Access to method signature variables in annotation

Question

How is it possible to access variables from method signature?

In spring security there is the @PreAuthorize annotation that can make use of hasPermission and access variables passed to the method with #locationDTO

@PreAuthorize("hasPermission(#locationDTO.parent, 'Location', 'LOCATION_CREATE') ")
public ResponseEntity createLocation(@RequestBody Location locationDTO) {
     .....
}

I would like to create a custom annotation that has access to the variables in the same way - how is that possible?

What are you looking for? @MyNewAnnotation(abc = #locationDTO.parent) or @MyNewAnnotation("myNewFunction(#locationDTO.parent)") — Glen Mazza, Sep 07 '20 at 18:54
I am looking for @MyNewAnnotation(permission = "SOMETHING", target = "locationDTO.parent") — Alex Tbk, Sep 07 '20 at 19:24
Does my answer about [how to evaluate SpEL (Spring Expression Language)](https://stackoverflow.com/a/53825701/1082681) help? — kriegaex, Sep 08 '20 at 00:59

score 0 · Accepted Answer · answered Sep 08 '20 at 07:45

Found out how:

MethodSignature methodSignature = (MethodSignature) proceedingJoinPoint.getSignature();
ParameterNameDiscoverer parameterNameDiscoverer = new 
DefaultSecurityParameterNameDiscoverer();
String[] parameterNames = parameterNameDiscoverer.getParameterNames(methodSignature.getMethod());

returns the list of parameter names, which can be access then.

Access to method signature variables in annotation

1 Answers1