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