lemmy/server/src/websocket_server/server.rs

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Rust
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//! `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`.
use actix::prelude::*;
use rand::{rngs::ThreadRng, Rng};
use std::collections::{HashMap, HashSet};
use serde::{Deserialize, Serialize};
use serde_json::{Result, Value};
use bcrypt::{verify};
use std::str::FromStr;
use {Crud, Joinable, establish_connection};
use actions::community::*;
use actions::user::*;
use actions::post::*;
use actions::comment::*;
#[derive(EnumString,ToString,Debug)]
pub enum UserOperation {
Login, Register, Logout, CreateCommunity, ListCommunities, CreatePost, GetPost, GetCommunity, CreateComment, Join, Edit, Reply, Vote, Delete, NextPage, Sticky
}
#[derive(EnumString,ToString,Debug)]
pub enum MessageToUser {
Comments, Users, Ping, Pong, Error
}
#[derive(Serialize, Deserialize)]
pub struct ErrorMessage {
op: String,
error: String
}
/// Chat server sends this messages to session
#[derive(Message)]
pub struct WSMessage(pub String);
/// Message for chat server communications
/// New chat session is created
#[derive(Message)]
#[rtype(usize)]
pub struct Connect {
pub addr: Recipient<WSMessage>,
}
/// Session is disconnected
#[derive(Message)]
pub struct Disconnect {
pub id: usize,
}
/// Send message to specific room
#[derive(Message)]
pub struct ClientMessage {
/// Id of the client session
pub id: usize,
/// Peer message
pub msg: String,
/// Room name
pub room: String,
}
#[derive(Serialize, Deserialize)]
pub struct StandardMessage {
/// Id of the client session
pub id: usize,
/// Peer message
pub msg: String,
}
impl actix::Message for StandardMessage {
type Result = String;
}
/// List of available rooms
pub struct ListRooms;
impl actix::Message for ListRooms {
type Result = Vec<String>;
}
/// Join room, if room does not exists create new one.
#[derive(Message)]
pub struct Join {
/// Client id
pub id: usize,
/// Room name
pub name: String,
}
#[derive(Serialize, Deserialize)]
pub struct Login {
pub username_or_email: String,
pub password: String
}
#[derive(Serialize, Deserialize)]
pub struct Register {
username: String,
email: Option<String>,
password: String,
password_verify: String
}
#[derive(Serialize, Deserialize)]
pub struct LoginResponse {
op: String,
jwt: String
}
#[derive(Serialize, Deserialize)]
pub struct CreateCommunity {
name: String,
auth: String
}
#[derive(Serialize, Deserialize)]
pub struct CreateCommunityResponse {
op: String,
community: Community
}
#[derive(Serialize, Deserialize)]
pub struct ListCommunities;
#[derive(Serialize, Deserialize)]
pub struct ListCommunitiesResponse {
op: String,
communities: Vec<Community>
}
#[derive(Serialize, Deserialize)]
pub struct CreatePost {
name: String,
url: Option<String>,
body: Option<String>,
community_id: i32,
auth: String
}
#[derive(Serialize, Deserialize)]
pub struct CreatePostResponse {
op: String,
post: Post
}
#[derive(Serialize, Deserialize)]
pub struct GetPost {
id: i32
}
#[derive(Serialize, Deserialize)]
pub struct GetPostResponse {
op: String,
post: Post,
comments: Vec<Comment>
}
#[derive(Serialize, Deserialize)]
pub struct GetCommunity {
id: i32
}
#[derive(Serialize, Deserialize)]
pub struct GetCommunityResponse {
op: String,
community: Community
}
#[derive(Serialize, Deserialize)]
pub struct CreateComment {
content: String,
parent_id: Option<i32>,
post_id: i32,
auth: String
}
#[derive(Serialize, Deserialize)]
pub struct CreateCommentResponse {
op: String,
comment: Comment
}
/// `ChatServer` manages chat rooms and responsible for coordinating chat
/// session. implementation is super primitive
pub struct ChatServer {
sessions: HashMap<usize, Recipient<WSMessage>>, // A map from generated random ID to session addr
rooms: HashMap<String, HashSet<usize>>, // A map from room name to set of connectionIDs
rng: ThreadRng,
}
impl Default for ChatServer {
fn default() -> ChatServer {
// default room
let mut rooms = HashMap::new();
rooms.insert("Main".to_owned(), HashSet::new());
ChatServer {
sessions: HashMap::new(),
rooms: rooms,
rng: rand::thread_rng(),
}
}
}
impl ChatServer {
/// Send message to all users in the room
fn send_room_message(&self, room: &str, message: &str, skip_id: usize) {
if let Some(sessions) = self.rooms.get(room) {
for id in sessions {
if *id != skip_id {
if let Some(addr) = self.sessions.get(id) {
let _ = addr.do_send(WSMessage(message.to_owned()));
}
}
}
}
}
/// Send message only to self
fn send(&self, message: &str, id: &usize) {
// println!("{:?}", self.sessions);
if let Some(addr) = self.sessions.get(id) {
println!("msg: {}", message);
// println!("{:?}", addr.connected());
let _ = addr.do_send(WSMessage(message.to_owned()));
}
}
}
/// Make actor from `ChatServer`
impl Actor for ChatServer {
/// We are going to use simple Context, we just need ability to communicate
/// with other actors.
type Context = Context<Self>;
}
/// Handler for Connect message.
