocketchatServer,
channel: &Channel,
room_creator_id: UserId,
invited_user_id: UserId,
) -> Result<Room> {
let room = self.create_room(
channel.id.clone(),
rocketchat_server.id.clone(),
room_creator_id,
invited_user_id,
channel.name.clone(),
false,
)?;
self.add_virtual_users_to_room(rocketchat_api, channel, rocketchat_server.id.clone(), room.matrix_room_id.clone())?;
Ok(room)
}
fn handle_bot_invite(&self, matrix_room_id: RoomId, invited_user_id: UserId, sender_id: UserId) -> Result<()> {
if !self.config.accept_remote_invites && self.is_remote_invite(&matrix_room_id)? {
info!(
self.logger,
"Bot was invited by a user from another homeserver ({}). \
Ignoring the invite because remote invites are disabled.",
&matrix_room_id
);
return Ok(());
}
self.connection
.transaction(|| {
let user = User::find_or_create_by_matrix_user_id(self.connection, sender_id)?;
let display_name = t!(["defaults", "admin_room_display_name"]).l(&user.language);
let room = NewRoom {
matrix_room_id: matrix_room_id.clone(),
display_name: display_name,
rocketchat_server_id: None,
rocketchat_room_id: None,
is_admin_room: true,
is_bridged: false,
is_direct_message_room: false,
};
Room::insert(self.connection, &room)?;
let user_in_room = NewUserInRoom {
matrix_user_id: user.matrix_user_id,
matrix_room_id: room.matrix_room_id,
};
UserInRoom::insert(self.connection, &user_in_room)
})
.map_err(Error::from)?;
self.matrix_api.join(matrix_room_id, invited_user_id)
}
fn handle_bot_join(&self, matrix_room_id: RoomId, matrix_bot_user_id: UserId) -> Result<()> {
let room = match self.insert_user_into_room(matrix_bot_user_id.clone(), matrix_room_id.clone())? {
Some(room) => room,
None => return Ok(()),
};
if room.is_admin_room {
let users: Vec<User> =
room.users(self.connection)?.into_iter().filter(|user| user.matrix_user_id != matrix_bot_user_id).collect();
let invitation_submitter =
users.first().expect("There is always another user in the room, because this user invited the bot");
self.validate_admin_room(&room, invitation_submitter, matrix_bot_user_id.clone())?;
let body =
CommandHandler::build_help_message(self.connection, self.config.as_url.clone(), &room, invitation_submitter)?;
self.matrix_api.send_text_message_event(matrix_room_id.clone(), matrix_bot_user_id, body)?;
let room_name = t!(["defaults", "admin_room_display_name"]).l(&invitation_submitter.language);
self.matrix_api.set_room_name(matrix_room_id.clone(), room_name)?;
}
Ok(())
}
fn handle_user_join(&self, matrix_user_id: UserId, matrix_room_id: RoomId) -> Result<()> {
let room = match self.insert_user_into_room(matrix_user_id.clone(), matrix_room_id.clone())? {
Some(room) => room,
None => return Ok(()),
};
if room.is_admin_room && !room.users(self.connection)?.iter().any(|user| user.matrix_user_id == matrix_user_id) {
info!(self.logger, "Another user join the admin room {}, bot user is leaving", matrix_room_id);
let admin_room_language = self.admin_room_language(&room)?;
let body = t!(["errors", "other_user_joined"]).l(&admin_room_language);
self.matrix_api.send_text_message_event(matrix_room_id, self.config.matrix_bot_user_id()?, body)?;
self.leave_and_forget_room(&room)?;
}
Ok(())
}
fn handle_bot_leave(&self, matrix_room_id: &RoomId) -> Result<()> {
let room = Room::find(self.connection, matrix_room_id)?;
room.delete(self.connection)
}
fn handle_user_leave(&self, matrix_user_id: &UserId, matrix_room_id: &RoomId) -> Result<()> {
let mut room = match Room::find_by_matrix_room_id(self.connection, matrix_room_id)? {
Some(room) => room,
None => return Ok(()),
};
if room.is_admin_room {
return self.leave_and_forget_room(&room);
}
if room.is_direct_message_room {
room.set_is_bridged(self.connection, false)?;
}
if let Some(user_in_room) =
UserInRoom::find_by_matrix_user_id_and_matrix_room_id(self.connection, matrix_user_id, matrix_room_id)?
