Source Code Cross Referenced for JspRuntimeContext.java in  » Sevlet-Container » apache-tomcat-6.0.14 » org » apache » jasper » compiler » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » org.apache.jasper.compiler 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:
018:        package org.apache.jasper.compiler;
019:
020:        import java.io.File;
021:        import java.io.FileNotFoundException;
022:        import java.io.FilePermission;
023:        import java.net.URL;
024:        import java.net.URLClassLoader;
025:        import java.security.CodeSource;
026:        import java.security.PermissionCollection;
027:        import java.security.Policy;
028:        import java.security.cert.Certificate;
029:        import java.util.Iterator;
030:        import java.util.Map;
031:        import java.util.concurrent.ConcurrentHashMap;
032:
033:        import javax.servlet.ServletContext;
034:        import javax.servlet.jsp.JspFactory;
035:
036:        import org.apache.jasper.Constants;
037:        import org.apache.jasper.JspCompilationContext;
038:        import org.apache.jasper.Options;
039:        import org.apache.jasper.runtime.JspFactoryImpl;
040:        import org.apache.jasper.security.SecurityClassLoad;
041:        import org.apache.jasper.servlet.JspServletWrapper;
042:        import org.apache.juli.logging.Log;
043:        import org.apache.juli.logging.LogFactory;
044:
045:        /**
046:         * Class for tracking JSP compile time file dependencies when the
047:         * &060;%@include file="..."%&062; directive is used.
048:         *
049:         * A background thread periodically checks the files a JSP page
050:         * is dependent upon.  If a dpendent file changes the JSP page
051:         * which included it is recompiled.
052:         *
053:         * Only used if a web application context is a directory.
054:         *
055:         * @author Glenn L. Nielsen
056:         * @version $Revision: 505593 $
057:         */
058:        public final class JspRuntimeContext {
059:
060:            // Logger
061:            private Log log = LogFactory.getLog(JspRuntimeContext.class);
062:
063:            /*
064:             * Counts how many times the webapp's JSPs have been reloaded.
065:             */
066:            private int jspReloadCount;
067:
068:            /**
069:             * Preload classes required at runtime by a JSP servlet so that
070:             * we don't get a defineClassInPackage security exception.
071:             */
072:            static {
073:                JspFactoryImpl factory = new JspFactoryImpl();
074:                SecurityClassLoad.securityClassLoad(factory.getClass()
075:                        .getClassLoader());
076:                if (System.getSecurityManager() != null) {
077:                    String basePackage = "org.apache.jasper.";
078:                    try {
079:                        factory
080:                                .getClass()
081:                                .getClassLoader()
082:                                .loadClass(
083:                                        basePackage
084:                                                + "runtime.JspFactoryImpl$PrivilegedGetPageContext");
085:                        factory
086:                                .getClass()
087:                                .getClassLoader()
088:                                .loadClass(
089:                                        basePackage
090:                                                + "runtime.JspFactoryImpl$PrivilegedReleasePageContext");
091:                        factory.getClass().getClassLoader().loadClass(
092:                                basePackage + "runtime.JspRuntimeLibrary");
093:                        factory
094:                                .getClass()
095:                                .getClassLoader()
096:                                .loadClass(
097:                                        basePackage
098:                                                + "runtime.JspRuntimeLibrary$PrivilegedIntrospectHelper");
099:                        factory
100:                                .getClass()
101:                                .getClassLoader()
102:                                .loadClass(
103:                                        basePackage
104:                                                + "runtime.ServletResponseWrapperInclude");
105:                        factory.getClass().getClassLoader().loadClass(
106:                                basePackage + "servlet.JspServletWrapper");
107:                    } catch (ClassNotFoundException ex) {
108:                        throw new IllegalStateException(ex);
109:                    }
110:                }
111:
112:                JspFactory.setDefaultFactory(factory);
113:            }
114:
115:            // ----------------------------------------------------------- Constructors
116:
117:            /**
118:             * Create a JspRuntimeContext for a web application context.