///
/// Register new session and assign unique id to this session
impl Handler<Connect> for ChatServer {
type Result = usize;
fn handle(&mut self, msg: Connect, _: &mut Context<Self>) -> Self::Result {
println!("Someone joined");
// notify all users in same room
self.send_room_message(&"Main".to_owned(), "Someone joined", 0);
// register session with random id
let id = self.rng.gen::<usize>();
self.sessions.insert(id, msg.addr);
// auto join session to Main room
self.rooms.get_mut(&"Main".to_owned()).unwrap().insert(id);
// send id back
id
}
}
/// Handler for Disconnect message.
impl Handler<Disconnect> for ChatServer {
type Result = ();
fn handle(&mut self, msg: Disconnect, _: &mut Context<Self>) {
println!("Someone disconnected");
let mut rooms: Vec<String> = Vec::new();
// remove address
if self.sessions.remove(&msg.id).is_some() {
// remove session from all rooms
for (name, sessions) in &mut self.rooms {
if sessions.remove(&msg.id) {
rooms.push(name.to_owned());
}
}
}
// send message to other users
for room in rooms {
self.send_room_message(&room, "Someone disconnected", 0);
}
}
}
/// Handler for Message message.
impl Handler<ClientMessage> for ChatServer {
type Result = ();
fn handle(&mut self, msg: ClientMessage, _: &mut Context<Self>) {
self.send_room_message(&msg.room, msg.msg.as_str(), msg.id);
}
}
/// Handler for Message message.
impl Handler<StandardMessage> for ChatServer {
type Result = MessageResult<StandardMessage>;
fn handle(&mut self, msg: StandardMessage, _: &mut Context<Self>) -> Self::Result {
let json: Value = serde_json::from_str(&msg.msg)
.expect("Couldn't parse message");
let data: &Value = &json["data"];
let op = &json["op"].as_str().unwrap();
let user_operation: UserOperation = UserOperation::from_str(&op).unwrap();
let res: String = match user_operation {
UserOperation::Login => {
let login: Login = serde_json::from_str(&data.to_string()).unwrap();
login.perform()
},
UserOperation::Register => {
let register: Register = serde_json::from_str(&data.to_string()).unwrap();
register.perform()
},
UserOperation::CreateCommunity => {
let create_community: CreateCommunity = serde_json::from_str(&data.to_string()).unwrap();
create_community.perform()
},
UserOperation::ListCommunities => {
let list_communities: ListCommunities = ListCommunities;
list_communities.perform()
},
UserOperation::CreatePost => {
let create_post: CreatePost = serde_json::from_str(&data.to_string()).unwrap();
create_post.perform()
},
UserOperation::GetPost => {
let get_post: GetPost = serde_json::from_str(&data.to_string()).unwrap();
get_post.perform()
},
UserOperation::GetCommunity => {
let get_community: GetCommunity = serde_json::from_str(&data.to_string()).unwrap();
get_community.perform()
},
UserOperation::CreateComment => {
let create_comment: CreateComment = serde_json::from_str(&data.to_string()).unwrap();
create_comment.perform()
},
_ => {
let e = ErrorMessage {
op: "Unknown".to_string(),
error: "Unknown User Operation".to_string()
};
serde_json::to_string(&e).unwrap()
}
// _ => "no".to_string()
};
MessageResult(res)
}
}
pub trait Perform {
fn perform(&self) -> String;
fn op_type(&self) -> UserOperation;
fn error(&self, error_msg: &str) -> String {
serde_json::to_string(
&ErrorMessage {
op: self.op_type().to_string(),
error: error_msg.to_string()
}
)
.unwrap()
}
}
impl Perform for Login {
fn op_type(&self) -> UserOperation {
UserOperation::Login
}
fn perform(&self) -> String {
let conn = establish_connection();
// Fetch that username / email
let user: User_ = match User_::find_by_email_or_username(&conn, &self.username_or_email) {
Ok(user) => user,
Err(e) => return self.error("Couldn't find that username or email")
};
// Verify the password
let valid: bool = verify(&self.password, &user.password_encrypted).unwrap_or(false);
if !valid {
return self.error("Password incorrect")
}
// Return the jwt
serde_json::to_string(
&LoginResponse {
op: self.op_type().to_string(),
jwt: user.jwt()
}
)
.unwrap()
}
}
impl Perform for Register {
fn op_type(&self) -> UserOperation {
UserOperation::Register
}
fn perform(&self) -> String {
let conn = establish_connection();
// Make sure passwords match
if &self.password != &self.password_verify {
return self.error("Passwords do not match.");
