pollymc/api/logic/FileSystem.cpp

// Licensed under the Apache-2.0 license. See README.md for details.

#include "FileSystem.h"

#include <QDir>
#include <QFile>
#include <QSaveFile>
#include <QFileInfo>
#include <QDebug>
#include <QUrl>
#include <QStandardPaths>
#include <QTextStream>

#if defined Q_OS_WIN32
	#include <windows.h>
	#include <string>
	#include <sys/utime.h>
	#include <winnls.h>
	#include <shobjidl.h>
	#include <objbase.h>
	#include <objidl.h>
	#include <shlguid.h>
	#include <shlobj.h>
#else
	#include <utime.h>
#endif

namespace FS {

void ensureExists(const QDir &dir)
{
	if (!QDir().mkpath(dir.absolutePath()))
	{
		throw FileSystemException("Unable to create folder " + dir.dirName() + " (" +
									  dir.absolutePath() + ")");
	}
}

void write(const QString &filename, const QByteArray &data)
{
	ensureExists(QFileInfo(filename).dir());
	QSaveFile file(filename);
	if (!file.open(QSaveFile::WriteOnly))
	{
		throw FileSystemException("Couldn't open " + filename + " for writing: " +
								  file.errorString());
	}
	if (data.size() != file.write(data))
	{
		throw FileSystemException("Error writing data to " + filename + ": " +
								  file.errorString());
	}
	if (!file.commit())
	{
		throw FileSystemException("Error while committing data to " + filename + ": " +
								  file.errorString());
	}
}

QByteArray read(const QString &filename)
{
	QFile file(filename);
	if (!file.open(QFile::ReadOnly))
	{
		throw FileSystemException("Unable to open " + filename + " for reading: " +
								  file.errorString());
	}
	const qint64 size = file.size();
	QByteArray data(int(size), 0);
	const qint64 ret = file.read(data.data(), size);
	if (ret == -1 || ret != size)
	{
		throw FileSystemException("Error reading data from " + filename + ": " +
								  file.errorString());
	}
	return data;
}

bool updateTimestamp(const QString& filename)
{
#ifdef Q_OS_WIN32
	std::wstring filename_utf_16 = filename.toStdWString();
	return (_wutime64(filename_utf_16.c_str(), nullptr) == 0);
#else
	QByteArray filenameBA = QFile::encodeName(filename);
	return (utime(filenameBA.data(), nullptr) == 0);
#endif
}

bool ensureFilePathExists(QString filenamepath)
{
	QFileInfo a(filenamepath);
	QDir dir;
	QString ensuredPath = a.path();
	bool success = dir.mkpath(ensuredPath);
	return success;
}

bool ensureFolderPathExists(QString foldernamepath)
{
	QFileInfo a(foldernamepath);
	QDir dir;
	QString ensuredPath = a.filePath();
	bool success = dir.mkpath(ensuredPath);
	return success;
}

bool copy::operator()(const QString &offset)
{
	//NOTE always deep copy on windows. the alternatives are too messy.
	#if defined Q_OS_WIN32
	m_followSymlinks = true;
	#endif

	auto src = PathCombine(m_src.absolutePath(), offset);
	auto dst = PathCombine(m_dst.absolutePath(), offset);

	QFileInfo currentSrc(src);
	if (!currentSrc.exists())
		return false;

	if(!m_followSymlinks && currentSrc.isSymLink())
	{
		qDebug() << "creating symlink" << src << " - " << dst;
		if (!ensureFilePathExists(dst))
		{
			qWarning() << "Cannot create path!";
			return false;
		}
		return QFile::link(currentSrc.symLinkTarget(), dst);
	}
	else if(currentSrc.isFile())
	{
		qDebug() << "copying file" << src << " - " << dst;
		if (!ensureFilePathExists(dst))
		{
			qWarning() << "Cannot create path!";
			return false;
		}
		return QFile::copy(src, dst);
	}
	else if(currentSrc.isDir())
	{
		qDebug() << "recursing" << offset;
		if (!ensureFolderPathExists(dst))
		{
			qWarning() << "Cannot create path!";
			return false;
		}
		QDir currentDir(src);
		for(auto & f : currentDir.entryList(QDir::Files | QDir::Dirs | QDir::NoDotAndDotDot | QDir::Hidden | QDir::System))
		{
			auto inner_offset = PathCombine(offset, f);
			// ignore and skip stuff that matches the blacklist.
			if(m_blacklist && m_blacklist->matches(inner_offset))
			{
				continue;
			}
			if(!operator()(inner_offset))
			{
				qWarning() << "Failed to copy" << inner_offset;
				return false;
			}
		}
	}
	else
	{
		qCritical() << "Copy ERROR: Unknown filesystem object:" << src;
		return false;
	}
	return true;
}

