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The AWS Java SDK for Amazon S3 module holds the client classes that are used for communicating with Amazon Simple Storage Service

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/*
 * Copyright 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 software.amazon.awssdk.services.s3.internal.handlers;

import static software.amazon.awssdk.utils.FunctionalUtils.invokeSafely;

import java.io.InputStream;
import java.nio.ByteBuffer;
import java.util.Optional;
import java.util.function.Predicate;
import org.reactivestreams.Publisher;
import software.amazon.awssdk.annotations.SdkInternalApi;
import software.amazon.awssdk.core.interceptor.Context;
import software.amazon.awssdk.core.interceptor.ExecutionAttributes;
import software.amazon.awssdk.core.interceptor.ExecutionInterceptor;
import software.amazon.awssdk.core.internal.async.SdkPublishers;
import software.amazon.awssdk.http.AbortableInputStream;
import software.amazon.awssdk.services.s3.model.GetBucketPolicyRequest;
import software.amazon.awssdk.utils.IoUtils;
import software.amazon.awssdk.utils.StringInputStream;

/**
 * GetBucketPolicy returns just JSON so we wrap in XML so that it is unmarshalled correctly.
 */
@SdkInternalApi
public final class GetBucketPolicyInterceptor implements ExecutionInterceptor {
    private static final String XML_ENVELOPE_PREFIX = "";

    private static final Predicate INTERCEPTOR_CONTEXT_PREDICATE =
        context -> context.request() instanceof GetBucketPolicyRequest && context.httpResponse().isSuccessful();

    @Override
    public Optional modifyHttpResponseContent(Context.ModifyHttpResponse context,
                                                           ExecutionAttributes executionAttributes) {
        if (INTERCEPTOR_CONTEXT_PREDICATE.test(context)) {

            String policy = context.responseBody()
                                   .map(r -> invokeSafely(() -> IoUtils.toUtf8String(r)))
                                   .orElse(null);

            if (policy != null) {
                String xml = XML_ENVELOPE_PREFIX + policy + XML_ENVELOPE_SUFFIX;
                return Optional.of(AbortableInputStream.create(new StringInputStream(xml)));
            }
        }

        return context.responseBody();
    }

    @Override
    public Optional> modifyAsyncHttpResponseContent(Context.ModifyHttpResponse context,
                                                                          ExecutionAttributes executionAttributes) {
        if (INTERCEPTOR_CONTEXT_PREDICATE.test(context)) {
            return context.responsePublisher().map(
                body -> SdkPublishers.envelopeWrappedPublisher(body, XML_ENVELOPE_PREFIX, XML_ENVELOPE_SUFFIX));
        }

        return context.responsePublisher();
    }
}