Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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. * * Contributors: * Florent Guillaume */ package org.nuxeo.ecm.core.opencmis.bindings; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.chemistry.opencmis.server.impl.atompub.AbstractAtomPubServiceCall; import org.apache.chemistry.opencmis.server.impl.atompub.CmisAtomPubServlet; import org.apache.chemistry.opencmis.server.shared.Dispatcher; import org.apache.chemistry.opencmis.server.shared.ExceptionHelper; import org.apache.commons.lang.StringEscapeUtils; import org.apache.commons.lang.StringUtils; import org.nuxeo.ecm.core.opencmis.bindings.NuxeoCmisErrorHelper.ErrorInfo; import org.nuxeo.ecm.platform.web.common.vh.VirtualHostHelper; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Subclass CmisAtomPubServlet to inject a virtual-hosted base URL if needed. */ public class NuxeoCmisAtomPubServlet extends CmisAtomPubServlet { private static final long serialVersionUID = 1L; private static final Logger LOG = LoggerFactory.getLogger(NuxeoCmisAtomPubServlet.class); @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String baseUrl = VirtualHostHelper.getBaseURL(request); if (baseUrl != null) { baseUrl = StringUtils.stripEnd(baseUrl, "/") + request.getServletPath() + "/" + AbstractAtomPubServiceCall.REPOSITORY_PLACEHOLDER + "/"; request.setAttribute(Dispatcher.BASE_URL_ATTRIBUTE, baseUrl); } super.service(request, response); } /** * Extracts the error from the exception. * * @param ex the exception * @return the error info * @since 7.1 */ protected ErrorInfo extractError(Exception ex) { return NuxeoCmisErrorHelper.extractError(ex); } @Override protected void printError(Exception ex, HttpServletResponse response) { ErrorInfo errorInfo = extractError(ex); if (response.isCommitted()) { LOG.warn("Failed to send error message to client. " + "Response is already committed.", ex); return; } try { response.resetBuffer(); response.setStatus(errorInfo.statusCode); response.setContentType("text/html"); response.setCharacterEncoding("UTF-8"); PrintWriter pw = response.getWriter(); pw.print("<html><head><title>Apache Chemistry OpenCMIS - " + errorInfo.exceptionName + " error</title>" + "<style><!--H1 {font-size:24px;line-height:normal;font-weight:bold;background-color:#f0f0f0;color:#003366;border-bottom:1px solid #3c78b5;padding:2px;} " + "BODY {font-family:Verdana,arial,sans-serif;color:black;font-size:14px;} " + "HR {color:#3c78b5;height:1px;}--></style></head><body>"); pw.print("<h1>HTTP Status " + errorInfo.statusCode + " - <!--exception-->" + errorInfo.exceptionName + "<!--/exception--></h1>"); pw.print("<p><!--message-->" + StringEscapeUtils.escapeHtml(errorInfo.message) + "<!--/message--></p>"); String st = ExceptionHelper.getStacktraceAsString(ex); if (st != null) { pw.print("<hr noshade='noshade'/><!--stacktrace--><pre>\n" + st + "\n</pre><!--/stacktrace--><hr noshade='noshade'/>"); } pw.print("</body></html>"); } catch (Exception e) { LOG.error(e.getMessage(), e); try { response.sendError(errorInfo.statusCode, errorInfo.message); } catch (Exception en) { // there is nothing else we can do } } } }