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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 2012-2014 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.services.glacier.internal;

import java.util.Arrays;
import java.util.List;

import com.amazonaws.Request;
import com.amazonaws.handlers.AbstractRequestHandler;
import com.amazonaws.services.glacier.model.DescribeJobRequest;
import com.amazonaws.services.glacier.model.GetJobOutputRequest;
import com.amazonaws.services.glacier.model.UploadArchiveRequest;
import com.amazonaws.services.glacier.model.UploadMultipartPartRequest;

public class GlacierRequestHandler extends AbstractRequestHandler {

	private static final List PARAMETERS = Arrays.asList(new String[] {"vaults"});

    @Override
    public void beforeRequest(Request request) {

    	// Plug in the default account ID ('-') if none has been specified

    	if (!startsWithUserId(request)) {
    		String resourcePath = request.getResourcePath();
    		request.setResourcePath(resourcePath.replaceFirst("/", "/-/"));
    	}

        request.addHeader("x-amz-glacier-version", "2012-06-01");

        //  "x-amz-content-sha256" header is required for sig v4 for some streaming operations
        request.addHeader("x-amz-content-sha256", "required");

        if (request.getOriginalRequest() instanceof UploadArchiveRequest) {
           String contentLength = request.getHeaders().remove("x-amz-content-length");
            if (contentLength != null) {
                request.getHeaders().put("Content-Length", contentLength);
            }
        } else if (request.getOriginalRequest() instanceof UploadMultipartPartRequest) {
            String range = request.getHeaders().get("Content-Range");

            if (range.startsWith("bytes=")) range = range.substring(6);
            if (range.startsWith("bytes ")) range = range.substring(6);

            if (range != null) {
                String start = range.substring(0, range.indexOf('-'));
                String end   = range.substring(range.indexOf('-') + 1);

                if (end.contains("/")) {
                    end = end.substring(0, end.indexOf("/"));
                }

                long contentLength = Long.parseLong(end) - Long.parseLong(start) + 1;
                request.getHeaders().put("Content-Length", Long.toString(contentLength));
            }
        } else if (request.getOriginalRequest() instanceof GetJobOutputRequest ||
                   request.getOriginalRequest() instanceof DescribeJobRequest) {
            String resourcePath = request.getResourcePath();
            if (resourcePath != null) {
                String newResourcePath = resourcePath.replace("{jobType}", "archive-retrievals");
                request.setResourcePath(newResourcePath);
            }
        }
    }

	private boolean startsWithUserId(Request request) {
		for (String parameter : PARAMETERS)
			if (request.getResourcePath().startsWith("/" + parameter)) {
				return false;
			}
		return true;
	}
}