001/* 002 * (C) Copyright 2012 Nuxeo SAS (http://nuxeo.com/) and contributors. 003 * 004 * All rights reserved. This program and the accompanying materials 005 * are made available under the terms of the GNU Lesser General Public License 006 * (LGPL) version 2.1 which accompanies this distribution, and is available at 007 * http://www.gnu.org/licenses/lgpl.html 008 * 009 * This library is distributed in the hope that it will be useful, 010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 012 * Lesser General Public License for more details. 013 * Contributors: 014 * Nuxeo - initial API and implementation 015 */ 016 017package org.nuxeo.ecm.platform.rendition.url; 018 019import java.io.IOException; 020import java.io.Serializable; 021import java.util.Collections; 022import java.util.Map; 023 024import javax.faces.context.FacesContext; 025import javax.servlet.http.HttpServletRequest; 026import javax.servlet.http.HttpServletResponse; 027 028import org.apache.commons.logging.Log; 029import org.apache.commons.logging.LogFactory; 030import org.jboss.seam.annotations.Begin; 031import org.jboss.seam.annotations.In; 032import org.jboss.seam.faces.FacesMessages; 033import org.jboss.seam.international.StatusMessage; 034import org.nuxeo.ecm.core.api.Blob; 035import org.nuxeo.ecm.core.api.CoreSession; 036import org.nuxeo.ecm.core.api.DocumentLocation; 037import org.nuxeo.ecm.core.api.DocumentModel; 038import org.nuxeo.ecm.core.api.NuxeoException; 039import org.nuxeo.ecm.platform.ui.web.api.NavigationContext; 040import org.nuxeo.ecm.platform.ui.web.tag.fn.DocumentModelFunctions; 041import org.nuxeo.ecm.platform.ui.web.util.ComponentUtils; 042import org.nuxeo.ecm.platform.url.api.DocumentView; 043import org.nuxeo.ecm.platform.util.RepositoryLocation; 044 045/** 046 * Base class for Rendition url codec bindings. 047 * <p> 048 * This class is shared with Template rendering system. 049 * 050 * @since 5.6 051 * @author <a href="mailto:tdelprat@nuxeo.com">Tiry</a> 052 */ 053public abstract class AbstractRenditionRestHelper implements Serializable { 054 055 private static final long serialVersionUID = 1L; 056 057 protected static final Log log = LogFactory.getLog(AbstractRenditionRestHelper.class); 058 059 @In(create = true, required = false) 060 protected transient CoreSession documentManager; 061 062 @In(create = true) 063 protected transient NavigationContext navigationContext; 064 065 @In(create = true, required = false) 066 protected FacesMessages facesMessages; 067 068 @In(create = true) 069 protected Map<String, String> messages; 070 071 protected abstract Blob renderAsBlob(DocumentModel doc, String renditionName) throws Exception; 072 073 @Begin(id = "#{conversationIdGenerator.nextMainConversationId}", join = true) 074 public void render(DocumentView docView) throws Exception { 075 076 DocumentLocation docLoc = docView.getDocumentLocation(); 077 if (documentManager == null) { 078 RepositoryLocation loc = new RepositoryLocation(docLoc.getServerName()); 079 navigationContext.setCurrentServerLocation(loc); 080 documentManager = navigationContext.getOrCreateDocumentManager(); 081 } 082 DocumentModel doc = documentManager.getDocument(docLoc.getDocRef()); 083 if (doc != null) { 084 String renditionName = docView.getParameter(RenditionBasedCodec.RENDITION_PARAM_NAME); 085 FacesContext context = FacesContext.getCurrentInstance(); 086 Blob rendered = null; 087 try { 088 rendered = renderAsBlob(doc, renditionName); 089 } catch (NuxeoException e) { 090 log.error("Unable to generate rendition " + renditionName, e); 091 facesMessages.add(StatusMessage.Severity.WARN, messages.get("rendition.not.available"), renditionName); 092 // now we need to redirect 093 // otherwise the page will be rendered via Seam PDF 094 HttpServletRequest req = (HttpServletRequest) context.getExternalContext().getRequest(); 095 String url = DocumentModelFunctions.documentUrl(doc, req); 096 097 HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse(); 098 try { 099 response.sendRedirect(url); 100 // be sure we block the codec chain 101 response.flushBuffer(); 102 FacesContext.getCurrentInstance().responseComplete(); 103 } catch (IOException ioe) { 104 log.error("Error while redirecting to standard view", ioe); 105 } 106 return; 107 } 108 if (rendered != null) { 109 if (rendered.getMimeType() != null && rendered.getMimeType().startsWith("text/")) { 110 HttpServletRequest request = (HttpServletRequest) context.getExternalContext().getRequest(); 111 // add inline download flag 112 request.setAttribute("inline", "true"); 113 } 114 ComponentUtils.download(doc, null, rendered, rendered.getFilename(), "rendition", 115 Collections.singletonMap("rendition", renditionName)); 116 } else { 117 HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse(); 118 response.sendError(404, "Unable to find rendition " + renditionName); 119 } 120 } 121 } 122 123}