mirror of
https://github.com/ergochat/ergo.git
synced 2024-11-14 07:59:31 +01:00
553 lines
10 KiB
Go
553 lines
10 KiB
Go
package irc
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import (
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"bufio"
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"crypto/rand"
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"crypto/tls"
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"encoding/binary"
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"fmt"
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"log"
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"net"
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"os"
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"sync"
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"time"
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)
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type Server struct {
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channels ChannelNameMap
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commands chan Command
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ctime time.Time
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motdFile string
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mutex *sync.Mutex
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name string
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operators map[string]string
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password string
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clients ClientNameMap
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}
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func NewServer(config *Config) *Server {
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server := &Server{
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channels: make(ChannelNameMap),
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clients: make(ClientNameMap),
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commands: make(chan Command),
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ctime: time.Now(),
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motdFile: config.MOTD,
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mutex: &sync.Mutex{},
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name: config.Name,
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operators: make(map[string]string),
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password: config.Password,
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}
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for _, opConf := range config.Operators {
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server.operators[opConf.Name] = opConf.Password
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}
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go server.receiveCommands()
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for _, listenerConf := range config.Listeners {
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go server.listen(listenerConf)
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}
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return server
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}
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func (server *Server) receiveCommands() {
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for command := range server.commands {
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if DEBUG_SERVER {
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log.Printf("%s → %s %+v", command.Client(), server, command)
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}
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client := command.Client()
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switch client.phase {
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case Authorization:
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authCommand, ok := command.(AuthServerCommand)
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if !ok {
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client.Destroy()
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return
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}
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authCommand.HandleAuthServer(server)
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case Registration:
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regCommand, ok := command.(RegServerCommand)
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if !ok {
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client.Destroy()
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return
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}
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regCommand.HandleRegServer(server)
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default:
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serverCommand, ok := command.(ServerCommand)
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if !ok {
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client.Reply(ErrUnknownCommand(server, command.Name()))
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return
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}
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client.Touch()
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serverCommand.HandleServer(server)
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}
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}
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}
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func (server *Server) Command(command Command) {
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server.commands <- command
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}
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func (server *Server) InitPhase() Phase {
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if server.password == "" {
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return Registration
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}
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return Authorization
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}
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func newListener(config ListenerConfig) (net.Listener, error) {
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if config.IsTLS() {
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certificate, err := tls.LoadX509KeyPair(config.Certificate, config.Key)
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if err != nil {
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return nil, err
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}
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return tls.Listen("tcp", config.Address, &tls.Config{
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Certificates: []tls.Certificate{certificate},
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PreferServerCipherSuites: true,
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})
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}
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return net.Listen("tcp", config.Address)
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}
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func (s *Server) listen(config ListenerConfig) {
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listener, err := newListener(config)
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if err != nil {
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log.Fatal("Server.Listen: ", err)
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}
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log.Print("Server.Listen: listening on ", config.Address)
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for {
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conn, err := listener.Accept()
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if err != nil {
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log.Print("Server.Accept: ", err)
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continue
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}
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if DEBUG_SERVER {
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log.Print("Server.Accept: ", conn.RemoteAddr())
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}
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go NewClient(s, conn)
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}
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}
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func (s *Server) GetOrMakeChannel(name string) *Channel {
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channel := s.channels[name]
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if channel == nil {
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channel = NewChannel(s, name)
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s.channels[name] = channel
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}
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return channel
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}
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func (s *Server) GenerateGuestNick() string {
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bytes := make([]byte, 8)
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for {
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_, err := rand.Read(bytes)
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if err != nil {
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panic(err)
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}
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randInt, n := binary.Uvarint(bytes)
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if n <= 0 {
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continue // TODO handle error
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}
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nick := fmt.Sprintf("guest%d", randInt)
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if s.clients[nick] == nil {
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return nick
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}
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}
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}
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//
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// server functionality
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//
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func (s *Server) tryRegister(c *Client) {
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if c.HasNick() && c.HasUsername() {
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c.phase = Normal
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c.loginTimer.Stop()
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c.Reply(
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RplWelcome(s, c),
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RplYourHost(s),
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RplCreated(s),
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RplMyInfo(s))
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s.MOTD(c)
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}
