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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.ee8.webapp;

import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Consumer;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.eclipse.jetty.util.FileID;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.URIUtil;
import org.eclipse.jetty.util.UriPatternPredicate;
import org.eclipse.jetty.util.resource.MountedPathResource;
import org.eclipse.jetty.util.resource.Resource;
import org.eclipse.jetty.util.resource.ResourceCollators;
import org.eclipse.jetty.util.resource.ResourceFactory;
import org.eclipse.jetty.util.resource.ResourceUriPatternPredicate;
import org.eclipse.jetty.util.resource.Resources;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * MetaInfConfiguration
 * 

* * Scan META-INF of jars to find: *

    *
  • tlds
  • *
  • web-fragment.xml
  • *
  • resources
  • *
* * The jars which are scanned are: *
    *
  1. those from the container classpath whose pattern matched the WebInfConfiguration.CONTAINER_JAR_PATTERN
  2. *
  3. those from WEB-INF/lib
  4. *
*/ public class MetaInfConfiguration extends AbstractConfiguration { private static final Logger LOG = LoggerFactory.getLogger(MetaInfConfiguration.class); public static final String USE_CONTAINER_METAINF_CACHE = "org.eclipse.jetty.metainf.useCache"; public static final boolean DEFAULT_USE_CONTAINER_METAINF_CACHE = true; public static final String CACHED_CONTAINER_TLDS = "org.eclipse.jetty.tlds.cache"; public static final String CACHED_CONTAINER_FRAGMENTS = FragmentConfiguration.FRAGMENT_RESOURCES + ".cache"; public static final String CACHED_CONTAINER_RESOURCES = "org.eclipse.jetty.resources.cache"; public static final String METAINF_TLDS = "org.eclipse.jetty.tlds"; public static final String METAINF_FRAGMENTS = FragmentConfiguration.FRAGMENT_RESOURCES; public static final String METAINF_RESOURCES = "org.eclipse.jetty.resources"; public static final String CONTAINER_JAR_PATTERN = "org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern"; public static final String WEBINF_JAR_PATTERN = "org.eclipse.jetty.server.webapp.WebInfIncludeJarPattern"; public static final List __allScanTypes = Arrays.asList(METAINF_TLDS, METAINF_RESOURCES, METAINF_FRAGMENTS); /** * If set, to a list of URLs, these resources are added to the context * resource base as a resource collection. */ public static final String RESOURCE_DIRS = "org.eclipse.jetty.resources"; public MetaInfConfiguration() { addDependencies(WebXmlConfiguration.class); } @Override public void preConfigure(final WebAppContext context) throws Exception { //find container jars/modules and select which ones to scan findAndFilterContainerPaths(context); //find web-app jars and select which ones to scan findAndFilterWebAppPaths(context); //No pattern to appy to classes, just add to metadata context.getMetaData().setWebInfClassesResources(findClassDirs(context)); scanJars(context); } @Override public void deconfigure(WebAppContext context) throws Exception { super.deconfigure(context); } /** * Find jars and directories that are on the container's classpath * and apply an optional filter. The filter is a pattern applied to the * full jar or directory names. If there is no pattern, then no jar * or dir is considered to match. * * Those jars that do match will be later examined for META-INF * information and annotations. * * To find them, examine the classloaders in the hierarchy above the * webapp classloader that are URLClassLoaders. For jdk-9 we also * look at the java.class.path, and the jdk.module.path. * * @param context the WebAppContext being deployed */ public void findAndFilterContainerPaths(final WebAppContext context) throws Exception { String pattern = (String) context.getAttribute(CONTAINER_JAR_PATTERN); if (LOG.isDebugEnabled()) LOG.debug("{}={}", CONTAINER_JAR_PATTERN, pattern); if (StringUtil.isBlank(pattern)) // TODO review if this short cut will allow later code simplifications return; ResourceFactory resourceFactory = context.getResourceFactory(); // Apply an initial name filter to the jars to select which will be eventually // scanned for META-INF info and annotations. The filter is based on inclusion