com.google.cloud.broker.apps.brokerserver.accesstokens.providers.AbstractProvider Maven / Gradle / Ivy

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Service to enable end-to-end Kerberos security and Cloud IAM integration for Hadoop workloads on Google Cloud Platform (GCP).

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// Copyright 2020 Google LLC
// 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 com.google.cloud.broker.apps.brokerserver.accesstokens.providers;

import java.util.List;

import com.google.cloud.broker.apps.brokerserver.accesstokens.AccessToken;
import com.google.cloud.broker.settings.AppSettings;
import com.google.cloud.broker.utils.InstanceUtils;


public abstract class AbstractProvider {

    private static AbstractProvider instance;

    public static AbstractProvider getInstance() {
        String className = AppSettings.getInstance().getString(AppSettings.PROVIDER_BACKEND);
        if (instance == null || !className.equals(instance.getClass().getCanonicalName())) {
            instance = (AbstractProvider) InstanceUtils.invokeConstructor(className);
        }
        return instance;
    }

    public abstract AccessToken getAccessToken(String googleIdentity, List scopes);

}