Add support for custom network on-connect commands

Some servers use custom IRC bots with custom commands for registering to
specific services after connection.

This adds support for setting custom raw IRC messages, that will be
sent after registering to a network.

It also adds support for a custom flag.Value type for string
slice flags (flags taking several string values).

db.go

@@ -3,6 +3,7 @@ package soju
 import (
 	"database/sql"
 	"fmt"
+	"strings"
 	"sync"
 
 	_ "github.com/mattn/go-sqlite3"
@@ -30,6 +31,7 @@ type Network struct {
 	Username        string
 	Realname        string
 	Pass            string
+	ConnectCommands []string
 	SASL            SASL
 }
 
@@ -63,6 +65,7 @@ CREATE TABLE Network (
 	username VARCHAR(255),
 	realname VARCHAR(255),
 	pass VARCHAR(255),
+	connect_commands VARCHAR(1023),
 	sasl_mechanism VARCHAR(255),
 	sasl_plain_username VARCHAR(255),
 	sasl_plain_password VARCHAR(255),
@@ -82,6 +85,7 @@ CREATE TABLE Channel (
 
 var migrations = []string{
 	"", // migration #0 is reserved for schema initialization
+	"ALTER TABLE Network ADD COLUMN connect_commands VARCHAR(1023)",
 }
 
 type DB struct {
@@ -233,7 +237,7 @@ func (db *DB) ListNetworks(username string) ([]Network, error) {
 	defer db.lock.RUnlock()
 
 	rows, err := db.db.Query(`SELECT id, name, addr, nick, username, realname, pass,
-			sasl_mechanism, sasl_plain_username, sasl_plain_password
+			connect_commands, sasl_mechanism, sasl_plain_username, sasl_plain_password
 		FROM Network
 		WHERE user = ?`,
 		username)
@@ -245,10 +249,10 @@ func (db *DB) ListNetworks(username string) ([]Network, error) {
 	var networks []Network
 	for rows.Next() {
 		var net Network
-		var name, username, realname, pass *string
+		var name, username, realname, pass, connectCommands *string
 		var saslMechanism, saslPlainUsername, saslPlainPassword *string
 		err := rows.Scan(&net.ID, &name, &net.Addr, &net.Nick, &username, &realname,
-			&pass, &saslMechanism, &saslPlainUsername, &saslPlainPassword)
+			&pass, &connectCommands, &saslMechanism, &saslPlainUsername, &saslPlainPassword)
 		if err != nil {
 			return nil, err
 		}
@@ -256,6 +260,9 @@ func (db *DB) ListNetworks(username string) ([]Network, error) {
 		net.Username = fromStringPtr(username)
 		net.Realname = fromStringPtr(realname)
 		net.Pass = fromStringPtr(pass)
+		if connectCommands != nil {
+			net.ConnectCommands = strings.Split(*connectCommands, "\r\n")
+		}
 		net.SASL.Mechanism = fromStringPtr(saslMechanism)
 		net.SASL.Plain.Username = fromStringPtr(saslPlainUsername)
 		net.SASL.Plain.Password = fromStringPtr(saslPlainPassword)
@@ -276,6 +283,7 @@ func (db *DB) StoreNetwork(username string, network *Network) error {
 	netUsername := toStringPtr(network.Username)
 	realname := toStringPtr(network.Realname)
 	pass := toStringPtr(network.Pass)
+	connectCommands := toStringPtr(strings.Join(network.ConnectCommands, "\r\n"))
 
 	var saslMechanism, saslPlainUsername, saslPlainPassword *string
 	if network.SASL.Mechanism != "" {
@@ -292,18 +300,18 @@ func (db *DB) StoreNetwork(username string, network *Network) error {
 	var err error
 	if network.ID != 0 {
 		_, err = db.db.Exec(`UPDATE Network
-			SET name = ?, addr = ?, nick = ?, username = ?, realname = ?, pass = ?,
+			SET name = ?, addr = ?, nick = ?, username = ?, realname = ?, pass = ?, connect_commands = ?,
 				sasl_mechanism = ?, sasl_plain_username = ?, sasl_plain_password = ?
 			WHERE id = ?`,
-			netName, network.Addr, network.Nick, netUsername, realname, pass,
+			netName, network.Addr, network.Nick, netUsername, realname, pass, connectCommands,
 			saslMechanism, saslPlainUsername, saslPlainPassword, network.ID)
 	} else {
 		var res sql.Result
 		res, err = db.db.Exec(`INSERT INTO Network(user, name, addr, nick, username,
-				realname, pass, sasl_mechanism, sasl_plain_username,
+				realname, pass, connect_commands, sasl_mechanism, sasl_plain_username,
 				sasl_plain_password)
-			VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+			VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
-			username, netName, network.Addr, network.Nick, netUsername, realname, pass,
+			username, netName, network.Addr, network.Nick, netUsername, realname, pass, connectCommands,
 			saslMechanism, saslPlainUsername, saslPlainPassword)
 		if err != nil {
 			return err

service.go

@@ -104,7 +104,7 @@ func init() {
 		"network": {
 			children: serviceCommandSet{
 				"create": {
-					usage:  "-addr <addr> [-name name] [-username username] [-pass pass] [-realname realname] [-nick nick]",
+					usage:  "-addr <addr> [-name name] [-username username] [-pass pass] [-realname realname] [-nick nick] [[-connect-command command] ...]",
 					desc:   "add a new network",
 					handle: handleServiceCreateNetwork,
 				},
@@ -174,6 +174,17 @@ func newFlagSet() *flag.FlagSet {
 	return fs
 }
 
+type stringSliceVar []string
+
+func (v *stringSliceVar) String() string {
+	return fmt.Sprint([]string(*v))
+}
+
+func (v *stringSliceVar) Set(s string) error {
+	*v = append(*v, s)
+	return nil
+}
+
 func handleServiceCreateNetwork(dc *downstreamConn, params []string) error {
 	fs := newFlagSet()
 	addr := fs.String("addr", "", "")
@@ -182,6 +193,8 @@ func handleServiceCreateNetwork(dc *downstreamConn, params []string) error {
 	pass := fs.String("pass", "", "")
 	realname := fs.String("realname", "", "")
 	nick := fs.String("nick", "", "")
+	var connectCommands stringSliceVar
+	fs.Var(&connectCommands, "connect-command", "")
 
 	if err := fs.Parse(params); err != nil {
 		return err
@@ -190,6 +203,13 @@ func handleServiceCreateNetwork(dc *downstreamConn, params []string) error {
 		return fmt.Errorf("flag -addr is required")
 	}
 
+	for _, command := range connectCommands {
+		_, err := irc.ParseMessage(command)
+		if err != nil {
+			return fmt.Errorf("flag -connect-command must be a valid raw irc command string: %q: %v", command, err)
+		}
+	}
+
 	if *nick == "" {
 		*nick = dc.nick
 	}
@@ -202,6 +222,7 @@ func handleServiceCreateNetwork(dc *downstreamConn, params []string) error {
 		Pass:            *pass,
 		Realname:        *realname,
 		Nick:            *nick,
+		ConnectCommands: connectCommands,
 	})
 	if err != nil {
 		return fmt.Errorf("could not create network: %v", err)

upstream.go

@@ -1189,6 +1189,15 @@ func (uc *upstreamConn) runUntilRegistered() error {
 		}
 	}
 
+	for _, command := range uc.network.ConnectCommands {
+		m, err := irc.ParseMessage(command)
+		if err != nil {
+			uc.logger.Printf("failed to parse connect command %q: %v", command, err)
+		} else {
+			uc.SendMessage(m)
+		}
+	}
+
 	return nil
 }