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Jetty web application support
//
// ========================================================================
// 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.webapp;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import javax.servlet.ServletContext;
import org.eclipse.jetty.util.resource.EmptyResource;
import org.eclipse.jetty.util.resource.Resource;
import org.eclipse.jetty.util.thread.AutoLock;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* MetaData
*
* All data associated with the configuration and deployment of a web application.
*/
public class MetaData
{
private static final Logger LOG = LoggerFactory.getLogger(MetaData.class);
public static final String VALIDATE_XML = "org.eclipse.jetty.webapp.validateXml";
public static final String ORDERED_LIBS = "javax.servlet.context.orderedLibs";
public static final Resource NON_FRAG_RESOURCE = EmptyResource.INSTANCE;
private final AutoLock _lock = new AutoLock();
protected Map _origins = new HashMap<>();
protected WebDescriptor _webDefaultsRoot;
protected WebDescriptor _webXmlRoot;
protected final List _webOverrideRoots = new ArrayList<>();
protected boolean _metaDataComplete;
protected final List _descriptorProcessors = new ArrayList<>();
protected final List _webFragmentRoots = new ArrayList<>();
protected final Map _webFragmentNameMap = new HashMap<>();
protected final Map _webFragmentResourceMap = new HashMap<>();
protected final Map> _annotations = new HashMap<>();
protected final List _webInfClasses = new ArrayList<>();
protected final List _webInfJars = new ArrayList<>();
protected final List _orderedContainerResources = new ArrayList<>();
protected final List _orderedWebInfResources = new ArrayList<>();
protected Ordering _ordering; //can be set to RelativeOrdering by web-default.xml, web.xml, web-override.xml
protected boolean _allowDuplicateFragmentNames = false;
protected boolean _validateXml = false;
public enum Complete
{
NotSet, True, False
}
/**
* Metadata regarding where a deployable element was declared:
* by annotation or by descriptor.
*/
public static class OriginInfo
{
/**
* Identifier for the deployable element
*/
private final String name;
/**
* Origin of the deployable element
*/
private final Origin origin;
/**
* Reference to the descriptor, if declared in one
*/
private final Descriptor descriptor;
/**
* Reference to the annotation, if declared by one
*/
private final Annotation annotation;
/**
* The class containing the annotation, if declared by one
*/
private final Class annotated;
public OriginInfo(String n, Annotation a, Class ac)
{
if (Objects.isNull(n))
throw new IllegalArgumentException("No name");
name = n;
origin = Origin.of(a);
descriptor = null;
annotation = a;
annotated = ac;
}
public OriginInfo(String n, Descriptor d)
{
if (Objects.isNull(n))
throw new IllegalArgumentException("No name");
if (Objects.isNull(d))
throw new IllegalArgumentException("No descriptor");
name = n;
origin = Origin.of(d);
descriptor = d;
annotation = null;
annotated = null;
}
public OriginInfo(String n)
{
if (Objects.isNull(n))
throw new IllegalArgumentException("No name");
name = n;
origin = Origin.API;
annotation = null;
descriptor = null;
annotated = null;
}
public String getName()
{
return name;
}
public Origin getOriginType()
{
return origin;
}
public Descriptor getDescriptor()
{
return descriptor;
}
@Override
public String toString()
{
if (descriptor != null)
return descriptor.toString();
if (annotation != null)
return "@" + annotation.annotationType().getSimpleName() + "(" + annotated.getName() + ")";
return origin.toString();
}
}
public MetaData()
{
}
/**
* Empty ready for reuse
*/
public void clear()
{
_webDefaultsRoot = null;
_origins.clear();
_webXmlRoot = null;
_webOverrideRoots.clear();
_metaDataComplete = false;
_annotations.clear();
_descriptorProcessors.clear();
_webFragmentRoots.clear();
_webFragmentNameMap.clear();
_webFragmentResourceMap.clear();
_annotations.clear();
_webInfJars.clear();
_orderedWebInfResources.clear();
_orderedContainerResources.clear();
_ordering = null;
_allowDuplicateFragmentNames = false;
}
/**
* Set the web-default.xml.
