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// Copyright Epic Games, Inc. All Rights Reserved.
#include "frontend.h"
#include <zencore/compactbinarybuilder.h>
#include <zencore/endian.h>
#include <zencore/filesystem.h>
#include <zencore/fmtutils.h>
#include <zencore/logging.h>
#include <zencore/string.h>
#include <zencore/trace.h>
ZEN_THIRD_PARTY_INCLUDES_START
#if ZEN_PLATFORM_WINDOWS
# include <Windows.h>
#endif
ZEN_THIRD_PARTY_INCLUDES_END
#if !defined(ZEN_EMBED_HTML_ZIP)
# define ZEN_EMBED_HTML_ZIP ZEN_BUILD_RELEASE
#endif
#if ZEN_EMBED_HTML_ZIP
static unsigned char gHtmlZipData[] = {
# include <html.zip.h>
};
#endif
namespace zen {
////////////////////////////////////////////////////////////////////////////////
HttpFrontendService::HttpFrontendService(std::filesystem::path Directory, HttpStatusService& StatusService)
: m_Directory(Directory)
, m_StatusService(StatusService)
{
ZEN_TRACE_CPU("HttpFrontendService::HttpFrontendService");
std::filesystem::path SelfPath = GetRunningExecutablePath();
#if ZEN_EMBED_HTML_ZIP
// Load an embedded Zip archive
IoBuffer HtmlZipDataBuffer(IoBuffer::Wrap, gHtmlZipData, sizeof(gHtmlZipData) - 1);
m_ZipFs = std::make_unique<ZipFs>(std::move(HtmlZipDataBuffer));
#endif
if (m_Directory.empty() && !m_ZipFs)
{
// Probe for development layout
std::error_code ErrorCode;
std::filesystem::path Path = SelfPath;
while (Path.has_parent_path())
{
std::filesystem::path ParentPath = Path.parent_path();
if (ParentPath == Path)
{
break;
}
if (IsFile(ParentPath / "xmake.lua", ErrorCode))
{
if (ErrorCode)
{
break;
}
std::filesystem::path HtmlDir = ParentPath / "src" / "zenserver" / "frontend" / "html";
if (IsDir(HtmlDir, ErrorCode))
{
m_Directory = HtmlDir;
}
break;
}
Path = ParentPath;
}
}
if (m_ZipFs)
{
ZEN_INFO("front-end is served from embedded zip");
}
else if (!m_Directory.empty())
{
ZEN_INFO("front-end is served from '{}'", m_Directory);
}
else
{
ZEN_INFO("front-end is NOT AVAILABLE");
}
m_StatusService.RegisterHandler("dashboard", *this);
}
HttpFrontendService::~HttpFrontendService()
{
m_StatusService.UnregisterHandler("dashboard", *this);
}
const char*
HttpFrontendService::BaseUri() const
{
return "/dashboard/"; // in order to use the root path we need to remove HttpAddUrlToUrlGroup in HttpSys.cpp
}
////////////////////////////////////////////////////////////////////////////////
void
HttpFrontendService::HandleStatusRequest(zen::HttpServerRequest& Request)
{
CbObjectWriter Cbo;
Cbo << "ok" << true;
Request.WriteResponse(HttpResponseCode::OK, Cbo.Save());
}
void
HttpFrontendService::HandleRequest(zen::HttpServerRequest& Request)
{
using namespace std::literals;
ExtendableStringBuilder<256> UriBuilder;
std::string_view Uri = Request.RelativeUriWithExtension();
for (; Uri.length() > 0 && Uri[0] == '/'; Uri = Uri.substr(1))
;
if (Uri.empty())
{
Uri = "index.html"sv;
}
else if (Uri.back() == '/')
{
UriBuilder << Uri << "index.html"sv;
Uri = UriBuilder;
}
// Dismiss if the URI contains .. anywhere to prevent arbitrary file reads
if (Uri.find("..") != Uri.npos)
{
return Request.WriteResponse(HttpResponseCode::Forbidden);
}
// Map the file extension to a MIME type. To keep things constrained, only a
// small subset of file extensions is allowed
HttpContentType ContentType = HttpContentType::kUnknownContentType;
if (const size_t DotIndex = Uri.rfind("."); DotIndex != Uri.npos)
{
const std::string_view DotExt = Uri.substr(DotIndex + 1);
ContentType = ParseContentType(DotExt);
}
if (ContentType == HttpContentType::kUnknownContentType)
{
return Request.WriteResponse(HttpResponseCode::Forbidden);
}
auto WriteResponseForUri = [this,
&Request](std::string_view InUri, HttpResponseCode ResponseCode, HttpContentType ContentType) -> bool {
// The given content directory overrides any zip-fs discovered in the binary
if (!m_Directory.empty())
{
auto FullPath = m_Directory / std::filesystem::path(InUri).make_preferred();
FileContents File = ReadFile(FullPath);
if (!File.ErrorCode)
{
Request.WriteResponse(ResponseCode, ContentType, File.Data[0]);
return true;
}
}
if (m_ZipFs)
{
if (IoBuffer FileBuffer = m_ZipFs->GetFile(InUri))
{
Request.WriteResponse(HttpResponseCode::OK, ContentType, FileBuffer);
return true;
}
}
return false;
};
if (WriteResponseForUri(Uri, HttpResponseCode::OK, ContentType))
{
return;
}
else if (WriteResponseForUri("404.html"sv, HttpResponseCode::NotFound, HttpContentType::kHTML))
{
return;
}
else
{
Request.WriteResponse(HttpResponseCode::NotFound, HttpContentType::kText, "Not found"sv);
}
}
} // namespace zen
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