119:             *
120:             * Loads in any previously generated dependencies from file.
121:             *
122:             * @param context ServletContext for web application
123:             */
124:            public JspRuntimeContext(ServletContext context, Options options) {
125:
126:                this .context = context;
127:                this .options = options;
128:
129:                // Get the parent class loader
130:                parentClassLoader = (URLClassLoader) Thread.currentThread()
131:                        .getContextClassLoader();
132:                if (parentClassLoader == null) {
133:                    parentClassLoader = (URLClassLoader) this .getClass()
134:                            .getClassLoader();
135:                }
136:
137:                if (log.isDebugEnabled()) {
138:                    if (parentClassLoader != null) {
139:                        log.debug(Localizer.getMessage(
140:                                "jsp.message.parent_class_loader_is",
141:                                parentClassLoader.toString()));
142:                    } else {
143:                        log
144:                                .debug(Localizer.getMessage(
145:                                        "jsp.message.parent_class_loader_is",
146:                                        "<none>"));
147:                    }
148:                }
149:
150:                initClassPath();
151:
152:                if (context instanceof  org.apache.jasper.servlet.JspCServletContext) {
153:                    return;
154:                }
155:
156:                if (Constants.IS_SECURITY_ENABLED) {
157:                    initSecurity();
158:                }
159:
160:                // If this web application context is running from a
161:                // directory, start the background compilation thread
162:                String appBase = context.getRealPath("/");
163:                if (!options.getDevelopment() && appBase != null
164:                        && options.getCheckInterval() > 0) {
165:                    lastCheck = System.currentTimeMillis();
166:                }
167:            }
168:
169:            // ----------------------------------------------------- Instance Variables
170:
171:            /**
172:             * This web applications ServletContext
173:             */
174:            private ServletContext context;
175:            private Options options;
176:            private URLClassLoader parentClassLoader;
177:            private PermissionCollection permissionCollection;
178:            private CodeSource codeSource;
179:            private String classpath;
180:            private long lastCheck = -1L;
181:
182:            /**
183:             * Maps JSP pages to their JspServletWrapper's
184:             */
185:            private Map<String, JspServletWrapper> jsps = new ConcurrentHashMap<String, JspServletWrapper>();
186:
187:            // ------------------------------------------------------ Public Methods
188:
189:            /**
190:             * Add a new JspServletWrapper.
191:             *
192:             * @param jspUri JSP URI
193:             * @param jsw Servlet wrapper for JSP
194:             */
195:            public void addWrapper(String jspUri, JspServletWrapper jsw) {
196:                jsps.put(jspUri, jsw);
197:            }
198:
199:            /**
200:             * Get an already existing JspServletWrapper.
201:             *
202:             * @param jspUri JSP URI
203:             * @return JspServletWrapper for JSP
204:             */
205:            public JspServletWrapper getWrapper(String jspUri) {
206:                return jsps.get(jspUri);
207:            }
208:
209:            /**
210:             * Remove a  JspServletWrapper.
211:             *
212:             * @param jspUri JSP URI of JspServletWrapper to remove
213:             */
214:            public void removeWrapper(String jspUri) {
215:                jsps.remove(jspUri);
216:            }
217:
218:            /**
219:             * Returns the number of JSPs for which JspServletWrappers exist, i.e.,
220:             * the number of JSPs that have been loaded into the webapp.
221:             *
222:             * @return The number of JSPs that have been loaded into the webapp
223:             */
224:            public int getJspCount() {
225:                return jsps.size();
226:            }
227:
228:            /**
229:             * Get the SecurityManager Policy CodeSource for this web
230:             * applicaiton context.
231:             *
232:             * @return CodeSource for JSP
233:             */
234:            public CodeSource getCodeSource() {
235:                return codeSource;
236:            }
237:
238:            /**
239:             * Get the parent URLClassLoader.