patterns. UriPatternPredicate uriPatternPredicate = new UriPatternPredicate(pattern, false); Consumer addContainerResource = (resource) -> { if (Resources.missing(resource)) { if (LOG.isDebugEnabled()) LOG.debug("Classpath URI doesn't exist: " + resource); } else { context.getMetaData().addContainerResource(resource); } }; List containerUris = getAllContainerJars(context); if (LOG.isDebugEnabled()) LOG.debug("All container urls {}", containerUris); containerUris.stream().filter(uriPatternPredicate).map(resourceFactory::newResource).filter(Objects::nonNull).forEach(addContainerResource); // When running on jvm 9 or above, we won't be able to look at the application // classloader to extract urls, so we need to examine the classpath instead. String classPath = System.getProperty("java.class.path"); if (classPath != null) { Stream.of(classPath.split(File.pathSeparator)).map(resourceFactory::newResource).filter(r -> uriPatternPredicate.test(r.getURI())).forEach(addContainerResource); } // We also need to examine the module path. // TODO need to consider the jdk.module.upgrade.path - how to resolve // which modules will be actually used. If its possible, it can // only be attempted in jetty-10 with jdk-9 specific apis. String modulePath = System.getProperty("jdk.module.path"); if (modulePath != null) { List matchingBasePaths = Stream.of(modulePath.split(File.pathSeparator)).map(resourceFactory::newResource).filter(Objects::nonNull).map(Resource::getURI).filter(uriPatternPredicate).map(Paths::get).toList(); for (Path path : matchingBasePaths) { if (Files.isDirectory(path)) { try (Stream listing = Files.list(path)) { for (Path listEntry : listing.toList()) { Resource resource = resourceFactory.newResource(listEntry); context.getMetaData().addContainerResource(resource); } } } else { Resource resource = resourceFactory.newResource(path); context.getMetaData().addContainerResource(resource); } } } if (LOG.isDebugEnabled()) LOG.debug("Container paths selected:{}", context.getMetaData().getContainerResources()); } /** * Finds the jars that are either physically or virtually in * WEB-INF/lib, and applies an optional filter to their full * pathnames. * * The filter selects which jars will later be examined for META-INF * information and annotations. If there is no pattern, then * all jars are considered selected. * * @param context the WebAppContext being deployed */ public void findAndFilterWebAppPaths(WebAppContext context) throws Exception { //Apply filter to WEB-INF/lib jars String pattern = (String) context.getAttribute(WEBINF_JAR_PATTERN); ResourceUriPatternPredicate webinfPredicate = new ResourceUriPatternPredicate(pattern, true); List jars = findJars(context); if (LOG.isDebugEnabled()) LOG.debug("webapp {}={} jars {}", WEBINF_JAR_PATTERN, pattern, jars); // Only add matching Resources to metadata.webInfResources if (jars != null) { jars.stream().filter(webinfPredicate).forEach(resource -> context.getMetaData().addWebInfResource(resource)); } } protected List getAllContainerJars(final WebAppContext context) { ClassLoader loader = MetaInfConfiguration.class.getClassLoader(); List uris = new ArrayList<>(); while (loader != null) { if (loader instanceof URLClassLoader urlCL) { URIUtil.streamOf(urlCL).forEach(uris::add); } loader = loader.getParent(); } return uris; } @Override public void configure(WebAppContext context) throws Exception { // Look for extra resource @SuppressWarnings("unchecked") Set resources = (Set) context.getAttribute(RESOURCE_DIRS); if (resources != null && !resources.isEmpty()) { List collection = new ArrayList<>(); collection.add(context.getBaseResource()); collection.addAll(resources); context.setBaseResource(ResourceFactory.combine(collection)); } } protected void scanJars(WebAppContext context) throws Exception { boolean useContainerCache = DEFAULT_USE_CONTAINER_METAINF_CACHE; if (context.getServer() != null) { Boolean attr = (Boolean) context.getServer().getAttribute(USE_CONTAINER_METAINF_CACHE); if (attr != null) useContainerCache = attr.booleanValue(); } if (LOG.isDebugEnabled()) LOG.debug("{} = {}", USE_CONTAINER_METAINF_CACHE, useContainerCache); //pre-emptively create empty lists for tlds, fragments and resources as context attributes //this signals