bool deletePath(QString path)
{
	bool OK = true;
	QDir dir(path);

	if (!dir.exists())
	{
		return OK;
	}
	auto allEntries = dir.entryInfoList(QDir::NoDotAndDotDot | QDir::System | QDir::Hidden |
										QDir::AllDirs | QDir::Files,
										QDir::DirsFirst);

	for(auto & info: allEntries)
	{
#if defined Q_OS_WIN32
		QString nativePath = QDir::toNativeSeparators(info.absoluteFilePath());
		auto wString = nativePath.toStdWString();
		DWORD dwAttrs = GetFileAttributesW(wString.c_str());
		// Windows: check for junctions, reparse points and other nasty things of that sort
		if(dwAttrs & FILE_ATTRIBUTE_REPARSE_POINT)
		{
			if (info.isFile())
			{
				OK &= QFile::remove(info.absoluteFilePath());
			}
			else if (info.isDir())
			{
				OK &= dir.rmdir(info.absoluteFilePath());
			}
		}
#else
		// We do not trust Qt with reparse points, but do trust it with unix symlinks.
		if(info.isSymLink())
		{
			OK &= QFile::remove(info.absoluteFilePath());
		}
#endif
		else if (info.isDir())
		{
			OK &= deletePath(info.absoluteFilePath());
		}
		else if (info.isFile())
		{
			OK &= QFile::remove(info.absoluteFilePath());
		}
		else
		{
			OK = false;
			qCritical() << "Delete ERROR: Unknown filesystem object:" << info.absoluteFilePath();
		}
	}
	OK &= dir.rmdir(dir.absolutePath());
	return OK;
}


QString PathCombine(const QString & path1, const QString & path2)
{
	if(!path1.size())
		return path2;
	if(!path2.size())
		return path1;
    return QDir::cleanPath(path1 + QDir::separator() + path2);
}

QString PathCombine(const QString & path1, const QString & path2, const QString & path3)
{
	return PathCombine(PathCombine(path1, path2), path3);
}

QString PathCombine(const QString & path1, const QString & path2, const QString & path3, const QString & path4)
{
	return PathCombine(PathCombine(path1, path2, path3), path4);
}

QString AbsolutePath(QString path)
{
	return QFileInfo(path).absolutePath();
}

QString ResolveExecutable(QString path)
{
	if (path.isEmpty())
	{
		return QString();
	}
	if(!path.contains('/'))
	{
		path = QStandardPaths::findExecutable(path);
	}
	QFileInfo pathInfo(path);
	if(!pathInfo.exists() || !pathInfo.isExecutable())
	{
		return QString();
	}
	return pathInfo.absoluteFilePath();
}

/**
 * Normalize path
 *
 * Any paths inside the current folder will be normalized to relative paths (to current)
 * Other paths will be made absolute
 */
QString NormalizePath(QString path)
{
	QDir a = QDir::currentPath();
	QString currentAbsolute = a.absolutePath();

	QDir b(path);
	QString newAbsolute = b.absolutePath();

	if (newAbsolute.startsWith(currentAbsolute))
	{
		return a.relativeFilePath(newAbsolute);
	}
	else
	{
		return newAbsolute;
	}
}

QString badFilenameChars = "\"\\/?<>:*|!";

