Java tutorial
/* * This library is part of OpenCms - * the Open Source Content Management System * * Copyright (c) Alkacon Software GmbH & Co. KG (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, 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.main; import org.opencms.ade.detailpage.CmsDetailPageResourceHandler; import org.opencms.db.CmsAlias; import org.opencms.db.CmsRewriteAliasMatcher; import org.opencms.file.CmsObject; import org.opencms.file.CmsResource; import org.opencms.gwt.shared.alias.CmsAliasMode; import org.opencms.i18n.CmsMessageContainer; import org.opencms.security.CmsPermissionViolationException; import org.opencms.security.CmsSecurityException; import org.opencms.util.CmsFileUtil; import org.opencms.workplace.CmsWorkplace; import java.io.IOException; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; /** * Resource init handler for detail-pages.<p> * * @since 8.0.0 */ public class CmsAliasResourceHandler implements I_CmsResourceInit { /** The attribute containing the detail content resource. */ public static final String ATTR_DETAIL_CONTENT_RESOURCE = "__opencms_detail_content_resource"; /** The log object for this class. */ private static final Log LOG = CmsLog.getLog(CmsDetailPageResourceHandler.class); /** * Default constructor.<p> */ public CmsAliasResourceHandler() { // empty } /** * @see org.opencms.main.I_CmsResourceInit#initResource(org.opencms.file.CmsResource, org.opencms.file.CmsObject, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse) */ public CmsResource initResource(CmsResource resource, CmsObject cms, HttpServletRequest req, HttpServletResponse res) throws CmsResourceInitException, CmsSecurityException { // check if the resource was already found or the path starts with '/system/' boolean abort = (resource != null) || cms.getRequestContext().getUri().startsWith(CmsWorkplace.VFS_PATH_SYSTEM); if (abort) { // skip in all cases above return resource; } String path = cms.getRequestContext().getUri(); path = CmsFileUtil.removeTrailingSeparator(path); String siteRoot = cms.getRequestContext().getSiteRoot(); if ("".equals(siteRoot)) { siteRoot = OpenCms.getSiteManager().getSiteRoot(path); if (siteRoot == null) { siteRoot = ""; } } try { String sitePath = path; String oldSiteRoot = cms.getRequestContext().getSiteRoot(); try { cms.getRequestContext().setSiteRoot(siteRoot); sitePath = cms.getRequestContext().removeSiteRoot(path); } finally { cms.getRequestContext().setSiteRoot(oldSiteRoot); } CmsRewriteAliasMatcher rewriteAliases = OpenCms.getAliasManager().getRewriteAliasMatcher(cms, siteRoot); CmsRewriteAliasMatcher.RewriteResult rewriteResult = rewriteAliases.match(sitePath); if ((rewriteResult != null) && (res != null)) { String link = OpenCms.getLinkManager().substituteLink(cms, rewriteResult.getNewPath()); if (rewriteResult.getAlias().getMode().isRedirect()) { redirectToTarget(req, res, link, rewriteResult.getAlias().getMode() == CmsAliasMode.permanentRedirect); } else { cms.getRequestContext().setUri(rewriteResult.getNewPath()); } return null; } List<CmsAlias> aliases = OpenCms.getAliasManager().getAliasesForPath(cms, siteRoot, sitePath); assert aliases.size() < 2; if (aliases.size() == 1) { CmsAlias alias = aliases.get(0); CmsResource aliasTarget = cms.readResource(alias.getStructureId()); if (alias.isRedirect()) { String link = OpenCms.getLinkManager().substituteLink(cms, aliasTarget); boolean isPermanent = alias.isPermanentRedirect(); // response may be null if we're coming from the locale manager redirectToTarget(req, res, link, isPermanent); } else { // not a redirect, just proceed with the aliased resource cms.getRequestContext().setUri(cms.getSitePath(aliasTarget)); return aliasTarget; } } } catch (CmsPermissionViolationException e) { // trigger the permission denied handler throw e; } catch (CmsResourceInitException e) { // just rethrow so the catch(Throwable e) code isn't executed throw e; } catch (Throwable e) { String uri = cms.getRequestContext().getUri(); CmsMessageContainer msg = org.opencms.ade.detailpage.Messages.get() .container(org.opencms.ade.detailpage.Messages.ERR_RESCOURCE_NOT_FOUND_1, uri); LOG.error(e.getLocalizedMessage(), e); throw new CmsResourceInitException(msg, e); } return null; } /** * Helper method for sending a redirect to a new URI.<p> * * @param req the current request * @param res the current response * @param link the redirect target * @param isPermanent if true, sends a 'moved permanently' redirect * * @throws IOException * @throws CmsResourceInitException */ private void redirectToTarget(HttpServletRequest req, HttpServletResponse res, String link, boolean isPermanent) throws IOException, CmsResourceInitException { CmsResourceInitException resInitException = new CmsResourceInitException(getClass()); if (res != null) { // preserve request parameters for the redirect String query = req.getQueryString(); if (query != null) { link += "?" + query; } // disable 404 handler resInitException.setClearErrors(true); if (isPermanent) { res.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY); res.setHeader("Location", link); } else { res.sendRedirect(link); } } throw resInitException; } }