/*
* Copyright (c) 2002-2012 Alibaba Group Holding Limited.
* All rights reserved.
*
* 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 com.alibaba.citrus.turbine.pipeline.valve;
import static com.alibaba.citrus.springext.util.SpringExtUtil.*;
import static com.alibaba.citrus.turbine.util.TurbineUtil.*;
import static com.alibaba.citrus.util.ObjectUtil.*;
import static com.alibaba.citrus.util.StringUtil.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URLConnection;
import javax.servlet.http.HttpServletRequest;
import com.alibaba.citrus.service.pipeline.PipelineContext;
import com.alibaba.citrus.service.pipeline.PipelineException;
import com.alibaba.citrus.service.pipeline.support.AbstractValve;
import com.alibaba.citrus.service.pipeline.support.AbstractValveDefinitionParser;
import com.alibaba.citrus.service.requestcontext.buffered.BufferedRequestContext;
import com.alibaba.citrus.turbine.TurbineRunData;
import com.alibaba.citrus.util.ServletUtil;
import com.alibaba.citrus.util.io.StreamUtil;
import com.alibaba.citrus.util.regex.Substitution;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.w3c.dom.Element;
/**
* 从resource loader中装载资源，并直接显示的valve。
*
* @author Michael Zhou
*/
public class GetResourceValve extends AbstractValve implements ResourceLoaderAware {
private static final String DEFAULT_SUBSTITUTION_NAME = "subst";
@Autowired
private HttpServletRequest request;
@Autowired
private BufferedRequestContext bufferedRequestContext;
private ResourceLoader loader;
private String substName;
private String resourceName;
public void setResourceLoader(ResourceLoader resourceLoader) {
this.loader = resourceLoader;
}
/**
* 在<code>PipelineContext</code>中的<code>Substitution</code>的名称，默认为
* <code>subst</code>。
* <p>
* 这个substitution对象通常是由某个condition匹配后放到context中的。
* </p>
*/
public void setSubst(String substName) {
this.substName = trimToNull(substName);
}
/** 设置resource名称，可以包含<code>$1</code>、<code>$2</code>这样的替换符。 */
public void setName(String resourceName) {
this.resourceName = trimToNull(resourceName);
}
@Override
protected void init() throws Exception {
substName = defaultIfNull(substName, DEFAULT_SUBSTITUTION_NAME);
}
public void invoke(PipelineContext pipelineContext) throws Exception {
TurbineRunData rundata = getTurbineRunData(request);
Substitution subst = getSubstitution(pipelineContext);
String resourceName;
if (subst != null && this.resourceName != null) {
resourceName = trimToNull(subst.substitute(this.resourceName));
} else {
resourceName = ServletUtil.getResourcePath(rundata.getRequest());
}
try {
resourceName = URI.create(resourceName).normalize().toString();
if (resourceName.contains("../")) {
resourceName = null;
}
} catch (IllegalArgumentException e) {
resourceName = null;
}
Resource resource = null;
if (resourceName != null) {
resource = loader.getResource(resourceName);
}
if (resource == null || !resource.exists()) {
throw new com.alibaba.citrus.webx.ResourceNotFoundException("Could not find resource: " + resourceName);
}
InputStream istream = null;
OutputStream ostream = null;
try {
URLConnection connection = resource.getURL().openConnection();
String contentType = connection.getContentType();
if (contentType != null) {
rundata.getResponse().setContentType(contentType);
}
istream = connection.getInputStream();
// 现在已经取得输入流，开始输出。
bufferedRequestContext.setBuffering(false);
ostream = rundata.getResponse().getOutputStream();
StreamUtil.io(istream, ostream, true, false);
} catch (IOException e) {
throw new PipelineException("Failed reading resource: " + resource);
} finally {
if (ostream != null) {
try {
ostream.flush();
} catch (IOException e) {
}
}
}
pipelineContext.invokeNext();
}
private Substitution getSubstitution(PipelineContext pipelineContext) {
return (Substitution) pipelineContext.getAttribute(substName);
}
public static class DefinitionParser extends AbstractValveDefinitionParser<GetResourceValve> {
@Override
protected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {
attributesToProperties(element, builder, "subst", "name");
}
}
}