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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/core/utils/event/EventHeader.h>
#include <aws/core/utils/event/EventMessage.h>
#include <aws/core/utils/event/EventStreamEncoder.h>
#include <aws/core/utils/logging/LogMacros.h>
#include <aws/core/auth/AWSAuthSigner.h>
#include <aws/common/byte_order.h>
#include <aws/core/utils/memory/AWSMemory.h>
#include <cassert>
namespace Aws
{
namespace Utils
{
namespace Event
{
static const char TAG[] = "EventStreamEncoder";
static void EncodeHeaders(const Aws::Utils::Event::Message& msg, aws_array_list* headers)
{
aws_array_list_init_dynamic(headers, get_aws_allocator(), msg.GetEventHeaders().size(), sizeof(aws_event_stream_header_value_pair));
for (auto&& header : msg.GetEventHeaders())
{
const uint8_t headerKeyLen = static_cast<uint8_t>(header.first.length());
switch(header.second.GetType())
{
case EventHeaderValue::EventHeaderType::BOOL_TRUE:
case EventHeaderValue::EventHeaderType::BOOL_FALSE:
aws_event_stream_add_bool_header(headers, header.first.c_str(), headerKeyLen, header.second.GetEventHeaderValueAsBoolean());
break;
case EventHeaderValue::EventHeaderType::BYTE:
aws_event_stream_add_bool_header(headers, header.first.c_str(), headerKeyLen, header.second.GetEventHeaderValueAsByte());
break;
case EventHeaderValue::EventHeaderType::INT16:
aws_event_stream_add_int16_header(headers, header.first.c_str(), headerKeyLen, header.second.GetEventHeaderValueAsInt16());
break;
case EventHeaderValue::EventHeaderType::INT32:
aws_event_stream_add_int32_header(headers, header.first.c_str(), headerKeyLen, header.second.GetEventHeaderValueAsInt32());
break;
case EventHeaderValue::EventHeaderType::INT64:
aws_event_stream_add_int64_header(headers, header.first.c_str(), headerKeyLen, header.second.GetEventHeaderValueAsInt64());
break;
case EventHeaderValue::EventHeaderType::BYTE_BUF:
{
const auto& bytes = header.second.GetEventHeaderValueAsBytebuf();
aws_event_stream_add_bytebuf_header(headers, header.first.c_str(), headerKeyLen, bytes.GetUnderlyingData(), static_cast<uint16_t>(bytes.GetLength()), 1 /*copy*/);
}
break;
case EventHeaderValue::EventHeaderType::STRING:
{
const auto& bytes = header.second.GetUnderlyingBuffer();
aws_event_stream_add_string_header(headers, header.first.c_str(), headerKeyLen, reinterpret_cast<char*>(bytes.GetUnderlyingData()), static_cast<uint16_t>(bytes.GetLength()), 0 /*copy*/);
}
break;
case EventHeaderValue::EventHeaderType::TIMESTAMP:
aws_event_stream_add_timestamp_header(headers, header.first.c_str(), headerKeyLen, header.second.GetEventHeaderValueAsTimestamp());
break;
case EventHeaderValue::EventHeaderType::UUID:
{
ByteBuffer uuidBytes = header.second.GetEventHeaderValueAsUuid();
aws_event_stream_add_uuid_header(headers, header.first.c_str(), headerKeyLen, uuidBytes.GetUnderlyingData());
}
break;
default:
AWS_LOG_ERROR(TAG, "Encountered unknown type of header.");
break;
}
}
}
EventStreamEncoder::EventStreamEncoder(Client::AWSAuthSigner* signer) : m_signer(signer)
{
}
Aws::Vector<unsigned char> EventStreamEncoder::EncodeAndSign(const Aws::Utils::Event::Message& msg)
{
Aws::Vector<unsigned char> outputBits;
aws_event_stream_message encoded;
if (InitEncodedStruct(msg, &encoded))
{
aws_event_stream_message signedMessage;
if (InitSignedStruct(&encoded, &signedMessage))
{
// success!
const auto signedMessageBuffer = aws_event_stream_message_buffer(&signedMessage);
const auto signedMessageLength = aws_event_stream_message_total_length(&signedMessage);
outputBits.reserve(signedMessageLength);
outputBits.insert(outputBits.end(), signedMessageBuffer, signedMessageBuffer + signedMessageLength);
aws_event_stream_message_clean_up(&signedMessage);
}
aws_event_stream_message_clean_up(&encoded);
}
return outputBits;
}
bool EventStreamEncoder::InitEncodedStruct(const Aws::Utils::Event::Message& msg, aws_event_stream_message* encoded)
{
bool success = false;
aws_array_list headers;
EncodeHeaders(msg, &headers);
aws_byte_buf payload = aws_byte_buf_from_array(msg.GetEventPayload().data(), msg.GetEventPayload().size());
if(aws_event_stream_message_init(encoded, get_aws_allocator(), &headers, &payload) == AWS_OP_SUCCESS)
{
success = true;
}
else
{
AWS_LOGSTREAM_ERROR(TAG, "Error creating event-stream message from payload.");
}
aws_event_stream_headers_list_cleanup(&headers);
return success;
}
bool EventStreamEncoder::InitSignedStruct(const aws_event_stream_message* msg, aws_event_stream_message* signedmsg)
{
bool success = false;
const auto msgbuf = aws_event_stream_message_buffer(msg);
const auto msglen = aws_event_stream_message_total_length(msg);
Event::Message signedMessage;
signedMessage.WriteEventPayload(msgbuf, msglen);
assert(m_signer);
if (m_signer->SignEventMessage(signedMessage, m_signatureSeed))
{
aws_array_list headers;
EncodeHeaders(signedMessage, &headers);
aws_byte_buf payload = aws_byte_buf_from_array(signedMessage.GetEventPayload().data(), signedMessage.GetEventPayload().size());
if(aws_event_stream_message_init(signedmsg, get_aws_allocator(), &headers, &payload) == AWS_OP_SUCCESS)
{
success = true;
}
else
{
AWS_LOGSTREAM_ERROR(TAG, "Error creating event-stream message from payload.");
}
aws_event_stream_headers_list_cleanup(&headers);
}
else
{
AWS_LOGSTREAM_ERROR(TAG, "Failed to sign event message frame.");
}
return success;
}
} // namespace Event
} // namespace Utils
} // namespace Aws
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