io.micronaut.validation.exceptions.ConstraintExceptionHandler Maven / Gradle / Ivy
/*
* Copyright 2017-2020 original authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.micronaut.validation.exceptions;
import io.micronaut.context.annotation.Requires;
import io.micronaut.http.HttpRequest;
import io.micronaut.http.HttpResponse;
import io.micronaut.http.HttpStatus;
import io.micronaut.http.annotation.Produces;
import io.micronaut.http.hateoas.JsonError;
import io.micronaut.http.hateoas.Link;
import io.micronaut.http.hateoas.Resource;
import io.micronaut.http.server.exceptions.ExceptionHandler;
import javax.inject.Singleton;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.ElementKind;
import javax.validation.Path;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
/**
* Default {@link ExceptionHandler} for {@link ConstraintViolationException}.
*
* @author Graeme Rocher
* @since 1.0
*/
@Produces
@Singleton
@Requires(classes = {ConstraintViolationException.class, ExceptionHandler.class})
public class ConstraintExceptionHandler implements ExceptionHandler> {
@Override
public HttpResponse handle(HttpRequest request, ConstraintViolationException exception) {
Set> constraintViolations = exception.getConstraintViolations();
if (constraintViolations == null || constraintViolations.isEmpty()) {
JsonError error = new JsonError(exception.getMessage() == null ? HttpStatus.BAD_REQUEST.getReason() : exception.getMessage());
error.link(Link.SELF, Link.of(request.getUri()));
return HttpResponse.badRequest(error);
} else if (constraintViolations.size() == 1) {
ConstraintViolation violation = constraintViolations.iterator().next();
JsonError error = new JsonError(buildMessage(violation));
error.link(Link.SELF, Link.of(request.getUri()));
return HttpResponse.badRequest(error);
} else {
JsonError error = new JsonError(HttpStatus.BAD_REQUEST.getReason());
List errors = new ArrayList<>();
for (ConstraintViolation violation : constraintViolations) {
errors.add(new JsonError(buildMessage(violation)));
}
error.embedded("errors", errors);
error.link(Link.SELF, Link.of(request.getUri()));
return HttpResponse.badRequest(error);
}
}
/**
* Builds a message based on the provided violation.
*
* @param violation The constraint violation
* @return The violation message
*/
protected String buildMessage(ConstraintViolation violation) {
Path propertyPath = violation.getPropertyPath();
StringBuilder message = new StringBuilder();
Iterator i = propertyPath.iterator();
while (i.hasNext()) {
Path.Node node = i.next();
if (node.getKind() == ElementKind.METHOD || node.getKind() == ElementKind.CONSTRUCTOR) {
continue;
}
message.append(node.getName());
if (i.hasNext()) {
message.append('.');
}
}
message.append(": ").append(violation.getMessage());
return message.toString();
}
}