GUI: Begin IPC mechanism to open files despite sandboxing

gui/ipcserver.cpp

@@ -0,0 +1,88 @@
+#include <QFile>
+#include <QDesktopServices>
+#include <QSettings>
+#include <QProcess>
+#include <QUrl>
+#include <QLocalSocket>
+#include <QDataStream>
+#include "ipcserver.h"
+
+IpcServer::IpcServer()
+{
+	connect(&this->spawningServer, &QLocalServer::newConnection, this, &IpcServer::spawnerNewConnection);
+}
+
+bool IpcServer::startSpawner(QString socketPath)
+{
+	QFile::remove(socketPath);
+	return this->spawningServer.listen(socketPath);
+}
+
+bool IpcServer::docOpen(QString path, int pagenum)
+{
+	QSettings settings;
+	QString command = settings.value("pdfviewer").toString();
+	if(command != "" && command.contains("%p") && command.contains("%f"))
+	{
+		QStringList splitted = command.split(" ");
+		if(splitted.size() > 1)
+		{
+			QString cmd = splitted[0];
+			QStringList args = splitted.mid(1);
+			args.replaceInStrings("%f", path);
+			args.replaceInStrings("%p", QString::number(pagenum));
+
+			QProcess::startDetached(cmd, args);
+		}
+	}
+	else
+	{
+		QDesktopServices::openUrl(QUrl::fromLocalFile(path));
+	}
+	return true;
+}
+
+bool IpcServer::fileOpen(QString path)
+{
+	return QDesktopServices::openUrl(QUrl::fromLocalFile(path));
+}
+
+void IpcServer::spawnerNewConnection()
+{
+	QScopedPointer<QLocalSocket> socket{this->spawningServer.nextPendingConnection()};
+	if(!socket.isNull())
+	{
+		if(!socket->waitForReadyRead())
+		{
+			return;
+		}
+		QDataStream stream(socket.get());
+		IPCCommand command;
+		QStringList args;
+		stream >> command;
+		stream >> args;
+		if(args.size() < 1)
+		{
+			stream << "invalid";
+			return;
+		}
+		if(command == DocOpen)
+		{
+			if(args.size() < 2)
+			{
+				stream << "invalid";
+				return;
+			}
+			docOpen(args[0], args[2].toInt());
+		}
+		if(command == FileOpen)
+		{
+			if(args.size() < 1)
+			{
+				stream << "invalid";
+				return;
+			}
+			fileOpen(args[0]);
+		}
+	}
+}