Add CredManager.

cred/manager.go

@@ -0,0 +1,29 @@
+// Copyright 2021 The casbin Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cred
+
+type CredManager interface {
+	GetSealedPassword(password string, userSalt string, organizationSalt string) string
+}
+
+func GetCredManager(passwordType string) CredManager {
+	if passwordType == "plain" {
+		return NewPlainCredManager()
+	} else if passwordType == "salt" {
+		return NewSha256SaltCredManager()
+	}
+
+	return nil
+}