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archiver.go
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archiver.go
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package move
import (
"context"
"errors"
"fmt"
"io"
"os"
"path"
"strconv"
"time"
"github.com/cozy/cozy-stack/model/instance"
"github.com/cozy/cozy-stack/pkg/config/config"
"github.com/cozy/cozy-stack/pkg/crypto"
multierror "github.com/hashicorp/go-multierror"
"github.com/ncw/swift/v2"
"github.com/spf13/afero"
)
var (
archiveMaxAge = 7 * 24 * time.Hour
archiveMACConfig = crypto.MACConfig{
Name: "exports",
MaxAge: archiveMaxAge,
MaxLen: 256,
}
)
// Archiver is an interface describing an abstraction for storing archived
// data.
type Archiver interface {
OpenArchive(inst *instance.Instance, exportDoc *ExportDoc) (io.ReadCloser, error)
CreateArchive(exportDoc *ExportDoc) (io.WriteCloser, error)
RemoveArchives(exportDocs []*ExportDoc) error
}
// SystemArchiver returns the global system archiver, corresponding to the
// user's configuration.
func SystemArchiver() Archiver {
fsURL := config.FsURL()
switch fsURL.Scheme {
case config.SchemeFile, config.SchemeMem:
fs := afero.NewBasePathFs(afero.NewOsFs(), path.Join(fsURL.Path, "exports"))
return newAferoArchiver(fs)
case config.SchemeSwift, config.SchemeSwiftSecure:
return newSwiftArchiver()
default:
panic(fmt.Errorf("exports: unknown storage provider %s", fsURL.Scheme))
}
}
func newAferoArchiver(fs afero.Fs) Archiver {
return aferoArchiver{fs}
}
type aferoArchiver struct {
fs afero.Fs
}
func (a aferoArchiver) fileName(exportDoc *ExportDoc) string {
return path.Join(exportDoc.Domain, exportDoc.ID()+"tar.gz")
}
func (a aferoArchiver) OpenArchive(inst *instance.Instance, exportDoc *ExportDoc) (io.ReadCloser, error) {
return a.fs.Open(a.fileName(exportDoc))
}
func (a aferoArchiver) CreateArchive(exportDoc *ExportDoc) (io.WriteCloser, error) {
f, err := a.fs.OpenFile(a.fileName(exportDoc), os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0600)
if os.IsNotExist(err) {
if err = a.fs.MkdirAll(path.Join("/", exportDoc.Domain), 0700); err == nil {
f, err = a.fs.OpenFile(a.fileName(exportDoc), os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0600)
}
}
return f, err
}
func (a aferoArchiver) RemoveArchives(exportDocs []*ExportDoc) error {
var errm error
for _, e := range exportDocs {
if err := a.fs.Remove(a.fileName(e)); err != nil {
errm = multierror.Append(errm, err)
}
}
return errm
}
func newSwiftArchiver() Archiver {
return &switfArchiver{
c: config.GetSwiftConnection(),
container: "exports",
ctx: context.Background(),
}
}
type switfArchiver struct {
c *swift.Connection
container string
ctx context.Context
}
func (a *switfArchiver) init() error {
if _, _, err := a.c.Container(a.ctx, a.container); errors.Is(err, swift.ContainerNotFound) {
if err = a.c.ContainerCreate(a.ctx, a.container, nil); err != nil {
return err
}
}
return nil
}
func (a *switfArchiver) OpenArchive(inst *instance.Instance, exportDoc *ExportDoc) (io.ReadCloser, error) {
if err := a.init(); err != nil {
return nil, err
}
objectName := exportDoc.Domain + "/" + exportDoc.ID()
f, _, err := a.c.ObjectOpen(a.ctx, a.container, objectName, false, nil)
if err != nil {
return nil, err
}
return f, nil
}
func (a *switfArchiver) CreateArchive(exportDoc *ExportDoc) (io.WriteCloser, error) {
if err := a.init(); err != nil {
return nil, err
}
objectName := exportDoc.Domain + "/" + exportDoc.ID()
objectMeta := swift.Metadata{
"created-at": exportDoc.CreatedAt.Format(time.RFC3339),
}
headers := objectMeta.ObjectHeaders()
headers["X-Delete-At"] = strconv.FormatInt(exportDoc.ExpiresAt.Unix(), 10)
return a.c.ObjectCreate(a.ctx, a.container, objectName, true, "",
"application/tar+gzip", headers)
}
func (a *switfArchiver) RemoveArchives(exportDocs []*ExportDoc) error {
if err := a.init(); err != nil {
return err
}
var objectNames []string
for _, e := range exportDocs {
objectNames = append(objectNames, e.Domain+"/"+e.ID())
}
if len(objectNames) > 0 {
_, err := a.c.BulkDelete(a.ctx, a.container, objectNames)
return err
}
return nil
}