001 package org.apache.myfaces.tobago.ajax.api; 002 003 /* 004 * Licensed to the Apache Software Foundation (ASF) under one or more 005 * contributor license agreements. See the NOTICE file distributed with 006 * this work for additional information regarding copyright ownership. 007 * The ASF licenses this file to You under the Apache License, Version 2.0 008 * (the "License"); you may not use this file except in compliance with 009 * the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, software 014 * distributed under the License is distributed on an "AS IS" BASIS, 015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 016 * See the License for the specific language governing permissions and 017 * limitations under the License. 018 */ 019 020 import org.apache.commons.lang.StringUtils; 021 import org.apache.commons.logging.Log; 022 import org.apache.commons.logging.LogFactory; 023 import static org.apache.myfaces.tobago.TobagoConstants.ATTR_CHARSET; 024 import org.apache.myfaces.tobago.component.ComponentUtil; 025 import static org.apache.myfaces.tobago.lifecycle.TobagoLifecycle.FACES_MESSAGES_KEY; 026 import static org.apache.myfaces.tobago.lifecycle.TobagoLifecycle.VIEW_ROOT_KEY; 027 import org.apache.myfaces.tobago.renderkit.html.HtmlAttributes; 028 import org.apache.myfaces.tobago.renderkit.html.HtmlConstants; 029 import org.apache.myfaces.tobago.util.Callback; 030 import org.apache.myfaces.tobago.util.EncodeAjaxCallback; 031 import org.apache.myfaces.tobago.util.FastStringWriter; 032 import org.apache.myfaces.tobago.util.RequestUtils; 033 import org.apache.myfaces.tobago.util.ResponseUtils; 034 035 import javax.faces.FactoryFinder; 036 import javax.faces.application.StateManager; 037 import javax.faces.component.UIComponent; 038 import javax.faces.component.UIViewRoot; 039 import javax.faces.context.ExternalContext; 040 import javax.faces.context.FacesContext; 041 import javax.faces.context.ResponseWriter; 042 import javax.faces.render.RenderKit; 043 import javax.faces.render.RenderKitFactory; 044 import javax.naming.Context; 045 import javax.naming.InitialContext; 046 import javax.naming.NamingException; 047 import javax.servlet.http.HttpServletResponse; 048 import java.io.IOException; 049 import java.io.PrintWriter; 050 import java.util.ArrayList; 051 import java.util.EmptyStackException; 052 import java.util.Iterator; 053 import java.util.List; 054 import java.util.Map; 055 056 public class AjaxResponseRenderer { 057 058 private static final Log LOG = LogFactory.getLog(AjaxResponseRenderer.class); 059 060 public static final String CODE_SUCCESS = "<status code=\"200\"/>"; 061 public static final String CODE_NOT_MODIFIED = "<status code=\"304\"/>"; 062 public static final String CODE_RELOAD_REQUIRED = "<status code=\"309\"/>"; 063 064 private Callback callback; 065 private String contentType; 066 067 public AjaxResponseRenderer() { 068 callback = new EncodeAjaxCallback(); 069 try { 070 InitialContext ic = new InitialContext(); 071 Context ctx = (Context) ic.lookup("java:comp/env"); 072 contentType = (String) ctx.lookup("tobago.ajax.contentType"); 073 } catch (NamingException e) { /*ignore*/ } 074 075 if (StringUtils.isBlank(contentType)) { 076 contentType = "text/html"; 077 } 078 } 079 080 public void renderResponse(FacesContext facesContext) throws IOException { 081 final UIViewRoot viewRoot = facesContext.getViewRoot(); 082 RenderKitFactory renderFactory = (RenderKitFactory) 083 FactoryFinder.getFactory(FactoryFinder.RENDER_KIT_FACTORY); 084 RenderKit renderKit = renderFactory.getRenderKit( 085 facesContext, viewRoot.getRenderKitId()); 086 087 UIViewRoot incommingViewRoot = (UIViewRoot) 088 facesContext.getExternalContext().getRequestMap().get(VIEW_ROOT_KEY); 089 if (viewRoot != incommingViewRoot) { 090 if (LOG.isDebugEnabled()) { 091 LOG.debug("requesting full page reload because of navigation to " 092 + viewRoot.getViewId() + " from " + incommingViewRoot.getViewId()); 093 } 094 Map sessionMap = facesContext.getExternalContext().getSessionMap(); 095 //noinspection unchecked 096 sessionMap.put(VIEW_ROOT_KEY, viewRoot); 097 List<Object[]> messageHolders = new ArrayList<Object[]>(); 098 Iterator clientIds = facesContext.getClientIdsWithMessages(); 099 while (clientIds.hasNext()) { 100 String clientId = (String) clientIds.next(); 101 Iterator messages = facesContext.getMessages(clientId); 102 while (messages.hasNext()) { 103 Object[] messageHolder = new Object[2]; 104 messageHolder[0] = clientId; 105 messageHolder[1] = messages.next(); 106 messageHolders.add(messageHolder); 107 } 108 } 109 if (!messageHolders.isEmpty()) { 110 //noinspection unchecked 111 sessionMap.put(FACES_MESSAGES_KEY, messageHolders); 112 } 113 writeResponseReload(facesContext, renderKit); 114 } else { 115 List<FastStringWriter> responseParts = new ArrayList<FastStringWriter>(); 116 Map<String, UIComponent> ajaxComponents = AjaxUtils.getAjaxComponents(facesContext); 117 118 for (Map.Entry<String, UIComponent> entry : ajaxComponents.entrySet()) { 119 AjaxComponent component = (AjaxComponent) entry.getValue(); 120 responseParts.add(renderComponent(facesContext, renderKit, entry.getKey(), component)); 121 break; // TODO render multiple components 122 } 123 124 String state = saveState(facesContext, renderKit); 125 writeResponse(facesContext, renderKit, responseParts, state); 126 } 127 } 128 129 private FastStringWriter renderComponent(FacesContext facesContext, RenderKit renderKit, String clientId, 130 AjaxComponent component) throws IOException { 131 FastStringWriter content = new FastStringWriter(); 132 ResponseWriter contentWriter = renderKit.createResponseWriter(content, null, null); 133 facesContext.setResponseWriter(contentWriter); 134 if (LOG.isDebugEnabled()) { 135 LOG.debug("write ajax response for " + component); 136 } 137 138 try { 139 // TODO: invokeOnComponent() 140 ComponentUtil.invokeOnComponent(facesContext, clientId, (UIComponent) component, callback); 141 } catch (EmptyStackException e) { 142 LOG.error(" content = \"" + content.toString() + "\""); 143 throw e; 144 } 145 146 return content; 147 } 148 149 private void writeResponse(FacesContext facesContext, RenderKit renderKit, 150 List<FastStringWriter> parts, String state) 151 throws IOException { 152 writeResponse(facesContext, renderKit, CODE_SUCCESS, parts, state); 153 } 154 155 private void writeResponseReload(FacesContext facesContext, RenderKit renderKit) 156 throws IOException { 157 writeResponse(facesContext, renderKit, CODE_RELOAD_REQUIRED, new ArrayList<FastStringWriter>(0), ""); 158 } 159 160 161 private FastStringWriter writeState(FacesContext facesContext, RenderKit renderKit, String state) 162 throws IOException { 163 FastStringWriter jsfState = new FastStringWriter(); 164 ResponseWriter stateWriter = renderKit.createResponseWriter(jsfState, null, null); 165 facesContext.setResponseWriter(stateWriter); 166 stateWriter.startElement(HtmlConstants.SCRIPT, null); 167 stateWriter.writeAttribute(HtmlAttributes.TYPE, "text/javascript", null); 168 stateWriter.flush(); 169 stateWriter.write("Tobago.replaceJsfState(\""); 170 stateWriter.write(encodeState(state)); 171 stateWriter.write("\");"); 172 stateWriter.endElement(HtmlConstants.SCRIPT); 173 return jsfState; 174 } 175 176 private String saveState(FacesContext facesContext, RenderKit