160 lines
2.8 KiB
Go
160 lines
2.8 KiB
Go
package file
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import (
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"errors"
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"fmt"
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"io"
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"mime/multipart"
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"os"
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"path"
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"time"
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"github.com/h2non/filetype"
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gonanoid "github.com/matoous/go-nanoid/v2"
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)
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const (
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MaxImageSize = 10 << 20 // 10 MB
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MaxFileSize = 50 << 20 // 50 MB
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)
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var ErrUnsupported = errors.New("文件格式不支持")
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type FileType int
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const (
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ALL FileType = 0
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IMG FileType = 1
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)
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func UploadFilename(filepath string, t FileType) (string, error) {
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fileOpen, err := os.Open(filepath)
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if err != nil {
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return "", err
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}
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defer fileOpen.Close()
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fileBytes, err := io.ReadAll(fileOpen)
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if err != nil {
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return "", errors.New("failed to read file")
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}
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if t == IMG {
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// 判断是不是图片
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if !filetype.IsImage(fileBytes) {
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return "", ErrUnsupported
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}
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}
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kind, err := filetype.Match(fileBytes)
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if err != nil {
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return "", err
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}
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if kind == filetype.Unknown {
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return "", ErrUnsupported
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}
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// 使用 filetype 判断类型后已经去读了一些bytes了
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// 要恢复文件读取位置
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_, err = fileOpen.Seek(0, io.SeekStart)
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if err != nil {
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return "", err
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}
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dir := GetPath()
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exist, _ := Exists(dir)
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if !exist {
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if err := Mkdir(dir); err != nil {
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return "", err
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}
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}
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filename := GenFilename(kind.Extension)
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path := path.Join(dir, filename)
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f, err := os.Create(path)
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if err != nil {
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return "", err
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}
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defer f.Close()
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_, err = io.Copy(f, fileOpen)
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if err != nil {
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return "", err
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}
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return "/" + path, nil
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}
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func UploadFile(file *multipart.FileHeader, t FileType) (string, error) {
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if file.Size > MaxFileSize {
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return "", errors.New("failed to receive file too large")
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}
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fileOpen, err := file.Open()
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if err != nil {
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return "", errors.New("fialed to open file")
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}
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defer fileOpen.Close()
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fileBytes, err := io.ReadAll(fileOpen)
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if err != nil {
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return "", errors.New("failed to read file")
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}
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if t == IMG {
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// 判断是不是图片
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if !filetype.IsImage(fileBytes) {
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return "", ErrUnsupported
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}
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}
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kind, err := filetype.Match(fileBytes)
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if err != nil {
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return "", err
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}
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if kind == filetype.Unknown {
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return "", ErrUnsupported
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}
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// 使用 filetype 判断类型后已经去读了一些bytes了
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// 要恢复文件读取位置
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_, err = fileOpen.Seek(0, io.SeekStart)
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if err != nil {
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return "", err
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}
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dir := GetPath()
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exist, _ := Exists(dir)
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if !exist {
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if err := Mkdir(dir); err != nil {
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return "", err
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}
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}
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filename := GenFilename(kind.Extension)
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path := path.Join(dir, filename)
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f, err := os.Create(path)
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if err != nil {
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return "", err
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}
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defer f.Close()
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_, err = io.Copy(f, fileOpen)
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if err != nil {
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return "", err
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}
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return "/" + path, nil
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}
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func GetPath() string {
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return fmt.Sprintf("public/%s/%s/%s/", time.Now().Format("2006"), time.Now().Format("01"), time.Now().Format("02"))
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}
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func GenFilename(ext string) string {
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id, _ := gonanoid.New()
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return fmt.Sprintf("%s.%s", id, ext)
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}
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