audiobookshelf/server/SocketAuthority.js

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const SocketIO = require('socket.io')
const Logger = require('./Logger')
class SocketAuthority {
constructor() {
this.Server = null
this.io = null
this.clients = {}
}
// returns an array of User.toJSONForPublic with `connections` for the # of socket connections
// a user can have many socket connections
getUsersOnline() {
const onlineUsersMap = {}
Object.values(this.clients).filter(c => c.user).forEach(client => {
if (onlineUsersMap[client.user.id]) {
onlineUsersMap[client.user.id].connections++
} else {
onlineUsersMap[client.user.id] = {
...client.user.toJSONForPublic(this.Server.playbackSessionManager.sessions, this.Server.db.libraryItems),
connections: 1
}
}
})
return Object.values(onlineUsersMap)
}
getClientsForUser(userId) {
return Object.values(this.clients).filter(c => c.user && c.user.id === userId)
}
// Emits event to all authorized clients
emitter(evt, data) {
for (const socketId in this.clients) {
if (this.clients[socketId].user) {
this.clients[socketId].socket.emit(evt, data)
}
}
}
// Emits event to all clients for a specific user
clientEmitter(userId, evt, data) {
const clients = this.getClientsForUser(userId)
if (!clients.length) {
return Logger.debug(`[Server] clientEmitter - no clients found for user ${userId}`)
}
clients.forEach((client) => {
if (client.socket) {
client.socket.emit(evt, data)
}
})
}
// Emits event to all admin user clients
adminEmitter(evt, data) {
for (const socketId in this.clients) {
if (this.clients[socketId].user && this.clients[socketId].user.isAdminOrUp) {
this.clients[socketId].socket.emit(evt, data)
}
}
}
initialize(Server) {
this.Server = Server
this.io = new SocketIO.Server(this.Server.server, {
cors: {
origin: '*',
methods: ["GET", "POST"]
}
})
this.io.on('connection', (socket) => {
this.clients[socket.id] = {
id: socket.id,
socket,
connected_at: Date.now()
}
socket.sheepClient = this.clients[socket.id]
Logger.info('[Server] Socket Connected', socket.id)
// Required for associating a User with a socket
socket.on('auth', (token) => this.authenticateSocket(socket, token))
// Scanning
socket.on('cancel_scan', this.cancelScan.bind(this))
// Logs
socket.on('set_log_listener', (level) => Logger.addSocketListener(socket, level))
socket.on('remove_log_listener', () => Logger.removeSocketListener(socket.id))
socket.on('fetch_daily_logs', () => this.Server.logManager.socketRequestDailyLogs(socket))
// Sent automatically from socket.io clients
socket.on('disconnect', (reason) => {
Logger.removeSocketListener(socket.id)
const _client = this.clients[socket.id]
if (!_client) {
Logger.warn(`[Server] Socket ${socket.id} disconnect, no client (Reason: ${reason})`)
} else if (!_client.user) {
Logger.info(`[Server] Unauth socket ${socket.id} disconnected (Reason: ${reason})`)
delete this.clients[socket.id]
} else {
Logger.debug('[Server] User Offline ' + _client.user.username)
this.adminEmitter('user_offline', _client.user.toJSONForPublic(this.Server.playbackSessionManager.sessions, this.Server.db.libraryItems))
const disconnectTime = Date.now() - _client.connected_at
Logger.info(`[Server] Socket ${socket.id} disconnected from client "${_client.user.username}" after ${disconnectTime}ms (Reason: ${reason})`)
delete this.clients[socket.id]
}
})
//
// Events for testing
//
socket.on('message_all_users', (payload) => {
// admin user can send a message to all authenticated users
// displays on the web app as a toast
const client = this.clients[socket.id] || {}
if (client.user && client.user.isAdminOrUp) {
this.emitter('admin_message', payload.message || '')
} else {
Logger.error(`[Server] Non-admin user sent the message_all_users event`)
}
})
socket.on('ping', () => {
const client = this.clients[socket.id] || {}
const user = client.user || {}
Logger.debug(`[Server] Received ping from socket ${user.username || 'No User'}`)
socket.emit('pong')
})
})
}
// When setting up a socket connection the user needs to be associated with a socket id
// for this the client will send a 'auth' event that includes the users API token
async authenticateSocket(socket, token) {
const user = await this.Server.auth.authenticateUser(token)
if (!user) {
Logger.error('Cannot validate socket - invalid token')
return socket.emit('invalid_token')
}
const client = this.clients[socket.id]
if (client.user !== undefined) {
Logger.debug(`[Server] Authenticating socket client already has user`, client.user.username)
}
client.user = user
if (!client.user.toJSONForBrowser) {
Logger.error('Invalid user...', client.user)
return
}
Logger.debug(`[Server] User Online ${client.user.username}`)
this.adminEmitter('user_online', client.user.toJSONForPublic(this.Server.playbackSessionManager.sessions, this.Server.db.libraryItems))
// Update user lastSeen
user.lastSeen = Date.now()
await this.Server.db.updateEntity('user', user)
const initialPayload = {
userId: client.user.id,
username: client.user.username,
librariesScanning: this.Server.scanner.librariesScanning
}
if (user.isAdminOrUp) {
initialPayload.usersOnline = this.getUsersOnline()
}
client.socket.emit('init', initialPayload)
}
logout(socketId) {
// Strip user and client from client and client socket
if (socketId && this.clients[socketId]) {
const client = this.clients[socketId]
const clientSocket = client.socket
Logger.debug(`[Server] Found user client ${clientSocket.id}, Has user: ${!!client.user}, Socket has client: ${!!clientSocket.sheepClient}`)
if (client.user) {
Logger.debug('[Server] User Offline ' + client.user.username)
this.adminEmitter('user_offline', client.user.toJSONForPublic(null, this.Server.db.libraryItems))
}
delete this.clients[socketId].user
if (clientSocket && clientSocket.sheepClient) delete this.clients[socketId].socket.sheepClient
} else if (socketId) {
Logger.warn(`[Server] No client for socket ${socketId}`)
}
}
cancelScan(id) {
Logger.debug('[Server] Cancel scan', id)
this.Server.scanner.setCancelLibraryScan(id)
}
}
module.exports = new SocketAuthority()