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}
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func (server *Server) MOTD(client *Client) {
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if server.motdFile == "" {
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client.Reply(ErrNoMOTD(server))
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return
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}
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file, err := os.Open(server.motdFile)
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if err != nil {
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client.Reply(ErrNoMOTD(server))
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return
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}
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defer file.Close()
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client.Reply(RplMOTDStart(server))
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reader := bufio.NewReader(file)
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for {
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line, err := reader.ReadString('\n')
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if err != nil {
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break
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}
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if len(line) > 80 {
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for len(line) > 80 {
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client.Reply(RplMOTD(server, line[0:80]))
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line = line[80:]
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}
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if len(line) > 0 {
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client.Reply(RplMOTD(server, line))
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}
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} else {
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client.Reply(RplMOTD(server, line))
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}
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}
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client.Reply(RplMOTDEnd(server))
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}
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func (s *Server) Id() string {
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return s.name
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}
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func (s *Server) String() string {
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return s.name
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}
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func (s *Server) Nick() string {
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return s.Id()
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}
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//
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// authorization commands
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//
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func (msg *ProxyCommand) HandleAuthServer(server *Server) {
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msg.Client().hostname = LookupHostname(msg.sourceIP)
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}
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func (msg *CapCommand) HandleAuthServer(server *Server) {
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// TODO
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}
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func (m *PassCommand) HandleAuthServer(s *Server) {
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client := m.Client()
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if s.password != m.password {
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client.Reply(ErrPasswdMismatch(s))
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client.Destroy()
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return
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}
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client.phase = Registration
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}
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//
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// registration commands
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//
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func (m *NickCommand) HandleRegServer(s *Server) {
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client := m.Client()
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if m.nickname == "" {
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client.Reply(ErrNoNicknameGiven(s))
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return
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}
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if s.clients[m.nickname] != nil {
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client.Reply(ErrNickNameInUse(s, m.nickname))
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return
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}
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client.nick = m.nickname
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s.clients.Add(client)
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client.Reply(RplNick(client, m.nickname))
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s.tryRegister(client)
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}
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func (m *UserMsgCommand) HandleRegServer(s *Server) {
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c := m.Client()
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c.username, c.realname = m.user, m.realname
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s.tryRegister(c)
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}
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//
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// normal commands
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//
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func (m *PassCommand) HandleServer(s *Server) {
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m.Client().Reply(ErrAlreadyRegistered(s))
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}
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func (m *PingCommand) HandleServer(s *Server) {
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m.Client().Reply(RplPong(s, m.Client()))
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}
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func (m *PongCommand) HandleServer(s *Server) {
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// no-op
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}
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func (m *NickCommand) HandleServer(s *Server) {
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c := m.Client()
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if m.nickname == "" {
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c.Reply(ErrNoNicknameGiven(s))
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return
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}
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if s.clients[m.nickname] != nil {
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c.Reply(ErrNickNameInUse(s, m.nickname))
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return
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}
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// Make reply before changing nick.
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reply := RplNick(c, m.nickname)
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s.clients.Remove(c)
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c.nick = m.nickname
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s.clients.Add(c)
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iclients := c.InterestedClients()
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for iclient := range iclients {
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iclient.Reply(reply)
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}
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}
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func (m *UserMsgCommand) HandleServer(s *Server) {
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m.Client().Reply(ErrAlreadyRegistered(s))
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}
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func (m *QuitCommand) HandleServer(server *Server) {
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client := m.Client()
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iclients := client.InterestedClients()
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iclients.Remove(client)
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for channel := range client.channels {
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channel.mutex.Lock()
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channel.members.Remove(client)
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channel.mutex.Unlock()
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}
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client.Reply(RplError(server, client))
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client.Destroy()
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if len(iclients) > 0 {
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reply := RplQuit(client, m.message)
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for iclient := range iclients {
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iclient.Reply(reply)
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}
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}
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}
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func (m *JoinCommand) HandleServer(s *Server) {
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c := m.Client()
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if m.zero {
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cmd := &PartCommand{}
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cmd.SetClient(c)
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for channel := range c.channels {
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channel.Command(cmd)
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}
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return
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}
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for name := range m.channels {
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s.GetOrMakeChannel(name).Command(m)
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}
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}
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func (m *PartCommand) HandleServer(s *Server) {
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for _, chname := range m.channels {
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channel := s.channels[chname]
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if channel == nil {
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m.Client().Reply(ErrNoSuchChannel(s, channel.name))
