add user login

internal/entities/user.go

@@ -3,7 +3,6 @@ package entities
 import (
 	"database/sql/driver"
 	"encoding/json"
-	"errors"
 	"time"
 
 	"github.com/google/uuid"
@@ -13,15 +12,19 @@ import (
 type UserRole string
 
 const (
-	RoleAdmin   UserRole = "admin"
-	RoleManager UserRole = "manager"
-	RoleCashier UserRole = "cashier"
-	RoleWaiter  UserRole = "waiter"
+	RoleSuperAdmin UserRole = "superadmin"
+	RoleAdmin      UserRole = "admin"
+	RoleManager    UserRole = "manager"
+	RoleCashier    UserRole = "cashier"
+	RoleWaiter     UserRole = "waiter"
 )
 
 type Permissions map[string]interface{}
 
 func (p Permissions) Value() (driver.Value, error) {
+	if p == nil {
+		return "{}", nil
+	}
 	return json.Marshal(p)
 }
 
@@ -31,12 +34,33 @@ func (p *Permissions) Scan(value interface{}) error {
 		return nil
 	}
 
-	bytes, ok := value.([]byte)
-	if !ok {
-		return errors.New("type assertion to []byte failed")
+	switch v := value.(type) {
+	case []byte:
+		if len(v) == 0 || string(v) == "{}" {
+			*p = make(Permissions)
+			return nil
+		}
+		// Try to unmarshal, if it fails, return empty permissions
+		if err := json.Unmarshal(v, p); err != nil {
+			*p = make(Permissions)
+			return nil
+		}
+		return nil
+	case string:
+		if v == "" || v == "{}" {
+			*p = make(Permissions)
+			return nil
+		}
+		// Try to unmarshal, if it fails, return empty permissions
+		if err := json.Unmarshal([]byte(v), p); err != nil {
+			*p = make(Permissions)
+			return nil
+		}
+		return nil
+	default:
+		*p = make(Permissions)
+		return nil
 	}
-
-	return json.Unmarshal(bytes, p)
 }
 
 type User struct {
@@ -60,6 +84,16 @@ func (u *User) BeforeCreate(tx *gorm.DB) error {
 	if u.ID == uuid.Nil {
 		u.ID = uuid.New()
 	}
+	if u.Permissions == nil {
+		u.Permissions = make(Permissions)
+	}
+	return nil
+}
+
+func (u *User) BeforeUpdate(tx *gorm.DB) error {
+	if u.Permissions == nil {
+		u.Permissions = make(Permissions)
+	}
 	return nil
 }