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package upload
import (
"archive/tar"
"compress/gzip"
"context"
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"time"
)
// Backup creates an archive of a project's uploads and writes it
// to the response as a download
func Backup(ctx context.Context, res http.ResponseWriter) error {
ts := time.Now().Unix()
filename := fmt.Sprintf("uploads-%d.bak.tar.gz", ts)
tmp := os.TempDir()
backup := filepath.Join(tmp, filename)
// create uploads-{stamp}.bak.tar.gz
f, err := os.Create(backup)
if err != nil {
return err
}
// loop through directory and gzip files
// add all to uploads.bak.tar.gz tarball
gz := gzip.NewWriter(f)
tarball := tar.NewWriter(gz)
errChan := make(chan error, 1)
walkFn := func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
hdr, err := tar.FileInfoHeader(info, "")
if err != nil {
return err
}
hdr.Name = path
err = tarball.WriteHeader(hdr)
if err != nil {
return err
}
if !info.IsDir() {
src, err := os.Open(path)
if err != nil {
return err
}
defer src.Close()
_, err = io.Copy(tarball, src)
if err != nil {
return err
}
err = tarball.Flush()
if err != nil {
return err
}
err = gz.Flush()
if err != nil {
return err
}
}
return nil
}
// stop processing if we get a cancellation signal
err = filepath.Walk("uploads", func(path string, info os.FileInfo, err error) error {
go func() { errChan <- walkFn(path, info, err) }()
select {
case <-ctx.Done():
if err := ctx.Err(); err != nil {
return err
}
case err := <-errChan:
if err != nil {
return err
}
}
return nil
})
if err != nil {
fmt.Println(err)
return err
}
err = gz.Close()
if err != nil {
return err
}
err = tarball.Close()
if err != nil {
return err
}
err = f.Close()
if err != nil {
return err
}
// write data to response
data, err := os.Open(backup)
if err != nil {
return err
}
defer data.Close()
defer os.Remove(backup)
disposition := `attachment; filename=%s`
info, err := data.Stat()
if err != nil {
return err
}
res.Header().Set("Content-Type", "application/octet-stream")
res.Header().Set("Content-Disposition", fmt.Sprintf(disposition, ts))
res.Header().Set("Content-Length", fmt.Sprintf("%d", info.Size()))
_, err = io.Copy(res, data)
return err
}
|
