use crate::{ messages::*, serialize_websocket_message, LemmyContext, OperationType, UserOperation, UserOperationCrud, }; use actix::prelude::*; use anyhow::Context as acontext; use background_jobs::QueueHandle; use diesel::{ r2d2::{ConnectionManager, Pool}, PgConnection, }; use lemmy_api_common::{comment::*, post::*}; use lemmy_db_schema::{ newtypes::{CommunityId, LocalUserId, PostId}, source::secret::Secret, }; use lemmy_utils::{ location_info, rate_limit::RateLimit, settings::structs::Settings, ConnectionId, IpAddr, LemmyError, }; use rand::rngs::ThreadRng; use reqwest_middleware::ClientWithMiddleware; use serde::Serialize; use serde_json::Value; use std::{ collections::{HashMap, HashSet}, future::Future, str::FromStr, }; use tokio::macros::support::Pin; type MessageHandlerType = fn( context: LemmyContext, id: ConnectionId, op: UserOperation, data: &str, ) -> Pin> + '_>>; type MessageHandlerCrudType = fn( context: LemmyContext, id: ConnectionId, op: UserOperationCrud, data: &str, ) -> Pin> + '_>>; /// `ChatServer` manages chat rooms and responsible for coordinating chat /// session. pub struct ChatServer { /// A map from generated random ID to session addr pub sessions: HashMap, /// A map from post_id to set of connectionIDs pub post_rooms: HashMap>, /// A map from community to set of connectionIDs pub community_rooms: HashMap>, pub mod_rooms: HashMap>, /// A map from user id to its connection ID for joined users. Remember a user can have multiple /// sessions (IE clients) pub(super) user_rooms: HashMap>, pub(super) rng: ThreadRng, /// The DB Pool pub(super) pool: Pool>, /// The Settings pub(super) settings: Settings, /// The Secrets pub(super) secret: Secret, /// Rate limiting based on rate type and IP addr pub(super) rate_limiter: RateLimit, /// A list of the current captchas pub(super) captchas: Vec, message_handler: MessageHandlerType, message_handler_crud: MessageHandlerCrudType, /// An HTTP Client client: ClientWithMiddleware, activity_queue: QueueHandle, } pub struct SessionInfo { pub addr: Recipient, pub ip: IpAddr, } /// `ChatServer` is an actor. It maintains list of connection client session. /// And manages available rooms. Peers send messages to other peers in same /// room through `ChatServer`. impl ChatServer { #![allow(clippy::too_many_arguments)] pub fn startup( pool: Pool>, rate_limiter: RateLimit, message_handler: MessageHandlerType, message_handler_crud: MessageHandlerCrudType, client: ClientWithMiddleware, activity_queue: QueueHandle, settings: Settings, secret: Secret, ) -> ChatServer { ChatServer { sessions: HashMap::new(), post_rooms: HashMap::new(), community_rooms: HashMap::new(), mod_rooms: HashMap::new(), user_rooms: HashMap::new(), rng: rand::thread_rng(), pool, rate_limiter, captchas: Vec::new(), message_handler, message_handler_crud, client, activity_queue, settings, secret, } } pub fn join_community_room( &mut self, community_id: CommunityId, id: ConnectionId, ) -> Result<(), LemmyError> { // remove session from all rooms for sessions in self.community_rooms.values_mut() { sessions.remove(&id); } // Also leave all post rooms // This avoids double messages for sessions in self.post_rooms.values_mut() { sessions.remove(&id); } // If the room doesn't exist yet if self.community_rooms.get_mut(&community_id).is_none() { self.community_rooms.insert(community_id, HashSet::new()); } self .community_rooms .get_mut(&community_id) .context(location_info!())? .insert(id); Ok(()) } pub fn join_mod_room( &mut self, community_id: CommunityId, id: ConnectionId, ) -> Result<(), LemmyError> { // remove session from all rooms for sessions in self.mod_rooms.values_mut() { sessions.remove(&id); } // If the room doesn't exist yet if self.mod_rooms.get_mut(&community_id).is_none() { self.mod_rooms.insert(community_id, HashSet::new()); } self .mod_rooms .get_mut(&community_id) .context(location_info!())? .insert(id); Ok(()) } pub fn join_post_room(&mut self, post_id: PostId, id: ConnectionId) -> Result<(), LemmyError> { // remove session from all rooms for sessions in self.post_rooms.values_mut() { sessions.remove(&id); } // Also leave all communities // This avoids double messages // TODO found a bug, whereby community messages like // delete and remove aren't sent, because // you left the community room for sessions in self.community_rooms.values_mut() { sessions.remove(&id); } // If the room doesn't exist yet if self.post_rooms.get_mut(&post_id).is_none() { self.post_rooms.insert(post_id, HashSet::new()); } self .post_rooms .get_mut(&post_id) .context(location_info!())? .insert(id); Ok(()) } pub fn join_user_room( &mut self, user_id: LocalUserId, id: ConnectionId, ) -> Result<(), LemmyError> { // remove session from all rooms for sessions in self.user_rooms.values_mut() { sessions.remove(&id); } // If the room doesn't exist yet if self.user_rooms.get_mut(&user_id).is_none() { self.user_rooms.insert(user_id, HashSet::new()); } self .user_rooms .get_mut(&user_id) .context(location_info!