*
* @param descriptor the web-default.xml
*/
public void setDefaultsDescriptor(DefaultsDescriptor descriptor)
throws Exception
{
_webDefaultsRoot = descriptor;
_webDefaultsRoot.parse(WebDescriptor.getParser(isValidateXml()));
if (_webDefaultsRoot.isOrdered())
{
Ordering ordering = getOrdering();
if (ordering == null)
ordering = new AbsoluteOrdering(this);
List order = _webDefaultsRoot.getOrdering();
for (String s : order)
{
if (s.equalsIgnoreCase("others"))
((AbsoluteOrdering)ordering).addOthers();
else
((AbsoluteOrdering)ordering).add(s);
}
//(re)set the ordering to cause webinf jar order to be recalculated
setOrdering(ordering);
}
}
/**
* @param descriptor the web.xml descriptor
*/
public void setWebDescriptor(WebDescriptor descriptor)
throws Exception
{
_webXmlRoot = descriptor;
_webXmlRoot.parse(WebDescriptor.getParser(isValidateXml()));
_metaDataComplete = WebDescriptor.isMetaDataComplete(_webXmlRoot);
if (_webXmlRoot.isOrdered())
{
Ordering ordering = getOrdering();
if (ordering == null)
ordering = new AbsoluteOrdering(this);
List order = _webXmlRoot.getOrdering();
for (String s : order)
{
if (s.equalsIgnoreCase("others"))
((AbsoluteOrdering)ordering).addOthers();
else
((AbsoluteOrdering)ordering).add(s);
}
//(re)set the ordering to cause webinf jar order to be recalculated
setOrdering(ordering);
}
}
/**
* Add a override-web.xml descriptor.
*
* @param descriptor the override-web.xml
*/
public void addOverrideDescriptor(OverrideDescriptor descriptor)
throws Exception
{
descriptor.parse(WebDescriptor.getParser(isValidateXml()));
switch (descriptor.getMetaDataComplete())
{
case True:
_metaDataComplete = true;
break;
case False:
_metaDataComplete = false;
break;
default:
break;
}
if (descriptor.isOrdered())
{
Ordering ordering = getOrdering();
if (ordering == null)
ordering = new AbsoluteOrdering(this);
List order = descriptor.getOrdering();
for (String s : order)
{
if (s.equalsIgnoreCase("others"))
((AbsoluteOrdering)ordering).addOthers();
else
((AbsoluteOrdering)ordering).add(s);
}
//set or reset the ordering to cause the webinf jar ordering to be recomputed
setOrdering(ordering);
}
_webOverrideRoots.add(descriptor);
}
/**
* Add a web-fragment.xml, and the jar it is contained in.
*
* @param jarResource the jar of the fragment
* @param descriptor web-fragment.xml
* @throws Exception if unable to add fragment
*/
public void addFragmentDescriptor(Resource jarResource, FragmentDescriptor descriptor)
throws Exception
{
if (_metaDataComplete)
return; //do not process anything else if web.xml/web-override.xml set metadata-complete
Objects.requireNonNull(jarResource);
Objects.requireNonNull(descriptor);
//Metadata-complete is not set, or there is no web.xml
_webFragmentResourceMap.put(jarResource, descriptor);
_webFragmentRoots.add(descriptor);
descriptor.parse(WebDescriptor.getParser(isValidateXml()));
if (descriptor.getName() != null)
{
Descriptor existing = _webFragmentNameMap.get(descriptor.getName());
if (existing != null && !isAllowDuplicateFragmentNames())
{
throw new IllegalStateException("Duplicate fragment name: " + descriptor.getName() + " for " + existing.getResource() + " and " + descriptor.getResource());
}
else
_webFragmentNameMap.put(descriptor.getName(), descriptor);
}
//only accept an ordering from the fragment if there is no ordering already established
if (_ordering == null && descriptor.isOrdered())
{
setOrdering(new RelativeOrdering(this));
return;
}
//recompute the ordering with the new fragment name
orderFragments();
}
/**
* Annotations such as WebServlet, WebFilter, WebListener that
* can be discovered by scanning unloaded classes.
