Spring request parameter request error
@RequestMapping("/query")
@ResponseBody
public ResponseEntity<Content> getByQuery(HttpServletRequest request, ContentQuery query) {
// Handle request.
}
This code will function as an http wrapper on the ContentQuery object so that I can request content with http requests from javascript. Spring auto-binding binds query parameters to a ContentQuery object.
The problem is that if someone puts an unknown parameter in the request, the ContentQuery object is instantiated and I don't know how to check if I have unexpected parameters.
Is there a way to handle this?
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then write your own validator and run it in your controller - docs.spring.io/ spring / docs / current / spring-framework-reference / .... Then you can return a ResponseEntity with whatever status you want - freakman
Thanks for the tip. Haven't used the Validator interface before, but it looks like a clean solution.
Controller:
@Autowired
private ContentQueryValidator validator;
@RequestMapping("/query")
@ResponseBody
public ResponseEntity<List<Content>> getByQuery(
HttpServletRequest request, ContentQuery query, BindingResult result) {
validator.validate(query, result);
if(result.hasErrors()){
return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
}
// No errors. Fetch content from service using query object.
}
And the validator:
@Component
public class ContentQueryValidator implements Validator{
@Override
public boolean supports(Class<?> aClass) {
return ContentQuery.class.equals(aClass);
}
@Override
public void validate(Object obj, Errors errors) {
ContentQuery query = (ContentQuery) obj;
List<Integer> contentTemplate = query.getContentTemplate();
List<Integer> displayTemplate = query.getDisplayTemplate();
if(contentTemplate == null && displayTemplate == null){
errors.reject("No query provided");
}
// More validation here..
}
}
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