package irc import ( "fmt" "net" "time" ) const ( LOGIN_TIMEOUT = time.Minute / 2 // how long the client has to login IDLE_TIMEOUT = time.Minute // how long before a client is considered idle QUIT_TIMEOUT = time.Minute // how long after idle before a client is kicked ) type Client struct { atime time.Time authorized bool awayMessage Text capabilities CapabilitySet capState CapState channels ChannelSet commands chan Command ctime time.Time flags map[UserMode]bool hasQuit bool hops uint hostname Name idleTimer *time.Timer loginTimer *time.Timer nick Name quitTimer *time.Timer realname Text registered bool server *Server socket *Socket username Name } func NewClient(server *Server, conn net.Conn) *Client { now := time.Now() client := &Client{ atime: now, authorized: server.password == nil, capState: CapNone, capabilities: make(CapabilitySet), channels: make(ChannelSet), commands: make(chan Command), ctime: now, flags: make(map[UserMode]bool), server: server, } client.socket = NewSocket(conn, client.commands) client.loginTimer = time.AfterFunc(LOGIN_TIMEOUT, client.connectionTimeout) go client.run() return client } // // command goroutine // func (client *Client) run() { for command := range client.commands { if checkPass, ok := command.(checkPasswordCommand); ok { checkPass.LoadPassword(client.server) // Block the client thread while handling a potentially expensive // password bcrypt operation. Since the server is single-threaded // for commands, we don't want the server to perform the bcrypt, // blocking anyone else from sending commands until it // completes. This could be a form of DoS if handled naively. checkPass.CheckPassword() } command.SetClient(client) client.server.commands <- command } } func (client *Client) connectionTimeout() { client.commands <- NewQuitCommand("connection timeout") } // // idle timer goroutine // func (client *Client) connectionIdle() { client.server.idle <- client } // // server goroutine // func (client *Client) Active() { client.atime = time.Now() } func (client *Client) Touch() { if client.quitTimer != nil { client.quitTimer.Stop() } if client.idleTimer == nil { client.idleTimer = time.AfterFunc(IDLE_TIMEOUT, client.connectionIdle) } else { client.idleTimer.Reset(IDLE_TIMEOUT) } } func (client *Client) Idle() { client.Reply(RplPing(client)) if client.quitTimer == nil { client.quitTimer = time.AfterFunc(QUIT_TIMEOUT, client.connectionTimeout) } else { client.quitTimer.Reset(QUIT_TIMEOUT) } } func (client *Client) Register() { if client.registered { return } client.registered = true client.loginTimer.Stop() client.Touch() } func (client *Client) destroy() { // clean up channels for channel := range client.channels { channel.Quit(client) } // clean up server client.server.clients.Remove(client) // clean up self if client.loginTimer != nil { client.loginTimer.Stop() } if client.idleTimer != nil { client.idleTimer.Stop() } if client.quitTimer != nil { client.quitTimer.Stop() } client.socket.Close() Log.debug.Printf("%s: destroyed", client) } func (client *Client) IdleTime() time.Duration { return time.Since(client.atime) } func (client *Client) SignonTime() int64 { return client.ctime.Unix() } func (client *Client) IdleSeconds() uint64 { return uint64(client.IdleTime().Seconds()) } func (client *Client) HasNick() bool { return client.nick != "" } func (client *Client) HasUsername() bool { return client.username != "" } // func (c *Client) ModeString() (str string) { for flag := range c.flags { str += flag.String() } if len(str) > 0 { str = "+" + str } return } func (c *Client) UserHost() Name { username := "*" if c.HasUsername() { username = c.username.String() } return Name(fmt.Sprintf("%s!%s@%s", c.Nick(), username, c.hostname)) } func (c *Client) Nick() Name { if c.HasNick() { return c.nick } return Name("*") } func (c *Client) Id() Name { return c.UserHost() } func (c *Client) String() string { return c.Id().String() } func (client *Client) Friends() ClientSet { friends := make(ClientSet) friends.Add(client) for channel := range client.channels { for member := range channel.members { friends.Add(member) } } return friends } func (client *Client) SetNickname(nickname Name) { if client.HasNick() { Log.error.Printf("%s nickname already set!", client) return } client.nick = nickname client.server.clients.Add(client) } func (client *Client) ChangeNickname(nickname Name) { // Make reply before changing nick to capture original source id. reply := RplNick(client, nickname) client.server.clients.Remove(client) client.server.whoWas.Append(client) client.nick = nickname client.server.clients.Add(client) for friend := range client.Friends() { friend.Reply(reply) } } func (client *Client) Reply(reply string, args ...interface{}) { if len(args) > 0 { reply = fmt.Sprintf(reply, args...) } client.socket.Write(reply) } func (client *Client) Quit(message Text) { if client.hasQuit { return } client.hasQuit = true client.Reply(RplError("quit")) client.server.whoWas.Append(client) friends := client.Friends() friends.Remove(client) client.destroy() if len(friends) > 0 { reply := RplQuit(client, message) for friend := range friends { friend.Reply(reply) } } }