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1   /**
2    * This file Copyright (c) 2008-2013 Magnolia International
3    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
4    *
5    *
6    * This file is dual-licensed under both the Magnolia
7    * Network Agreement and the GNU General Public License.
8    * You may elect to use one or the other of these licenses.
9    *
10   * This file is distributed in the hope that it will be
11   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12   * implied warranty of MERCHANTABILITY or FITNESS FOR A
13   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14   * Redistribution, except as permitted by whichever of the GPL
15   * or MNA you select, is prohibited.
16   *
17   * 1. For the GPL license (GPL), you can redistribute and/or
18   * modify this file under the terms of the GNU General
19   * Public License, Version 3, as published by the Free Software
20   * Foundation.  You should have received a copy of the GNU
21   * General Public License, Version 3 along with this program;
22   * if not, write to the Free Software Foundation, Inc., 51
23   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24   *
25   * 2. For the Magnolia Network Agreement (MNA), this file
26   * and the accompanying materials are made available under the
27   * terms of the MNA which accompanies this distribution, and
28   * is available at http://www.magnolia-cms.com/mna.html
29   *
30   * Any modifications to this file must keep this entire header
31   * intact.
32   *
33   */
34  package info.magnolia.rendering.renderer;
35  
36  import info.magnolia.cms.core.AggregationState;
37  import info.magnolia.context.MgnlContext;
38  import info.magnolia.jcr.decoration.ContentDecoratorUtil;
39  import info.magnolia.jcr.util.ContentMap;
40  import info.magnolia.jcr.util.NodeUtil;
41  import info.magnolia.jcr.wrapper.ChannelVisibilityContentDecorator;
42  import info.magnolia.jcr.wrapper.HTMLEscapingNodeWrapper;
43  import info.magnolia.jcr.wrapper.I18nNodeWrapper;
44  import info.magnolia.objectfactory.Components;
45  import info.magnolia.objectfactory.MgnlInstantiationException;
46  import info.magnolia.objectfactory.ParameterInfo;
47  import info.magnolia.objectfactory.ParameterResolver;
48  import info.magnolia.rendering.context.RenderingContext;
49  import info.magnolia.rendering.engine.RenderException;
50  import info.magnolia.rendering.model.EarlyExecutionAware;
51  import info.magnolia.rendering.model.ModelExecutionFilter;
52  import info.magnolia.rendering.model.RenderingModel;
53  import info.magnolia.rendering.model.RenderingModelImpl;
54  import info.magnolia.rendering.template.RenderableDefinition;
55  
56  import java.lang.reflect.InvocationTargetException;
57  import java.util.HashMap;
58  import java.util.Map;
59  import java.util.Map.Entry;
60  
61  import javax.jcr.Node;
62  import javax.jcr.RepositoryException;
63  
64  import org.apache.commons.beanutils.BeanUtils;
65  import org.apache.commons.lang.StringUtils;
66  import org.apache.commons.lang.exception.ExceptionUtils;
67  
68  
69  /**
70   * Abstract renderer with support for typical functionality such as setting context attributes and executing a
71   * rendering model. Sets up the context by providing the following objects:
72   * <ul>
73   *     <li>content</li>
74   *     <li>def</li>
75   *     <li>state</li>
76   *     <li>model</li>
77   *     <li>actionResult</li>
78   * </ul>
79   *
80   * @version $Id$
81   */
82  public abstract class AbstractRenderer implements Renderer, RenderingModelBasedRenderer {
83  
84      protected static final String MODEL_ATTRIBUTE = RenderingModel.class.getName();
85  
86      private Map<String, ContextAttributeConfiguration> contextAttributes = new HashMap<String, ContextAttributeConfiguration>();
87  
88      @Override
89      public void render(RenderingContext renderingCtx, Map<String, Object> contextObjects) throws RenderException {
90  
91          final RenderingModel<?> parentModel = MgnlContext.getAttribute(MODEL_ATTRIBUTE);
92          Node content = renderingCtx.getCurrentContent();
93          RenderableDefinition definition = renderingCtx.getRenderableDefinition();
94  
95          RenderingModel<?> model = null;
96          String actionResult = null;
97  
98          if (content != null) {
99              String uuid;
100             try {
101                 uuid = content.getIdentifier();
102             }
103             catch (RepositoryException e) {
104                 throw new RenderException(e);
105             }
106 
107             model = MgnlContext.getAttribute(ModelExecutionFilter.MODEL_ATTRIBUTE_PREFIX + uuid);
108             if (model != null) {
109                 actionResult = (String) MgnlContext.getAttribute(ModelExecutionFilter.ACTION_RESULT_ATTRIBUTE_PREFIX + uuid);
110                 if (model instanceof EarlyExecutionAware) {
111                     ((EarlyExecutionAware)model).setParent(parentModel);
112                 }
113             }
114         }
115 
116         if (model == null) {
117             model = newModel(content, definition, parentModel);
118             if (model != null) {
119                 actionResult = model.execute();
120                 if (RenderingModel.SKIP_RENDERING.equals(actionResult)) {
121                     return;
122                 }
123             }
124         }
125 
126         String templatePath = resolveTemplateScript(content, definition, model, actionResult);
127         if(templatePath == null){
128             throw new RenderException("No template script defined for the template definition [" + definition + "]");
129         }
130 
131         final Map<String, Object> ctx = newContext();
132         final Map<String, Object> savedContextState = saveContextState(ctx);
133         setupContext(ctx, content, definition, model, actionResult);
134         ctx.putAll(contextObjects);
135         MgnlContext.setAttribute(MODEL_ATTRIBUTE, model);
136         content = wrapNodeForModel(content);
137         renderingCtx.push(content, definition);
138         try {
139             onRender(content, definition, renderingCtx, ctx, templatePath);
140         } finally {
141             renderingCtx.pop();
142         }
143         MgnlContext.setAttribute(MODEL_ATTRIBUTE, parentModel);
144 
145         restoreContext(ctx, savedContextState);
146     }
147 
148     /**
149      * Hook-method to be overriden when required. Default implementation ignores all arguments except definition.
