ExtensionValidator.java
/*
* 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.catalina.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.StringTokenizer;
import java.util.jar.JarInputStream;
import java.util.jar.Manifest;
import org.apache.catalina.Context;
import org.apache.catalina.WebResource;
import org.apache.catalina.WebResourceRoot;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
/**
* Ensures that all extension dependencies are resolved for a WEB application
* are met. This class builds a list of extensions available to an application
* and then validates those extensions.
*
* See http://docs.oracle.com/javase/1.4.2/docs/guide/extensions/spec.html
* for a detailed explanation of the extension mechanism in Java.
*
* @author Greg Murray
* @author Justyna Horwat
*/
public final class ExtensionValidator {
private static final Log log = LogFactory.getLog(ExtensionValidator.class);
/**
* The string resources for this package.
*/
private static final StringManager sm =
StringManager.getManager("org.apache.catalina.util");
private static volatile List<Extension> containerAvailableExtensions = null;
private static final List<ManifestResource> containerManifestResources =
new ArrayList<>();
// ----------------------------------------------------- Static Initializer
/*
* This static initializer loads the container level extensions that are
* available to all web applications. This method scans all extension
* directories available via the "java.ext.dirs" System property.
*
* The System Class-Path is also scanned for jar files that may contain
* available extensions.
*/
static {
// check for container level optional packages
String systemClasspath = System.getProperty("java.class.path");
StringTokenizer strTok = new StringTokenizer(systemClasspath,
File.pathSeparator);
// build a list of jar files in the classpath
while (strTok.hasMoreTokens()) {
String classpathItem = strTok.nextToken();
if (classpathItem.toLowerCase(Locale.ENGLISH).endsWith(".jar")) {
File item = new File(classpathItem);
if (item.isFile()) {
try {
addSystemResource(item);
} catch (IOException e) {
log.error(sm.getString
("extensionValidator.failload", item), e);
}
}
}
}
// add specified folders to the list
addFolderList("java.ext.dirs");
}
// --------------------------------------------------------- Public Methods
/**
* Runtime validation of a Web Application.
*
* This method uses JNDI to look up the resources located under a
* <code>DirContext</code>. It locates Web Application MANIFEST.MF
* file in the /META-INF/ directory of the application and all
* MANIFEST.MF files in each JAR file located in the WEB-INF/lib
* directory and creates an <code>ArrayList</code> of
* <code>ManifestResource</code> objects. These objects are then passed
* to the validateManifestResources method for validation.
*
* @param resources The resources configured for this Web Application
* @param context The context from which the Logger and path to the
* application
*
* @return true if all required extensions satisfied
* @throws IOException Error reading resources needed for validation
*/
public static synchronized boolean validateApplication(
WebResourceRoot resources,
Context context)
throws IOException {
String appName = context.getName();
List<ManifestResource> appManifestResources = new ArrayList<>();
// Web application manifest
WebResource resource = resources.getResource("/META-INF/MANIFEST.MF");
if (resource.isFile()) {
try (InputStream inputStream = resource.getInputStream()) {
Manifest manifest = new Manifest(inputStream);
ManifestResource mre = new ManifestResource
(sm.getString("extensionValidator.web-application-manifest"),
manifest, ManifestResource.WAR);
appManifestResources.add(mre);
}
}
// Web application library manifests
WebResource[] manifestResources =
resources.getClassLoaderResources("/META-INF/MANIFEST.MF");
for (WebResource manifestResource : manifestResources) {
if (manifestResource.isFile()) {
// Primarily used for error reporting
String jarName = manifestResource.getURL().toExternalForm();
Manifest jmanifest = manifestResource.getManifest();
if (jmanifest != null) {
ManifestResource mre = new ManifestResource(jarName,
jmanifest, ManifestResource.APPLICATION);
appManifestResources.add(mre);
}
}
}
return validateManifestResources(appName, appManifestResources);
}
/**
* Checks to see if the given system JAR file contains a MANIFEST, and adds
* it to the container's manifest resources.
*
* @param jarFile The system JAR whose manifest to add
* @throws IOException Error reading JAR file
*/
public static void addSystemResource(File jarFile) throws IOException {
try (InputStream is = new FileInputStream(jarFile)) {
Manifest manifest = getManifest(is);
if (manifest != null) {
ManifestResource mre = new ManifestResource(jarFile.getAbsolutePath(), manifest,
ManifestResource.SYSTEM);
containerManifestResources.add(mre);
}
}
}
// -------------------------------------------------------- Private Methods
/**
* Validates an <code>ArrayList</code> of <code>ManifestResource</code>
* objects. This method requires an application name (which is the
* context root of the application at runtime).
