User model updates

also use sql.NullString to set access/refresh token

database/models/user.go

@@ -7,12 +7,12 @@ import (
 
 // User : User Model
 type User struct {
-	ID           uint `gorm:"primary_key"`
-	Email        sql.NullString
-	Login        string         `gorm:"index"`
-	Password     string         `gorm:"index"`
-	RefreshToken sql.NullString `gorm:"index"`
-	AccessToken  sql.NullString `gorm:"index"`
+	ID           uint           `gorm:"primary_key"`
+	Email        sql.NullString `gorm:uniqueIndex`
+	Login        string         `gorm:"uniqueIndex;not null"`
+	Password     string         `gorm:"index;not null"`
+	RefreshToken sql.NullString `gorm:"uniqueIndex"`
+	AccessToken  sql.NullString `gorm:"uniqueIndex"`
 	UpdatedAt    time.Time      `gorm:"autoUpdateTime`
 	CreatedAt    time.Time      `gorm:"autoCreateTime"`
 }

lib/tokens/jwt.go

@@ -1,6 +1,8 @@
 package tokens
 
 import (
+	"database/sql"
+
 	"github.com/bumi/lndhub.go/database/models"
 	"github.com/dgrijalva/jwt-go"
 	"github.com/labstack/echo/v4"
@@ -26,7 +28,7 @@ func GenerateAccessToken(c echo.Context, u *models.User) error {
 	if err != nil {
 		return err
 	}
-	u.AccessToken = t
+	u.AccessToken = sql.NullString{String: t}
 
 	return err
 }
@@ -41,7 +43,7 @@ func GenerateRefreshToken(c echo.Context, u *models.User) error {
 		return err
 	}
 
-	u.RefreshToken = rt
+	u.RefreshToken = sql.NullString{String: rt}
 
 	return err
 }