add a dedicated struct to store encrypted credentials

also gcs credentials are now encrypted, both on disk and inside the
provider.

Data provider is automatically migrated and load data will accept
old format too but you should upgrade to the new format to avoid future
issues

dataprovider/sqlite.go

@@ -232,28 +232,46 @@ func (p SQLiteProvider) migrateDatabase() error {
 	}
 	switch dbVersion.Version {
 	case 1:
-		err = updateSQLiteDatabaseFrom1To2(p.dbHandle)
-		if err != nil {
-			return err
-		}
-		err = updateSQLiteDatabaseFrom2To3(p.dbHandle)
-		if err != nil {
-			return err
-		}
-		return updateSQLiteDatabaseFrom3To4(p.dbHandle)
+		return updateSQLiteDatabaseFromV1(p.dbHandle)
 	case 2:
-		err = updateSQLiteDatabaseFrom2To3(p.dbHandle)
-		if err != nil {
-			return err
-		}
-		return updateSQLiteDatabaseFrom3To4(p.dbHandle)
+		return updateSQLiteDatabaseFromV2(p.dbHandle)
 	case 3:
-		return updateSQLiteDatabaseFrom3To4(p.dbHandle)
+		return updateSQLiteDatabaseFromV3(p.dbHandle)
+	case 4:
+		return updateSQLiteDatabaseFromV4(p.dbHandle)
 	default:
 		return fmt.Errorf("Database version not handled: %v", dbVersion.Version)
 	}
 }
 
+func updateSQLiteDatabaseFromV1(dbHandle *sql.DB) error {
+	err := updateSQLiteDatabaseFrom1To2(dbHandle)
+	if err != nil {
+		return err
+	}
+	return updateSQLiteDatabaseFromV2(dbHandle)
+}
+
+func updateSQLiteDatabaseFromV2(dbHandle *sql.DB) error {
+	err := updateSQLiteDatabaseFrom2To3(dbHandle)
+	if err != nil {
+		return err
+	}
+	return updateSQLiteDatabaseFromV3(dbHandle)
+}
+
+func updateSQLiteDatabaseFromV3(dbHandle *sql.DB) error {
+	err := updateSQLiteDatabaseFrom3To4(dbHandle)
+	if err != nil {
+		return err
+	}
+	return updateSQLiteDatabaseFromV4(dbHandle)
+}
+
+func updateSQLiteDatabaseFromV4(dbHandle *sql.DB) error {
+	return updateSQLiteDatabaseFrom4To5(dbHandle)
+}
+
 func updateSQLiteDatabaseFrom1To2(dbHandle *sql.DB) error {
 	logger.InfoToConsole("updating database version: 1 -> 2")
 	providerLog(logger.LevelInfo, "updating database version: 1 -> 2")
@@ -271,3 +289,7 @@ func updateSQLiteDatabaseFrom2To3(dbHandle *sql.DB) error {
 func updateSQLiteDatabaseFrom3To4(dbHandle *sql.DB) error {
 	return sqlCommonUpdateDatabaseFrom3To4(sqliteV4SQL, dbHandle)
 }
+
+func updateSQLiteDatabaseFrom4To5(dbHandle *sql.DB) error {
+	return sqlCommonUpdateDatabaseFrom4To5(dbHandle)
+}