1 files changed, 533 insertions, 0 deletions
diff --git a/zenhttp/httpserver.cpp b/zenhttp/httpserver.cpp
new file mode 100644
index 000000000..f97ac0067
--- /dev/null
+++ b/zenhttp/httpserver.cpp
@@ -0,0 +1,533 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <zenhttp/httpserver.h>
+
+#include "httpnull.h"
+#include "httpshared.h"
+#include "httpsys.h"
+#include "httpuws.h"
+
+#include <zencore/compactbinary.h>
+#include <zencore/compactbinarypackage.h>
+#include <zencore/iobuffer.h>
+#include <zencore/logging.h>
+#include <zencore/refcount.h>
+#include <zencore/stream.h>
+#include <zencore/string.h>
+#include <zencore/thread.h>
+
+#include <conio.h>
+#include <new.h>
+#include <charconv>
+#include <span>
+#include <string_view>
+
+#include <doctest/doctest.h>
+
+namespace zen {
+
+using namespace std::literals;
+
+std::string_view
+MapContentTypeToString(HttpContentType ContentType)
+{
+	switch (ContentType)
+	{
+		default:
+		case HttpContentType::kUnknownContentType:
+		case HttpContentType::kBinary:
+			return "application/octet-stream"sv;
+
+		case HttpContentType::kText:
+			return "text/plain"sv;
+
+		case HttpContentType::kJSON:
+			return "application/json"sv;
+
+		case HttpContentType::kCbObject:
+			return "application/x-ue-cb"sv;
+
+		case HttpContentType::kCbPackage:
+			return "application/x-ue-cbpkg"sv;
+
+		case HttpContentType::kCbPackageOffer:
+			return "application/x-ue-offer"sv;
+
+		case HttpContentType::kYAML:
+			return "text/yaml"sv;
+	}
+}
+
+static const uint32_t HashBinary					= HashStringDjb2("application/octet-stream"sv);
+static const uint32_t HashJson						= HashStringDjb2("application/json"sv);
+static const uint32_t HashYaml						= HashStringDjb2("text/yaml"sv);
+static const uint32_t HashText						= HashStringDjb2("text/plain"sv);
+static const uint32_t HashCompactBinary				= HashStringDjb2("application/x-ue-cb"sv);
+static const uint32_t HashCompactBinaryPackage		= HashStringDjb2("application/x-ue-cbpkg"sv);
+static const uint32_t HashCompactBinaryPackageOffer = HashStringDjb2("application/x-ue-offer"sv);
+
+HttpContentType
+ParseContentType(const std::string_view& ContentTypeString)
+{
+	if (!ContentTypeString.empty())
+	{
+		const uint32_t CtHash = HashStringDjb2(ContentTypeString);
+
+		if (CtHash == HashBinary)
+		{
+			return HttpContentType::kBinary;
+		}
+		else if (CtHash == HashCompactBinary)
+		{
+			return HttpContentType::kCbObject;
+		}
+		else if (CtHash == HashCompactBinaryPackage)
+		{
+			return HttpContentType::kCbPackage;
+		}
+		else if (CtHash == HashCompactBinaryPackageOffer)
+		{
+			return HttpContentType::kCbPackageOffer;
+		}
+		else if (CtHash == HashJson)
+		{
+			return HttpContentType::kJSON;
+		}
+		else if (CtHash == HashYaml)
+		{
+			return HttpContentType::kYAML;
+		}
+		else if (CtHash == HashText)
+		{
+			return HttpContentType::kText;
+		}
+	}
+
+	return HttpContentType::kUnknownContentType;
+}
+
+const char*
+ReasonStringForHttpResultCode(int HttpCode)
+{
+	switch (HttpCode)
+	{
+			// 1xx Informational
+
+		case 100:
+			return "Continue";
+		case 101:
+			return "Switching Protocols";
+
+			// 2xx Success
+
+		case 200:
+			return "OK";
+		case 201:
+			return "Created";
+		case 202:
+			return "Accepted";
+		case 204:
+			return "No Content";
+		case 205:
+			return "Reset Content";
+		case 206:
+			return "Partial Content";
+
+			// 3xx Redirection
+
+		case 300:
+			return "Multiple Choices";
+		case 301:
+			return "Moved Permanently";
+		case 302:
+			return "Found";
+		case 303:
+			return "See Other";
+		case 304:
+			return "Not Modified";
+		case 305:
+			return "Use Proxy";
+		case 306:
+			return "Switch Proxy";
+		case 307:
+			return "Temporary Redirect";
+		case 308:
+			return "Permanent Redirect";
+
+			// 4xx Client errors
+
+		case 400:
+			return "Bad Request";
+		case 401:
+			return "Unauthorized";
+		case 402:
+			return "Payment Required";
+		case 403:
+			return "Forbidden";
