Example usage for com.amazonaws SignableRequest getHeaders

Introduction

In this page you can find the example usage for com.amazonaws SignableRequest getHeaders.

Prototype

Map<String, String> getHeaders();

Source Link

Document

Returns a map of all the headers included in this request.

Usage

From source file:com.ibm.og.s3.v4.AWSS3V4Signer.java

License:Open Source License

/**
 * 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.//  ww w  .  j  av a  2s. c  o  m
 */
@Override
protected String calculateContentHash(final SignableRequest<?> 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");
    final String contentLength = request.getHeaders().get(Headers.CONTENT_LENGTH);
    if (useChunkEncoding(request)) {
        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 (final IOException e) {
                throw new AmazonClientException("Cannot get the content-length 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;
    }

    if (this.digestCache != null) {
        try {
            final long length = contentLength != null ? Long.parseLong(contentLength) : 0;
            return BinaryUtils.toHex(this.digestCache.get(length));
        } catch (final ExecutionException e) {
            throw new RuntimeException(e);
        }
    }
    return super.calculateContentHash(request);
}

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