Prevent apply rule creation outside of an activation context

just like object creation.

Author: Al2Klimov

lib/config/activationcontext.hpp

@@ -18,6 +18,12 @@ class ActivationContext final : public Object
 
 	static ActivationContext::Ptr GetCurrentContext();
 
+	static inline
+	void AssertOnContext()
+	{
+		GetCurrentContext();
+	}
+
 private:
 	static void PushContext(const ActivationContext::Ptr& context);
 	static void PopContext();

lib/config/applyrule.cpp

@@ -1,5 +1,6 @@
 /* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
 
+#include "config/activationcontext.hpp"
 #include "config/applyrule.hpp"
 #include "base/logger.hpp"
 #include <set>
@@ -61,6 +62,8 @@ void ApplyRule::AddRule(const String& sourceType, const String& targetType, cons
 	const Expression::Ptr& expression, const Expression::Ptr& filter, const String& package, const String& fkvar,
 	const String& fvvar, const Expression::Ptr& fterm, bool ignoreOnError, const DebugInfo& di, const Dictionary::Ptr& scope)
 {
+	ActivationContext::AssertOnContext();
+
 	auto actualTargetType (&targetType);
 
 	if (*actualTargetType == "") {