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

api/backup/backup.go

@@ -0,0 +1,84 @@
+package backup
+
+import (
+	"fmt"
+	"io/fs"
+	"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"
+)
+
+const rwxr__r__ fs.FileMode = 0744
+
+var filesToBackup = []string{"compose", "config.json", "custom_templates", "edge_jobs", "edge_stacks", "extensions", "portainer.key", "portainer.pub", "tls"}
+
+// Creates a tar.gz system archive and encrypts it if password is not empty. Returns a path to the archive file.
+func CreateBackupArchive(password string, gate *offlinegate.OfflineGate, datastore portainer.DataStore, filestorePath string) (string, error) {
+	unlock := gate.Lock()
+	defer unlock()
+
+	backupDirPath := filepath.Join(filestorePath, "backup", time.Now().Format("2006-01-02_15-04-05"))
+	if err := os.MkdirAll(backupDirPath, rwxr__r__); err != nil {
+		return "", errors.Wrap(err, "Failed to create backup dir")
+	}
+
+	if err := backupDb(backupDirPath, datastore); err != nil {
+		return "", errors.Wrap(err, "Failed to backup database")
+	}
+
+	for _, filename := range filesToBackup {
+		err := copyPath(filepath.Join(filestorePath, filename), backupDirPath)
+		if err != nil {
+			return "", errors.Wrap(err, "Failed to create backup file")
+		}
+	}
+
+	archivePath, err := archive.TarGzDir(backupDirPath)
+	if err != nil {
+		return "", errors.Wrap(err, "Failed to make an archive")
+	}
+
+	if password != "" {
+		archivePath, err = encrypt(archivePath, password)
+		if err != nil {
+			return "", errors.Wrap(err, "Failed to encrypt backup with the password")
+		}
+	}
+
+	return archivePath, nil
+}
+
+func backupDb(backupDirPath string, datastore portainer.DataStore) error {
+	backupWriter, err := os.Create(filepath.Join(backupDirPath, "portainer.db"))
+	if err != nil {
+		return err
+	}
+	if err = datastore.BackupTo(backupWriter); err != nil {
+		return err
+	}
+	return backupWriter.Close()
+}
+
+func encrypt(path string, passphrase string) (string, error) {
+	in, err := os.Open(path)
+	if err != nil {
+		return "", err
+	}
+	defer in.Close()
+
+	outFileName := fmt.Sprintf("%s.encrypted", path)
+	out, err := os.Create(outFileName)
+	if err != nil {
+		return "", err
+	}
+
+	err = crypto.AesEncrypt(in, out, []byte(passphrase))
+
+	return outFileName, err
+}