/
fs.go
86 lines (75 loc) · 1.76 KB
/
fs.go
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// Copyright 2021 eatmoreapple. All rights reserved.
// Use of this source code is governed by a GPL style
// license that can be found in the LICENSE file.
package regia
import (
"io"
"mime/multipart"
"os"
"path"
"sync"
)
type FileStorage interface {
Save(fileHeader *multipart.FileHeader) (string, error)
}
var _ FileStorage = &LocalFileStorage{}
type LocalFileStorage struct {
MediaRoot string
lock sync.RWMutex
}
// SetMediaRouter Set file base save path for LocalFileStorage
func (l *LocalFileStorage) SetMediaRouter(mediaRoot string) {
l.MediaRoot = mediaRoot
}
// Save implement FileStorage
// Uploads the form file to local
func (l *LocalFileStorage) Save(fileHeader *multipart.FileHeader) (string, error) {
src, err := fileHeader.Open()
if err != nil {
return "", err
}
defer src.Close()
dst, err := l.getAlternativeName(fileHeader.Filename)
if err != nil {
return "", err
}
dstFile, err := os.Create(dst)
if err != nil {
return "", err
}
defer dstFile.Close()
_, err = io.Copy(dstFile, src)
if err != nil {
return "", err
}
return dst, nil
}
// Return an alternative filename, by adding an underscore and a random 7
// character alphanumeric string (before the file extension, if one exists
// to the filename
func (l *LocalFileStorage) getAlternativeName(filename string) (string, error) {
l.lock.RLock()
defer l.lock.RUnlock()
for {
dst := path.Join(l.MediaRoot, filename)
exist, err := fileExists(dst)
if err != nil {
return "", err
}
if !exist {
return dst, err
}
filename = getRandomString(7) + filename
}
}
// check file if exists
func fileExists(filePath string) (bool, error) {
_, err := os.Stat(filePath)
if err == nil {
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return false, err
}