*
* <code>false</code> is returned if the extension dependencies
* represented by any given <code>ManifestResource</code> objects
* is not met.
*
* This method should also provide static validation of a Web Application
* if provided with the necessary parameters.
*
* @param appName The name of the Application that will appear in the
* error messages
* @param resources A list of <code>ManifestResource</code> objects
* to be validated.
*
* @return true if manifest resource file requirements are met
*/
private static boolean validateManifestResources(String appName,
List<ManifestResource> resources) {
boolean passes = true;
int failureCount = 0;
List<Extension> availableExtensions = null;
for (ManifestResource mre : resources) {
ArrayList<Extension> requiredList = mre.getRequiredExtensions();
if (requiredList == null) {
continue;
}
// build the list of available extensions if necessary
if (availableExtensions == null) {
availableExtensions = buildAvailableExtensionsList(resources);
}
// load the container level resource map if it has not been built
// yet
if (containerAvailableExtensions == null) {
containerAvailableExtensions
= buildAvailableExtensionsList(containerManifestResources);
}
// iterate through the list of required extensions
for (Extension requiredExt : requiredList) {
boolean found = false;
// check the application itself for the extension
if (availableExtensions != null) {
for (Extension targetExt : availableExtensions) {
if (targetExt.isCompatibleWith(requiredExt)) {
requiredExt.setFulfilled(true);
found = true;
break;
}
}
}
// check the container level list for the extension
if (!found && containerAvailableExtensions != null) {
for (Extension targetExt : containerAvailableExtensions) {
if (targetExt.isCompatibleWith(requiredExt)) {
requiredExt.setFulfilled(true);
found = true;
break;
}
}
}
if (!found) {
// Failure
log.info(sm.getString(
"extensionValidator.extension-not-found-error",
appName, mre.getResourceName(),
requiredExt.getExtensionName()));
passes = false;
failureCount++;
}
}
}
if (!passes) {
log.info(sm.getString(
"extensionValidator.extension-validation-error", appName,
failureCount + ""));
}
return passes;
}
/*
* Build this list of available extensions so that we do not have to
* re-build this list every time we iterate through the list of required
* extensions. All available extensions in all of the
* <code>ManifestResource</code> objects will be added to a
* <code>HashMap</code> which is returned on the first dependency list
* processing pass.
*
* The key is the name + implementation version.
*
* NOTE: A list is built only if there is a dependency that needs
* to be checked (performance optimization).
*
* @param resources A list of <code>ManifestResource</code> objects
*
* @return HashMap Map of available extensions
*/
private static List<Extension> buildAvailableExtensionsList(
List<ManifestResource> resources) {
List<Extension> availableList = null;
for (ManifestResource mre : resources) {
ArrayList<Extension> list = mre.getAvailableExtensions();
if (list != null) {
for (Extension ext : list) {
if (availableList == null) {
availableList = new ArrayList<>();
availableList.add(ext);
} else {
availableList.add(ext);
}
}
}
}
return availableList;
}
/**
* Return the Manifest from a jar file or war file
*
* @param inStream Input stream to a WAR or JAR file
* @return The WAR's or JAR's manifest
*/
private static Manifest getManifest(InputStream inStream) throws IOException {
Manifest manifest = null;
try (JarInputStream jin = new JarInputStream(inStream)) {
manifest = jin.getManifest();
}
return manifest;
}
/**
* Add the JARs specified to the extension list.
*/
private static void addFolderList(String property) {
// get the files in the extensions directory
String extensionsDir = System.getProperty(property);
if (extensionsDir != null) {
StringTokenizer extensionsTok
= new StringTokenizer(extensionsDir, File.pathSeparator);
while (extensionsTok.hasMoreTokens()) {
File targetDir = new File(extensionsTok.nextToken());
if (!targetDir.isDirectory()) {
continue;
}
File[] files = targetDir.listFiles();
if (files == null) {
continue;
}
for (File file : files) {
if (file.getName().toLowerCase(Locale.ENGLISH).endsWith(".jar") && file.isFile()) {
try {
addSystemResource(file);
} catch (IOException e) {
log.error(sm.getString("extensionValidator.failload", file), e);
}
}
}
}
}
}
}