that this class has been called. This differentiates the case where this class //has been called but finds no META-INF data from the case where this class was never called if (context.getAttribute(METAINF_TLDS) == null) context.setAttribute(METAINF_TLDS, new HashSet()); if (context.getAttribute(METAINF_RESOURCES) == null) context.setAttribute(METAINF_RESOURCES, new HashSet()); if (context.getAttribute(METAINF_FRAGMENTS) == null) context.setAttribute(METAINF_FRAGMENTS, new HashMap()); //always scan everything from the container's classpath scanJars(context, context.getMetaData().getContainerResources(), useContainerCache, __allScanTypes); //only look for fragments if web.xml is not metadata complete, or it version 3.0 or greater List scanTypes = new ArrayList<>(__allScanTypes); if (context.getMetaData().isMetaDataComplete() || (context.getServletContext().getEffectiveMajorVersion() < 3) && !context.isConfigurationDiscovered()) scanTypes.remove(METAINF_FRAGMENTS); scanJars(context, context.getMetaData().getWebInfResources(false), false, scanTypes); } /** * For backwards compatibility. This method will always scan for all types of data. * * @param context the context for the scan * @param jars the jars to scan * @param useCaches if true, the scanned info is cached * @throws Exception if unable to scan the jars */ public void scanJars(final WebAppContext context, Collection jars, boolean useCaches) throws Exception { scanJars(context, jars, useCaches, __allScanTypes); } /** * Look into the jars to discover info in META-INF. If useCaches == true, then we will * cache the info discovered indexed by the jar in which it was discovered: this speeds * up subsequent context deployments. * * @param context the context for the scan * @param jars the jars resources to scan * @param useCaches if true, cache the info discovered * @param scanTypes the type of things to look for in the jars * @throws Exception if unable to scan the jars */ @SuppressWarnings("unchecked") public void scanJars(final WebAppContext context, Collection jars, boolean useCaches, List scanTypes) throws Exception { ConcurrentHashMap metaInfResourceCache = null; ConcurrentHashMap metaInfFragmentCache = null; ConcurrentHashMap> metaInfTldCache = null; if (useCaches) { metaInfResourceCache = (ConcurrentHashMap) context.getServer().getAttribute(CACHED_CONTAINER_RESOURCES); if (metaInfResourceCache == null) { metaInfResourceCache = new ConcurrentHashMap(); context.getServer().setAttribute(CACHED_CONTAINER_RESOURCES, metaInfResourceCache); } metaInfFragmentCache = (ConcurrentHashMap) context.getServer().getAttribute(CACHED_CONTAINER_FRAGMENTS); if (metaInfFragmentCache == null) { metaInfFragmentCache = new ConcurrentHashMap(); context.getServer().setAttribute(CACHED_CONTAINER_FRAGMENTS, metaInfFragmentCache); } metaInfTldCache = (ConcurrentHashMap>) context.getServer().getAttribute(CACHED_CONTAINER_TLDS); if (metaInfTldCache == null) { metaInfTldCache = new ConcurrentHashMap>(); context.getServer().setAttribute(CACHED_CONTAINER_TLDS, metaInfTldCache); } } //Scan jars for META-INF information if (jars != null) { try (ResourceFactory.Closeable scanResourceFactory = ResourceFactory.closeable()) { for (Resource dir : jars) { try { //if not already a directory, convert it by mounting as jar file if (!dir.isDirectory()) dir = scanResourceFactory.newJarFileResource(dir.getURI()); } catch (Exception e) { //not an appropriate uri, skip it continue; } if (isEmptyResource(dir)) continue; if (scanTypes.contains(METAINF_RESOURCES)) scanForResources(context, dir, metaInfResourceCache); if (scanTypes.contains(METAINF_FRAGMENTS)) scanForFragment(context, dir, metaInfFragmentCache); if (scanTypes.contains(METAINF_TLDS)) scanForTlds(context, dir, metaInfTldCache); } } } } /** * Scan for META-INF/resources dir in the given directory. * * @param context the context for the scan * @param dir the target directory to scan * @param cache the resource cache */ public void scanForResources(WebAppContext context, Resource dir, ConcurrentHashMap cache) { // Resource target does not exist if (isEmptyResource(dir)) return; Resource resourcesDir = null; if (cache != null && cache.containsKey(dir)) { resourcesDir = cache.get(dir); if (isEmptyResource(resourcesDir)) { if (LOG.isDebugEnabled()) LOG.debug("{} cached as containing no META-INF/resources", dir); return; } else if (LOG.isDebugEnabled()) LOG.debug("{} META-INF/resources found in cache ", dir); } else { //not using caches or not in the cache so check for the resources dir if (LOG.isDebugEnabled()) LOG.debug("{} META-INF/resources checked", dir); resourcesDir = dir.resolve("/META-INF/resources"); if (isEmptyResource(resourcesDir)) return; //convert from an ephemeral Resource to one that is associated with the context's lifecycle resourcesDir = context.getResourceFactory().newResource(resourcesDir.getURI()); if (cache != null) { Resource old = cache.putIfAbsent(dir, resourcesDir); if (old != null) resourcesDir = old; else if (LOG.isDebugEnabled()) LOG.debug("{} META-INF/resources cache updated", dir); } } //add it to the meta inf resources for this context Set dirs = (Set) context.getAttribute(METAINF_RESOURCES); if (dirs == null) { dirs = new HashSet(); context.setAttribute(METAINF_RESOURCES, dirs); } if (LOG.isDebugEnabled()) LOG.debug("{} added to context", resourcesDir); dirs.add(resourcesDir); } private static boolean isEmptyResource(Resource resourcesDir) { return resourcesDir == null || !resourcesDir.isDirectory(); } /** * Scan for META-INF/web-fragment.xml file in the given jar. * * @param context the context for the scan * @param dir the directory to scan for fragments * @param cache the resource cache */ public void scanForFragment(WebAppContext context, Resource dir, ConcurrentHashMap cache) { Resource webFrag = null; if (cache != null && cache.containsKey(dir)) { webFrag = cache.get(dir); if (isEmptyFragment(webFrag)) { if (LOG.isDebugEnabled()) LOG.debug("{} cached as containing no META-INF/web-fragment.xml", dir); return; } else if (LOG.isDebugEnabled()) LOG.debug("{} META-INF/web-fragment.xml found in cache ", dir); } else { //not using caches or not in the cache so check for the web-fragment.xml if (LOG.isDebugEnabled()) LOG.debug("{} META-INF/web-fragment.xml checked", dir); webFrag = dir.resolve("META-INF/web-fragment.xml"); if (isEmptyFragment(webFrag)) return; //convert ephemeral Resource to one associated with the context's lifecycle ResourceFactory webFrag = context.getResourceFactory().newResource(webFrag.getURI()); if (cache != null) { Resource old = cache.putIfAbsent(dir, webFrag); if (old != null) webFrag = old; else if (LOG.isDebugEnabled()) LOG.debug("{} META-INF/web-fragment.xml cache updated", dir); } } Map fragments = (Map) context.getAttribute(METAINF_FRAGMENTS); if (fragments == null) { fragments = new HashMap(); context.setAttribute(METAINF_FRAGMENTS, fragments); } if (dir instanceof MountedPathResource) { //ensure we link from the original .jar rather than jar:file: dir = context.getResourceFactory().newResource(((MountedPathResource) dir).getContainerPath()); } fragments.put(dir, webFrag); if (LOG.isDebugEnabled()) LOG.debug("{} added to context", webFrag); } private static boolean isEmptyFragment(Resource webFrag) { return !Resources.isReadableFile(webFrag); } /** * Discover META-INF/*.tld files in the given jar * * @param context the context for the scan * @param dir the directory to scan for .tlds * @param cache the resource cache * @throws Exception if unable to scan for .tlds */ public void scanForTlds(WebAppContext context, Resource dir, ConcurrentHashMap> cache) throws Exception { Collection tlds; if (isEmptyResource(dir)) return; if (cache != null && cache.containsKey(dir)) { Collection tmp = cache.get(dir); if (tmp.isEmpty()) { if (LOG.isDebugEnabled()) LOG.debug("{} cached as containing no tlds", dir); return; } else { tlds = tmp; if (LOG.isDebugEnabled()) LOG.debug("{} tlds found in cache ", dir); } } else { //not using caches or not in the cache so find all tlds tlds = new HashSet<>(); tlds.addAll(getTlds(context, dir)); if (cache != null) { if (LOG.isDebugEnabled()) LOG.debug("{} tld cache updated", dir); Collection old = cache.putIfAbsent(dir, tlds); if (old != null) tlds = old; } if (tlds.isEmpty()) return; } Collection metaInfTlds = (Collection) context.getAttribute(METAINF_TLDS); if (metaInfTlds == null) { metaInfTlds = new HashSet<>(); context.setAttribute(METAINF_TLDS, metaInfTlds); } metaInfTlds.addAll(tlds); if (LOG.isDebugEnabled()) LOG.debug("tlds added to context"); } @Override public void postConfigure(WebAppContext context) throws Exception { context.setAttribute(METAINF_RESOURCES, null); context.setAttribute(METAINF_FRAGMENTS, null); context.setAttribute(METAINF_TLDS, null); } /** * Find all .tld files in the given jar. * * @param dir the dir to check for .tlds * @return the collection of tlds as url references * @throws IOException if unable to scan the jar file */ private Collection getTlds(WebAppContext context, Resource dir) throws IOException { HashSet tlds = new HashSet<>(); Resource metaInf = dir.resolve("META-INF"); if (isEmptyResource(metaInf)) //no tlds return tlds; try (Stream stream = Files.walk(metaInf.getPath())) { Iterator it = stream.filter(Files::isRegularFile).filter(FileID::isTld).iterator(); while (it.hasNext()) { Path entry = it.next(); tlds.add(entry.toUri().toURL()); } } return tlds; } protected List findClassDirs(WebAppContext context) throws Exception { if (context == null) return null; List classDirs = new ArrayList(); Resource webInfClasses = findWebInfClassesDir(context); if (webInfClasses != null) classDirs.add(webInfClasses); classDirs.addAll(findExtraClasspathDirs(context)); return classDirs; } /** * Look for jars that should be treated as if they are in WEB-INF/lib * * @param context the context to find the jars in * @return the list of jar resources found within context * @throws Exception if unable to find the jars */ protected List findJars(WebAppContext context) throws Exception { List jarResources = new ArrayList<>(); jarResources.addAll(findWebInfLibJars(context)); List extraClasspathJars = findExtraClasspathJars(context); if (extraClasspathJars != null) jarResources.addAll(extraClasspathJars); return jarResources; } /** * Look for jars in WEB-INF/lib * * @param context the context to find the lib jars in * @return the list of jars as {@link Resource} * @throws Exception if unable to scan for lib jars */ protected List findWebInfLibJars(WebAppContext context) throws Exception { if (context == null) return List.of(); Resource webInf = context.getWebInf(); if (Resources.isReadableDirectory(webInf)) { Resource webInfLib = webInf.resolve("lib"); if (Resources.isReadableDirectory(webInfLib)) { return webInfLib.list().stream().filter((lib) -> FileID.isLibArchive(lib.getFileName())).sorted(ResourceCollators.byName(true)).collect(Collectors.toList()); } } return List.of(); } /** * Get jars from WebAppContext.getExtraClasspath as resources * * @param context the context to find extra classpath jars in * @return the list of Resources with the extra classpath, or null if not found * @throws Exception if unable to resolve the extra classpath jars */ protected List findExtraClasspathJars(WebAppContext context) throws Exception { if (context == null || context.getExtraClasspath() == null) return null; return context.getExtraClasspath().stream().filter(this::isFileSupported).collect(Collectors.toList()); } /** * Get WEB-INF/classes dir * * @param context the context to look for the WEB-INF/classes directory * @return the Resource for the WEB-INF/classes directory * @throws Exception if unable to find the WEB-INF/classes directory */ protected Resource findWebInfClassesDir(WebAppContext context) throws Exception { if (context == null) return null; Resource webInf = context.getWebInf(); // Find WEB-INF/classes if (Resources.isReadableDirectory(webInf)) { // Look for classes directory Resource classesDir = webInf.resolve("classes/"); if (Resources.isReadableDirectory(classesDir)) return classesDir; } return null; } /** * Get class dirs from WebAppContext.getExtraClasspath as resources * * @param context the context to look for extra classpaths in * @return the list of Resources to the extra classpath */ protected List findExtraClasspathDirs(WebAppContext context) { if (context == null || context.getExtraClasspath() == null) return List.of(); return context.getExtraClasspath().stream().filter(Resource::isDirectory).collect(Collectors.toList()); } private boolean isFileSupported(Resource resource) { return FileID.isLibArchive(resource.getURI()); } }




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