photoprism/pkg/fs/zip.go

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package fs
import (
"archive/zip"
"io"
"os"
"strings"
)
// ZipFiles compresses one or many files into a single zip archive file.
// Param 1: filename is the output zip file's name.
// Param 2: files is a list of files to add to the zip.
func Zip(filename string, files []string) error {
newZipFile, err := os.Create(filename)
if err != nil {
return err
}
defer newZipFile.Close()
zipWriter := zip.NewWriter(newZipFile)
defer zipWriter.Close()
// Add files to zip
for _, file := range files {
if err = AddToZip(zipWriter, file); err != nil {
return err
}
}
return nil
}
func AddToZip(zipWriter *zip.Writer, filename string) error {
fileToZip, err := os.Open(filename)
if err != nil {
return err
}
defer fileToZip.Close()
// Get the file information
info, err := fileToZip.Stat()
if err != nil {
return err
}
header, err := zip.FileInfoHeader(info)
if err != nil {
return err
}
// Change to deflate to gain better compression
// see http://golang.org/pkg/archive/zip/#pkg-constants
header.Method = zip.Deflate
writer, err := zipWriter.CreateHeader(header)
if err != nil {
return err
}
_, err = io.Copy(writer, fileToZip)
return err
}
// Extract Zip file in destination directory
func Unzip(src, dest string) (fileNames []string, err error) {
r, err := zip.OpenReader(src)
if err != nil {
return fileNames, err
}
defer r.Close()
for _, f := range r.File {
// Skip directories like __OSX and potentially malicious file names containing "..".
if strings.HasPrefix(f.Name, "__") || strings.Contains(f.Name, "..") {
continue
}
fn, err := copyToFile(f, dest)
if err != nil {
return fileNames, err
}
fileNames = append(fileNames, fn)
}
return fileNames, nil
}