150      *
151      * @param definition reference templateScript is retrieved from
152      *
153      * @return the templateScript to use
154      */
155     protected String resolveTemplateScript(Node content, RenderableDefinition definition, RenderingModel<?> model, final String actionResult) {
156         return definition.getTemplateScript();
157     }
158 
159     /**
160      * Instantiates the model based on the class defined by the
161      * {@link info.magnolia.rendering.template.RenderableDefinition#getModelClass()} property. All the request
162      * parameters are then mapped to the model's properties.
163      */
164     @Override
165     public RenderingModel<?> newModel(final Node content, final RenderableDefinition definition, final RenderingModel<?> parentModel) throws RenderException {
166 
167         Class clazz = definition.getModelClass();
168 
169         // if none is set we default to RenderingModelImpl, so there will always be a model available in templates
170         if (clazz == null) {
171             clazz = RenderingModelImpl.class;
172         }
173 
174         final Node wrappedContent = wrapNodeForModel(content);
175 
176         return newModel(clazz, wrappedContent, definition, parentModel);
177     }
178 
179     protected <T extends RenderingModel<?>> T newModel(Class<T> modelClass, final Node content, final RenderableDefinition definition, final RenderingModel<?> parentModel) throws RenderException {
180 
181         try {
182 
183             T model = Components.getComponentProvider().newInstanceWithParameterResolvers(modelClass,
184                     new ParameterResolver() {
185                         @Override
186                         public Object resolveParameter(ParameterInfo parameter) {
187                             if (parameter.getParameterType().equals(Node.class)) {
188                                 return content;
189                             }
190                             if (parameter.getParameterType().isAssignableFrom(definition.getClass())) {
191                                 return definition;
192                             }
193                             if (parameter.getParameterType().equals(RenderingModel.class)) {
194                                 return parentModel;
195                             }
196                             return UNRESOLVED;
197                         }
198                     }
199             );
200 
201             // populate the instance with values given as request parameters
202             Map<String, String[]> params = MgnlContext.getWebContext().getRequest().getParameterMap();
203             // needed workaround to not break rendering when there is no index between square brackets
204             // see https://issues.apache.org/jira/browse/BEANUTILS-419
205             Map<String, Object> filtered = new HashMap<String, Object>();
206             if (params != null) {
207                 for (Entry<String, String[]> entry : params.entrySet()) {
208                     String key = entry.getKey();
209                     String[] value = entry.getValue();
210                     if (StringUtils.contains(key, "[")) {
211                         key = StringUtils.substringBefore(key, "[");
212                     }
213                     filtered.put(key, value);
214                 }
215             }
216 
217             BeanUtils.populate(model, filtered);
218 
219             return model;
220 
221         } catch (MgnlInstantiationException e) {
222             throw new RenderException("Can't instantiate model: " + modelClass, e);
223         } catch (InvocationTargetException e) {
224             throw new RenderException("Can't create rendering model: " + ExceptionUtils.getRootCauseMessage(e), e);
225         } catch (IllegalAccessException e) {
226             throw new RenderException("Can't create rendering model: " + ExceptionUtils.getRootCauseMessage(e), e);
227         }
228     }
229 
230     protected Map<String, Object> saveContextState(final Map<String, Object> ctx) {
231         Map<String, Object> state = new HashMap<String, Object>();
232         // save former values
233         saveAttribute(ctx, state, "content");
234         saveAttribute(ctx, state, "def");
235         saveAttribute(ctx, state, "state");
236         saveAttribute(ctx, state, "model");
237         saveAttribute(ctx, state, "actionResult");
238 
239         return state;
240     }
241 
242     protected void saveAttribute(final Map<String, Object> ctx, Map<String, Object> state, String name) {
243         state.put(name, ctx.get(name));
244     }
245 
246     protected void restoreContext(final Map<String, Object> ctx, Map<String, Object> state) {
247         for (Entry<String, Object> entry : state.entrySet()) {
248             setContextAttribute(ctx, entry.getKey(), entry.getValue());
249         }
250     }
251 
252     protected void setupContext(final Map<String, Object> ctx, Node content, RenderableDefinition definition, RenderingModel<?> model, Object actionResult){
253         final Node mainContent = getMainContentSafely(content);
254 
255         setContextAttribute(ctx, "content", content != null ? new ContentMap(wrapNodeForTemplate(content)) : null);
256         setContextAttribute(ctx, "def", definition);
257         setContextAttribute(ctx, "state", getAggregationStateSafely());
258         setContextAttribute(ctx, "model", model);
259         setContextAttribute(ctx, "actionResult", actionResult);
260 
261         for (Entry<String, ContextAttributeConfiguration> entry : contextAttributes.entrySet()) {
262             setContextAttribute(ctx, entry.getKey(), Components.getComponent(entry.getValue().getComponentClass()));
263         }
264 
265     }
266 
267     /**
268      * Gets the current main content or returns null if aggregation state is not set.
