// Copyright 2022 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package util import (	"errors"	"fmt") // Common Errors forming the base of our error system//// Many Errors returned by Gitea can be tested against these errors// using errors.Is.var (	ErrInvalidArgument  = errors.New("invalid argument")	ErrPermissionDenied = errors.New("permission denied")	ErrAlreadyExist     = errors.New("resource already exists")	ErrNotExist         = errors.New("resource does not exist")) // SilentWrap provides a simple wrapper for a wrapped error where the wrapped error message plays no part in the error message// Especially useful for "untyped" errors created with "errors.New(…)" that can be classified as 'invalid argument', 'permission denied', 'exists already', or 'does not exist'type SilentWrap struct {	Message string	Err     error} // Error returns the messagefunc (w SilentWrap) Error() string {	return w.Message} // Unwrap returns the underlying errorfunc (w SilentWrap) Unwrap() error {	return w.Err} // NewSilentWrapErrorf returns an error that formats as the given text but unwraps as the provided errorfunc NewSilentWrapErrorf(unwrap error, message string, args ...any) error {	if len(args) == 0 {		return SilentWrap{Message: message, Err: unwrap}	}	return SilentWrap{Message: fmt.Sprintf(message, args...), Err: unwrap}} // NewInvalidArgumentErrorf returns an error that formats as the given text but unwraps as an ErrInvalidArgumentfunc NewInvalidArgumentErrorf(message string, args ...any) error {	return NewSilentWrapErrorf(ErrInvalidArgument, message, args...)} // NewPermissionDeniedErrorf returns an error that formats as the given text but unwraps as an ErrPermissionDeniedfunc NewPermissionDeniedErrorf(message string, args ...any) error {	return NewSilentWrapErrorf(ErrPermissionDenied, message, args...)} // NewAlreadyExistErrorf returns an error that formats as the given text but unwraps as an ErrAlreadyExistfunc NewAlreadyExistErrorf(message string, args ...any) error {	return NewSilentWrapErrorf(ErrAlreadyExist, message, args...)} // NewNotExistErrorf returns an error that formats as the given text but unwraps as an ErrNotExistfunc NewNotExistErrorf(message string, args ...any) error {	return NewSilentWrapErrorf(ErrNotExist, message, args...)}