/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software GmbH, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.loader;
import org.opencms.configuration.CmsParameterConfiguration;
import org.opencms.file.CmsFile;
import org.opencms.file.CmsObject;
import org.opencms.file.CmsResource;
import org.opencms.flex.CmsFlexController;
import org.opencms.main.CmsException;
import org.opencms.main.CmsLog;
import org.opencms.main.OpenCms;
import org.opencms.util.CmsRequestUtil;
import org.opencms.util.CmsStringUtil;
import org.opencms.workplace.CmsWorkplaceManager;
import java.io.IOException;
import java.util.Iterator;
import java.util.Locale;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Dump loader for binary or other unprocessed resource types.<p>
*
* This loader is also used to deliver static sub-elements of pages processed
* by other loaders.<p>
*
* @since 6.0.0
*/
public class CmsDumpLoader implements I_CmsResourceLoader {
/** The id of this loader. */
public static final int RESOURCE_LOADER_ID = 1;
/** The maximum age for dumped contents in the clients cache. */
private static long m_clientCacheMaxAge;
/** The resource loader configuration. */
private CmsParameterConfiguration m_configuration;
/**
* The constructor of the class is empty and does nothing.<p>
*/
public CmsDumpLoader() {
m_configuration = new CmsParameterConfiguration();
}
/**
* @see org.opencms.configuration.I_CmsConfigurationParameterHandler#addConfigurationParameter(java.lang.String, java.lang.String)
*/
public void addConfigurationParameter(String paramName, String paramValue) {
m_configuration.put(paramName, paramValue);
}
/**
* Destroy this ResourceLoder, this is a NOOP so far.<p>
*/
public void destroy() {
// NOOP
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#dump(org.opencms.file.CmsObject, org.opencms.file.CmsResource, java.lang.String, java.util.Locale, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
public byte[] dump(
CmsObject cms,
CmsResource resource,
String element,
Locale locale,
HttpServletRequest req,
HttpServletResponse res) throws CmsException {
return cms.readFile(resource).getContents();
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#export(org.opencms.file.CmsObject, org.opencms.file.CmsResource, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
public byte[] export(CmsObject cms, CmsResource resource, HttpServletRequest req, HttpServletResponse res)
throws IOException, CmsException {
CmsFile file = cms.readFile(resource);
// if no request and response are given, the resource only must be exported and no
// output must be generated
if ((req != null) && (res != null)) {
// overwrite headers if set as default
for (Iterator<String> i = OpenCms.getStaticExportManager().getExportHeaders().listIterator(); i.hasNext();) {
String header = i.next();
// set header only if format is "key: value"
String[] parts = CmsStringUtil.splitAsArray(header, ':');
if (parts.length == 2) {
res.setHeader(parts[0], parts[1]);
}
}
load(cms, file, req, res);
}
return file.getContents();
}
/**
* Will always return <code>null</code> since this loader does not
* need to be configured.<p>
*
* @see org.opencms.configuration.I_CmsConfigurationParameterHandler#getConfiguration()
*/
public CmsParameterConfiguration getConfiguration() {
// return the configuration in an immutable form
return m_configuration;
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#getLoaderId()
*/
public int getLoaderId() {
return RESOURCE_LOADER_ID;
}
/**
* Return a String describing the ResourceLoader,
* which is (localized to the system default locale)
* <code>"The OpenCms default resource loader for unprocessed files"</code>.<p>
*
* @return a describing String for the ResourceLoader
*/
public String getResourceLoaderInfo() {
return Messages.get().getBundle().key(Messages.GUI_LOADER_DUMB_DEFAULT_DESC_0);
}
/**
* @see org.opencms.configuration.I_CmsConfigurationParameterHandler#initConfiguration()
*/
public void initConfiguration() {
Object maxAge = m_configuration.get("client.cache.maxage");
if (maxAge == null) {
m_clientCacheMaxAge = -1;
} else {