())? .insert(id); Ok(()) } fn send_post_room_message( &self, op: &OP, response: &Response, post_id: PostId, websocket_id: Option, ) -> Result<(), LemmyError> where OP: OperationType + ToString, Response: Serialize, { let res_str = &serialize_websocket_message(op, response)?; if let Some(sessions) = self.post_rooms.get(&post_id) { for id in sessions { if let Some(my_id) = websocket_id { if *id == my_id { continue; } } self.sendit(res_str, *id); } } Ok(()) } pub fn send_community_room_message( &self, op: &OP, response: &Response, community_id: CommunityId, websocket_id: Option, ) -> Result<(), LemmyError> where OP: OperationType + ToString, Response: Serialize, { let res_str = &serialize_websocket_message(op, response)?; if let Some(sessions) = self.community_rooms.get(&community_id) { for id in sessions { if let Some(my_id) = websocket_id { if *id == my_id { continue; } } self.sendit(res_str, *id); } } Ok(()) } pub fn send_mod_room_message( &self, op: &OP, response: &Response, community_id: CommunityId, websocket_id: Option, ) -> Result<(), LemmyError> where OP: OperationType + ToString, Response: Serialize, { let res_str = &serialize_websocket_message(op, response)?; if let Some(sessions) = self.mod_rooms.get(&community_id) { for id in sessions { if let Some(my_id) = websocket_id { if *id == my_id { continue; } } self.sendit(res_str, *id); } } Ok(()) } pub fn send_all_message( &self, op: &OP, response: &Response, websocket_id: Option, ) -> Result<(), LemmyError> where OP: OperationType + ToString, Response: Serialize, { let res_str = &serialize_websocket_message(op, response)?; for id in self.sessions.keys() { if let Some(my_id) = websocket_id { if *id == my_id { continue; } } self.sendit(res_str, *id); } Ok(()) } pub fn send_user_room_message( &self, op: &OP, response: &Response, recipient_id: LocalUserId, websocket_id: Option, ) -> Result<(), LemmyError> where OP: OperationType + ToString, Response: Serialize, { let res_str = &serialize_websocket_message(op, response)?; if let Some(sessions) = self.user_rooms.get(&recipient_id) { for id in sessions { if let Some(my_id) = websocket_id { if *id == my_id { continue; } } self.sendit(res_str, *id); } } Ok(()) } pub fn send_comment( &self, user_operation: &OP, comment: &CommentResponse, websocket_id: Option, ) -> Result<(), LemmyError> where OP: OperationType + ToString, { let mut comment_reply_sent = comment.clone(); // Strip out my specific user info comment_reply_sent.comment_view.my_vote = None; // Send it to the post room let mut comment_post_sent = comment_reply_sent.clone(); // Remove the recipients here to separate mentions / user messages from post or community comments comment_post_sent.recipient_ids = Vec::new(); self.send_post_room_message( user_operation, &comment_post_sent, comment_post_sent.comment_view.post.id, websocket_id, )?; // Send it to the community too self.send_community_room_message( user_operation, &comment_post_sent, CommunityId(0), websocket_id, )?; self.send_community_room_message( user_operation, &comment_post_sent, comment.comment_view.community.id, websocket_id, )?; // Send it to the recipient(s) including the mentioned users for recipient_id in &comment_reply_sent.recipient_ids { self.send_user_room_message( user_operation, &comment_reply_sent, *recipient_id, websocket_id, )?; } Ok(()) } pub fn send_post( &self, user_operation: &OP, post_res: &PostResponse, websocket_id: Option, ) -> Result<(), LemmyError> where OP: OperationType + ToString, { let community_id = post_res.post_view.community.id; // Don't send my data with it let mut post_sent = post_res.clone(); post_sent.post_view.my_vote = None; // Send it to /c/all and that community self.send_community_room_message(user_operation, &post_sent, CommunityId(0), websocket_id)?; self.send_community_room_message(user_operation, &post_sent, community_id, websocket_id)?; // Send it to the post room self.send_post_room_message( user_operation, &post_sent, post_res.post_view.post.id, websocket_id, )?; Ok(()) } fn sendit(&self, message: &str, id: ConnectionId) { if let Some(info) = self.sessions.get(&id) { let _ = info.addr.do_send(WsMessage(message.to_owned())); } } pub(super) fn parse_json_message( &mut self, msg: StandardMessage, ctx: &mut Context, ) -> impl Future> { let rate_limiter = self.rate_limiter.clone(); let ip: IpAddr = match self.sessions.get(&msg.id) { Some(info) => info.ip.to_owned(), None => IpAddr("blank_ip".to_string()), }; let context = LemmyContext { pool: self.pool.clone(), chat_server: ctx.address(), client: self.client.to_owned(), activity_queue: self.activity_queue.to_owned(), settings: self.settings.to_owned(), secret: self.secret.to_owned(), }; let message_handler_crud = self.message_handler_crud; let message_handler = self.message_handler; async move { let json: Value = serde_json::from_str(&msg.msg)?; let data = &json["data"].to_string(); let op = &json["op"] .as_str() .ok_or_else(|| LemmyError::from_message("missing op"))?; // check if api call passes the rate limit, and generate future for later execution let (passed, fut) = if let Ok(user_operation_crud) = UserOperationCrud::from_str(op) { let passed = match user_operation_crud { UserOperationCrud::Register => rate_limiter.register().check(ip).await, UserOperationCrud::CreatePost => rate_limiter.post().check(ip).await, UserOperationCrud::CreateCommunity => rate_limiter.register().check(ip).await, UserOperationCrud::CreateComment => rate_limiter.comment().check(ip).await, _ => rate_limiter.message().check(ip).await, }; let fut = (message_handler_crud)(context, msg.id, user_operation_crud, data); (passed, fut) } else { let user_operation = UserOperation::from_str(op)?; let passed = match user_operation { UserOperation::GetCaptcha => rate_limiter.post().check(ip).await, _ => rate_limiter.message().check(ip).await, }; let fut = (message_handler)(context, msg.id, user_operation, data); (passed, fut) }; // if rate limit passed, execute api call future if passed { fut.await } else { // if rate limit was hit, respond with empty message Ok("".to_string()) } } } }