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Amazon Web Services SDK for Android
/*
* Copyright 2013-2014 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.s3.internal;
import java.io.IOException;
import java.io.InputStream;
import com.amazonaws.AmazonClientException;
import com.amazonaws.Request;
import com.amazonaws.auth.AWS4Signer;
import com.amazonaws.auth.AwsChunkedEncodingInputStream;
import com.amazonaws.services.s3.Headers;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.UploadPartRequest;
import com.amazonaws.util.BinaryUtils;
/**
* AWS4 signer implementation for AWS S3
*/
public class AWSS3V4Signer extends AWS4Signer {
private static final String CONTENT_SHA_256 = "STREAMING-AWS4-HMAC-SHA256-PAYLOAD";
/**
* Don't double-url-encode path elements; S3 expects path elements to be
* encoded only once in the canonical URI.
*/
public AWSS3V4Signer() {
super(false);
}
/**
* If necessary, creates a chunk-encoding wrapper on the request payload.
*/
@Override
protected void processRequestPayload(Request request,
HeaderSigningResult headerSigningResult) {
if (useChunkEncoding(request)) {
InputStream payloadStream = request.getContent();
String dateTime = headerSigningResult.getDateTime();
String keyPath = headerSigningResult.getScope();
byte[] kSigning = headerSigningResult.getKSigning();
String signature = BinaryUtils.toHex(headerSigningResult
.getSignature());
AwsChunkedEncodingInputStream chunkEncodededStream = new AwsChunkedEncodingInputStream(
payloadStream, kSigning, dateTime, keyPath, signature, this);
request.setContent(chunkEncodededStream);
}
}
@Override
protected String calculateContentHashPresign(Request request){
return "UNSIGNED-PAYLOAD";
}
/**
* Returns the pre-defined header value and set other necessary headers if
* the request needs to be chunk-encoded. Otherwise calls the superclass
* method which calculates the hash of the whole content for signing.
*/
@Override
protected String calculateContentHash(Request request) {
// To be consistent with other service clients using sig-v4,
// we just set the header as "required", and AWS4Signer.sign() will be
// notified to pick up the header value returned by this method.
request.addHeader("x-amz-content-sha256", "required");
if (useChunkEncoding(request)) {
final String contentLength =
request.getHeaders().get(Headers.CONTENT_LENGTH);
final long originalContentLength;
if (contentLength != null) {
originalContentLength = Long.parseLong(contentLength);
} else {
/**
* "Content-Length" header could be missing if the caller is
* uploading a stream without setting Content-Length in
* ObjectMetadata. Before using sigv4, we rely on HttpClient to
* add this header by using BufferedHttpEntity when creating the
* HttpRequest object. But now, we need this information
* immediately for the signing process, so we have to cache the
* stream here.
*/
try {
originalContentLength = getContentLength(request);
} catch (IOException e) {
throw new AmazonClientException(
"Cannot get the content-lenght of the request content.",
e);
}
}
request.addHeader("x-amz-decoded-content-length",
Long.toString(originalContentLength));
// Make sure "Content-Length" header is not empty so that HttpClient
// won't cache the stream again to recover Content-Length
request.addHeader(
Headers.CONTENT_LENGTH,
Long.toString(AwsChunkedEncodingInputStream
.calculateStreamContentLength(originalContentLength)));
return CONTENT_SHA_256;
}
return super.calculateContentHash(request);
}
/**
* Determine whether to use aws-chunked for signing
*/
private static boolean useChunkEncoding(Request request) {
// Whether to use chunked encoding for signing the request
boolean chunkedEncodingEnabled = false;
if (request.getOriginalRequest() instanceof PutObjectRequest
|| request.getOriginalRequest() instanceof UploadPartRequest) {
chunkedEncodingEnabled = true;
}
return chunkedEncodingEnabled;
}
/**
* Read the content of the request to get the length of the stream. This
* method will wrap the stream by RepeatableInputStream if it is not
* mark-supported.
*/
private static long getContentLength(Request request) throws IOException {
InputStream content = request.getContent();
if (!content.markSupported()) {
int streamBufferSize = Constants.getStreamBufferSize();
content = new RepeatableInputStream(content, streamBufferSize);
request.setContent(content);
}
long contentLength = 0;
byte[] tmp = new byte[4096];
int read;
try {
content.mark(-1);
while ((read = content.read(tmp)) != -1) {
contentLength += read;
}
content.reset();
} finally {
content.close();
}
return contentLength;
}
}