1 files changed, 222 insertions, 0 deletions

diff --git a/src/HTTP/HTTPMessageParser.cpp b/src/HTTP/HTTPMessageParser.cpp
new file mode 100644
index 000000000..10d3d4ad9
--- /dev/null
+++ b/src/HTTP/HTTPMessageParser.cpp
@@ -0,0 +1,222 @@
+
+// HTTPMessageParser.cpp
+
+// Implements the cHTTPMessageParser class that parses HTTP messages (request or response) being pushed into the parser,
+// and reports the individual parts via callbacks
+
+#include "Globals.h"
+#include "HTTPMessageParser.h"
+
+
+
+
+
+cHTTPMessageParser::cHTTPMessageParser(cHTTPMessageParser::cCallbacks & a_Callbacks):
+	m_Callbacks(a_Callbacks),
+	m_EnvelopeParser(*this)
+{
+	Reset();
+}
+
+
+
+
+
+size_t cHTTPMessageParser::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_FirstLine.empty())
+	{
+		m_Buffer.append(a_Data, a_Size);
+		auto bytesConsumedFirstLine = ParseFirstLine();
+		ASSERT(bytesConsumedFirstLine <= inBufferSoFar + a_Size);  // Haven't consumed more data than there is in the buffer
+		ASSERT(bytesConsumedFirstLine > inBufferSoFar);  // Have consumed at least the previous buffer contents
+		if (m_FirstLine.empty())
+		{
+			// 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 bytesConsumedEnvelope = m_EnvelopeParser.Parse(m_Buffer.data(), m_Buffer.size());
+		if (bytesConsumedEnvelope == AString::npos)
+		{
+			m_HasHadError = true;
+			m_Callbacks.OnError("Failed to parse the envelope");
+			return AString::npos;
+		}
+		ASSERT(bytesConsumedEnvelope <= bytesConsumedFirstLine + a_Size);  // Haven't consumed more data than there was in the buffer
+		m_Buffer.erase(0, bytesConsumedEnvelope);
+		if (!m_EnvelopeParser.IsInHeaders())
+		{
+			HeadersFinished();
+			// Process any data still left in the buffer as message body:
+			auto bytesConsumedBody = ParseBody(m_Buffer.data(), m_Buffer.size());
+			if (bytesConsumedBody == AString::npos)
+			{
+				// Error has already been reported by ParseBody, just bail out:
+				return AString::npos;
+			}
+			return bytesConsumedBody + bytesConsumedEnvelope + bytesConsumedFirstLine - inBufferSoFar;
+		}
+		return a_Size;
+	}  // if (m_FirstLine.empty())
+
+	// If still parsing headers, send them to the envelope parser:
+	if (m_EnvelopeParser.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 (!m_EnvelopeParser.IsInHeaders())
+		{
+			HeadersFinished();
+			// Process any data still left as message body:
+			auto bytesConsumedBody = ParseBody(a_Data + bytesConsumed, a_Size - bytesConsumed);
+			if (bytesConsumedBody == AString::npos)
+			{
+				// Error has already been reported by ParseBody, just bail out:
+				return AString::npos;
+			}
+		}
+		return a_Size;
+	}
+
+	// Already parsing the body
+	return ParseBody(a_Data, a_Size);
+}
+
+
+
+
+
+void cHTTPMessageParser::Reset(void)
+{
+	m_HasHadError = false;
+	m_IsFinished = false;
+	m_FirstLine.clear();
+	m_Buffer.clear();
+	m_EnvelopeParser.Reset();
+	m_TransferEncodingParser.reset();
+	m_TransferEncoding.clear();
+	m_ContentLength = 0;
+}
+
+
+
+
+size_t cHTTPMessageParser::ParseFirstLine(void)
+{
+	auto idxLineEnd = m_Buffer.find("\r\n");
+	if (idxLineEnd == AString::npos)
+	{
+		// Not a complete line yet
+		return m_Buffer.size();
+	}
+	m_FirstLine = m_Buffer.substr(0, idxLineEnd);
+	m_Buffer.erase(0, idxLineEnd + 2);
+	m_Callbacks.OnFirstLine(m_FirstLine);
+	return idxLineEnd + 2;
+}
+
+
+
+
+size_t cHTTPMessageParser::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
+		OnError("No transfer encoding parser");
+		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 cHTTPMessageParser::HeadersFinished(void)
+{
+	m_Callbacks.OnHeadersFinished();
+	m_TransferEncodingParser = cTransferEncodingParser::Create(*this, m_TransferEncoding, m_ContentLength);
+	if (m_TransferEncodingParser == nullptr)
+	{
+		OnError(Printf("Unknown transfer encoding: %s", m_TransferEncoding.c_str()));
+		return;
+	}
+}
+
+
+
+
+
+void cHTTPMessageParser::OnHeaderLine(const AString & a_Key, const AString & a_Value)
+{
+	m_Callbacks.OnHeaderLine(a_Key, a_Value);
+	auto Key = StrToLower(a_Key);
+	if (Key == "content-length")
+	{
+		if (!StringToInteger(a_Value, m_ContentLength))
+		{
+			OnError(Printf("Invalid content length header value: \"%s\"", a_Value.c_str()));
+		}
+		return;
+	}
+	if (Key == "transfer-encoding")
+	{
+		m_TransferEncoding = a_Value;
+		return;
+	}
+}
+
+
+
+
+
+void cHTTPMessageParser::OnError(const AString & a_ErrorDescription)
+{
+	m_HasHadError = true;
+	m_Callbacks.OnError(a_ErrorDescription);
+}
+
+
+
+
+
+void cHTTPMessageParser::OnBodyData(const void * a_Data, size_t a_Size)
+{
+	m_Callbacks.OnBodyData(a_Data, a_Size);
+}
+
+
+
+
+
+void cHTTPMessageParser::OnBodyFinished(void)
+{
+	m_IsFinished = true;
+	m_Callbacks.OnBodyFinished();
+}
+
+
+
+