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// HTTPResponseParser.cpp
// Implements the cHTTPResponseParser class representing the parser for incoming HTTP responses
#include "Globals.h"
#include "HTTPResponseParser.h"
cHTTPResponseParser::cHTTPResponseParser(cHTTPResponseParser::cCallbacks & a_Callbacks):
Super(mkResponse),
m_Callbacks(a_Callbacks),
m_HasHadError(false),
m_IsInHeaders(true),
m_IsFinished(false),
m_EnvelopeParser(*this)
{
}
size_t cHTTPResponseParser::Parse(const char * a_Data, size_t a_Size)
{
// If parsing already finished or errorred, let the caller keep all the data:
if (m_IsFinished || m_HasHadError)
{
return 0;
}
// If still waiting for the status line, add to buffer and try parsing it:
auto inBufferSoFar = m_Buffer.size();
if (m_StatusLine.empty())
{
m_Buffer.append(a_Data, a_Size);
if (!ParseStatusLine())
{
// All data used, but not a complete status line yet.
return a_Size;
}
if (m_HasHadError)
{
return AString::npos;
}
// Status line completed, feed the rest of the buffer into the envelope parser:
auto bytesConsumed = m_EnvelopeParser.Parse(m_Buffer.data(), m_Buffer.size());
if (bytesConsumed == AString::npos)
{
m_HasHadError = true;
m_Callbacks.OnError("Failed to parse the envelope");
return AString::npos;
}
ASSERT(bytesConsumed < inBufferSoFar + a_Size);
m_Buffer.erase(0, bytesConsumed);
if (!m_Buffer.empty())
{
// Headers finished and there's still data left in the buffer, process it as message body:
HeadersFinished();
auto res = ParseBody(m_Buffer.data(), m_Buffer.size());
if (res == AString::npos)
{
return AString::npos;
}
return res + bytesConsumed - inBufferSoFar;
}
return a_Size;
} // if (m_StatusLine.empty())
// If still parsing headers, send them to the envelope parser:
if (m_IsInHeaders)
{
auto bytesConsumed = m_EnvelopeParser.Parse(a_Data, a_Size);
if (bytesConsumed == AString::npos)
{
m_HasHadError = true;
m_Callbacks.OnError("Failed to parse the envelope");
return AString::npos;
}
if (bytesConsumed < a_Size)
{
// Headers finished and there's still data left in the buffer, process it as message body:
HeadersFinished();
return bytesConsumed + ParseBody(a_Data + bytesConsumed, a_Size - bytesConsumed);
}
return a_Size;
}
// Already parsing the body
return ParseBody(a_Data, a_Size);
}
bool cHTTPResponseParser::ParseStatusLine(void)
{
auto idxLineEnd = m_Buffer.find("\r\n");
if (idxLineEnd == AString::npos)
{
// Not a complete line yet
return false;
}
m_StatusLine = m_Buffer.substr(0, idxLineEnd);
m_Buffer.erase(0, idxLineEnd + 2);
m_Callbacks.OnStatusLine(m_StatusLine);
return true;
}
size_t cHTTPResponseParser::ParseBody(const char * a_Data, size_t a_Size)
{
if (m_TransferEncodingParser == nullptr)
{
// We have no Transfer-encoding parser assigned. This should have happened when finishing the envelope
return AString::npos;
}
// Parse the body using the transfer encoding parser:
// (Note that TE parser returns the number of bytes left, while we return the number of bytes consumed)
return a_Size - m_TransferEncodingParser->Parse(a_Data, a_Size);
}
void cHTTPResponseParser::HeadersFinished(void)
{
m_IsInHeaders = false;
m_Callbacks.OnHeadersFinished();
auto transferEncoding = m_Headers.find("transfer-encoding");
if (transferEncoding == m_Headers.end())
{
m_TransferEncodingParser = cTransferEncodingParser::Create(*this, "identity", m_ContentLength);
}
else
{
m_TransferEncodingParser = cTransferEncodingParser::Create(*this, transferEncoding->second, m_ContentLength);
}
}
void cHTTPResponseParser::OnHeaderLine(const AString & a_Key, const AString & a_Value)
{
AddHeader(a_Key, a_Value);
m_Callbacks.OnHeaderLine(a_Key, a_Value);
}
void cHTTPResponseParser::OnError(const AString & a_ErrorDescription)
{
m_HasHadError = true;
m_Callbacks.OnError(a_ErrorDescription);
}
void cHTTPResponseParser::OnBodyData(const void * a_Data, size_t a_Size)
{
m_Callbacks.OnBodyData(a_Data, a_Size);
}
void cHTTPResponseParser::OnBodyFinished(void)
{
m_IsFinished = true;
m_Callbacks.OnBodyFinished();
}
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