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/*
* =============================================================================
*
* Copyright (c) 2011-2014, The THYMELEAF team (http://www.thymeleaf.org)
*
* 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.thymeleaf.spring4.requestdata;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.support.RequestContext;
import org.thymeleaf.context.ITemplateContext;
import org.thymeleaf.context.IWebContext;
import org.thymeleaf.exceptions.ConfigurationException;
import org.thymeleaf.exceptions.TemplateProcessingException;
import org.thymeleaf.spring4.naming.SpringContextVariableNames;
import org.thymeleaf.spring4.util.SpringVersionUtils;
import org.thymeleaf.util.ClassLoaderUtils;
/**
*
* Utility class used for applying the org.springframework.web.servlet.support.RequestDataValueProcessor
* interface to URLs and forms output by Thymeleaf.
*
*
* This Spring interface only exists since Spring 3.1, but was modified in Spring 4. This class will only
* apply this value processor if the version of Spring is 4 or newer.
*
*
* @author Daniel Fernández
*
* @since 2.1.0
*
*/
public final class RequestDataValueProcessorUtils {
private static final boolean canApply;
private static final String SPRING4_DELEGATE_CLASS =
"org.thymeleaf.spring4.requestdata.RequestDataValueProcessor4Delegate";
private static final IRequestDataValueProcessorDelegate spring4Delegate;
private static final Logger LOGGER = LoggerFactory.getLogger(RequestDataValueProcessorUtils.class);
static {
canApply = SpringVersionUtils.isSpring40AtLeast();
final ClassLoader classLoader = ClassLoaderUtils.getClassLoader(RequestDataValueProcessorUtils.class);
if (canApply) {
try {
final Class implClass = Class.forName(SPRING4_DELEGATE_CLASS, true, classLoader);
spring4Delegate = (IRequestDataValueProcessorDelegate) implClass.newInstance();
} catch (final Exception e) {
throw new ExceptionInInitializerError(
new ConfigurationException(
"Environment has been detected to be at least Spring 4, but thymeleaf could not initialize a " +
"delegate of class \"" + SPRING4_DELEGATE_CLASS + "\"", e));
}
} else {
LOGGER.warn(
"[THYMELEAF] You seem to be using the thymeleaf-spring4 module with a Spring version prior to 4.0. " +
"Even though most features should work OK, support for CSRF protection on websites will be " +
"disabled due to incompatibilities between the different versions of the " +
"RequestDataValueProcessor interface in versions 4.x and 3.x.");
spring4Delegate = null;
}
}
public static String processAction(
final ITemplateContext context, final String action, final String httpMethod) {
if (!canApply || !(context instanceof IWebContext)) {
return action;
}
final RequestContext requestContext =
(RequestContext) context.getVariable(SpringContextVariableNames.SPRING_REQUEST_CONTEXT);
if (requestContext == null) {
return action;
}
if (spring4Delegate != null) {
return spring4Delegate.processAction(requestContext, ((IWebContext)context).getRequest(), action, httpMethod);
}
throw new TemplateProcessingException(
"According to the detected Spring version info, a RequestDataValueProcessor delegate should be available, " +
"but none seem applicable");
}
public static String processFormFieldValue(
final ITemplateContext context, final String name, final String value, final String type) {
if (!canApply || !(context instanceof IWebContext)) {
return value;
}
final RequestContext requestContext =
(RequestContext) context.getVariable(SpringContextVariableNames.SPRING_REQUEST_CONTEXT);
if (requestContext == null) {
return value;
}
if (spring4Delegate != null) {
return spring4Delegate.processFormFieldValue(requestContext, ((IWebContext)context).getRequest(), name, value, type);
}
throw new TemplateProcessingException(
"According to the detected Spring version info, a RequestDataValueProcessor delegate should be available, " +
"but none seem applicable");
}
public static Map getExtraHiddenFields(final ITemplateContext context) {
if (!canApply || !(context instanceof IWebContext)) {
return null;
}
final RequestContext requestContext =
(RequestContext) context.getVariable(SpringContextVariableNames.SPRING_REQUEST_CONTEXT);
if (requestContext == null) {
return null;
}
if (spring4Delegate != null) {
return spring4Delegate.getExtraHiddenFields(requestContext, ((IWebContext)context).getRequest());
}
throw new TemplateProcessingException(
"According to the detected Spring version info, a RequestDataValueProcessor delegate should be available, " +
"but none seem applicable");
}
public static String processUrl(final ITemplateContext context, final String url) {
if (!canApply || !(context instanceof IWebContext)) {
return url;
}
final RequestContext requestContext =
(RequestContext) context.getVariable(SpringContextVariableNames.SPRING_REQUEST_CONTEXT);
if (requestContext == null) {
return url;
}
if (spring4Delegate != null) {
return spring4Delegate.processUrl(requestContext, ((IWebContext)context).getRequest(), url);
}
throw new TemplateProcessingException(
"According to the detected Spring version info, a RequestDataValueProcessor delegate should be available, " +
"but none seem applicable");
}
private RequestDataValueProcessorUtils() {
super();
}
}