+		case 404:
+			return "Not Found";
+		case 405:
+			return "Method Not Allowed";
+		case 406:
+			return "Not Acceptable";
+		case 407:
+			return "Proxy Authentication Required";
+		case 408:
+			return "Request Timeout";
+		case 409:
+			return "Conflict";
+		case 410:
+			return "Gone";
+		case 411:
+			return "Length Required";
+		case 412:
+			return "Precondition Failed";
+		case 413:
+			return "Payload Too Large";
+		case 414:
+			return "URI Too Long";
+		case 415:
+			return "Unsupported Media Type";
+		case 416:
+			return "Range Not Satisifiable";
+		case 417:
+			return "Expectation Failed";
+		case 418:
+			return "I'm a teapot";
+		case 421:
+			return "Misdirected Request";
+		case 422:
+			return "Unprocessable Entity";
+		case 423:
+			return "Locked";
+		case 424:
+			return "Failed Dependency";
+		case 425:
+			return "Too Early";
+		case 426:
+			return "Upgrade Required";
+		case 428:
+			return "Precondition Required";
+		case 429:
+			return "Too Many Requests";
+		case 431:
+			return "Request Header Fields Too Large";
+
+			// 5xx Server errors
+
+		case 500:
+			return "Internal Server Error";
+		case 501:
+			return "Not Implemented";
+		case 502:
+			return "Bad Gateway";
+		case 503:
+			return "Service Unavailable";
+		case 504:
+			return "Gateway Timeout";
+		case 505:
+			return "HTTP Version Not Supported";
+		case 506:
+			return "Variant Also Negotiates";
+		case 507:
+			return "Insufficient Storage";
+		case 508:
+			return "Loop Detected";
+		case 510:
+			return "Not Extended";
+		case 511:
+			return "Network Authentication Required";
+
+		default:
+			return "Unknown Result";
+	}
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+Ref<IHttpPackageHandler>
+HttpService::HandlePackageRequest(HttpServerRequest& HttpServiceRequest)
+{
+	ZEN_UNUSED(HttpServiceRequest);
+
+	return nullptr;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+HttpServerRequest::HttpServerRequest()
+{
+}
+
+HttpServerRequest::~HttpServerRequest()
+{
+}
+
+void
+HttpServerRequest::WriteResponse(HttpResponseCode ResponseCode, CbPackage Data)
+{
+	std::vector<IoBuffer> ResponseBuffers = FormatPackageMessage(Data);
+	return WriteResponse(ResponseCode, HttpContentType::kCbPackage, ResponseBuffers);
+}
+
+void
+HttpServerRequest::WriteResponse(HttpResponseCode ResponseCode, CbObject Data)
+{
+	SharedBuffer			Buf = Data.GetBuffer();
+	std::array<IoBuffer, 1> Buffers{IoBufferBuilder::MakeCloneFromMemory(Buf.GetData(), Buf.GetSize())};
+	return WriteResponse(ResponseCode, HttpContentType::kCbObject, Buffers);
+}
+
+void
+HttpServerRequest::WriteResponse(HttpResponseCode ResponseCode, HttpContentType ContentType, std::string_view ResponseString)
+{
+	return WriteResponse(ResponseCode, ContentType, std::u8string_view{(char8_t*)ResponseString.data(), ResponseString.size()});
+}
+
+void
+HttpServerRequest::WriteResponse(HttpResponseCode ResponseCode, HttpContentType ContentType, IoBuffer Blob)
+{
+	std::array<IoBuffer, 1> Buffers{Blob};
+	return WriteResponse(ResponseCode, ContentType, Buffers);
+}
+
+void
+HttpServerRequest::WriteResponse(HttpResponseCode ResponseCode, HttpContentType ContentType, CompositeBuffer& Payload)
+{
+	std::span<const SharedBuffer> Segments = Payload.GetSegments();
+
+	std::vector<IoBuffer> Buffers;
+
+	for (auto& Segment : Segments)
+	{
+		Buffers.push_back(Segment.AsIoBuffer());
+	}
+
+	WriteResponse(ResponseCode, ContentType, Payload);
+}
+
+HttpServerRequest::QueryParams
+HttpServerRequest::GetQueryParams()
+{
+	QueryParams Params;
+
+	const std::string_view QStr = QueryString();
+
+	const char* QueryIt	 = QStr.data();
+	const char* QueryEnd = QueryIt + QStr.size();
+
+	while (QueryIt != QueryEnd)
+	{
+		if (*QueryIt == '&')
+		{
+			++QueryIt;
+			continue;
+		}
+
+		const std::string_view Query{QueryIt, QueryEnd};
+
+		size_t DelimIndex = Query.find('&', 0);
+
+		if (DelimIndex == std::string_view::npos)
+		{
