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/pgsql.go

@@ -209,28 +209,46 @@ func (p PGSQLProvider) migrateDatabase() error {
 	}
 	switch dbVersion.Version {
 	case 1:
-		err = updatePGSQLDatabaseFrom1To2(p.dbHandle)
-		if err != nil {
-			return err
-		}
-		err = updatePGSQLDatabaseFrom2To3(p.dbHandle)
-		if err != nil {
-			return err
-		}
-		return updatePGSQLDatabaseFrom3To4(p.dbHandle)
+		return updatePGSQLDatabaseFromV1(p.dbHandle)
 	case 2:
-		err = updatePGSQLDatabaseFrom2To3(p.dbHandle)
-		if err != nil {
-			return err
-		}
-		return updatePGSQLDatabaseFrom3To4(p.dbHandle)
+		return updatePGSQLDatabaseFromV2(p.dbHandle)
 	case 3:
-		return updatePGSQLDatabaseFrom3To4(p.dbHandle)
+		return updatePGSQLDatabaseFromV3(p.dbHandle)
+	case 4:
+		return updatePGSQLDatabaseFromV4(p.dbHandle)
 	default:
 		return fmt.Errorf("Database version not handled: %v", dbVersion.Version)
 	}
 }
 
+func updatePGSQLDatabaseFromV1(dbHandle *sql.DB) error {
+	err := updatePGSQLDatabaseFrom1To2(dbHandle)
+	if err != nil {
+		return err
+	}
+	return updatePGSQLDatabaseFromV2(dbHandle)
+}
+
+func updatePGSQLDatabaseFromV2(dbHandle *sql.DB) error {
+	err := updatePGSQLDatabaseFrom2To3(dbHandle)
+	if err != nil {
+		return err
+	}
+	return updatePGSQLDatabaseFromV3(dbHandle)
+}
+
+func updatePGSQLDatabaseFromV3(dbHandle *sql.DB) error {
+	err := updatePGSQLDatabaseFrom3To4(dbHandle)
+	if err != nil {
+		return err
+	}
+	return updatePGSQLDatabaseFromV4(dbHandle)
+}
+
+func updatePGSQLDatabaseFromV4(dbHandle *sql.DB) error {
+	return updatePGSQLDatabaseFrom4To5(dbHandle)
+}
+
 func updatePGSQLDatabaseFrom1To2(dbHandle *sql.DB) error {
 	logger.InfoToConsole("updating database version: 1 -> 2")
 	providerLog(logger.LevelInfo, "updating database version: 1 -> 2")
@@ -248,3 +266,7 @@ func updatePGSQLDatabaseFrom2To3(dbHandle *sql.DB) error {
 func updatePGSQLDatabaseFrom3To4(dbHandle *sql.DB) error {
 	return sqlCommonUpdateDatabaseFrom3To4(pgsqlV4SQL, dbHandle)
 }
+
+func updatePGSQLDatabaseFrom4To5(dbHandle *sql.DB) error {
+	return sqlCommonUpdateDatabaseFrom4To5(dbHandle)
+}