This repository has been archived by the owner on Sep 3, 2021. It is now read-only.
/
nickHandler.go
100 lines (89 loc) · 2.59 KB
/
nickHandler.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
package irc
import (
"fmt"
"go.uber.org/zap"
"math/rand"
"os"
"os/signal"
"strings"
"syscall"
"time"
)
type nickHandler struct {
preferred string
current string
letters []rune
checkingPreferred bool
logger *zap.SugaredLogger
}
func NewNickHandler(preferredNickname string, logger *zap.SugaredLogger) *nickHandler {
return &nickHandler{
preferred: preferredNickname,
current: preferredNickname,
letters: []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"),
logger: logger,
}
}
func (h *nickHandler) install(c *Connection) {
c.AddInboundHandler("432", h.erroneusNickame)
c.AddInboundHandler("433", h.nicknameInUse)
c.AddInboundHandler("436", h.nicknameCollision)
c.AddInboundHandler("NICK", h.nicknameChanged)
go h.monitorNickname(c)
}
func (h *nickHandler) nicknameChanged(_ *EventManager, c *Connection, m *Message) {
sourceNick := strings.SplitN(m.Source, "!", 2)[0]
destNick := m.Params[0]
if strings.HasPrefix(sourceNick, h.current) {
h.logger.Debugf("Nickname changed: %s", destNick)
h.current = destNick
} else if sourceNick == h.preferred {
h.logger.Debugf("Regained preferred nickname: %s", destNick)
c.SendRawf("NICK %s", h.preferred)
}
}
func (h *nickHandler) nicknameCollision(em *EventManager, c *Connection, m *Message) {
h.nicknameInUse(em, c, m)
}
func (h *nickHandler) nicknameInUse(em *EventManager, c *Connection, _ *Message) {
if !h.checkingPreferred {
h.logger.Debugf("Nickname in use %s", h.current)
h.updateNickname(em, c, fmt.Sprintf("%s%d", h.current, rand.Intn(10)))
} else {
h.checkingPreferred = false
}
}
func (h *nickHandler) erroneusNickame(em *EventManager, c *Connection, _ *Message) {
h.logger.Debugf("Erroneous nickname (%s), randomising.", h.current)
h.updateNickname(em, c, h.randSeq(8))
}
func (h *nickHandler) updateNickname(_ *EventManager, c *Connection, newNickname string) {
h.logger.Debugf("Changing nickname: %s", newNickname)
h.current = newNickname
c.SendRawf("NICK :%s", h.current)
}
func (h *nickHandler) randSeq(n int) string {
rand.Seed(time.Now().UnixNano())
b := make([]rune, n)
for i := range b {
b[i] = h.letters[rand.Intn(len(h.letters))]
}
return string(b)
}
func (h *nickHandler) monitorNickname(c *Connection) {
ticker := time.NewTicker(60000 * time.Millisecond)
sigWait := make(chan os.Signal, 1)
signal.Notify(sigWait, os.Interrupt)
signal.Notify(sigWait, syscall.SIGTERM)
for {
select {
case <-sigWait:
return
case <-ticker.C:
if h.current != h.preferred {
h.checkingPreferred = true
c.SendRawf("NICK %s", h.preferred)
}
}
}
}