added server password, and flag in config to enable it

main.go

@@ -27,6 +27,7 @@ import (
 type Client struct {
 	nick             string
 	user             string
+	realname         string
 	conn             net.Conn
 	host             string
 	channels         map[string]*Channel
@@ -61,6 +62,8 @@ type Config struct {
 	Port               int             `json:"port"`
 	Webapiport         int             `json:"webapiport"`
 	Motd               string          `json:"motd"`
+	Enableserverpasswd bool            `json:"enableserverpassword"`
+	Serverpassword     string          `json:"serverpassword"`
 	Channels           []Channelconfig `json:"channels"`
 	Ops                []string        `json:"ops"`
 }
@@ -73,6 +76,8 @@ var (
 	cliMu              sync.RWMutex // mutex for clients
 	motdString         []string
 	motdFile           string
+	Enableserverpasswd bool
+	Serverpassword     string
 	db                 *sql.DB
 )
 
@@ -94,6 +99,8 @@ func loadConfig() (*Config, error) {
 		globalOps[cleanedNick] = true
 	}
 	motdFile = conf.Motd
+	Enableserverpasswd = conf.Enableserverpasswd
+	Serverpassword = conf.Serverpassword
 	return &conf, nil
 }
 func loadMOTD(filename string) error {
@@ -203,7 +210,23 @@ func handleConn(conn net.Conn) {
 					client.checkRegistration()
 				}
 			}
-
+		case "PASS":
+			if !Enableserverpasswd {
+				client.fwrite(":server 421 * PASS :Server password not enabled\r\n")
+				continue
+			}
+			if len(msg.Params) < 1 {
+				client.fwrite(":server 461 * PASS :Not enough parameters\r\n")
+				continue
+			}
+			if msg.Params[0] == Serverpassword {
+				client.saslComplete = true
+				client.saslRequired = false
+				client.fwrite(":server NOTICE * :Server password accepted\r\n")
+			} else {
+				client.fwrite(":server 464 * :Password incorrect\r\n")
+				return
+			}
 		case "CAP":
 			if len(msg.Params) < 1 {
 				client.fwrite(":server 461 %s CAP :Not enough parameters\r\n", client.nick)
@@ -271,6 +294,7 @@ func handleConn(conn net.Conn) {
 			if len(msg.Params) >= 4 {
 				uname := msg.Params[0]
 				client.user = uname
+				client.realname = msg.Params[3]
 				client.checkRegistration()
 			} else {
 				fmt.Fprintf(conn, ":server 461 * USER :Not enough parameters\r\n")