/*
* 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.
*/
package org.apache.sling.scripting.freemarker;
import java.io.Reader;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptException;
import javax.jcr.Node;
import freemarker.log.Logger;
import org.apache.sling.api.scripting.SlingBindings;
import org.apache.sling.api.scripting.SlingScriptHelper;
import org.apache.sling.scripting.api.AbstractSlingScriptEngine;
import org.apache.sling.scripting.freemarker.wrapper.NodeModel;
import freemarker.template.Configuration;
import freemarker.template.Template;
/**
* A ScriptEngine that uses <a href="http://freemarker.org/">FreeMarker</a> templates
* to render a Resource in HTML.
*/
public class FreemarkerScriptEngine extends AbstractSlingScriptEngine {
private static final Logger log = Logger.getLogger(FreemarkerScriptEngine.class.getName());
private final Configuration configuration;
public FreemarkerScriptEngine(ScriptEngineFactory factory) {
super(factory);
configuration = new Configuration();
}
public Object eval(Reader reader, ScriptContext scriptContext)
throws ScriptException {
Bindings bindings = scriptContext.getBindings(ScriptContext.ENGINE_SCOPE);
SlingScriptHelper helper = (SlingScriptHelper) bindings.get(SlingBindings.SLING);
if (helper == null) {
throw new ScriptException("SlingScriptHelper missing from bindings");
}
// ensure GET request
if (!"GET".equals(helper.getRequest().getMethod())) {
throw new ScriptException(
"FreeMarker templates only support GET requests");
}
String scriptName = helper.getScript().getScriptResource().getPath();
try {
Template tmpl = new Template(scriptName, reader, configuration);
bindings.put("currentNode", new NodeModel((Node) bindings.get("currentNode")));
tmpl.process(bindings, scriptContext.getWriter());
} catch (Throwable t) {
log.error("Failure running Freemarker script.", t);
throw new ScriptException("Failure running FreeMarker script "
+ scriptName);
}
return null;
}
}