xirc: encode tokens in GenerateIsupport

downstream.go

@@ -1496,7 +1496,7 @@ func (dc *downstreamConn) welcome(ctx context.Context) error {
 		isupport = append(isupport, "BOT=B")
 	}
 	if title := dc.srv.Config().Title; dc.network == nil && title != "" {
-		isupport = append(isupport, "NETWORK="+encodeISUPPORT(title))
+		isupport = append(isupport, "NETWORK="+title)
 	}
 	if dc.network == nil && !dc.isMultiUpstream {
 		isupport = append(isupport, "WHOX")

irc.go

@@ -592,12 +592,6 @@ func generateWHOXReply(prefix *irc.Prefix, nick, fields string, info *whoxInfo)
 	}
 }
 
-var isupportEncoder = strings.NewReplacer(" ", "\\x20", "\\", "\\x5C")
-
-func encodeISUPPORT(s string) string {
-	return isupportEncoder.Replace(s)
-}
-
 type capRegistry struct {
 	Available map[string]string
 	Enabled   map[string]struct{}

xirc/genmsg.go

@@ -84,6 +84,7 @@ func (js *joinSorter) Swap(i, j int) {
 func GenerateIsupport(prefix *irc.Prefix, nick string, tokens []string) []*irc.Message {
 	maxTokens := maxMessageParams - 2 // 2 reserved params: nick + text
 
+	// TODO: take into account maxMessageLength as well
 	var msgs []*irc.Message
 	for len(tokens) > 0 {
 		var msgTokens []string
@@ -95,16 +96,23 @@ func GenerateIsupport(prefix *irc.Prefix, nick string, tokens []string) []*irc.M
 			tokens = nil
 		}
 
+		encodedTokens := make([]string, len(msgTokens))
+		for i, tok := range msgTokens {
+			encodedTokens[i] = isupportEncoder.Replace(tok)
+		}
+
 		msgs = append(msgs, &irc.Message{
 			Prefix:  prefix,
 			Command: irc.RPL_ISUPPORT,
-			Params:  append(append([]string{nick}, msgTokens...), "are supported"),
+			Params:  append(append([]string{nick}, encodedTokens...), "are supported"),
 		})
 	}
 
 	return msgs
 }
 
+var isupportEncoder = strings.NewReplacer(" ", "\\x20", "\\", "\\x5C")
+
 func GenerateMOTD(prefix *irc.Prefix, nick string, motd string) []*irc.Message {
 	var msgs []*irc.Message
 	msgs = append(msgs, &irc.Message{