1 files changed, 295 insertions, 0 deletions
diff --git a/src/input/inputEventHandler.h b/src/input/inputEventHandler.h
new file mode 100644
index 0000000..52e3338
--- /dev/null
+++ b/src/input/inputEventHandler.h
@@ -0,0 +1,295 @@
+/*
+ # Copyright (c) 2009 - OpenSLX Project, Computer Center University of Freiburg
+ #
+ # This program is free software distributed under the GPL version 2.
+ # See http://openslx.org/COPYING
+ #
+ # If you have any feedback please consult http://openslx.org/feedback and
+ # send your suggestions, praise, or complaints to feedback@openslx.org
+ #
+ # General information about OpenSLX can be found at http://openslx.org/
+ # --------------------------------------------------------------------------
+ # inputEventHandler.h:
+ #  - Common definitions for input event handlers
+ # --------------------------------------------------------------------------
+ */
+
+#ifndef INPUTEVENTHANDLER_H_
+#define INPUTEVENTHANDLER_H_
+
+#include <QtGlobal>
+#include <QtDebug>
+#include <QList>
+#include <QString>
+#include <QCoreApplication>
+#include <boost/mpl/contains.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/vector.hpp>
+#include <src/input/inputEvent.h>
+
+#define HANDLER_TYPE_DONT_CARE 0xffff
+#define HANDLER_CODE_DONT_CARE 0xffff
+#define HANDLER_VALUE_DONT_CARE 0xffffffff
+
+class InputEventContext
+{
+public:
+	virtual pid_t getSenderPid() const = 0;
+	virtual uid_t getSenderUid() const = 0;
+	virtual gid_t getSenderGid() const = 0;
+};
+
+struct SpecialInputEventDescription
+{
+	SpecialInputEventDescription(QString const& d, quint16 t, quint16 c, quint32 v = 0)
+		: descriptionString(d), evtType(t), evtCode(c), evtValue(v)
+	{
+	}
+
+	QString descriptionString;
+	quint16 evtType;
+	quint16 evtCode;
+	quint32 evtValue;
+
+	InputEvent toEvent() const
+	{
+		return InputEvent(evtType, evtCode, evtValue);
+	}
+};
+
+template<quint16 Type = HANDLER_TYPE_DONT_CARE,
+		quint16 Code = HANDLER_CODE_DONT_CARE,
+		quint32 Value = HANDLER_VALUE_DONT_CARE>
+class DefaultInputEventHandler {
+protected:
+	static QString tr(char const* string)
+	{
+		return QCoreApplication::translate("InputEventHandler", string);
+	}
+
+public:
+	virtual bool matches(InputEvent const& evt, InputEventContext const*) {
+		if(Type != HANDLER_TYPE_DONT_CARE) {
+			if(evt.type() != Type)
+				return false;
+		}
+		if(Code != HANDLER_CODE_DONT_CARE) {
+			if(evt.code() != Code)
+				return false;
+		}
+		if(Value != HANDLER_VALUE_DONT_CARE) {
+			if(evt.value() != Value)
+				return false;
+		}
+		return true;
+	}
+
+	virtual void initialize()
+	{
+	}
+
+	virtual void handle(InputEvent const& evt, InputEventContext const*) = 0;
+
+	static void describeInto(QList<SpecialInputEventDescription>& description)
+	{
+	}
+};
+
+namespace policy {
+
+enum SecurityFlags {
+	SEC_FREE_FOR_ALL,
+	SEC_PHYSICAL_OR_PRIVILEGED
+};
+
+bool allowPhysicalSeat(InputEvent const& evt, InputEventContext const* ctx);
+bool allowPrivilegedUser(InputEvent const& evt, InputEventContext const* ctx);
+
+struct SecurityAllowAny
+{
+	bool allow(InputEvent const& evt, InputEventContext const* ctx)
+	{
+		return true;
+	}
+};
+
+struct SecurityAllowPhysicalOrPrivileged
+{
+	bool allow(InputEvent const& evt, InputEventContext const* ctx)
+	{
+		if(allowPhysicalSeat(evt, ctx))
+			return true;
+		else if(allowPrivilegedUser(evt, ctx))
+			return true;
+		return false;
+	}
+};
+
+struct UnixLike;
+struct Linux;
+struct Windows;
+
+#if defined(__linux)
+typedef boost::mpl::vector2<UnixLike,Linux>::type Systems;
+#elif defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__) || defined(__WINDOWS__)
+typedef boost::mpl::vector1<Windows>::type Systems;
+#else
+# error "Porting is needed!"