QString RemoveInvalidFilenameChars(QString string, QChar replaceWith)
{
	for (int i = 0; i < string.length(); i++)
	{
		if (badFilenameChars.contains(string[i]))
		{
			string[i] = replaceWith;
		}
	}
	return string;
}

QString DirNameFromString(QString string, QString inDir)
{
	int num = 0;
	QString baseName = RemoveInvalidFilenameChars(string, '-');
	QString dirName;
	do
	{
		if(num == 0)
		{
			dirName = baseName;
		}
		else
		{
			dirName = baseName + QString::number(num);;
		}

		// If it's over 9000
		if (num > 9000)
			return "";
		num++;
	} while (QFileInfo(PathCombine(inDir, dirName)).exists());
	return dirName;
}

// Does the folder path contain any '!'? If yes, return true, otherwise false.
// (This is a problem for Java)
bool checkProblemticPathJava(QDir folder)
{
	QString pathfoldername = folder.absolutePath();
	return pathfoldername.contains("!", Qt::CaseInsensitive);
}

// Win32 crap
#if defined Q_OS_WIN

bool called_coinit = false;

HRESULT CreateLink(LPCSTR linkPath, LPCSTR targetPath, LPCSTR args)
{
	HRESULT hres;

	if (!called_coinit)
	{
		hres = CoInitialize(NULL);
		called_coinit = true;

		if (!SUCCEEDED(hres))
		{
			qWarning("Failed to initialize COM. Error 0x%08X", hres);
			return hres;
		}
	}

	IShellLink *link;
	hres = CoCreateInstance(CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER, IID_IShellLink,
							(LPVOID *)&link);

	if (SUCCEEDED(hres))
	{
		IPersistFile *persistFile;

		link->SetPath(targetPath);
		link->SetArguments(args);

		hres = link->QueryInterface(IID_IPersistFile, (LPVOID *)&persistFile);
		if (SUCCEEDED(hres))
		{
			WCHAR wstr[MAX_PATH];

			MultiByteToWideChar(CP_ACP, 0, linkPath, -1, wstr, MAX_PATH);

			hres = persistFile->Save(wstr, TRUE);
			persistFile->Release();
		}
		link->Release();
	}
	return hres;
}

#endif

QString getDesktopDir()
{
	return QStandardPaths::writableLocation(QStandardPaths::DesktopLocation);
}

// Cross-platform Shortcut creation
bool createShortCut(QString location, QString dest, QStringList args, QString name,
						  QString icon)
{
#if defined Q_OS_LINUX
	location = PathCombine(location, name + ".desktop");

	QFile f(location);
	f.open(QIODevice::WriteOnly | QIODevice::Text);
	QTextStream stream(&f);

	QString argstring;
	if (!args.empty())
		argstring = " '" + args.join("' '") + "'";

	stream << "[Desktop Entry]"
		   << "\n";
	stream << "Type=Application"
		   << "\n";
	stream << "TryExec=" << dest.toLocal8Bit() << "\n";
	stream << "Exec=" << dest.toLocal8Bit() << argstring.toLocal8Bit() << "\n";
	stream << "Name=" << name.toLocal8Bit() << "\n";
	stream << "Icon=" << icon.toLocal8Bit() << "\n";

	stream.flush();
	f.close();

	f.setPermissions(f.permissions() | QFileDevice::ExeOwner | QFileDevice::ExeGroup |
					 QFileDevice::ExeOther);

	return true;
#elif defined Q_OS_WIN
	// TODO: Fix
	//	QFile file(PathCombine(location, name + ".lnk"));
	//	WCHAR *file_w;
	//	WCHAR *dest_w;
	//	WCHAR *args_w;
	//	file.fileName().toWCharArray(file_w);
	//	dest.toWCharArray(dest_w);

	//	QString argStr;
	//	for (int i = 0; i < args.count(); i++)
	//	{
	//		argStr.append(args[i]);
	//		argStr.append(" ");
	//	}
	//	argStr.toWCharArray(args_w);

	//	return SUCCEEDED(CreateLink(file_w, dest_w, args_w));
	return false;
#else
	qWarning("Desktop Shortcuts not supported on your platform!");
	return false;
#endif
}
}