renderKit) 177 throws IOException { 178 FastStringWriter jsfState = new FastStringWriter(); 179 ResponseWriter stateWriter = renderKit.createResponseWriter(jsfState, null, null); 180 facesContext.setResponseWriter(stateWriter); 181 182 StateManager stateManager = facesContext.getApplication().getStateManager(); 183 StateManager.SerializedView serializedView 184 = stateManager.saveSerializedView(facesContext); 185 stateManager.writeState(facesContext, serializedView); 186 return jsfState.toString(); 187 } 188 189 private static void ensureContentTypeHeader(FacesContext facesContext, String charset, String contentType) { 190 // TODO PortletRequest 191 if (facesContext.getExternalContext().getResponse() instanceof HttpServletResponse) { 192 HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse(); 193 194 StringBuilder sb = new StringBuilder(contentType); 195 if (charset == null) { 196 charset = "UTF-8"; 197 } 198 sb.append("; charset="); 199 sb.append(charset); 200 response.setContentType(sb.toString()); 201 } 202 } 203 204 private void writeResponse(FacesContext facesContext, RenderKit renderKit, 205 String responseCode, List<FastStringWriter> responseParts, String jsfState) 206 throws IOException { 207 ExternalContext externalContext = facesContext.getExternalContext(); 208 RequestUtils.ensureEncoding(externalContext); 209 ResponseUtils.ensureNoCacheHeader(externalContext); 210 UIComponent page = ComponentUtil.findPage(facesContext); 211 String charset; 212 if (page != null) { // in case of CODE_RELOAD_REQUIRED page is null 213 charset = (String) page.getAttributes().get(ATTR_CHARSET); 214 } else { 215 charset = "UTF-8"; 216 } 217 ensureContentTypeHeader(facesContext, charset, contentType); 218 StringBuilder buffer = new StringBuilder(responseCode); 219 220 // add parts to response 221 for (FastStringWriter part : responseParts) { 222 // TODO surround by javascript parsable tokens 223 String partStr = part.toString(); 224 // FIXME: 225 if (partStr.startsWith(CODE_NOT_MODIFIED) 226 && partStr.equals(responseCode)) { 227 // remove resopnseCode from buffer 228 buffer.setLength(0); 229 } 230 // /FIXME: 231 232 buffer.append(partStr); 233 } 234 235 // add jsfState to response 236 if (jsfState.length() > 0) { 237 // in case of inputSuggest jsfState.lenght is 0 238 // inputSuggest is a special case, because the form is not included in request. 239 // TODO surround by javascript parsable token 240 buffer.append(writeState(facesContext, renderKit, jsfState)); 241 } 242 243 if (LOG.isTraceEnabled()) { 244 LOG.trace("\nresponse follows ##############################################################\n" 245 + buffer 246 + "\nend response ##############################################################"); 247 } 248 249 String content = buffer.toString(); 250 251 // TODO optimize me!! 252 buffer.insert(0, Integer.toHexString(content.getBytes("UTF-8").length) + "\r\n"); 253 buffer.append("\r\n" + 0 + "\r\n\r\n"); 254 255 //TODO: fix this to work in PortletRequest as well 256 if (externalContext.getResponse() instanceof HttpServletResponse) { 257 final HttpServletResponse httpServletResponse 258 = (HttpServletResponse) externalContext.getResponse(); 259 httpServletResponse.addHeader("Transfer-Encoding", "chunked"); 260 PrintWriter responseWriter = httpServletResponse.getWriter(); 261 // buf.delete(buf.indexOf("<"), buf.indexOf(">")+1); 262 responseWriter.print(buffer.toString()); 263 responseWriter.flush(); 264 responseWriter.close(); 265 } 266 } 267 268 private String encodeState(String state) { 269 state = StringUtils.replace(state, "\"", "\\\""); 270 return StringUtils.replace(state, "\n", ""); 271 } 272 }