/*
* 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.CmsObject;
import org.opencms.file.CmsResource;
import org.opencms.main.CmsException;
import org.opencms.main.CmsLog;
import org.opencms.main.CmsRuntimeException;
import org.opencms.main.OpenCms;
import org.opencms.util.CmsRequestUtil;
import org.opencms.util.CmsStringUtil;
import java.io.IOException;
import java.util.Locale;
import java.util.Map;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Loader for "pointers" to resources in the VFS or to external resources.<p>
*
* @since 6.0.0
*/
public class CmsPointerLoader extends CmsDumpLoader {
/**
* The configuration parameter for the OpenCms XML configuration to enable
* that the parameters in requests to pointer resources are appended to the
* pointer target link.
*/
public static final String CONFIGURATION_REQUEST_PARAM_SUPPORT_ENABLED = "pointer.requestparamsupport.enabled";
/** The id of this loader. */
public static final int RESOURCE_POINTER_LOADER_ID = 4;
/**
* Flag that controls if parameters in requests to pointer resources are
* appended to the target link when redirecting.
*/
protected static boolean m_requestParamSupportEnabled;
/** The html-code prefix for generating the export file for external links. */
private static String EXPORT_PREFIX = "<html>\n<head>\n<meta http-equiv="
+ '"'
+ "refresh"
+ '"'
+ " content="
+ '"'
+ "0; url=";
/** The html-code suffix for generating the export file for external links. */
private static String EXPORT_SUFFIX = '"' + ">\n</head>\n<body></body>\n</html>";
/**
* The constructor of the class is empty and does nothing.<p>
*/
public CmsPointerLoader() {
// NOOP
}
/**
* Returns <code>true</code> if parameters in requests to pointer resources
* are appended to the target link when redirecting.
* <p>
* This is controlled by the configuration of this loader in
* <code>opencms-system.xml</code>.
* <p>
*
* @return <code>true</code> if parameters in requests to pointer resources
* are appended to the target link when redirecting.
*/
public static boolean isRequestParamSupportEnabled() {
return m_requestParamSupportEnabled;
}
/**
* Internal helper that is used by
* <code>{@link #load(CmsObject, CmsResource, HttpServletRequest, HttpServletResponse)}</code>
* and
* <code>{@link #export(CmsObject, CmsResource, HttpServletRequest, HttpServletResponse)}</code>
* to handle conditional request parameter support for links to pointer
* resources.
* <p>
*
* @param pointerLink
* the link to append request parameters to
*
* @param req
* the original request to the pointer
*
* @return the pointer with the parameters
*/
@SuppressWarnings("unchecked")
private static String appendLinkParams(String pointerLink, HttpServletRequest req) {
String result = pointerLink;
if (isRequestParamSupportEnabled()) {
Map<String, String[]> params = req.getParameterMap();
if (params.size() > 0) {
result = CmsRequestUtil.appendParameters(result, params, false);
}
}
return result;
}
/**
* @see org.opencms.configuration.I_CmsConfigurationParameterHandler#addConfigurationParameter(java.lang.String, java.lang.String)
*/
@Override
public void addConfigurationParameter(String paramName, String paramValue) {
if (CmsStringUtil.isNotEmpty(paramName) && CmsStringUtil.isNotEmpty(paramValue)) {
if (CONFIGURATION_REQUEST_PARAM_SUPPORT_ENABLED.equals(paramName)) {
m_requestParamSupportEnabled = Boolean.valueOf(paramValue).booleanValue();
}
}
}
/**
* Destroy this ResourceLoder, this is a NOOP so far.<p>
*/
@Override
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)
*/
@Override
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)
*/
@Override
public byte[] export(CmsObject cms, CmsResource resource, HttpServletRequest req, HttpServletResponse res)
throws IOException, CmsException {
String pointer = new String(cms.readFile(resource).getContents());
StringBuffer result = new StringBuffer(128);
result.append(EXPORT_PREFIX);
// conditionally append parameters of the current request:
pointer = appendLinkParams(pointer, req);
if (pointer.indexOf(':') < 0) {
result.append(OpenCms.getLinkManager().substituteLink(cms, pointer));
} else {
result.append(pointer);
}
result.append(EXPORT_SUFFIX);
load(cms, resource, req, res);
return result.toString().getBytes(OpenCms.getSystemInfo().getDefaultEncoding());
}
/**
* Will always return <code>null</code> since this loader does not
* need to be cnofigured.<p>
*
* @see org.opencms.configuration.I_CmsConfigurationParameterHandler#getConfiguration()
*/
@Override
public CmsParameterConfiguration getConfiguration() {
CmsParameterConfiguration result = new CmsParameterConfiguration();
CmsParameterConfiguration config = super.getConfiguration();
if (config != null) {
result.putAll(config);
}
result.put(CONFIGURATION_REQUEST_PARAM_SUPPORT_ENABLED, String.valueOf(m_requestParamSupportEnabled));
return result;
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#getLoaderId()
*/
@Override
public int getLoaderId() {
return RESOURCE_POINTER_LOADER_ID;
}
/**
* Return a String describing the ResourceLoader,
* which is (localized to the system default locale)
* <code>"The OpenCms default resource loader for pointers"</code>.<p>
*
* @return a describing String for the ResourceLoader
*/
@Override
public String getResourceLoaderInfo() {
return Messages.get().getBundle().key(Messages.GUI_LOADER_POINTER_DEFAULT_DESC_0);
}
/**
* @see org.opencms.configuration.I_CmsConfigurationParameterHandler#initConfiguration()
*/
@Override
public void initConfiguration() {
if (CmsLog.INIT.isInfoEnabled()) {
CmsLog.INIT.info(Messages.get().getBundle().key(
Messages.INIT_LOADER_INITIALIZED_1,
this.getClass().getName()));
}
}
/**
* Returns true if request parameter support is disabled. <p>
*
* @return
* true if request parameter support is disabled
*
* @see org.opencms.loader.I_CmsResourceLoader#isStaticExportEnabled()
*/
@Override
public boolean isStaticExportEnabled() {
return !m_requestParamSupportEnabled;
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#isStaticExportProcessable()
*/
@Override
public boolean isStaticExportProcessable() {
return false;
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#isUsableForTemplates()
*/
@Override
public boolean isUsableForTemplates() {
return false;
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#isUsingUriWhenLoadingTemplate()
*/
@Override
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)
*/
@Override
public void load(CmsObject cms, CmsResource resource, HttpServletRequest req, HttpServletResponse res)
throws IOException, CmsException {
if ((res == null) || res.isCommitted()) {
// nothing we can do
return;
}
String pointer = new String(cms.readFile(resource).getContents());
if (CmsStringUtil.isEmptyOrWhitespaceOnly(pointer)) {
throw new CmsLoaderException(Messages.get().container(
Messages.ERR_INVALID_POINTER_FILE_1,
resource.getName()));
}
if (pointer.indexOf(':') < 0) {
pointer = OpenCms.getLinkManager().substituteLink(cms, pointer);
}
// conditionally append parameters of the current request:
pointer = appendLinkParams(pointer, req);
res.sendRedirect(pointer);
}
/**
* @see org.opencms.loader.I_CmsResourceLoader#service(org.opencms.file.CmsObject, org.opencms.file.CmsResource, javax.servlet.ServletRequest, javax.servlet.ServletResponse)
*/
@Override
public void service(CmsObject cms, CmsResource file, ServletRequest req, ServletResponse res) {
throw new CmsRuntimeException(
Messages.get().container(Messages.ERR_SERVICE_UNSUPPORTED_1, getClass().getName()));
}
}