Create a user from command line

main.go

@@ -26,6 +26,7 @@ const DB_SCHEMA = 13
 var (
 	flagPort       int
 	flagVersion    bool
+	flagCreateUser bool
 	flagConfig     string
 
 	connectionManager ConnectionManager
@@ -44,6 +45,7 @@ func init() { // {{{
 	configFilename := os.Getenv("HOME") + "/.config/notes.yaml"
 	flag.IntVar(&flagPort, "port", 1371, "TCP port to listen on")
 	flag.BoolVar(&flagVersion, "version", false, "Shows Notes version and exists")
+	flag.BoolVar(&flagCreateUser, "createuser", false, "Create a user and exit")
 	flag.StringVar(&flagConfig, "config", configFilename, "Filename of configuration file")
 	flag.Parse()
 
@@ -72,6 +74,15 @@ func main() { // {{{
 		os.Exit(1)
 	}
 
+	if flagCreateUser {
+		err = createUser()
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+		os.Exit(0)
+	}
+
 	connectionManager = NewConnectionManager()
 	go connectionManager.BroadcastLoop()
 

user.go

@@ -3,6 +3,7 @@ package main
 import (
 	// Standard
 	"database/sql"
+	"fmt"
 )
 
 func (session Session) UpdatePassword(currPass, newPass string) (ok bool, err error) {
@@ -35,3 +36,38 @@ func (session Session) UpdatePassword(currPass, newPass string) (ok bool, err er
 
 	return rowsAffected > 0, nil
 }
+
+func createUser() (err error) {
+	var username, password string
+	fmt.Printf("Username: ")
+	fmt.Scanln(&username)
+	fmt.Printf("Password: ")
+	fmt.Scanln(&password)
+
+	err = CreateDbUser(username, password)
+	return
+}
+
+func CreateDbUser(username string, password string) (err error) {
+	var result sql.Result
+
+	result, err = db.Exec(`
+		INSERT INTO public.user(username, password)
+		VALUES(
+			$1,
+			password_hash(
+				/* salt in hex */
+				ENCODE(gen_random_bytes(16), 'hex'),
+
+				/* password */
+				$2::bytea
+			)
+		)
+	`,
+		username,
+		password,
+	)
+
+	_, err = result.RowsAffected()
+	return
+}