org.apache.druid.common.aws.FileSessionCredentialsProvider.java Source code

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Here is the source code for org.apache.druid.common.aws.FileSessionCredentialsProvider.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.druid.common.aws;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.AWSSessionCredentials;
import org.apache.druid.java.util.common.concurrent.Execs;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Properties;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class FileSessionCredentialsProvider implements AWSCredentialsProvider {
    private final ScheduledExecutorService scheduler = Execs
            .scheduledSingleThreaded("FileSessionCredentialsProviderRefresh-%d");
    private final String sessionCredentialsFile;

    /**
     * This field doesn't need to be volatile. From the Java Memory Model point of view, volatile on this field changes
     * nothing and doesn't provide any extra guarantees.
     */
    private AWSSessionCredentials awsSessionCredentials;

    public FileSessionCredentialsProvider(String sessionCredentialsFile) {
        this.sessionCredentialsFile = sessionCredentialsFile;
        refresh();

        scheduler.scheduleAtFixedRate(this::refresh, 1, 1, TimeUnit.HOURS); // refresh every hour
    }

    @Override
    public AWSCredentials getCredentials() {
        return awsSessionCredentials;
    }

    @Override
    public void refresh() {
        try {
            Properties props = new Properties();
            try (InputStream is = Files.newInputStream(Paths.get(sessionCredentialsFile))) {
                props.load(is);
            }

            String sessionToken = props.getProperty("sessionToken");
            String accessKey = props.getProperty("accessKey");
            String secretKey = props.getProperty("secretKey");

            awsSessionCredentials = new Credentials(sessionToken, accessKey, secretKey);
        } catch (IOException e) {
            throw new RuntimeException("cannot refresh AWS credentials", e);
        }
    }

    private static class Credentials implements AWSSessionCredentials {
        private final String sessionToken;
        private final String accessKey;
        private final String secretKey;

        private Credentials(String sessionToken, String accessKey, String secretKey) {
            this.sessionToken = sessionToken;
            this.accessKey = accessKey;
            this.secretKey = secretKey;
        }

        @Override
        public String getSessionToken() {
            return sessionToken;
        }

        @Override
        public String getAWSAccessKeyId() {
            return accessKey;
        }

        @Override
        public String getAWSSecretKey() {
            return secretKey;
        }
    }
}