feat(backup): Add backup/restore to the server

api/backup/restore.go

@@ -0,0 +1,68 @@
+package backup
+
+import (
+	"context"
+	"io"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/pkg/errors"
+	portainer "github.com/portainer/portainer/api"
+	"github.com/portainer/portainer/api/archive"
+	"github.com/portainer/portainer/api/crypto"
+	"github.com/portainer/portainer/api/http/offlinegate"
+)
+
+var filesToRestore = append(filesToBackup, "portainer.db")
+
+// Restores system state from backup archive, will trigger system shutdown, when finished.
+func RestoreArchive(archive io.Reader, password string, filestorePath string, gate *offlinegate.OfflineGate, datastore portainer.DataStore, shutdownTrigger context.CancelFunc) error {
+	var err error
+	if password != "" {
+		archive, err = decrypt(archive, password)
+		if err != nil {
+			return errors.Wrap(err, "failed to decrypt the archive")
+		}
+	}
+
+	restorePath := filepath.Join(filestorePath, "restore", time.Now().Format("20060102150405"))
+	defer os.RemoveAll(filepath.Dir(restorePath))
+
+	err = extractArchive(archive, restorePath)
+	if err != nil {
+		return errors.Wrap(err, "cannot extract files from the archive. Please ensure the password is correct and try again")
+	}
+
+	unlock := gate.Lock()
+	defer unlock()
+
+	if err = datastore.Close(); err != nil {
+		return errors.Wrap(err, "Failed to stop db")
+	}
+
+	if err = restoreFiles(restorePath, filestorePath); err != nil {
+		return errors.Wrap(err, "failed to restore the system state")
+	}
+
+	shutdownTrigger()
+	return nil
+}
+
+func decrypt(r io.Reader, password string) (io.Reader, error) {
+	return crypto.AesDecrypt(r, []byte(password))
+}
+
+func extractArchive(r io.Reader, destinationDirPath string) error {
+	return archive.ExtractTarGz(r, destinationDirPath)
+}
+
+func restoreFiles(srcDir string, destinationDir string) error {
+	for _, filename := range filesToRestore {
+		err := copyPath(filepath.Join(srcDir, filename), destinationDir)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}