Downloads: set the last modifier date/time of the files to the current UTC time, no need to expose the actual date/time

src/libs/utils/impl/Zipper.cpp

@@ -22,6 +22,9 @@
 #include <cstddef>
 #include <fstream>
 
+#include <Wt/WDate.h>
+#include <Wt/WTime.h>
+
 #include "utils/Path.hpp"
 
 // Done using specs from https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
@@ -56,6 +59,7 @@ namespace Zip
 			void write8(std::size_t offset, std::uint8_t value);
 			void write16(std::size_t offset, std::uint16_t value);
 			void write32(std::size_t offset, std::uint32_t value);
+			void writeDateTime(std::size_t offset, const Wt::WDateTime& time);
 
 		private:
 			std::byte*	_buffer {};
@@ -84,6 +88,24 @@ namespace Zip
 		_buffer[offset + 3] = static_cast<std::byte>(value >> 24);
 	}
 
+	void
+	ZipHeader::writeDateTime(std::size_t offset, const Wt::WDateTime& dateTime)
+	{
+		std::uint32_t encodedDateTime{};
+
+		// Date
+		encodedDateTime |= ((dateTime.date().year() - 1980) << 25);
+		encodedDateTime |= (dateTime.date().month() << 21);
+		encodedDateTime |= (dateTime.date().day() << 16);
+
+		// Time
+		encodedDateTime |= (dateTime.time().hour() << 11);
+		encodedDateTime |= (dateTime.time().minute() << 5);
+		encodedDateTime |= (dateTime.time().second() << 1);
+
+		write32(offset, encodedDateTime);
+	}
+
 	class LocalFileHeader : public ZipHeader
 	{
 		public:
@@ -94,11 +116,7 @@ namespace Zip
 			void setVersionNeededToExtract(unsigned major, unsigned minor) { assert(minor < 10); write16(4, major*10 + minor); }
 			void setGeneralPurposeFlags(std::uint16_t flags) { write16(6, flags); }
 			void setCompressionMethod(CompressionMethod compressionMethod) { write16(8, compressionMethod); }
-			void setLastModifiedDateTime()
+			void setLastModifiedDateTime(const Wt::WDateTime& dateTime) { writeDateTime(10, dateTime); }
-			{ // TODO
-				write16(10, 0); // time
-				write16(12, 0); // date
-			}
 			void setCrc32UncompressedData(std::uint32_t crc) { write32(14, crc); }
 			void setCompressedSize(std::size_t size) { write32(18, size); }
 			void setUncompressedSize(std::size_t size) { write32(22, size); }
@@ -129,11 +147,7 @@ namespace Zip
 			void setVersionNeededToExtract(unsigned major, unsigned minor) { assert(minor < 10); write16(6, major*10 + minor); }
 			void setGeneralPurposeFlags(std::uint16_t flags) { write16(8, flags); }
 			void setCompressionMethod(CompressionMethod method) { write16(10, method); }
-			void setLastModifiedDateTime()
+			void setLastModifiedDateTime(const Wt::WDateTime& dateTime) { writeDateTime(12, dateTime); }
-			{
-				write16(12, 0); // time
-				write16(14, 0); // date
-			}
 			void setCrc32UncompressedData(std::uint32_t crc32) { write32(16, crc32); }
 			void setCompressedSize(std::size_t size) { write32(20, size); }
 			void setUncompressedSize(std::size_t size) { write32(24, size); }
@@ -163,7 +177,7 @@ namespace Zip
 			static constexpr std::size_t getHeaderSize() { return 22; }
 	};
 
-	Zipper::Zipper(const std::map<std::string, std::filesystem::path>& files)
+	Zipper::Zipper(const std::map<std::string, std::filesystem::path>& files, const Wt::WDateTime& lastModifiedTime)
 	{
 		for (const auto& [filename, filePath] : files)
 		{
@@ -175,6 +189,11 @@ namespace Zip
 			if (ec)
 				throw ZipperException {"Cannot get file size for '" + filePath.string() + "': " + ec.message()};
 
+			if (lastModifiedTime.isValid())
+				fileContext.lastModifiedTime = lastModifiedTime;
+			else
+				fileContext.lastModifiedTime = getLastWriteTime(filePath);
+
 			_files[filename] = std::move(fileContext);
 
 			_totalZipSize += LocalFileHeader::getHeaderSize();
@@ -279,7 +298,7 @@ namespace Zip
 		header.setCrc32UncompressedData(ZipHeader::UnknownCrc32);
 		header.setCompressedSize(ZipHeader::UnknownFileSize);
 		header.setUncompressedSize(ZipHeader::UnknownFileSize);
-		header.setLastModifiedDateTime(); // getLastWriteTime(*_currentFile));
+		header.setLastModifiedDateTime(_currentFile->second.lastModifiedTime);
 		header.setFileNameLength(_currentFile->first.size());
 		header.setExtraFieldLength(0);
 
@@ -393,7 +412,7 @@ namespace Zip
 		header.setCompressionMethod(ZipHeader::CompressionMethod::NoCompression);
 		header.setCompressedSize(_currentFile->second.fileSize);
 		header.setUncompressedSize(_currentFile->second.fileSize);
-		header.setLastModifiedDateTime(); // getLastWriteTime(*_currentFile));
+		header.setLastModifiedDateTime(_currentFile->second.lastModifiedTime);
 		header.setCrc32UncompressedData(_currentFile->second.fileCrc32.getResult());
 		header.setFileNameLength(_currentFile->first.size());
 		header.setExtraFieldLength(0);

src/libs/utils/include/utils/Zipper.hpp

@@ -23,6 +23,8 @@
 #include <set>
 #include <filesystem>
 
+#include <Wt/WDateTime.h>
+
 #include "Exception.hpp"
 #include "utils/Crc32Calculator.hpp"
 
@@ -41,7 +43,7 @@ namespace Zip
 
 			using SizeZype = std::uint64_t;
 
-			Zipper(const std::map<std::string, std::filesystem::path>& files);
+			Zipper(const std::map<std::string, std::filesystem::path>& files, const Wt::WDateTime& lastModifiedTime = {});
 
 			static constexpr std::size_t minOutputBufferSize = 64;
 			std::size_t writeSome(std::byte* buffer, std::size_t bufferSize);
@@ -64,6 +66,7 @@ namespace Zip
 			{
 				std::filesystem::path filePath;
 				std::size_t fileSize;
+				Wt::WDateTime lastModifiedTime;
 				Utils::Crc32Calculator fileCrc32;
 				std::size_t localFileHeaderOffset {};
 			};

src/lms/ui/resource/DownloadResource.cpp

@@ -22,8 +22,8 @@
 #include <iostream>
 #include <iomanip>
 
-#include <Wt/WApplication.h>
 #include <Wt/Http/Response.h>
+#include <Wt/WLocalDateTime.h>
 
 #include "database/Artist.hpp"
 #include "database/Release.hpp"
@@ -165,7 +165,7 @@ createZipper(const std::vector<Database::Track::pointer>& tracks)
 		files.emplace(fileName, track->getPath());
 	}
 
-	return std::make_unique<Zip::Zipper>(files);
+	return std::make_unique<Zip::Zipper>(files, Wt::WLocalDateTime::currentDateTime().toUTC());
 }
 
 DownloadReleaseResource::DownloadReleaseResource(Database::IdType releaseId)