1 // ========================================================================
2 // Copyright (c) 2009-2010 Intalio, Inc.
3 // ------------------------------------------------------------------------
4 // All rights reserved. This program and the accompanying materials
5 // are made available under the terms of the Eclipse Public License v1.0
6 // and Apache License v2.0 which accompanies this distribution.
7 // The Eclipse Public License is available at
8 // http://www.eclipse.org/legal/epl-v10.html
9 // The Apache License v2.0 is available at
10 // http://www.opensource.org/licenses/apache2.0.php
11 // You may elect to redistribute this code under either of these licenses.
12 // ========================================================================
13 package org.eclipse.jetty.osgi.boot.jasper;
14
15 import java.io.File;
16 import java.io.InputStream;
17 import java.net.URL;
18 import java.util.ArrayList;
19 import java.util.HashSet;
20
21 import javax.servlet.Servlet;
22 import javax.servlet.jsp.JspContext;
23 import javax.servlet.jsp.JspFactory;
24
25 import org.apache.jasper.Constants;
26 import org.apache.jasper.compiler.Localizer;
27 import org.apache.jasper.xmlparser.ParserUtils;
28 import org.eclipse.jetty.osgi.boot.JettyBootstrapActivator;
29 import org.eclipse.jetty.osgi.boot.OSGiAppProvider;
30 import org.eclipse.jetty.osgi.boot.utils.BundleFileLocatorHelper;
31 import org.eclipse.jetty.osgi.boot.utils.WebappRegistrationCustomizer;
32 import org.osgi.framework.Bundle;
33 import org.osgi.framework.FrameworkUtil;
34 import org.xml.sax.EntityResolver;
35 import org.xml.sax.InputSource;
36 import org.xml.sax.SAXException;
37
38 /**
39 * Fix various shortcomings with the way jasper parses the tld files.
40 * Plugs the JSTL tlds assuming that they are packaged with the bundle that contains the JSTL classes.
41 * <p>
42 * Pluggable tlds at the server level are handled by {@link PluggableWebAppRegistrationCustomizerImpl}.
43 * </p>
44 */
45 public class WebappRegistrationCustomizerImpl implements WebappRegistrationCustomizer
46 {
47
48 /**
49 * Default name of a class that belongs to the jstl bundle.
50 * From that class we locate the corresponding bundle and register it
51 * as a bundle that contains tld files.
52 */
53 private static String DEFAULT_JSTL_BUNDLE_CLASS = "org.apache.taglibs.standard.tag.el.core.WhenTag";
54 //used to be "org.apache.jasper.runtime.JspFactoryImpl" but now
55 //the standard tag library implementation are stored in a separate bundle.
56
57 //DISABLED please use the tld bundle argument for the OSGiAppProvider
58 // /**
59 // * Default name of a class that belongs to the bundle where the Java server Faces tld files are defined.
60 // * This is the sun's reference implementation.
61 // */
62 // private static String DEFAUT_JSF_IMPL_CLASS = "com.sun.faces.config.ConfigureListener";
63
64 /**
65 * Default jsp factory implementation.
66 * Idally jasper is osgified and we can use services.
67 * In the mean time we statically set the jsp factory implementation.
68 * bug #299733
69 */
70 private static String DEFAULT_JSP_FACTORY_IMPL_CLASS = "org.apache.jasper.runtime.JspFactoryImpl";
71
72 public WebappRegistrationCustomizerImpl()
73 {
74 fixupDtdResolution();
75
76 try
77 {
78 //sanity check:
79 Class cl = getClass().getClassLoader().loadClass("org.apache.jasper.servlet.JspServlet");
80 //System.err.println("found the jsp servlet: " + cl.getName());
81 }
82 catch (Exception e)
83 {
84 System.err.println("Unable to locate the JspServlet: jsp support unavailable.");
85 e.printStackTrace();
86 return;
87 }
88 try
89 {
90 //bug #299733
91 JspFactory fact = JspFactory.getDefaultFactory();
92 if (fact == null)
93 { //bug #299733
94 //JspFactory does a simple Class.getForName("org.apache.jasper.runtime.JspFactoryImpl")
95 //however its bundles does not import the jasper package
96 //so it fails. let's help things out:
97 fact = (JspFactory)JettyBootstrapActivator.class.getClassLoader()
98 .loadClass(DEFAULT_JSP_FACTORY_IMPL_CLASS).newInstance();
99 JspFactory.setDefaultFactory(fact);
100 }
101
102 }
103 catch (Exception e)
104 {
105 System.err.println("Unable to set the JspFactory: jsp support incomplete.");
106 e.printStackTrace();
107 }
108 }
109
110 /**
111 * The jasper TldScanner expects a URLClassloader to parse a jar for the /META-INF/*.tld it may contain. We place the bundles that we know contain such
112 * tag-libraries. Please note that it will work if and only if the bundle is a jar (!) Currently we just hardcode the bundle that contains the jstl
113 * implemenation.
114 *
115 * A workaround when the tld cannot be parsed with this method is to copy and paste it inside the WEB-INF of the webapplication where it is used.
116 *
117 * Support only 2 types of packaging for the bundle: - the bundle is a jar (recommended for runtime.) - the bundle is a folder and contain jars in the root
118 * and/or in the lib folder (nice for PDE developement situations) Unsupported: the bundle is a jar that embeds more jars.
