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filesystem.go
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filesystem.go
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package fsutil
import (
"archive/zip"
"bytes"
"io"
"net/http"
"os"
"path"
"path/filepath"
)
const (
// sniff Length, use for detect file mime type
MimeSniffLen = 512
)
var (
// refer net/http package
imageMimeTypes = map[string]string{
"bmp": "image/bmp",
"gif": "image/gif",
"ief": "image/ief",
"jpg": "image/jpeg",
// "jpe": "image/jpeg",
"jpeg": "image/jpeg",
"png": "image/png",
"svg": "image/svg+xml",
"ico": "image/x-icon",
"webp": "image/webp",
}
)
// var (
// ReadFile = ioutil.ReadFile
// )
// FileExists reports whether the named file or directory exists.
// Deprecated
// please use PathExists() or IsFile() instead it
func FileExists(path string) bool {
return PathExists(path)
}
// PathExists reports whether the named file or directory exists.
func PathExists(path string) bool {
if path == "" {
return false
}
if _, err := os.Stat(path); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
// IsDir reports whether the named directory exists.
func IsDir(path string) bool {
if path == "" {
return false
}
if fi, err := os.Stat(path); err == nil {
return fi.IsDir()
}
return false
}
// IsFile reports whether the named file or directory exists.
func IsFile(path string) bool {
if path == "" {
return false
}
if fi, err := os.Stat(path); err == nil {
return !fi.IsDir()
}
return false
}
// IsAbsPath is abs path.
func IsAbsPath(filepath string) bool {
return path.IsAbs(filepath)
}
// Mkdir alias of os.MkdirAll()
func Mkdir(dirPath string, perm os.FileMode) error {
return os.MkdirAll(dirPath, perm)
}
// OpenFile like os.OpenFile, but will auto create dir.
func OpenFile(filepath string, flag int, mode int) (*os.File, error) {
fileDir := path.Dir(filepath)
// if err := os.Mkdir(dir, 0777); err != nil {
if err := os.MkdirAll(fileDir, 0777); err != nil {
return nil, err
}
file, err := os.OpenFile(filepath, flag, os.FileMode(mode))
if err != nil {
return nil, err
}
return file, nil
}
// CreateFile if not exists
// Usage:
// CreateFile("path/to/file.txt", 0664, 0666)
func CreateFile(fpath string, filePerm, dirPerm os.FileMode) (*os.File, error) {
dirPath := path.Dir(fpath)
if !IsDir(dirPath) {
err := os.MkdirAll(dirPath, dirPerm)
if err != nil {
return nil, err
}
}
return os.OpenFile(fpath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, filePerm)
}
// MimeType get File Mime Type name. eg "image/png"
func MimeType(path string) (mime string) {
if path == "" {
return
}
file, err := os.Open(path)
if err != nil {
return
}
return ReaderMimeType(file)
}
// ReaderMimeType get the io.Reader mimeType
// Usage:
// file, err := os.Open(filepath)
// if err != nil {
// return
// }
// mime := ReaderMimeType(file)
func ReaderMimeType(r io.Reader) (mime string) {
var buf [MimeSniffLen]byte
n, _ := io.ReadFull(r, buf[:])
if n == 0 {
return ""
}
return http.DetectContentType(buf[:n])
}
// IsImageFile check file is image file.
func IsImageFile(path string) bool {
mime := MimeType(path)
if mime == "" {
return false
}
for _, imgMime := range imageMimeTypes {
if imgMime == mime {
return true
}
}
return false
}
// IsZipFile check is zip file.
// from https://blog.csdn.net/wangshubo1989/article/details/71743374
func IsZipFile(filepath string) bool {
f, err := os.Open(filepath)
if err != nil {
return false
}
defer f.Close()
buf := make([]byte, 4)
if n, err := f.Read(buf); err != nil || n < 4 {
return false
}
return bytes.Equal(buf, []byte("PK\x03\x04"))
}
// Unzip a zip archive
// from https://blog.csdn.net/wangshubo1989/article/details/71743374
func Unzip(archive, targetDir string) (err error) {
reader, err := zip.OpenReader(archive)
if err != nil {
return
}
if err = os.MkdirAll(targetDir, 0755); err != nil {
return
}
for _, file := range reader.File {
fullPath := filepath.Join(targetDir, file.Name)
if file.FileInfo().IsDir() {
err = os.MkdirAll(fullPath, file.Mode())
if err != nil {
return err
}
continue
}
fileReader, err := file.Open()
if err != nil {
return err
}
targetFile, err := os.OpenFile(fullPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, file.Mode())
if err != nil {
fileReader.Close()
return err
}
_, err = io.Copy(targetFile, fileReader)
// close all
fileReader.Close()
targetFile.Close()
if err != nil {
return err
}
}
return
}
// DeleteIfFileExist operate
func DeleteIfFileExist(fpath string) error {
if !IsFile(fpath) {
return nil
}
return os.Remove(fpath)
}