ValidationInterceptor.java
/*
* Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. licenses this file to you 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 org.wso2.carbon.mdm.services.android.common;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.cxf.interceptor.Fault;
import org.apache.cxf.jaxrs.lifecycle.ResourceProvider;
import org.apache.cxf.jaxrs.model.ClassResourceInfo;
import org.apache.cxf.jaxrs.model.OperationResourceInfo;
import org.apache.cxf.message.Message;
import org.apache.cxf.message.MessageContentsList;
import org.apache.cxf.phase.AbstractPhaseInterceptor;
import org.apache.cxf.phase.Phase;
import javax.validation.*;
import javax.validation.executable.ExecutableValidator;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Set;
public class ValidationInterceptor extends AbstractPhaseInterceptor<Message> {
private Log log = LogFactory.getLog(getClass());
private Validator validator = null; //validator interface is thread-safe
public ValidationInterceptor() {
super(Phase.PRE_INVOKE);
ValidatorFactory defaultFactory = Validation.buildDefaultValidatorFactory();
validator = defaultFactory.getValidator();
if (validator == null) {
log.warn("Bean Validation provider could not be found, no validation will be performed");
} else {
log.debug("Validation In-Interceptor initialized successfully");
}
}
@Override
public void handleMessage(Message message) throws Fault {
final OperationResourceInfo operationResource = message.getExchange().get(OperationResourceInfo.class);
if (operationResource == null) {
log.info("OperationResourceInfo is not available, skipping validation");
return;
}
final ClassResourceInfo classResource = operationResource.getClassResourceInfo();
if (classResource == null) {
log.info("ClassResourceInfo is not available, skipping validation");
return;
}
final ResourceProvider resourceProvider = classResource.getResourceProvider();
if (resourceProvider == null) {
log.info("ResourceProvider is not available, skipping validation");
return;
}
final List<Object> arguments = MessageContentsList.getContentsList(message);
final Method method = operationResource.getAnnotatedMethod();
final Object instance = resourceProvider.getInstance(message);
if (method != null && arguments != null) {
//validate the parameters(arguments) over the invoked method
validate(method, arguments.toArray(), instance);
//validate the fields of each argument
for (Object arg : arguments) {
if (arg != null)
validate(arg);
}
}
}
public <T> void validate(final Method method, final Object[] arguments, final T instance) {
if (validator == null) {
log.warn("Bean Validation provider could not be found, no validation will be performed");
return;
}
ExecutableValidator methodValidator = validator.forExecutables();
Set<ConstraintViolation<T>> violations = methodValidator.validateParameters(instance,
method, arguments);
if (!violations.isEmpty()) {
throw new ConstraintViolationException(violations);
}
}
public <T> void validate(final T object) {
if (validator == null) {
log.warn("Bean Validation provider could be found, no validation will be performed");
return;
}
Set<ConstraintViolation<T>> violations = validator.validate(object);
if (!violations.isEmpty()) {
throw new ConstraintViolationException(violations);
}
}
public void handleFault(Message messageParam) {
}
}