soju/downstream.go

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package jounce
import (
"fmt"
"io"
"net"
"gopkg.in/irc.v3"
)
type ircError struct {
Message *irc.Message
}
func newUnknownCommandError(cmd string) ircError {
return ircError{&irc.Message{
Command: irc.ERR_UNKNOWNCOMMAND,
Params: []string{
"*",
cmd,
"Unknown command",
},
}}
}
func newNeedMoreParamsError(cmd string) ircError {
return ircError{&irc.Message{
Command: irc.ERR_NEEDMOREPARAMS,
Params: []string{
"*",
cmd,
"Not enough parameters",
},
}}
}
func (err ircError) Error() string {
return err.Message.String()
}
type downstreamConn struct {
net net.Conn
irc *irc.Conn
srv *Server
registered bool
closed bool
nick string
username string
realname string
}
func (c *downstreamConn) Close() error {
if err := c.net.Close(); err != nil {
return err
}
c.closed = true
return nil
}
func (c *downstreamConn) WriteMessage(msg *irc.Message) error {
msg.Prefix = c.srv.prefix()
return c.irc.WriteMessage(msg)
}
func (c *downstreamConn) handleMessage(msg *irc.Message) error {
switch msg.Command {
case "PING":
// TODO: handle params
return c.WriteMessage(&irc.Message{
Command: "PONG",
Params: []string{c.srv.Hostname},
})
default:
if c.registered {
return c.handleMessageRegistered(msg)
} else {
return c.handleMessageUnregistered(msg)
}
}
}
func (c *downstreamConn) handleMessageUnregistered(msg *irc.Message) error {
switch msg.Command {
case "NICK":
if len(msg.Params) != 1 {
return newNeedMoreParamsError(msg.Command)
}
c.nick = msg.Params[0]
case "USER":
if len(msg.Params) != 4 {
return newNeedMoreParamsError(msg.Command)
}
c.username = "~" + msg.Params[0]
c.realname = msg.Params[3]
case "QUIT":
return c.Close()
default:
return newUnknownCommandError(msg.Command)
}
if c.username != "" && c.nick != "" {
return c.register()
}
return nil
}
func (c *downstreamConn) register() error {
c.registered = true
err := c.WriteMessage(&irc.Message{
Command: irc.RPL_WELCOME,
Params: []string{c.nick, "Welcome to jounce, " + c.nick},
})
if err != nil {
return err
}
err = c.WriteMessage(&irc.Message{
Command: irc.RPL_YOURHOST,
Params: []string{c.nick, "Your host is " + c.srv.Hostname},
})
if err != nil {
return err
}
err = c.WriteMessage(&irc.Message{
Command: irc.RPL_CREATED,
Params: []string{c.nick, "This server was created <datetime>"}, // TODO
})
if err != nil {
return err
}
err = c.WriteMessage(&irc.Message{
Command: irc.RPL_MYINFO,
Params: []string{c.nick, c.srv.Hostname, "unknown", "aiwroO", "OovaimnqpsrtklbeI"},
})
if err != nil {
return err
}
err = c.WriteMessage(&irc.Message{
Command: irc.ERR_NOMOTD,
Params: []string{c.nick, "No MOTD"},
})
if err != nil {
return err
}
return nil
}
func (c *downstreamConn) handleMessageRegistered(msg *irc.Message) error {
switch msg.Command {
case "NICK", "USER":
return ircError{&irc.Message{
Command: irc.ERR_ALREADYREGISTERED,
Params: []string{
c.nick,
"You may not reregister",
},
}}
case "QUIT":
return c.Close()
default:
return newUnknownCommandError(msg.Command)
}
}
func handleConn(s *Server, netConn net.Conn) error {
s.Logger.Printf("Handling connection from %v", netConn.RemoteAddr())
c := downstreamConn{net: netConn, irc: irc.NewConn(netConn), srv: s}
defer c.Close()
for {
msg, err := c.irc.ReadMessage()
if err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("failed to read IRC command: %v", err)
}
s.Logger.Printf("Downstream message: %v", msg)
err = c.handleMessage(msg)
if ircErr, ok := err.(ircError); ok {
ircErr.Message.Prefix = s.prefix()
if err := c.WriteMessage(ircErr.Message); err != nil {
return fmt.Errorf("failed to write IRC reply: %v", err)
}
} else if err != nil {
return fmt.Errorf("failed to handle IRC command %q: %v", msg.Command, err)
}
if c.closed {
return nil
}
}
return c.Close()
}