119 *
120 * @return array of URLs
121 * @throws Exception
122 */
123 public URL[] getJarsWithTlds(OSGiAppProvider provider, BundleFileLocatorHelper locatorHelper) throws Exception
124 {
125 HashSet<Class<?>> classesToAddToTheTldBundles = new HashSet<Class<?>>();
126
127 //Look for the jstl bundle
128 //We assume the jstl's tlds are defined there.
129 //We assume that the jstl bundle is imported by this bundle
130 //So we can look for this class using this bundle's classloader:
131 Class<?> jstlClass = WebappRegistrationCustomizerImpl.class.getClassLoader().loadClass(DEFAULT_JSTL_BUNDLE_CLASS);
132
133 classesToAddToTheTldBundles.add(jstlClass);
134
135 ArrayList<URL> urls = new ArrayList<URL>();
136 for (Class<?> cl : classesToAddToTheTldBundles)
137 {
138 Bundle tldBundle = FrameworkUtil.getBundle(cl);
139 File tldBundleLocation = locatorHelper.getBundleInstallLocation(tldBundle);
140 if (tldBundleLocation != null && tldBundleLocation.isDirectory())
141 {
142 // try to find the jar files inside this folder
143 for (File f : tldBundleLocation.listFiles())
144 {
145 if (f.getName().endsWith(".jar") && f.isFile())
146 {
147 urls.add(f.toURI().toURL());
148 }
149 else if (f.isDirectory() && f.getName().equals("lib"))
150 {
151 for (File f2 : tldBundleLocation.listFiles())
152 {
153 if (f2.getName().endsWith(".jar") && f2.isFile())
154 {
155 urls.add(f2.toURI().toURL());
156 }
157 }
158 }
159 }
160
161 }
162 else if (tldBundleLocation != null)
163 {
164 urls.add(tldBundleLocation.toURI().toURL());
165 }
166 }
167 return urls.toArray(new URL[urls.size()]);
168 }
169
170 /**
171 * Jasper resolves the dtd when it parses a taglib descriptor.
172 * It uses this code to do that: ParserUtils.getClass().getResourceAsStream(resourcePath); where
173 * resourcePath is for example: /javax/servlet/jsp/resources/web-jsptaglibrary_1_2.dtd Unfortunately,
174 * the dtd file is not in the exact same classloader as
175 * ParserUtils class and the dtds are packaged in 2 separate bundles.
176 * OSGi does not look in the dependencies' classloader when a resource is searched.
177 * <p>
178 * The workaround consists of setting the entity resolver. That is a patch
179 * added to the version of glassfish-jasper-jetty. IT is also present in the latest
180 * version of glassfish jasper. Could not use introspection to set new value
181 * on a static friendly field :(
182 * </p>
183 */
184 void fixupDtdResolution()
185 {
186 try
187 {
188 ParserUtils.setEntityResolver(new MyFixedupEntityResolver());
189
190 }
191 catch (Exception e)
192 {
193 e.printStackTrace();
194 }
195
196 }
197
198 /**
199 * Instead of using the ParserUtil's classloader, we use a class that is indeed next to the resource for sure.
200 */
201 static class MyFixedupEntityResolver implements EntityResolver
202 {
203 /**
204 * Same values than in ParserUtils...
205 */
206 static final String[] CACHED_DTD_PUBLIC_IDS =
207 { Constants.TAGLIB_DTD_PUBLIC_ID_11, Constants.TAGLIB_DTD_PUBLIC_ID_12,
208 Constants.WEBAPP_DTD_PUBLIC_ID_22, Constants.WEBAPP_DTD_PUBLIC_ID_23, };
209
210 static final String[] CACHED_DTD_RESOURCE_PATHS =
211 { Constants.TAGLIB_DTD_RESOURCE_PATH_11,
212 Constants.TAGLIB_DTD_RESOURCE_PATH_12,
213 Constants.WEBAPP_DTD_RESOURCE_PATH_22,
214 Constants.WEBAPP_DTD_RESOURCE_PATH_23, };
215
216 // static final String[] CACHED_SCHEMA_RESOURCE_PATHS = {
217 // Constants.TAGLIB_SCHEMA_RESOURCE_PATH_20,
218 // Constants.TAGLIB_SCHEMA_RESOURCE_PATH_21,
219 // Constants.WEBAPP_SCHEMA_RESOURCE_PATH_24,
220 // Constants.WEBAPP_SCHEMA_RESOURCE_PATH_25,
221 // };
222 public InputSource resolveEntity(String publicId, String systemId) throws SAXException
223 {
224 for (int i = 0; i < CACHED_DTD_PUBLIC_IDS.length; i++)
225 {
226 String cachedDtdPublicId = CACHED_DTD_PUBLIC_IDS[i];
227 if (cachedDtdPublicId.equals(publicId))
228 {
229 String resourcePath = CACHED_DTD_RESOURCE_PATHS[i];
230 InputStream input = null;
231 input = Servlet.class.getResourceAsStream(resourcePath);
232 if (input == null)
233 {
234 input = JspContext.class.getResourceAsStream(resourcePath);
235 if (input == null)
236 {
237 // if that failed try again with the original code:
238 // although it is likely not changed.
239 input = this.getClass().getResourceAsStream(resourcePath);
240 }
241 }
242 if (input == null)
243 {
244 throw new SAXException(Localizer.getMessage("jsp.error.internal.filenotfound",resourcePath));
245 }
246 InputSource isrc = new InputSource(input);
247 return isrc;
248 }
249 }
250
251 return null;
252 }
253 }
254
255 }