/*
* Copyright 2012-2017 the original author or 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 org.springframework.boot.context.properties.bind.validation;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.stream.Collectors;
import org.springframework.boot.context.properties.bind.AbstractBindHandler;
import org.springframework.boot.context.properties.bind.BindContext;
import org.springframework.boot.context.properties.bind.BindHandler;
import org.springframework.boot.context.properties.bind.Bindable;
import org.springframework.boot.context.properties.source.ConfigurationProperty;
import org.springframework.boot.context.properties.source.ConfigurationPropertyName;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.validation.BeanPropertyBindingResult;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Validator;
import org.springframework.validation.annotation.Validated;
/**
* {@link BindHandler} to apply {@link Validator Validators} to bound results.
*
* @author Phillip Webb
* @author Madhura Bhave
* @since 2.0.0
*/
public class ValidationBindHandler extends AbstractBindHandler {
private final Validator[] validators;
private boolean validate;
private final Set<ConfigurationProperty> boundProperties = new LinkedHashSet<>();
public ValidationBindHandler(Validator... validators) {
super();
this.validators = validators;
}
public ValidationBindHandler(BindHandler parent, Validator... validators) {
super(parent);
this.validators = validators;
}
@Override
public boolean onStart(ConfigurationPropertyName name, Bindable<?> target,
BindContext context) {
if (context.getDepth() == 0) {
this.validate = shouldValidate(target);
}
return super.onStart(name, target, context);
}
private boolean shouldValidate(Bindable<?> target) {
Validated annotation = AnnotationUtils
.findAnnotation(target.getBoxedType().resolve(), Validated.class);
return (annotation != null);
}
@Override
public Object onSuccess(ConfigurationPropertyName name, Bindable<?> target,
BindContext context, Object result) {
if (context.getConfigurationProperty() != null) {
this.boundProperties.add(context.getConfigurationProperty());
}
return super.onSuccess(name, target, context, result);
}
@Override
public void onFinish(ConfigurationPropertyName name, Bindable<?> target,
BindContext context, Object result) throws Exception {
if (this.validate) {
validate(name, target, result);
}
super.onFinish(name, target, context, result);
}
private void validate(ConfigurationPropertyName name, Bindable<?> target,
Object result) {
Object validationTarget = getValidationTarget(target, result);
Class<?> validationType = target.getBoxedType().resolve();
validate(name, validationTarget, validationType);
}
private Object getValidationTarget(Bindable<?> target, Object result) {
if (result != null) {
return result;
}
if (target.getValue() != null) {
return target.getValue().get();
}
return null;
}
private void validate(ConfigurationPropertyName name, Object target, Class<?> type) {
if (target != null) {
BindingResult errors = new BeanPropertyBindingResult(target, name.toString());
Arrays.stream(this.validators).filter((v) -> v.supports(type))
.forEach((v) -> v.validate(target, errors));
if (errors.hasErrors()) {
throwBindValidationException(name, errors);
}
}
}
private void throwBindValidationException(ConfigurationPropertyName name,
BindingResult errors) {
Set<ConfigurationProperty> boundProperties = this.boundProperties.stream()
.filter((property) -> name.isAncestorOf(property.getName()))
.collect(Collectors.toCollection(LinkedHashSet::new));
ValidationErrors validationErrors = new ValidationErrors(name, boundProperties,
errors.getAllErrors());
throw new BindValidationException(validationErrors);
}
}