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continue
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}
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channel.Command(m)
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}
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}
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func (m *TopicCommand) HandleServer(s *Server) {
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channel := s.channels[m.channel]
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if channel == nil {
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m.Client().Reply(ErrNoSuchChannel(s, m.channel))
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return
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}
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channel.Command(m)
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}
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func (m *PrivMsgCommand) HandleServer(s *Server) {
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if m.TargetIsChannel() {
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channel := s.channels[m.target]
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if channel == nil {
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m.Client().Reply(ErrNoSuchChannel(s, m.target))
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return
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}
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channel.Command(m)
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return
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}
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target := s.clients[m.target]
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if target == nil {
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m.Client().Reply(ErrNoSuchNick(s, m.target))
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return
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}
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target.Reply(RplPrivMsg(m.Client(), target, m.message))
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if target.away {
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m.Client().Reply(RplAway(s, target))
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}
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}
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func (m *ModeCommand) HandleServer(s *Server) {
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client := m.Client()
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target := s.clients[m.nickname]
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if client == target {
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for _, change := range m.changes {
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if change.mode == Invisible {
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switch change.op {
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case Add:
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client.invisible = true
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case Remove:
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client.invisible = false
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}
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}
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}
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client.Reply(RplUModeIs(s, client))
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return
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}
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client.Reply(ErrUsersDontMatch(s))
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}
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func (m *WhoisCommand) HandleServer(server *Server) {
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client := m.Client()
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// TODO implement target query
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for _, mask := range m.masks {
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// TODO implement wildcard matching
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mclient := server.clients[mask]
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if mclient != nil {
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client.Reply(RplWhoisUser(server, mclient))
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}
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}
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client.Reply(RplEndOfWhois(server))
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}
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func (msg *ChannelModeCommand) HandleServer(server *Server) {
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client := msg.Client()
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channel := server.channels[msg.channel]
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if channel == nil {
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client.Reply(ErrNoSuchChannel(server, msg.channel))
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return
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}
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channel.Command(msg)
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}
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func whoChannel(client *Client, server *Server, channel *Channel) {
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for member := range channel.members {
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client.Reply(RplWhoReply(server, channel, member))
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}
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}
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func (msg *WhoCommand) HandleServer(server *Server) {
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client := msg.Client()
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// TODO implement wildcard matching
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mask := string(msg.mask)
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if mask == "" {
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for _, channel := range server.channels {
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whoChannel(client, server, channel)
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}
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} else if IsChannel(mask) {
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channel := server.channels[mask]
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if channel != nil {
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whoChannel(client, server, channel)
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}
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} else {
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mclient := server.clients[mask]
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if mclient != nil {
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client.Reply(RplWhoReply(server, mclient.channels.First(), mclient))
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}
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}
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client.Reply(RplEndOfWho(server, mask))
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}
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func (msg *OperCommand) HandleServer(server *Server) {
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client := msg.Client()
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if server.operators[msg.name] != msg.password {
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client.Reply(ErrPasswdMismatch(server))
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return
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}
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client.operator = true
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client.Reply(RplYoureOper(server))
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client.Reply(RplUModeIs(server, client))
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}
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func (msg *AwayCommand) HandleServer(server *Server) {
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client := msg.Client()
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client.away = msg.away
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client.awayMessage = msg.text
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if client.away {
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client.Reply(RplNowAway(server))
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} else {
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client.Reply(RplUnAway(server))
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}
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}
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func (msg *IsOnCommand) HandleServer(server *Server) {
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client := msg.Client()
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ison := make([]string, 0)
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for _, nick := range msg.nicks {
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if _, ok := server.clients[nick]; ok {
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ison = append(ison, nick)
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}
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}
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client.Reply(RplIsOn(server, ison))
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}
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func (msg *MOTDCommand) HandleServer(server *Server) {
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server.MOTD(msg.Client())
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}
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func (msg *NoticeCommand) HandleServer(server *Server) {
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if IsChannel(msg.target) {
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channel := server.channels[msg.target]
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if channel == nil {
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msg.Client().Reply(ErrNoSuchChannel(server, msg.target))
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return
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}
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channel.Command(msg)
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return
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}
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target := server.clients[msg.target]
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if target == nil {
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msg.Client().Reply(ErrNoSuchNick(server, msg.target))
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return
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}
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target.Reply(RplPrivMsg(msg.Client(), target, msg.message))
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}
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