m_clientCacheMaxAge = Long.parseLong(String.valueOf(maxAge));
}
if (CmsLog.INIT.isInfoEnabled()) {
if (maxAge != null) {
CmsLog.INIT.info(Messages.get().getBundle().key(Messages.INIT_CLIENT_CACHE_MAX_AGE_1, maxAge));
}
CmsLog.INIT.info(Messages.get().getBundle().key(
Messages.INIT_LOADER_INITIALIZED_1,
this.getClass().getName()));
}
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#isStaticExportEnabled()
*/
public boolean isStaticExportEnabled() {
return true;
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#isStaticExportProcessable()
*/
public boolean isStaticExportProcessable() {
return false;
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#isUsableForTemplates()
*/
public boolean isUsableForTemplates() {
return false;
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#isUsingUriWhenLoadingTemplate()
*/
public boolean isUsingUriWhenLoadingTemplate() {
return false;
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#load(org.opencms.file.CmsObject, org.opencms.file.CmsResource, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
public void load(CmsObject cms, CmsResource resource, HttpServletRequest req, HttpServletResponse res)
throws IOException, CmsException {
if (canSendLastModifiedHeader(resource, req, res)) {
// no further processing required
return;
}
// make sure we have the file contents available
CmsFile file = cms.readFile(resource);
// set response status to "200 - OK" (required for static export "on-demand")
res.setStatus(HttpServletResponse.SC_OK);
// set content length header
res.setContentLength(file.getContents().length);
if (CmsWorkplaceManager.isWorkplaceUser(req)) {
// prevent caching for Workplace users
res.setDateHeader(CmsRequestUtil.HEADER_LAST_MODIFIED, System.currentTimeMillis());
CmsRequestUtil.setNoCacheHeaders(res);
} else {
// set date last modified header
res.setDateHeader(CmsRequestUtil.HEADER_LAST_MODIFIED, file.getDateLastModified());
// set "Expires" only if cache control is not already set
if (!res.containsHeader(CmsRequestUtil.HEADER_CACHE_CONTROL)) {
long expireTime = resource.getDateExpired();
if (expireTime == CmsResource.DATE_EXPIRED_DEFAULT) {
expireTime--;
// flex controller will automatically reduce this to a reasonable value
}
// now set "Expires" header
CmsFlexController.setDateExpiresHeader(res, expireTime, m_clientCacheMaxAge);
}
}
service(cms, file, req, res);
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#service(org.opencms.file.CmsObject, org.opencms.file.CmsResource, javax.servlet.ServletRequest, javax.servlet.ServletResponse)
*/
public void service(CmsObject cms, CmsResource resource, ServletRequest req, ServletResponse res)
throws CmsException, IOException {
res.getOutputStream().write(cms.readFile(resource).getContents());
}
/**
* Checks if the requested resource must be send to the client by checking the "If-Modified-Since" http header.<p>
*
* If the resource has not been modified, the "304 - not modified"
* header is send to the client and <code>true</code>
* is returned, otherwise nothing is send and <code>false</code> is returned.<p>
*
* @param resource the resource to check
* @param req the current request
* @param res the current response
*
* @return <code>true</code> if the "304 - not modified" header has been send to the client
*/
protected boolean canSendLastModifiedHeader(CmsResource resource, HttpServletRequest req, HttpServletResponse res) {
// resource state must be unchanged
if (resource.getState().isUnchanged()
// the request must not have been send by a workplace user (we can't use "304 - not modified" in workplace
&& !CmsWorkplaceManager.isWorkplaceUser(req)
// last modified header must match the time form the resource
&& CmsFlexController.isNotModifiedSince(req, resource.getDateLastModified())) {
long now = System.currentTimeMillis();
if ((resource.getDateReleased() < now) && (resource.getDateExpired() > now)) {
// resource is available and not expired
CmsFlexController.setDateExpiresHeader(res, resource.getDateExpired(), m_clientCacheMaxAge);
// set status 304 - not modified
res.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
return true;
}
}
return false;
}
}