Created
January 23, 2020 09:34
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Create zip archive of files
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package zip | |
import ( | |
"archive/zip" | |
"io" | |
"os" | |
) | |
// Service represents a service that knows about compressing files into zip | |
// archives. | |
type Service struct{} | |
// New returns a new zip service. | |
func New() *Service { | |
return &Service{} | |
} | |
// ZipFiles compresses one or many files into a single zip archive file. | |
func (s *Service) ZipFiles(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 := AddFileToZip(zipWriter, file); err != nil { | |
return err | |
} | |
} | |
return nil | |
} | |
// AddFileToZip takes a zip writer and a filename (path on disk) to include in | |
// the final zip file. | |
func AddFileToZip(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 | |
} | |
// Using FileInfoHeader() above only uses the basename of the file. If we want | |
// to preserve the folder structure we can overwrite this with the full path. | |
header.Name = filename | |
// 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 | |
} |
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