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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2010-2014 Amazon.com, Inc. or its affiliates. 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.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.amazonaws.auth;

import com.amazonaws.AmazonClientException;

import java.io.File;
import java.io.IOException;

/**
 * {@link AWSCredentialsProvider} implementation that loads AWS security
 * credentials from a properties file provided on initialization.
 * 
 * The AWS access key ID is expected to be in the accessKey
 * property and the AWS secret key is expected to be in the
 * secretKey property.
 */
public class PropertiesFileCredentialsProvider implements
        AWSCredentialsProvider {

    private final String credentialsFilePath;

    /**
     * Creates a new PropertiesFileCredentialsProvider that will attempt to load
     * a custom file from the path specified to read AWS security credentials.
     * 
     * @param credentialsFilePath
     *            The custom classpath resource path to a properties file from
     *            which the AWS security credentials should be loaded.
     * 
     *            For example,
     *            

     *            /etc/somewhere/credentials.properties
     *            
     */
    public PropertiesFileCredentialsProvider(String credentialsFilePath) {
        if (credentialsFilePath == null)
            throw new IllegalArgumentException(
                    "Credentials file path cannot be null");
        this.credentialsFilePath = credentialsFilePath;
    }

    public AWSCredentials getCredentials() {
        try {
            return new PropertiesCredentials(new File(this.credentialsFilePath));
        } catch (IOException e) {
            throw new AmazonClientException(
                    "Unable to load AWS credentials from the "
                            + credentialsFilePath + " file", e);
        }
    }

    public void refresh() {
    }

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