96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
package storage
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"net/url"
|
|
"os"
|
|
"reflect"
|
|
|
|
"code.gitea.io/gitea/modules/json"
|
|
)
|
|
|
|
// Mappable represents an interface that can MapTo another interface
|
|
type Mappable interface {
|
|
MapTo(v interface{}) error
|
|
}
|
|
|
|
// toConfig will attempt to convert a given configuration cfg into the provided exemplar type.
|
|
//
|
|
// It will tolerate the cfg being passed as a []byte or string of a json representation of the
|
|
// exemplar or the correct type of the exemplar itself
|
|
func toConfig(exemplar, cfg interface{}) (interface{}, error) {
|
|
// First of all check if we've got the same type as the exemplar - if so it's all fine.
|
|
if reflect.TypeOf(cfg).AssignableTo(reflect.TypeOf(exemplar)) {
|
|
return cfg, nil
|
|
}
|
|
|
|
// Now if not - does it provide a MapTo function we can try?
|
|
if mappable, ok := cfg.(Mappable); ok {
|
|
newVal := reflect.New(reflect.TypeOf(exemplar))
|
|
if err := mappable.MapTo(newVal.Interface()); err == nil {
|
|
return newVal.Elem().Interface(), nil
|
|
}
|
|
// MapTo has failed us ... let's try the json route ...
|
|
}
|
|
|
|
// OK we've been passed a byte array right?
|
|
configBytes, ok := cfg.([]byte)
|
|
if !ok {
|
|
// oh ... it's a string then?
|
|
var configStr string
|
|
|
|
configStr, ok = cfg.(string)
|
|
configBytes = []byte(configStr)
|
|
}
|
|
if !ok {
|
|
// hmm ... can we marshal it to json?
|
|
var err error
|
|
configBytes, err = json.Marshal(cfg)
|
|
ok = err == nil
|
|
}
|
|
if !ok {
|
|
// no ... we've tried hard enough at this point - throw an error!
|
|
return nil, ErrInvalidConfiguration{cfg: cfg}
|
|
}
|
|
|
|
// OK unmarshal the byte array into a new copy of the exemplar
|
|
newVal := reflect.New(reflect.TypeOf(exemplar))
|
|
if err := json.Unmarshal(configBytes, newVal.Interface()); err != nil {
|
|
// If we can't unmarshal it then return an error!
|
|
return nil, ErrInvalidConfiguration{cfg: cfg, err: err}
|
|
}
|
|
return newVal.Elem().Interface(), nil
|
|
}
|
|
|
|
var uninitializedStorage = discardStorage("uninitialized storage")
|
|
|
|
type discardStorage string
|
|
|
|
func (s discardStorage) Open(_ string) (Object, error) {
|
|
return nil, fmt.Errorf("%s", s)
|
|
}
|
|
|
|
func (s discardStorage) Save(_ string, _ io.Reader, _ int64) (int64, error) {
|
|
return 0, fmt.Errorf("%s", s)
|
|
}
|
|
|
|
func (s discardStorage) Stat(_ string) (os.FileInfo, error) {
|
|
return nil, fmt.Errorf("%s", s)
|
|
}
|
|
|
|
func (s discardStorage) Delete(_ string) error {
|
|
return fmt.Errorf("%s", s)
|
|
}
|
|
|
|
func (s discardStorage) URL(_, _ string) (*url.URL, error) {
|
|
return nil, fmt.Errorf("%s", s)
|
|
}
|
|
|
|
func (s discardStorage) IterateObjects(_ func(string, Object) error) error {
|
|
return fmt.Errorf("%s", s)
|
|
}
|