1 files changed, 89 insertions, 0 deletions
diff --git a/logic/JavaChecker.cpp b/logic/JavaChecker.cpp
new file mode 100644
index 00000000..10b84fe1
--- /dev/null
+++ b/logic/JavaChecker.cpp
@@ -0,0 +1,89 @@
+#include "JavaChecker.h"
+#include <QFile>
+#include <QProcess>
+
+#define CHECKER_FILE "JavaChecker.jar"
+
+JavaChecker::JavaChecker(QObject *parent) : QObject(parent)
+{
+}
+
+int JavaChecker::performCheck(QString path)
+{
+	if(QFile::exists(CHECKER_FILE))
+	{
+		QFile::remove(CHECKER_FILE);
+	}
+	// extract the checker
+	QFile(":/java/checker.jar").copy(CHECKER_FILE);
+
+	QStringList args = {"-jar", CHECKER_FILE};
+
+	process.reset(new QProcess());
+	process->setArguments(args);
+	process->setProgram(path);
+	process->setProcessChannelMode(QProcess::SeparateChannels);
+
+	connect(process.get(), SIGNAL(finished(int, QProcess::ExitStatus)), this,
+			SLOT(finished(int, QProcess::ExitStatus)));
+	connect(process.get(), SIGNAL(error(QProcess::ProcessError)), this,
+			SLOT(error(QProcess::ProcessError)));
+	connect(&killTimer, SIGNAL(timeout()), SLOT(timeout()));
+	killTimer.setSingleShot(true);
+	killTimer.start(5000);
+	process->start();
+}
+
+void JavaChecker::finished(int exitcode, QProcess::ExitStatus status)
+{
+	killTimer.stop();
+	QProcessPtr _process;
+	_process.swap(process);
+
+	if (status == QProcess::CrashExit || exitcode == 1)
+	{
+		emit checkFinished({});
+		return;
+	}
+
+	QString p_stdout = _process->readAllStandardOutput();
+	auto parts = p_stdout.split('=', QString::SkipEmptyParts);
+	if (parts.size() != 2 || parts[0] != "os.arch")
+	{
+		emit checkFinished({});
+		return;
+	}
+
+	auto os_arch = parts[1].remove('\n').remove('\r');
+	bool is_64 = os_arch == "x86_64" || os_arch == "amd64";
+
+	JavaCheckResult result;
+	{
+		result.valid = true;
+		result.is_64bit = is_64;
+		result.mojangPlatform = is_64 ? "64" : "32";
+		result.realPlatform = os_arch;
+	}
+	emit checkFinished(result);
+}
+
+void JavaChecker::error(QProcess::ProcessError err)
+{
+	if(err == QProcess::FailedToStart)
+	{
+		killTimer.stop();
+		emit checkFinished({});
+		return;
+	}
+}
+
+void JavaChecker::timeout()
+{
+	// NO MERCY. NO ABUSE.
+	if(process)
+	{
+		process->kill();
+		process.reset();
+		emit checkFinished({});
+	}
+}