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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include <zencore/uid.h>
#include <zenhttp/httpcommon.h>
#include <EASTL/fixed_vector.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() ? GetHeaderSubString(m_UrlRange) : m_NormalizedUrl; }
std::string_view QueryString() const { return GetHeaderSubString(m_QueryStringRange); }
IoBuffer Body() { return m_BodyBuffer; }
inline HttpContentType ContentType() { return ParseContentType(GetHeaderValue(m_ContentTypeHeaderIndex)); }
inline HttpContentType AcceptType() { return ParseContentType(GetHeaderValue(m_AcceptHeaderIndex)); }
Oid SessionId() const { return m_SessionId; }
int RequestId() const { return m_RequestId; }
std::string_view RangeHeader() const { return GetHeaderValue(m_RangeHeaderIndex); }
std::string_view AuthorizationHeader() const { return GetHeaderValue(m_AuthorizationHeaderIndex); }
std::string_view UpgradeHeader() const { return GetHeaderValue(m_UpgradeHeaderIndex); }
std::string_view SecWebSocketKey() const { return GetHeaderValue(m_SecWebSocketKeyHeaderIndex); }
bool IsWebSocketUpgrade() const;
private:
struct HeaderRange
{
uint32_t Offset = 0;
uint32_t Length = 0;
};
struct HeaderEntry
{
HeaderRange NameRange;
HeaderRange ValueRange;
};
inline std::string_view GetHeaderValue(int8_t HeaderIndex) const
{
if (HeaderIndex == -1)
{
return {};
}
ZEN_ASSERT(size_t(HeaderIndex) < m_HeaderEntries.size());
return GetHeaderSubString(m_HeaderEntries[HeaderIndex].ValueRange);
}
std::string_view GetHeaderSubString(const HeaderRange& Range) const
{
ZEN_ASSERT_SLOW(Range.Offset + Range.Length <= m_HeaderData.size());
return std::string_view(m_HeaderData.begin(), m_HeaderData.size()).substr(Range.Offset, Range.Length);
}
HttpRequestParserCallbacks& m_Connection;
HeaderRange m_UrlRange;
HeaderRange m_QueryStringRange;
eastl::fixed_vector<HeaderEntry, 16> m_HeaderEntries;
int8_t m_ContentLengthHeaderIndex;
int8_t m_AcceptHeaderIndex;
int8_t m_ContentTypeHeaderIndex;
int8_t m_RangeHeaderIndex;
int8_t m_AuthorizationHeaderIndex;
int8_t m_UpgradeHeaderIndex;
int8_t m_SecWebSocketKeyHeaderIndex;
int8_t m_SecWebSocketVersionHeaderIndex;
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;
eastl::fixed_vector<char, 512> m_HeaderData;
std::string m_NormalizedUrl;
void ParseCurrentHeader();
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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