}
// Register the new user
let user_form = UserForm {
name: self.username.to_owned(),
email: self.email.to_owned(),
password_encrypted: self.password.to_owned(),
preferred_username: None,
updated: None
};
// Create the user
let inserted_user = match User_::create(&conn, &user_form) {
Ok(user) => user,
Err(e) => {
return self.error("User already exists.");
}
};
// Return the jwt
serde_json::to_string(
&LoginResponse {
op: self.op_type().to_string(),
jwt: inserted_user.jwt()
}
)
.unwrap()
}
}
impl Perform for CreateCommunity {
fn op_type(&self) -> UserOperation {
UserOperation::CreateCommunity
}
fn perform(&self) -> String {
let conn = establish_connection();
let claims = match Claims::decode(&self.auth) {
Ok(claims) => claims.claims,
Err(e) => {
return self.error("Not logged in.");
}
};
let user_id = claims.id;
let iss = claims.iss;
let community_form = CommunityForm {
name: self.name.to_owned(),
updated: None
};
let inserted_community = match Community::create(&conn, &community_form) {
Ok(community) => community,
Err(e) => {
return self.error("Community already exists.");
}
};
let community_user_form = CommunityUserForm {
community_id: inserted_community.id,
fedi_user_id: format!("{}/{}", iss, user_id)
};
let inserted_community_user = match CommunityUser::join(&conn, &community_user_form) {
Ok(user) => user,
Err(e) => {
return self.error("Community user already exists.");
}
};
serde_json::to_string(
&CreateCommunityResponse {
op: self.op_type().to_string(),
community: inserted_community
}
)
.unwrap()
}
}
impl Perform for ListCommunities {
fn op_type(&self) -> UserOperation {
UserOperation::ListCommunities
}
fn perform(&self) -> String {
let conn = establish_connection();
let communities: Vec<Community> = Community::list_all(&conn).unwrap();
// Return the jwt
serde_json::to_string(
&ListCommunitiesResponse {
op: self.op_type().to_string(),
communities: communities
}
)
.unwrap()
}
}
impl Perform for CreatePost {
fn op_type(&self) -> UserOperation {
UserOperation::CreatePost
}
fn perform(&self) -> String {
let conn = establish_connection();
let claims = match Claims::decode(&self.auth) {
Ok(claims) => claims.claims,
Err(e) => {
return self.error("Not logged in.");
}
};
let user_id = claims.id;
let iss = claims.iss;
let post_form = PostForm {
name: self.name.to_owned(),
url: self.url.to_owned(),
body: self.body.to_owned(),
community_id: self.community_id,
attributed_to: format!("{}/{}", iss, user_id),
updated: None
};
let inserted_post = match Post::create(&conn, &post_form) {
Ok(post) => post,
Err(e) => {
return self.error("Couldn't create Post");
}
};
serde_json::to_string(
&CreatePostResponse {
op: self.op_type().to_string(),
post: inserted_post
}
)
.unwrap()
}
}
impl Perform for GetPost {
fn op_type(&self) -> UserOperation {
UserOperation::GetPost
}
fn perform(&self) -> String {
let conn = establish_connection();
let post = match Post::read(&conn, self.id) {
Ok(post) => post,
Err(e) => {
return self.error("Couldn't find Post");
}
};
let comments = Comment::from_post(&conn, &post).unwrap();
// Return the jwt
serde_json::to_string(
&GetPostResponse {
op: self.op_type().to_string(),
post: post,
comments: comments
}
)
.unwrap()
}
}
impl Perform for GetCommunity {
fn op_type(&self) -> UserOperation {
UserOperation::GetCommunity
}
fn perform(&self) -> String {
let conn = establish_connection();
let community = match Community::read(&conn, self.id) {
Ok(community) => community,
Err(e) => {
return self.error("Couldn't find Community");
}
};
// Return the jwt
serde_json::to_string(
&GetCommunityResponse {
op: self.op_type().to_string(),
community: community
}
)
.unwrap()
}
}
impl Perform for CreateComment {
fn op_type(&self) -> UserOperation {
UserOperation::CreateComment
}
fn perform(&self) -> String {
let conn = establish_connection();
let claims = match Claims::decode(&self.auth) {
Ok(claims) => claims.claims,
Err(e) => {
return self.error("Not logged in.");
}
};
let user_id = claims.id;
let iss = claims.iss;
let comment_form = CommentForm {
content: self.content.to_owned(),
parent_id: self.parent_id.to_owned(),
post_id: self.post_id,
attributed_to: format!("{}/{}", iss, user_id),
updated: None
};
let inserted_comment = match Comment::create(&conn, &comment_form) {