+#endif
+
+struct SystemEnabled;
+struct SystemDisabled;
+
+template<typename System>
+struct RequireSystem
+{
+	typedef typename boost::mpl::contains<Systems, System>::type enabled_type;
+	static const bool enabled = enabled_type::value;
+};
+
+struct RequireNoSystem
+{
+	typedef boost::mpl::bool_<true>::type enabled_type;
+	static const bool enabled = enabled_type::value;
+};
+
+}
+
+template<bool Enabled, typename Delegate, typename SecurityPolicy>
+class HandlerHelper
+{
+public:
+	bool handle(InputEvent const& evt, InputEventContext const* context = 0) {
+		if(!securityPolicy.allow(evt, context))
+		{
+			std::string evtStr = evt.toString();
+			qWarning("Input Event %s has been denied by security policy", evtStr.c_str());
+			return true;
+		}
+		if(delegate.matches(evt, context)) {
+			delegate.handle(evt, context);
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	void initialize()
+	{
+		delegate.initialize();
+	}
+
+	static void describeInto(QList<SpecialInputEventDescription>& list)
+	{
+		Delegate::describeInto(list);
+	}
+
+private:
+	Delegate delegate;
+	SecurityPolicy securityPolicy;
+};
+
+template<typename Delegate, typename SecurityPolicy>
+class HandlerHelper<false, Delegate, SecurityPolicy>
+{
+public:
+	bool handle(InputEvent const& evt, InputEventContext const* context = 0) {
+		return false;
+	}
+
+	void initialize()
+	{
+	}
+
+	static void describeInto(QList<SpecialInputEventDescription>&)
+	{
+	}
+};
+
+template<typename Delegate, typename SystemPolicy = policy::RequireNoSystem, typename SecurityPolicy = void>
+struct Handler : public HandlerHelper<SystemPolicy::enabled, Delegate, SecurityPolicy>
+{
+};
+
+template<typename DefaultSecurityPolicy, typename HandlerType>
+struct ApplyDefaultSecurityPolicy
+{
+	typedef HandlerType type;
+};
+
+template<typename DefaultSecurityPolicy, typename Delegate, typename SystemPolicy>
+struct ApplyDefaultSecurityPolicy<DefaultSecurityPolicy, Handler<Delegate, SystemPolicy, void> >
+{
+	typedef Handler<Delegate, SystemPolicy, DefaultSecurityPolicy> type;
+};
+
+template<typename DefaultSecurityPolicy, typename Begin, typename End>
+struct InputEventHandlerChainHelper
+{
+private:
+	typedef typename boost::mpl::next<Begin>::type next_iterator_type;
+	typedef InputEventHandlerChainHelper<DefaultSecurityPolicy, next_iterator_type, End> next_in_chain;
+
+	typedef typename boost::mpl::deref<Begin>::type handler_entry_type;
+	typedef typename ApplyDefaultSecurityPolicy<DefaultSecurityPolicy, handler_entry_type>::type handler_type;
+
+	handler_type _handler;
+	next_in_chain _next;
+
+public:
+	void handle(InputEvent const& evt, InputEventContext const* context = 0) {
+		if(!_handler.handle(evt, context)) {
+			_next.handle(evt, context);
+		}
+	}
+
+	void initialize() {
+		_handler.initialize();
+		_next.initialize();
+	}
+
+	static void describeInto(QList<SpecialInputEventDescription>& list)
+	{
+		handler_type::describeInto(list);
+		next_in_chain::describeInto(list);
+	}
+
+	static QList<SpecialInputEventDescription> describe()
+	{
+		QList<SpecialInputEventDescription> list;
+		describeInto(list);
+		return list;
+	}
+};
+
+template<typename DefaultSecurityPolicy, typename End>
+struct InputEventHandlerChainHelper<DefaultSecurityPolicy, End, End>
+{
+	void handle(InputEvent const&, InputEventContext const* context = 0) {
+		// do nothing
+	}
+
+	void initialize() {
+		// do nothing
+	}
+
+	static void describeInto(QList<SpecialInputEventDescription>&)
+	{
+		// do nothing
+	}
+
+	static QList<SpecialInputEventDescription> describe()
+	{
+		return QList<SpecialInputEventDescription>();
+	}
+};
+
+template<typename DefaultSecurityPolicy, typename Collection>
+struct InputEventHandlerChain :
+	public InputEventHandlerChainHelper<DefaultSecurityPolicy,
+		typename boost::mpl::begin<Collection>::type,
+		typename boost::mpl::end<Collection>::type>
+{
+};
+
+#endif /* INPUTEVENTHANDLER_H_ */