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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/uid.h>
#include <zenhttp/httpcommon.h>
ZEN_THIRD_PARTY_INCLUDES_START
#include <http_parser.h>
ZEN_THIRD_PARTY_INCLUDES_END
#include <atomic>
namespace zen {
class HttpRequestParserCallbacks
{
public:
virtual ~HttpRequestParserCallbacks() = default;
virtual void HandleRequest() = 0;
virtual void TerminateConnection() = 0;
};
struct HttpRequestParser
{
explicit HttpRequestParser(HttpRequestParserCallbacks& Connection);
~HttpRequestParser();
size_t ConsumeData(const char* InputData, size_t DataSize);
void ResetState();
HttpVerb RequestVerb() const { return m_RequestVerb; }
bool IsKeepAlive() const { return m_KeepAlive; }
std::string_view Url() const { return m_NormalizedUrl.empty() ? std::string_view(m_Url, m_UrlLength) : m_NormalizedUrl; }
std::string_view QueryString() const { return std::string_view(m_QueryString, m_QueryLength); }
IoBuffer Body() { return m_BodyBuffer; }
inline HttpContentType ContentType()
{
if (m_ContentTypeHeaderIndex < 0)
{
return HttpContentType::kUnknownContentType;
}
return ParseContentType(m_Headers[m_ContentTypeHeaderIndex].Value);
}
inline HttpContentType AcceptType()
{
if (m_AcceptHeaderIndex < 0)
{
return HttpContentType::kUnknownContentType;
}
return ParseContentType(m_Headers[m_AcceptHeaderIndex].Value);
}
Oid SessionId() const { return m_SessionId; }
int RequestId() const { return m_RequestId; }
std::string_view RangeHeader() const { return m_RangeHeaderIndex != -1 ? m_Headers[m_RangeHeaderIndex].Value : std::string_view(); }
private:
struct HeaderEntry
{
HeaderEntry() = default;
HeaderEntry(std::string_view InName, std::string_view InValue) : Name(InName), Value(InValue) {}
std::string_view Name;
std::string_view Value;
};
HttpRequestParserCallbacks& m_Connection;
char* m_HeaderCursor = m_HeaderBuffer;
char* m_Url = nullptr;
size_t m_UrlLength = 0;
char* m_QueryString = nullptr;
size_t m_QueryLength = 0;
char* m_CurrentHeaderName = nullptr; // Used while parsing headers
size_t m_CurrentHeaderNameLength = 0;
char* m_CurrentHeaderValue = nullptr; // Used while parsing headers
size_t m_CurrentHeaderValueLength = 0;
std::vector<HeaderEntry> m_Headers;
int8_t m_ContentLengthHeaderIndex;
int8_t m_AcceptHeaderIndex;
int8_t m_ContentTypeHeaderIndex;
int8_t m_RangeHeaderIndex;
HttpVerb m_RequestVerb;
std::atomic_bool m_KeepAlive{false};
bool m_Expect100Continue = false;
int m_RequestId = -1;
Oid m_SessionId{};
IoBuffer m_BodyBuffer;
uint64_t m_BodyPosition = 0;
http_parser m_Parser;
char m_HeaderBuffer[1024];
std::string m_NormalizedUrl;
void AppendCurrentHeader();
int OnMessageBegin();
int OnUrl(const char* Data, size_t Bytes);
int OnHeader(const char* Data, size_t Bytes);
int OnHeaderValue(const char* Data, size_t Bytes);
int OnHeadersComplete();
int OnBody(const char* Data, size_t Bytes);
int OnMessageComplete();
static HttpRequestParser* GetThis(http_parser* Parser) { return reinterpret_cast<HttpRequestParser*>(Parser->data); }
static http_parser_settings s_ParserSettings;
};
} // namespace zen
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