Ok(comment) => comment,
Err(e) => {
return self.error("Couldn't create Post");
}
};
serde_json::to_string(
&CreateCommentResponse {
op: self.op_type().to_string(),
comment: inserted_comment
}
)
.unwrap()
}
}
// impl Handler<Login> for ChatServer {
// type Result = MessageResult<Login>;
// fn handle(&mut self, msg: Login, _: &mut Context<Self>) -> Self::Result {
// let conn = establish_connection();
// // Fetch that username / email
// let user: User_ = match User_::find_by_email_or_username(&conn, &msg.username_or_email) {
// Ok(user) => user,
// Err(e) => return MessageResult(
// Err(
// ErrorMessage {
// op: UserOperation::Login.to_string(),
// error: "Couldn't find that username or email".to_string()
// }
// )
// )
// };
// // Verify the password
// let valid: bool = verify(&msg.password, &user.password_encrypted).unwrap_or(false);
// if !valid {
// return MessageResult(
// Err(
// ErrorMessage {
// op: UserOperation::Login.to_string(),
// error: "Password incorrect".to_string()
// }
// )
// )
// }
// // Return the jwt
// MessageResult(
// Ok(
// LoginResponse {
// op: UserOperation::Login.to_string(),
// jwt: user.jwt()
// }
// )
// )
// }
// }
// impl Handler<Register> for ChatServer {
// type Result = MessageResult<Register>;
// fn handle(&mut self, msg: Register, _: &mut Context<Self>) -> Self::Result {
// let conn = establish_connection();
// // Make sure passwords match
// if msg.password != msg.password_verify {
// return MessageResult(
// Err(
// ErrorMessage {
// op: UserOperation::Register.to_string(),
// error: "Passwords do not match.".to_string()
// }
// )
// );
// }
// // Register the new user
// let user_form = UserForm {
// name: msg.username,
// email: msg.email,
// password_encrypted: msg.password,
// preferred_username: None,
// updated: None
// };
// // Create the user
// let inserted_user = match User_::create(&conn, &user_form) {
// Ok(user) => user,
// Err(e) => return MessageResult(
// Err(
// ErrorMessage {
// op: UserOperation::Register.to_string(),
// error: "User already exists.".to_string() // overwrite the diesel error
// }
// )
// )
// };
// // Return the jwt
// MessageResult(
// Ok(
// LoginResponse {
// op: UserOperation::Register.to_string(),
// jwt: inserted_user.jwt()
// }
// )
// )
// }
// }
// impl Handler<CreateCommunity> for ChatServer {
// type Result = MessageResult<CreateCommunity>;
// fn handle(&mut self, msg: CreateCommunity, _: &mut Context<Self>) -> Self::Result {
// let conn = establish_connection();
// let user_id = Claims::decode(&msg.auth).id;
// let community_form = CommunityForm {
// name: msg.name,
// updated: None
// };
// let community = match Community::create(&conn, &community_form) {
// Ok(community) => community,
// Err(e) => return MessageResult(
// Err(
// ErrorMessage {
// op: UserOperation::CreateCommunity.to_string(),
// error: "Community already exists.".to_string() // overwrite the diesel error
// }
// )
// )
// };
// MessageResult(
// Ok(
// CreateCommunityResponse {
// op: UserOperation::CreateCommunity.to_string(),
// community: community
// }
// )
// )
// }
// }
//
//
//
// /// Handler for `ListRooms` message.
// impl Handler<ListRooms> for ChatServer {
// type Result = MessageResult<ListRooms>;
// fn handle(&mut self, _: ListRooms, _: &mut Context<Self>) -> Self::Result {
// let mut rooms = Vec::new();
// for key in self.rooms.keys() {
// rooms.push(key.to_owned())
// }
// MessageResult(rooms)
// }
// }
// /// Join room, send disconnect message to old room
// /// send join message to new room
// impl Handler<Join> for ChatServer {
// type Result = ();
// fn handle(&mut self, msg: Join, _: &mut Context<Self>) {
// let Join { id, name } = msg;
// let mut rooms = Vec::new();
// // remove session from all rooms
// for (n, sessions) in &mut self.rooms {
// if sessions.remove(&id) {
// rooms.push(n.to_owned());
// }
// }
// // send message to other users
// for room in rooms {
// self.send_room_message(&room, "Someone disconnected", 0);
// }
// if self.rooms.get_mut(&name).is_none() {
// self.rooms.insert(name.clone(), HashSet::new());
// }
// self.send_room_message(&name, "Someone connected", id);
// self.rooms.get_mut(&name).unwrap().insert(id);
// }
// }