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|
package server
import (
"fmt"
"log"
"net"
"go.rctt.net/solec/core"
)
type User struct {
Name string
Conns map[net.Conn]struct{}
Channels map[string]*Channel
}
func NewUser(conn net.Conn, name string) User {
u := User{
Name: name,
Conns: make(map[net.Conn]struct{}),
Channels: make(map[string]*Channel),
}
u.Conns[conn] = struct{}{}
return u
}
func (u *User) Send(senderConn net.Conn, payload core.Wrapper) error {
for c := range u.Conns {
if c == senderConn {
continue
}
if err := core.Send(c, payload); err != nil {
return err
}
}
return nil
}
func (s *Server) handleUserConn(conn net.Conn) {
name, err := s.performUserAuth(conn)
if err != nil {
log.Println("user auth error:", err)
return
}
s.usersMu.Lock()
user, ok := s.users[name]
if ok {
log.Println("next connection from user:", user.Name)
user.Conns[conn] = struct{}{}
} else {
log.Println("initial connection from user:", name)
user = NewUser(conn, name)
s.users[name] = user
}
s.usersMu.Unlock()
defer func() {
s.usersMu.Lock()
log.Println("client disconnected: ", user.Name)
delete(s.users[user.Name].Conns, conn)
if len(s.users[user.Name].Conns) == 0 {
log.Println("all connections closed for user:", user.Name)
delete(s.users, user.Name)
}
s.usersMu.Unlock()
}()
if err := s.readUserInput(&user, conn); err != nil {
log.Println(err)
}
}
func (s *Server) performUserAuth(conn net.Conn) (string, error) {
clientPayload, err := core.Decode(conn)
if err != nil {
return "", err
}
clientAuth, ok := clientPayload.(core.UserAuth)
if !ok {
return "", core.ErrUnexpectedPayloadType
}
// For testing ---
if clientAuth.Pass != "valid" {
if err := core.Send(conn, core.Error{core.ErrorAuthFailed}); err != nil {
log.Println("cannot send auth error:", err)
}
return "", core.ErrAuthInvalidPassword
}
// ---
if err := core.Send(conn, core.Success{}); err != nil {
return "", err
}
return clientAuth.Name, nil
}
func (s *Server) readUserInput(user *User, conn net.Conn) error {
for {
payload, err := core.Decode(conn)
if err != nil {
return err
}
if err := s.handleUserPayload(user, conn, payload); err != nil {
log.Print("handler error: ", err)
}
}
}
func (s *Server) handleUserPayload(user *User, sender net.Conn, payload any) error {
switch v := payload.(type) {
case core.Message:
return s.handleMessage(sender, core.ConnTypeUser, v)
case core.Usermode:
return s.handleUsermode(user, sender, v)
case core.History:
return s.handleHistory(user, sender, v)
default:
return core.ErrUnexpectedPayloadType
}
}
func (s *Server) handleUsermode(user *User, conn net.Conn, mode core.Usermode) error {
addr, err := core.ReadAddr(mode.UserAddr)
if err != nil {
return err
}
if user.Name != addr.Channel {
log.Println("unauthorized")
return user.Send(conn, core.Error{core.ErrorUnauthorized})
}
s.channelsMu.RLock()
channel, ok := s.channels[mode.ChannelName]
if !ok {
log.Println("not found", addr.Channel)
return user.Send(conn, core.Error{core.ErrorNotFound})
}
s.channelsMu.RUnlock()
switch mode.Mode {
case core.UsermodeNone:
channel.Remove(user)
case core.UsermodeInChannel:
channel.Add(user)
}
return nil
}
// TODO: Replace user.Send(error) with conn.Send()
// TODO: Better errors
func (s *Server) handleHistory(user *User, conn net.Conn, hist core.History) error {
addr, err := core.ReadAddr(hist.Channel)
if err != nil {
fmt.Println("cannot parse address:", err)
return user.Send(conn, core.Error{core.ErrorNotFound})
}
if _, ok := user.Channels[addr.Channel]; !ok {
fmt.Println("cannot get message history: not authorized")
return user.Send(conn, core.Error{core.ErrorNotFound})
}
messages, err := s.Storage.Read(hist.Channel, hist.Since, int(hist.Count), int(hist.Offset))
if err != nil {
fmt.Println("cannot get message history:", err)
return user.Send(conn, core.Error{core.ErrorNotFound})
}
for _, m := range messages {
data, err := core.Encode(m)
if err != nil {
return err
}
if _, err := conn.Write(data); err != nil {
return err
}
}
return nil
}
|