240:             *
241:             * @return URLClassLoader parent
242:             */
243:            public URLClassLoader getParentClassLoader() {
244:                return parentClassLoader;
245:            }
246:
247:            /**
248:             * Get the SecurityManager PermissionCollection for this
249:             * web application context.
250:             *
251:             * @return PermissionCollection permissions
252:             */
253:            public PermissionCollection getPermissionCollection() {
254:                return permissionCollection;
255:            }
256:
257:            /**
258:             * Process a "destory" event for this web application context.
259:             */
260:            public void destroy() {
261:                Iterator servlets = jsps.values().iterator();
262:                while (servlets.hasNext()) {
263:                    ((JspServletWrapper) servlets.next()).destroy();
264:                }
265:            }
266:
267:            /**
268:             * Increments the JSP reload counter.
269:             */
270:            public synchronized void incrementJspReloadCount() {
271:                jspReloadCount++;
272:            }
273:
274:            /**
275:             * Resets the JSP reload counter.
276:             *
277:             * @param count Value to which to reset the JSP reload counter
278:             */
279:            public synchronized void setJspReloadCount(int count) {
280:                this .jspReloadCount = count;
281:            }
282:
283:            /**
284:             * Gets the current value of the JSP reload counter.
285:             *
286:             * @return The current value of the JSP reload counter
287:             */
288:            public int getJspReloadCount() {
289:                return jspReloadCount;
290:            }
291:
292:            /**
293:             * Method used by background thread to check the JSP dependencies
294:             * registered with this class for JSP's.
295:             */
296:            public void checkCompile() {
297:
298:                if (lastCheck < 0) {
299:                    // Checking was disabled
300:                    return;
301:                }
302:                long now = System.currentTimeMillis();
303:                if (now > (lastCheck + (options.getCheckInterval() * 1000L))) {
304:                    lastCheck = now;
305:                } else {
306:                    return;
307:                }
308:
309:                Object[] wrappers = jsps.values().toArray();
310:                for (int i = 0; i < wrappers.length; i++) {
311:                    JspServletWrapper jsw = (JspServletWrapper) wrappers[i];
312:                    JspCompilationContext ctxt = jsw.getJspEngineContext();
313:                    // JspServletWrapper also synchronizes on this when
314:                    // it detects it has to do a reload
315:                    synchronized (jsw) {
316:                        try {
317:                            ctxt.compile();
318:                        } catch (FileNotFoundException ex) {
319:                            ctxt.incrementRemoved();
320:                        } catch (Throwable t) {
321:                            jsw.getServletContext().log(
322:                                    "Background compile failed", t);
323:                        }
324:                    }
325:                }
326:
327:            }
328:
329:            /**
330:             * The classpath that is passed off to the Java compiler.
331:             */
332:            public String getClassPath() {
333:                return classpath;
334:            }
335:
336:            // -------------------------------------------------------- Private Methods
337:
338:            /**
339:             * Method used to initialize classpath for compiles.
340:             */
341:            private void initClassPath() {
342:
343:                URL[] urls = parentClassLoader.getURLs();
344:                StringBuffer cpath = new StringBuffer();
345:                String sep = System.getProperty("path.separator");
346:
347:                for (int i = 0; i < urls.length; i++) {
348:                    // Tomcat 4 can use URL's other than file URL's,
349:                    // a protocol other than file: will generate a
350:                    // bad file system path, so only add file:
351:                    // protocol URL's to the classpath.
352:
353:                    if (urls[i].getProtocol().equals("file")) {
354:                        cpath.append((String) urls[i].getFile() + sep);
355:                    }
356:                }
357:
358:                cpath.append(options.getScratchDir() + sep);
359:
360:                String cp = (String) context
361:                        .getAttribute(Constants.SERVLET_CLASSPATH);
362:                if (cp == null || cp.equals("")) {
363:                    cp = options.getClassPath();
364:                }
365:
366:                classpath = cpath.toString() + cp;
367:
368:                if (log.isDebugEnabled()) {
369:                    log.debug("Compilation classpath initialized: "
370:                            + getClassPath());
371:                }
372:            }
373:
374:            /**
375:             * Method used to initialize SecurityManager data.
