Add ability to change password

cmd/sojuctl/main.go

@@ -15,6 +15,7 @@ import (
 const usage = `usage: sojuctl [-config path] <action> [options...]
 
   create-user <username>	Create a new user
+  change-password <username> 	Change password for a user
   help				Show this help message
 `
 
@@ -72,6 +73,33 @@ func main() {
 		if err := db.CreateUser(&user); err != nil {
 			log.Fatalf("failed to create user: %v", err)
 		}
+	case "change-password":
+		username := flag.Arg(1)
+		if username == "" {
+			flag.Usage()
+			os.Exit(1)
+		}
+
+		fmt.Printf("New password: ")
+		password, err := terminal.ReadPassword(int(os.Stdin.Fd()))
+		if err != nil {
+			log.Fatalf("failed to read new password: %v", err)
+		}
+		fmt.Printf("\n")
+
+		hashed, err := bcrypt.GenerateFromPassword(password, bcrypt.DefaultCost)
+		if err != nil {
+			log.Fatalf("failed to hash password: %v", err)
+		}
+
+		user := soju.User{
+			Username: username,
+			Password: string(hashed),
+		}
+		if err := db.UpdatePassword(&user); err != nil {
+			log.Fatalf("failed to update password: %v", err)
+		}
+
 	default:
 		flag.Usage()
 		if cmd != "help" {

db.go

@@ -132,6 +132,18 @@ func (db *DB) CreateUser(user *User) error {
 	return err
 }
 
+func (db *DB) UpdatePassword(user *User) error {
+	db.lock.Lock()
+	defer db.lock.Unlock()
+
+	password := toStringPtr(user.Password)
+	_, err := db.db.Exec(`UPDATE User
+	SET password = ?
+	WHERE username = ?`,
+		password, user.Username)
+	return err
+}
+
 func (db *DB) ListNetworks(username string) ([]Network, error) {
 	db.lock.RLock()
 	defer db.lock.RUnlock()