+			DelimIndex = Query.size();
+		}
+
+		std::string_view ThisQuery{QueryIt, DelimIndex};
+
+		size_t EqIndex = ThisQuery.find('=', 0);
+
+		if (EqIndex != std::string_view::npos)
+		{
+			std::string_view Parm{ThisQuery.data(), EqIndex};
+			ThisQuery.remove_prefix(EqIndex + 1);
+
+			Params.KvPairs.emplace_back(Parm, ThisQuery);
+		}
+
+		QueryIt += DelimIndex;
+	}
+
+	return Params;
+}
+
+Oid
+HttpServerRequest::SessionId() const
+{
+	if (m_Flags & kHaveSessionId)
+	{
+		return m_SessionId;
+	}
+
+	m_SessionId = ParseSessionId();
+	m_Flags |= kHaveSessionId;
+	return m_SessionId;
+}
+
+uint32_t
+HttpServerRequest::RequestId() const
+{
+	if (m_Flags & kHaveRequestId)
+	{
+		return m_RequestId;
+	}
+
+	m_RequestId = ParseRequestId();
+	m_Flags |= kHaveRequestId;
+	return m_RequestId;
+}
+
+CbObject
+HttpServerRequest::ReadPayloadObject()
+{
+	if (IoBuffer Payload = ReadPayload())
+	{
+		return LoadCompactBinaryObject(std::move(Payload));
+	}
+
+	return {};
+}
+
+CbPackage
+HttpServerRequest::ReadPayloadPackage()
+{
+	if (IoBuffer Payload = ReadPayload())
+	{
+		return ParsePackageMessage(std::move(Payload));
+	}
+
+	return {};
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+void
+HttpRequestRouter::AddPattern(const char* Id, const char* Regex)
+{
+	ZEN_ASSERT(m_PatternMap.find(Id) == m_PatternMap.end());
+
+	m_PatternMap.insert({Id, Regex});
+}
+
+void
+HttpRequestRouter::RegisterRoute(const char* Regex, HttpRequestRouter::HandlerFunc_t&& HandlerFunc, HttpVerb SupportedVerbs)
+{
+	ExtendableStringBuilder<128> ExpandedRegex;
+	ProcessRegexSubstitutions(Regex, ExpandedRegex);
+
+	m_Handlers.emplace_back(ExpandedRegex.c_str(), SupportedVerbs, std::move(HandlerFunc), Regex);
+}
+
+void
+HttpRequestRouter::ProcessRegexSubstitutions(const char* Regex, StringBuilderBase& OutExpandedRegex)
+{
+	size_t RegexLen = strlen(Regex);
+
+	for (size_t i = 0; i < RegexLen;)
+	{
+		bool matched = false;
+
+		if (Regex[i] == '{' && ((i == 0) || (Regex[i - 1] != '\\')))
+		{
+			// Might have a pattern reference - find closing brace
+
+			for (size_t j = i + 1; j < RegexLen; ++j)
+			{
+				if (Regex[j] == '}')
+				{
+					std::string Pattern(&Regex[i + 1], j - i - 1);
+
+					if (auto it = m_PatternMap.find(Pattern); it != m_PatternMap.end())
+					{
+						OutExpandedRegex.Append(it->second.c_str());
+					}
+					else
+					{
+						// Default to anything goes (or should this just be an error?)
+
+						OutExpandedRegex.Append("(.+?)");
+					}
+
+					// skip ahead
+					i = j + 1;
+
+					matched = true;
+
+					break;
+				}
+			}
+		}
+
+		if (!matched)
+		{
+			OutExpandedRegex.Append(Regex[i++]);
+		}
+	}
+}
+
+bool
+HttpRequestRouter::HandleRequest(zen::HttpServerRequest& Request)
+{
+	const HttpVerb Verb = Request.RequestVerb();
+
+	std::string_view  Uri = Request.RelativeUri();
+	HttpRouterRequest RouterRequest(Request);
+
+	for (const auto& Handler : m_Handlers)
+	{
+		if ((Handler.Verbs & Verb) == Verb && regex_match(begin(Uri), end(Uri), RouterRequest.m_Match, Handler.RegEx))
+		{
+			Handler.Handler(RouterRequest);
+
+			return true;  // Route matched
+		}
+	}
+
+	return false;  // No route matched
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+Ref<HttpServer>
+CreateHttpServer()
+{
+#if 0
+	return new HttpUwsServer;
+#elif ZEN_WITH_HTTPSYS
+	return new HttpSysServer{std::thread::hardware_concurrency()};
+#else
+	return new HttpNullServer;
+#endif
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+TEST_CASE("http")
+{
+	using namespace std::literals;
+
+	SUBCASE("router")
+	{
+		HttpRequestRouter r;
+		r.AddPattern("a", "[[:alpha:]]+");
+		r.RegisterRoute(
+			"{a}",
+			[&](auto) {},
+			HttpVerb::kGet);
+
+		// struct TestHttpServerRequest : public HttpServerRequest
+		//{
+		//	TestHttpServerRequest(std::string_view Uri) : m_uri{Uri} {}
+		//};
+
+		// TestHttpServerRequest req{};
+		// r.HandleRequest(req);
+	}
+}
+
+void
+http_forcelink()
+{
+}
+
+}  // namespace zen