376:             */
377:            private void initSecurity() {
378:
379:                // Setup the PermissionCollection for this web app context
380:                // based on the permissions configured for the root of the
381:                // web app context directory, then add a file read permission
382:                // for that directory.
383:                Policy policy = Policy.getPolicy();
384:                if (policy != null) {
385:                    try {
386:                        // Get the permissions for the web app context
387:                        String docBase = context.getRealPath("/");
388:                        if (docBase == null) {
389:                            docBase = options.getScratchDir().toString();
390:                        }
391:                        String codeBase = docBase;
392:                        if (!codeBase.endsWith(File.separator)) {
393:                            codeBase = codeBase + File.separator;
394:                        }
395:                        File contextDir = new File(codeBase);
396:                        URL url = contextDir.getCanonicalFile().toURL();
397:                        codeSource = new CodeSource(url, (Certificate[]) null);
398:                        permissionCollection = policy
399:                                .getPermissions(codeSource);
400:
401:                        // Create a file read permission for web app context directory
402:                        if (!docBase.endsWith(File.separator)) {
403:                            permissionCollection.add(new FilePermission(
404:                                    docBase, "read"));
405:                            docBase = docBase + File.separator;
406:                        } else {
407:                            permissionCollection
408:                                    .add(new FilePermission(docBase.substring(
409:                                            0, docBase.length() - 1), "read"));
410:                        }
411:                        docBase = docBase + "-";
412:                        permissionCollection.add(new FilePermission(docBase,
413:                                "read"));
414:
415:                        // Create a file read permission for web app tempdir (work)
416:                        // directory
417:                        String workDir = options.getScratchDir().toString();
418:                        if (!workDir.endsWith(File.separator)) {
419:                            permissionCollection.add(new FilePermission(
420:                                    workDir, "read"));
421:                            workDir = workDir + File.separator;
422:                        }
423:                        workDir = workDir + "-";
424:                        permissionCollection.add(new FilePermission(workDir,
425:                                "read"));
426:
427:                        // Allow the JSP to access org.apache.jasper.runtime.HttpJspBase
428:                        permissionCollection
429:                                .add(new RuntimePermission(
430:                                        "accessClassInPackage.org.apache.jasper.runtime"));
431:
432:                        if (parentClassLoader instanceof  URLClassLoader) {
433:                            URL[] urls = parentClassLoader.getURLs();
434:                            String jarUrl = null;
435:                            String jndiUrl = null;
436:                            for (int i = 0; i < urls.length; i++) {
437:                                if (jndiUrl == null
438:                                        && urls[i].toString().startsWith(
439:                                                "jndi:")) {
440:                                    jndiUrl = urls[i].toString() + "-";
441:                                }
442:                                if (jarUrl == null
443:                                        && urls[i].toString().startsWith(
444:                                                "jar:jndi:")) {
445:                                    jarUrl = urls[i].toString();
446:                                    jarUrl = jarUrl.substring(0, jarUrl
447:                                            .length() - 2);
448:                                    jarUrl = jarUrl.substring(0, jarUrl
449:                                            .lastIndexOf('/'))
450:                                            + "/-";
451:                                }
452:                            }
453:                            if (jarUrl != null) {
454:                                permissionCollection.add(new FilePermission(
455:                                        jarUrl, "read"));
456:                                permissionCollection.add(new FilePermission(
457:                                        jarUrl.substring(4), "read"));
458:                            }
459:                            if (jndiUrl != null)
460:                                permissionCollection.add(new FilePermission(
461:                                        jndiUrl, "read"));
462:                        }
463:                    } catch (Exception e) {
464:                        context.log("Security Init for context failed", e);
465:                    }
466:                }
467:            }
468:
469:        }
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