269      */
270     protected Node getMainContentSafely(Node content) {
271         AggregationState state = getAggregationStateSafely();
272         return state == null ? content : state.getMainContentNode();
273     }
274 
275     /**
276      * This gets the aggregation state without throwing an exception if the current context is not a WebContext.
277      */
278     protected AggregationState getAggregationStateSafely() {
279         if(MgnlContext.isWebContext()){
280             return MgnlContext.getAggregationState();
281         }
282         return null;
283     }
284 
285     /**
286      * Wraps the current content node before passing it to the model.
287      * @param content the actual content
288      * @return the wrapped content
289      */
290     protected Node wrapNodeForModel(Node content) {
291         NodeUtil.deepUnwrap(content, HTMLEscapingNodeWrapper.class);
292         content = wrapWithChannelVisibilityWrapper(content);
293         content = wrapWithI18NWrapper(content);
294         return content;
295     }
296 
297     /**
298      * Wraps the current content node for exposing it to the template script as a context attribute.
299      *
300      * @param content the actual content
301      * @return the wrapped content
302      */
303     protected Node wrapNodeForTemplate(Node content) {
304         content = wrapWithChannelVisibilityWrapper(content);
305         content = wrapWithI18NWrapper(content);
306         content = wrapWithHTMLEscapingWrapper(content);
307         return content;
308     }
309 
310     private Node wrapWithHTMLEscapingWrapper(Node content) {
311         if(!NodeUtil.isWrappedWith(content, HTMLEscapingNodeWrapper.class)){
312             content = new HTMLEscapingNodeWrapper(content, true);
313         }
314         return content;
315     }
316 
317     private Node wrapWithI18NWrapper(Node content) {
318         if(!NodeUtil.isWrappedWith(content, I18nNodeWrapper.class)){
319             content = new I18nNodeWrapper(content);
320         }
321         return content;
322     }
323 
324     private Node wrapWithChannelVisibilityWrapper(Node content) {
325         // If it's already wrapped then we don't need to add a new one
326         if (ContentDecoratorUtil.isDecoratedWith(content, ChannelVisibilityContentDecorator.class)) {
327             return content;
328         }
329         AggregationState aggregationState = getAggregationStateSafely();
330         if (aggregationState == null) {
331             return content;
332         }
333         String channel = aggregationState.getChannel().getName();
334         if (StringUtils.isEmpty(channel) || channel.equalsIgnoreCase("all")) {
335             return content;
336         }
337         return new ChannelVisibilityContentDecorator(channel).wrapNode(content);
338     }
339 
340     protected Object setContextAttribute(final Map<String, Object> ctx, final String name, Object value) {
341         return ctx.put(name, value);
342     }
343 
344     public Map<String, ContextAttributeConfiguration> getContextAttributes() {
345         return contextAttributes;
346     }
347 
348     public void setContextAttributes(Map<String, ContextAttributeConfiguration> contextAttributes) {
349         if(this.contextAttributes!=null) {
350             this.contextAttributes.putAll(contextAttributes);
351         } else {
352             this.contextAttributes = contextAttributes;
353         }
354     }
355 
356     public void addContextAttribute(String name, ContextAttributeConfiguration contextAttributeConfiguration){
357         this.contextAttributes.put(name, contextAttributeConfiguration);
358     }
359 
360     /**
361      * Create a new context object which is a map.
362      */
363     protected abstract Map<String, Object> newContext();
364 
365     /**
366      * Finally execute the rendering.
367      */
368     protected abstract void onRender(Node content, RenderableDefinition definition, RenderingContext renderingCtx, Map<String, Object> ctx, String templateScript) throws RenderException;
369 
370 }