{
user_in_room.delete(self.connection)?;
}
Ok(())
}
fn leave_and_forget_room(&self, room: &Room) -> Result<()> {
self.matrix_api.leave_room(room.matrix_room_id.clone())?;
self.matrix_api.forget_room(room.matrix_room_id.clone())
}
fn admin_room_language(&self, room: &Room) -> Result<String> {
let matrix_bot_user_id = self.config.matrix_bot_user_id()?;
let users: Vec<User> = room.non_virtual_users(self.connection)?
.into_iter()
.filter(|user| user.matrix_user_id != matrix_bot_user_id)
.collect();
let user = users.first().expect("An admin room always contains another user");
Ok(user.language.clone())
}
fn is_remote_invite(&self, matrix_room_id: &RoomId) -> Result<bool> {
let hs_hostname =
Host::parse(&self.config.hs_domain).chain_err(|| ErrorKind::InvalidHostname(self.config.hs_domain.clone()))?;
Ok(matrix_room_id.hostname().ne(&hs_hostname))
}
fn validate_admin_room(&self, room: &Room, invitation_submitter: &User, matrix_bot_user_id: UserId) -> Result<()> {
match self.matrix_api.get_room_creator(room.matrix_room_id.clone()) {
Ok(room_creator_id) => {
if invitation_submitter.matrix_user_id != room_creator_id {
self.handle_admin_room_not_created_by_inviter(room,
&invitation_submitter.matrix_user_id,
&room_creator_id)?;
return Ok(());
}
}
Err(err) => {
let error_notifier = ErrorNotifier {
config: self.config,
connection: self.connection,
logger: self.logger,
matrix_api: self.matrix_api,
};
error_notifier.send_message_to_user(&err, room.matrix_room_id.clone(), &invitation_submitter.matrix_user_id)?;
self.leave_and_forget_room(room)?;
return Err(err);
}
};
match self.is_private_room(room.matrix_room_id.clone()) {
Ok(is_private_room) => {
if !is_private_room {
return self.handle_non_private_room(room, invitation_submitter, matrix_bot_user_id);
};
}
Err(err) => {
let error_notifier = ErrorNotifier {
config: self.config,
connection: self.connection,
logger: self.logger,
matrix_api: self.matrix_api,
};
error_notifier.send_message_to_user(&err, room.matrix_room_id.clone(), &invitation_submitter.matrix_user_id)?;
self.leave_and_forget_room(room)?;
return Err(err);
}
}
Ok(())
}
fn is_private_room(&self, matrix_room_id: RoomId) -> Result<bool> {
Ok(self.matrix_api.get_room_members(matrix_room_id)?.len() <= 2)
}
fn handle_non_private_room(&self, room: &Room, invitation_submitter: &User, matrix_bot_user_id: UserId) -> Result<()> {
info!(self.logger, format!("Room {} has more then two members and cannot be used as admin room", room.matrix_room_id));
let body = t!(["errors", "too_many_members_in_room"]).l(&invitation_submitter.language);
self.matrix_api.send_text_message_event(room.matrix_room_id.clone(), matrix_bot_user_id, body)?;
self.leave_and_forget_room(room)?;
Ok(())
}
fn handle_admin_room_not_created_by_inviter(
&self,
room: &Room,
sender_id: &UserId,
room_creator_id: &UserId,
) -> Result<()> {
let body = t!(["admin_room", "only_room_creator_can_invite_bot_user"]).l(DEFAULT_LANGUAGE);
self.matrix_api.send_text_message_event(room.matrix_room_id.clone(), self.config.matrix_bot_user_id()?, body)?;
info!(
self.logger,
"The bot user was invited by the user {} but the room {} was created by {}, bot user is leaving",
sender_id,
&room.matrix_room_id,
room_creator_id
);
self.leave_and_forget_room(room)
}
/// Create a room on the Matrix homeserver with the power levels for a bridged room.
