/// <summary>
/// Initializes a chunked upload stream with one or more trailing headers,
/// which may include a trailing checksum header
/// </summary>
/// <param name="stream">Stream to wrap</param>
/// <param name="wrappedStreamBufferSize">Size of buffer used for reading from stream</param>
/// <param name="headerSigningResult">SigV4 or SigV4a signing result for the request's headers</param>
/// <param name="trailingChecksum">Algorithm to use to calculate the stream's checksum</param>
/// <param name="trailingHeaders">Trailing headers to append after the wrapped stream</param>
public ChunkedUploadWrapperStream(Stream stream,
int wrappedStreamBufferSize,
AWSSigningResultBase headerSigningResult,
CoreChecksumAlgorithm trailingChecksum,
IDictionary <string, string> trailingHeaders)
: this(stream, wrappedStreamBufferSize, headerSigningResult)
{
if (trailingChecksum != CoreChecksumAlgorithm.NONE)
{
_trailingChecksum = trailingChecksum;
_hashAlgorithm = CryptoUtilFactory.GetChecksumInstance(trailingChecksum);
}
_trailingHeadersConsumed = false;
_trailingHeaders = trailingHeaders;
}
/// <summary>
/// Initializes a chunked upload stream
/// </summary>
/// <param name="stream">stream to wrap</param>
/// <param name="wrappedStreamBufferSize">Size of buffer used for reading from stream</param>
/// <param name="headerSigningResult">SigV4 or SigV4a signing result for the request's headers</param>
internal ChunkedUploadWrapperStream(Stream stream, int wrappedStreamBufferSize, AWSSigningResultBase headerSigningResult) : base(stream)
{
if (!(headerSigningResult is AWS4aSigningResult || headerSigningResult is AWS4SigningResult))
{
throw new AmazonClientException($"{nameof(ChunkedUploadWrapperStream)} was initialized without a SigV4 or SigV4a signing result.");
}
else if (headerSigningResult is AWS4aSigningResult)
{
Sigv4aSigner = new AWS4aSignerCRTWrapper();
}
HeaderSigningResult = headerSigningResult;
PreviousChunkSignature = headerSigningResult?.Signature;
_wrappedStreamBufferSize = wrappedStreamBufferSize;
_inputBuffer = new byte[DefaultChunkSize];
_outputBuffer = new byte[CalculateChunkHeaderLength(DefaultChunkSize, HeaderSigningResult is AWS4aSigningResult ? V4A_SIGNATURE_LENGTH : V4_SIGNATURE_LENGTH)]; // header+data
// if the wrapped stream implements encryption, switch to a read-and-copy
// strategy for filling the chunk buffer
var encryptionStream = SearchWrappedStream(s =>
{
var encryptUploadPartStream = s as EncryptUploadPartStream;
if (encryptUploadPartStream != null)
{
return(true);
}
var encryptStream = s as EncryptStream;
return(encryptStream != null);
});
if (encryptionStream != null)
{
_readStrategy = ReadStrategy.ReadAndCopy;
}
}