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|
package irc
import (
"errors"
"strings"
)
type Mask struct {
Nick string
Username string
Hostname string
Mask string
}
type Message struct {
Raw string
Tags map[string]string
Prefix *Mask
Command string
Params []string
}
func NewMessage() *Message {
return &Message{
Tags: make(map[string]string),
Prefix: &Mask{},
}
}
// GetParam - Get a param value, returning a default value if it doesn't exist
func (m *Message) GetParam(idx int, def string) string {
if idx < 0 || idx > len(m.Params)-1 {
return def
}
return m.Params[idx]
}
// GetParamU - Get a param value in uppercase, returning a default value if it doesn't exist
func (m *Message) GetParamU(idx int, def string) string {
return strings.ToUpper(m.GetParam(idx, def))
}
// ToLine - Convert the Message struct to its raw IRC line
func (m *Message) ToLine() string {
line := ""
if len(m.Tags) > 0 {
line += "@"
tagCount := 0
for tagName, tagVal := range m.Tags {
tagCount++
line += tagName
if tagVal != "" {
line += "=" + tagVal
}
if tagCount < len(m.Tags) {
line += ";"
}
}
}
if m.Prefix != nil && (m.Prefix.Nick != "" || m.Prefix.Username != "" || m.Prefix.Hostname != "") {
prefix := ""
if m.Prefix.Nick != "" {
prefix += m.Prefix.Nick
}
if m.Prefix.Username != "" && m.Prefix.Nick != "" {
prefix += "!" + m.Prefix.Username
} else if m.Prefix.Username != "" {
prefix += m.Prefix.Username
}
if m.Prefix.Hostname != "" && prefix != "" {
prefix += "@" + m.Prefix.Username
} else if m.Prefix.Hostname != "" {
prefix += m.Prefix.Hostname
}
if line != "" {
line += " :" + prefix
} else {
line += ":" + prefix
}
}
if line != "" {
line += " " + m.Command
} else {
line += m.Command
}
paramLen := len(m.Params)
for idx, param := range m.Params {
if idx == paramLen-1 && (strings.Contains(param, " ") || strings.HasPrefix(param, ":")) {
line += " :" + param
} else {
line += " " + param
}
}
return line
}
func createMask(maskStr string) *Mask {
mask := &Mask{
Mask: maskStr,
}
usernameStart := strings.Index(maskStr, "!")
hostStart := strings.Index(maskStr, "@")
if usernameStart == -1 && hostStart == -1 {
mask.Nick = maskStr
} else if usernameStart > -1 && hostStart > -1 {
mask.Nick = maskStr[0:usernameStart]
mask.Username = maskStr[usernameStart+1 : hostStart]
mask.Hostname = maskStr[hostStart+1:]
} else if usernameStart > -1 && hostStart == -1 {
mask.Nick = maskStr[0:usernameStart]
mask.Username = maskStr[usernameStart+1:]
} else if usernameStart == -1 && hostStart > -1 {
mask.Username = maskStr[0:hostStart]
mask.Hostname = maskStr[hostStart+1:]
}
return mask
}
// ParseLine - Turn a raw IRC line into a message
func ParseLine(input string) (*Message, error) {
line := strings.Trim(input, "\r\n")
message := NewMessage()
message.Raw = line
token := ""
rest := ""
token, rest = nextToken(line, false)
if token == "" {
return message, errors.New("Empty line")
}
// Tags. Starts with "@"
if token[0] == 64 {
tagsRaw := token[1:]
tags := strings.Split(tagsRaw, ";")
for _, tag := range tags {
parts := strings.Split(tag, "=")
if len(parts) > 0 && parts[0] == "" {
continue
}
if len(parts) == 1 {
message.Tags[parts[0]] = ""
} else {
message.Tags[parts[0]] = parts[1]
}
}
token, rest = nextToken(rest, false)
}
// Prefix. Starts with ":"
if token != "" && token[0] == 58 {
message.Prefix = createMask(token[1:])
token, rest = nextToken(rest, false)
} else {
message.Prefix = createMask("")
}
// Command
if token == "" {
return message, errors.New("Missing command")
}
message.Command = token
// Params
for {
token, rest = nextToken(rest, true)
if token == "" {
break
}
message.Params = append(message.Params, token)
}
return message, nil
}
func nextToken(s string, allowTrailing bool) (string, string) {
s = strings.TrimLeft(s, " ")
if len(s) == 0 {
return "", ""
}
// The last token (trailing) start with :
if allowTrailing && s[0] == 58 {
return s[1:], ""
}
token := ""
spaceIdx := strings.Index(s, " ")
if spaceIdx > -1 {
token = s[:spaceIdx]
s = s[spaceIdx+1:]
} else {
token = s
s = ""
}
return token, s
}
|