pub fn create_room(
&self,
rocketchat_room_id: String,
rocketchat_server_id: String,
room_creator_id: UserId,
invited_user_id: UserId,
room_display_name: Option<String>,
is_direct_message_room: bool,
) -> Result<Room> {
let room_alias_name = format!("{}_{}_{}", self.config.sender_localpart, rocketchat_server_id, rocketchat_room_id);
let matrix_room_id = self.matrix_api.create_room(room_display_name.clone(), Some(room_alias_name), &room_creator_id)?;
debug!(self.logger, "Successfully created room, matrix_room_id is {}", &matrix_room_id);
self.matrix_api.set_default_powerlevels(matrix_room_id.clone(), room_creator_id.clone())?;
debug!(self.logger, "Successfully set powerlevels for room {}", &matrix_room_id);
self.matrix_api.invite(matrix_room_id.clone(), invited_user_id.clone(), room_creator_id.clone())?;
debug!(self.logger, "{} successfully invited {} into room {}", &room_creator_id, &invited_user_id, &matrix_room_id);
let new_room = NewRoom {
matrix_room_id: matrix_room_id.clone(),
display_name: room_display_name.unwrap_or_else(|| rocketchat_room_id.clone()),
rocketchat_server_id: Some(rocketchat_server_id),
rocketchat_room_id: Some(rocketchat_room_id),
is_admin_room: false,
is_bridged: true,
is_direct_message_room: is_direct_message_room,
};
let room = Room::insert(self.connection, &new_room)?;
// create the user for the room creator to avoid race conditions when the join event for
// the room creator is triggered before the room is persisted in the database.
let new_user_in_room = NewUserInRoom {
matrix_user_id: room_creator_id,
matrix_room_id: matrix_room_id,
};
UserInRoom::insert(self.connection, &new_user_in_room)?;
Ok(room)
}
/// Add all users that are in a Rocket.Chat room to the Matrix room.
pub fn add_virtual_users_to_room(
&self,
rocketchat_api: Box<RocketchatApi>,
channel: &Channel,
rocketchat_server_id: String,
matrix_room_id: RoomId,
) -> Result<()> {
debug!(self.logger, "Starting to add virtual users to room {}", matrix_room_id);
let virtual_user_handler = VirtualUserHandler {
config: self.config,
connection: self.connection,
logger: self.logger,
matrix_api: self.matrix_api,
};
//TODO: Check if a max number of users per channel has to be defined to avoid problems when
//there are several thousand users in a channel.
let bot_matrix_user_id = self.config.matrix_bot_user_id()?;
for username in &channel.usernames {
let rocketchat_user = rocketchat_api.users_info(username)?;
let user_on_rocketchat_server =
virtual_user_handler.find_or_register(rocketchat_server_id.clone(), rocketchat_user.id, username.to_string())?;
virtual_user_handler.add_to_room(
user_on_rocketchat_server.matrix_user_id,
bot_matrix_user_id.clone(),
matrix_room_id.clone(),
)?;
}
debug!(self.logger, "Successfully added {} virtual users to room {}", channel.usernames.len(), matrix_room_id);
Ok(())
}
fn insert_user_into_room(&self, matrix_user_id: UserId, matrix_room_id: RoomId) -> Result<Option<Room>> {
let room = match Room::find_by_matrix_room_id(self.connection, &matrix_room_id)? {
Some(room) => room,
None => {
info!(
self.logger,
"Received join event for user {} and room {}, but the room wasn't persisted to the database. \
This is usually because the join event was finished before the room was stored in the database. \
That's not an issue, because room creators are saved to the database when the room is created.",
&matrix_user_id,
&matrix_room_id
);
return Ok(None);
}
};
if UserInRoom::find_by_matrix_user_id_and_matrix_room_id(self.connection, &matrix_user_id, &matrix_room_id)?.is_some() {
let msg = format!(
"Skipping join event because the user {} is already in the room {} \
(join event triggered due to name change)",
&matrix_user_id,
&matrix_room_id
);
debug!(self.logger, msg);
return Ok(Some(room));
}
let user_in_room = NewUserInRoom {
matrix_user_id: matrix_user_id.clone(),
matrix_room_id: matrix_room_id.clone(),
};
UserInRoom::insert(self.connection, &user_in_room)?;
Ok(Some(room))
}
}