Annotation to modify a request parameter

Question

How to modify a request parameter (@RequestParam String bar) before entering in the controller ?

Ideally I'd like to create an annotation :

@RequestMapping(method = GET, path = "foo")
public ResponseEntity<String> getBar(@RequestParam @Sanitize("bar") String bar) {

    // bar is sanitized

    /** method body *//
}

According to this question, I tried to create the interface Sanitize:

@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
public @interface Sanitize {
    String value();
}

And a resolver SanitizeResolver

public class SanitizeResolver implements HandlerMethodArgumentResolver {

    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return parameter.getParameterAnnotation(Sanitize.class) != null;
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
                                  NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        Sanitize attr = parameter.getParameterAnnotation(Sanitize.class);
        return MyUtils.sanitize(webRequest.getParameter(attr.value()));
    }
}

And to add the resolver to my WebMvcConfigurerAdapter's resolver:

@Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
    argumentResolvers.add(new SanitizeResolver());
}

The resolver is well added but never called.

I'm using Spring 4.2.6.RELEASE. Do I miss something, and if can't work, is there a better solution ?

At the moment, the resolver for `@RequestParam` is getting chosen _before_ your custom resolver. — Sotirios Delimanolis, Aug 26 '16 at 14:48
Thank you for your answer. So currently there is no way to achieve that I guess ? — Pleymor, Aug 27 '16 at 17:08

score 1 · Accepted Answer · answered Aug 29 '16 at 07:56

1

The solution was to remove @RequestParam, thanks Sotirios Delimanolis !

answered Aug 29 '16 at 07:56

Pleymor

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Annotation to modify a request parameter

1 Answers1