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The AWS SDK for Java with support for OSGi. The AWS 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 2010-2016 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.services.s3.internal.auth;

import com.amazonaws.AmazonWebServiceClient;
import com.amazonaws.auth.RegionAwareSigner;
import com.amazonaws.auth.Signer;
import com.amazonaws.internal.auth.SignerProviderContext;
import com.amazonaws.internal.auth.SignerProvider;
import com.amazonaws.services.s3.internal.ServiceUtils;
import com.amazonaws.util.AwsHostNameUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.net.URI;

public class S3SignerProvider extends SignerProvider {

    private static Log log = LogFactory.getLog(S3SignerProvider.class);

    private final AmazonWebServiceClient awsClient;
    private Signer signer;

    public S3SignerProvider(final AmazonWebServiceClient awsClient,
                            final Signer defaultSigner) {
        this.awsClient = awsClient;
        this.signer = defaultSigner;
    }

    @Override
    public Signer getSigner(SignerProviderContext signerProviderContext) {
        URI uri = signerProviderContext.getUri();

        // Return the default signer if no URI is passed, the client is configured with region override,
        // or if we are hitting an accelerate endpoint.
        if (uri == null || ServiceUtils.isS3AccelerateEndpoint(uri.getHost()) || isSignerRegionOverrideSet()) {
            return signer;
        }

        if (signer instanceof RegionAwareSigner) {
            // Parse region name from the host component of the URL and
            // assign it to the signer
            RegionAwareSigner regionSigner = (RegionAwareSigner) signer;

            try {
                regionSigner.setRegionName(AwsHostNameUtils.parseRegionName(
                        uri.getHost(), "s3"));

            } catch (RuntimeException e) {
                log.warn("Failed to parse the endpoint " + uri +
                        ", and skip re-assigning the signer region", e);
            }
        }

        return signer;
    }

    private boolean isSignerRegionOverrideSet() {
        return awsClient != null && awsClient.getSignerRegionOverride() != null;
    }

    /**
     * This is necessary for S3 since we update the signer during request processing dependent on
     * which region the bucket exists in.
     */
    public void setSigner(Signer signer) {
        this.signer = signer;
    }

}