org.apache.hadoop.fs.s3a.SimpleAWSCredentialsProvider.java Source code

Introduction

Here is the source code for org.apache.hadoop.fs.s3a.SimpleAWSCredentialsProvider.java

Source

/**
 * 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.hadoop.fs.s3a;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.auth.BasicAWSCredentials;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.ProviderUtils;

import java.io.IOException;
import java.net.URI;

import static org.apache.hadoop.fs.s3a.Constants.ACCESS_KEY;
import static org.apache.hadoop.fs.s3a.Constants.SECRET_KEY;

/**
 * Support simple credentials for authenticating with AWS.
 * Keys generated in URLs are not supported.
 *
 * Please note that users may reference this class name from configuration
 * property fs.s3a.aws.credentials.provider.  Therefore, changing the class name
 * would be a backward-incompatible change.
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class SimpleAWSCredentialsProvider implements AWSCredentialsProvider {

    public static final String NAME = "org.apache.hadoop.fs.s3a.SimpleAWSCredentialsProvider";
    private String accessKey;
    private String secretKey;
    private IOException lookupIOE;

    public SimpleAWSCredentialsProvider(URI uri, Configuration conf) {
        try {
            Configuration c = ProviderUtils.excludeIncompatibleCredentialProviders(conf, S3AFileSystem.class);
            this.accessKey = S3AUtils.lookupPassword(c, ACCESS_KEY, null);
            this.secretKey = S3AUtils.lookupPassword(c, SECRET_KEY, null);
        } catch (IOException e) {
            lookupIOE = e;
        }
    }

    public AWSCredentials getCredentials() {
        if (lookupIOE != null) {
            // propagate any initialization problem
            throw new CredentialInitializationException(lookupIOE.toString(), lookupIOE);
        }
        if (!StringUtils.isEmpty(accessKey) && !StringUtils.isEmpty(secretKey)) {
            return new BasicAWSCredentials(accessKey, secretKey);
        }
        throw new CredentialInitializationException("Access key, secret key or session token is unset");
    }

    @Override
    public void refresh() {
    }

    @Override
    public String toString() {
        return getClass().getSimpleName();
    }

}