add "Added By" for books

internal/api/routes.go

@@ -30,7 +30,12 @@ func PostBookHandler(c *gin.Context, db *gorm.DB) {
 		manageBindingError(c, err)
 		return
 	}
-	bookDb := book.toBook()
+	user, fetchUserErr := getAuthenticatedUser(c, db)
+	if fetchUserErr != nil {
+		manageDefaultError(c, err)
+		return
+	}
+	bookDb := book.toBook(&user)
 	err = db.Model(&model.Book{}).Save(&bookDb).Error
 	if err != nil {
 		manageDefaultError(c, err)
@@ -90,6 +95,16 @@ func isUserAndPasswordOk(db *gorm.DB, username string, password string) bool {
 	return err == nil
 }
 
+func getAuthenticatedUser(c *gin.Context, db *gorm.DB) (model.User, error) {
+	var user model.User
+	username, userIsInContext := c.Get("user")
+	if !userIsInContext {
+		return user, errors.New("User not found in context")
+	}
+	res := db.Where("name = ?", username).First(&user)
+	return user, res.Error
+}
+
 func manageBindingError(c *gin.Context, err error) {
 	var ve validator.ValidationErrors
 	if errors.As(err, &ve) {