dispatch/pkg/irc/message.go
2020-05-21 05:24:26 +02:00

123 lines
2.0 KiB
Go

package irc
import (
"strings"
)
type Message struct {
Tags map[string]string
Prefix string
Nick string
Command string
Params []string
}
func (m *Message) LastParam() string {
if len(m.Params) > 0 {
return m.Params[len(m.Params)-1]
}
return ""
}
func (m *Message) IsFromServer() bool {
return m.Nick == "" || strings.Contains(m.Nick, ".")
}
func (m *Message) ToCTCP() *CTCP {
return DecodeCTCP(m.LastParam())
}
func ParseMessage(line string) *Message {
msg := Message{}
if strings.HasPrefix(line, "@") {
next := strings.Index(line, " ")
if next == -1 {
return nil
}
tags := strings.Split(line[1:next], ";")
if len(tags) > 0 {
msg.Tags = map[string]string{}
for _, tag := range tags {
key, val := splitParam(tag)
if key == "" {
continue
}
if val != "" {
msg.Tags[key] = unescapeTag(val)
} else {
msg.Tags[key] = ""
}
}
}
for line[next+1] == ' ' {
next++
}
line = line[next+1:]
}
if strings.HasPrefix(line, ":") {
next := strings.Index(line, " ")
if next == -1 {
return nil
}
msg.Prefix = line[1:next]
if i := strings.Index(msg.Prefix, "!"); i > 0 {
msg.Nick = msg.Prefix[:i]
} else if i := strings.Index(msg.Prefix, "@"); i > 0 {
msg.Nick = msg.Prefix[:i]
} else {
msg.Nick = msg.Prefix
}
line = line[next+1:]
}
cmdEnd := len(line)
trailing := ""
if i := strings.Index(line, " :"); i >= 0 {
cmdEnd = i
trailing = line[i+2:]
}
cmd := strings.Fields(line[:cmdEnd])
if len(cmd) == 0 {
return nil
}
msg.Command = cmd[0]
if len(cmd) > 1 {
msg.Params = cmd[1:]
}
if cmdEnd != len(line) {
msg.Params = append(msg.Params, trailing)
}
return &msg
}
func splitParam(param string) (string, string) {
parts := strings.SplitN(param, "=", 2)
if len(parts) == 2 {
return parts[0], parts[1]
}
return parts[0], ""
}
var unescapeTagReplacer = strings.NewReplacer(
"\\:", ";",
"\\s", " ",
"\\\\", "\\",
"\\r", "\r",
"\\n", "\n",
)
func unescapeTag(s string) string {
return unescapeTagReplacer.Replace(s)
}