Use accountdb with provided config (#2273)

* Fix #2272

* Ensure we only allow lowercase usernames using `create-account`

Co-authored-by: kegsay <kegan@matrix.org>

cmd/create-account/main.go

@@ -21,16 +21,15 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"regexp"
 	"strings"
 
+	"github.com/matrix-org/dendrite/setup/base"
 	"github.com/sirupsen/logrus"
-	"golang.org/x/crypto/bcrypt"
 	"golang.org/x/term"
 
 	"github.com/matrix-org/dendrite/setup"
-	"github.com/matrix-org/dendrite/setup/config"
 	"github.com/matrix-org/dendrite/userapi/api"
-	userdb "github.com/matrix-org/dendrite/userapi/storage"
 )
 
 const usage = `Usage: %s
@@ -63,6 +62,7 @@ var (
 	askPass            = flag.Bool("ask-pass", false, "Ask for the password to use")
 	isAdmin            = flag.Bool("admin", false, "Create an admin account")
 	resetPassword      = flag.Bool("reset-password", false, "Resets the password for the given username")
+	validUsernameRegex = regexp.MustCompile(`^[0-9a-z_\-=./]+$`)
 )
 
 func main() {
@@ -78,25 +78,21 @@ func main() {
 		os.Exit(1)
 	}
 
+	if !validUsernameRegex.MatchString(*username) {
+		logrus.Warn("Username can only contain characters a-z, 0-9, or '_-./='")
+		os.Exit(1)
+	}
+
 	pass := getPassword(password, pwdFile, pwdStdin, askPass, os.Stdin)
 
-	accountDB, err := userdb.NewDatabase(
-		&config.DatabaseOptions{
-			ConnectionString: cfg.UserAPI.AccountDatabase.ConnectionString,
-		},
-		cfg.Global.ServerName, bcrypt.DefaultCost,
-		cfg.UserAPI.OpenIDTokenLifetimeMS,
-		api.DefaultLoginTokenLifetime,
-	)
-	if err != nil {
-		logrus.Fatalln("Failed to connect to the database:", err.Error())
-	}
+	b := base.NewBaseDendrite(cfg, "create-account")
+	accountDB := b.CreateAccountsDB()
 
 	accType := api.AccountTypeUser
 	if *isAdmin {
 		accType = api.AccountTypeAdmin
 	}
-
+	var err error
 	if *resetPassword {
 		err = accountDB.SetPassword(context.Background(), *username, pass)
 		if err != nil {