*
* @param annotations the list of discovered annotations to add
*/
public void addDiscoveredAnnotations(List annotations)
{
if (annotations == null)
return;
for (DiscoveredAnnotation a : annotations)
{
addDiscoveredAnnotation(a);
}
}
/**
* Add an annotation that has been discovered on a class, method or field within a resource
* eg a jar or dir. The annotation may also have no associated resource, or that resource
* may be a system or container resource.
*
* This method is synchronized as it is anticipated that it may be called by many threads
* during the annotation scanning phase.
*
* @param annotation the discovered annotation
*/
public void addDiscoveredAnnotation(DiscoveredAnnotation annotation)
{
if (annotation == null)
return;
try (AutoLock l = _lock.lock())
{
//if no resource associated with an annotation map it to empty resource - these
//annotations will always be processed first
Resource enclosingResource = EmptyResource.INSTANCE;
Resource resource = annotation.getResource();
if (resource != null)
{
//check if any of the web-inf classes dirs is a parent
enclosingResource = getEnclosingResource(_webInfClasses, resource);
//check if any of the web-inf jars is a parent
if (enclosingResource == null)
enclosingResource = getEnclosingResource(_webInfJars, resource);
//check if any of the container resources is a parent
if (enclosingResource == null)
enclosingResource = getEnclosingResource(_orderedContainerResources, resource);
//Couldn't find a parent resource in any of the known resources, map it to the empty resource
if (enclosingResource == null)
enclosingResource = EmptyResource.INSTANCE;
}
List list = _annotations.computeIfAbsent(enclosingResource, k -> new ArrayList<>());
list.add(annotation);
}
}
/**
* Check if the resource is contained within one of the list of resources.
* In other words, check if the given resource is a sub-resource of one
* of the list of resources.
*
* @param resources the list of resources to check against
* @param resource the resource for which to find the parent resource
* @return the resource from the list that contains the given resource.
*/
private Resource getEnclosingResource(List resources, Resource resource)
{
Resource enclosingResource = null;
try
{
for (Resource r : resources)
{
if (Resource.isContainedIn(resource, r))
{
enclosingResource = r;
break;
}
}
return enclosingResource;
}
catch (Exception e)
{
LOG.warn("Not contained within?", e);
return null;
}
}
public void addDescriptorProcessor(DescriptorProcessor p)
{
_descriptorProcessors.add(p);
}
public void removeDescriptorProcessor(DescriptorProcessor p)
{
_descriptorProcessors.remove(p);
}
public void orderFragments()
{
_orderedWebInfResources.clear();
if (getOrdering() != null)
_orderedWebInfResources.addAll(getOrdering().order(_webInfJars));
}
/**
* Resolve all servlet/filter/listener metadata from all sources: descriptors and annotations.
*
* @param context the context to resolve servlets / filters / listeners metadata from
* @throws Exception if unable to resolve metadata
*/
public void resolve(WebAppContext context)
throws Exception
{
LOG.debug("metadata resolve {}", context);
//Ensure origins is fresh
_origins.clear();
// Set the ordered lib attribute
List orderedWebInfJars = null;
if (isOrdered())
{
orderedWebInfJars = getWebInfResources(true);
List orderedLibs = new ArrayList<>();
for (Resource webInfJar : orderedWebInfJars)
{
//get just the name of the jar file
String fullname = webInfJar.getName();
int i = fullname.indexOf(".jar");
int j = fullname.lastIndexOf("/", i);
orderedLibs.add(fullname.substring(j + 1, i + 4));
}
context.setAttribute(ServletContext.ORDERED_LIBS, Collections.unmodifiableList(orderedLibs));
}
// set the webxml version
if (_webXmlRoot != null)
{
context.getServletContext().setEffectiveMajorVersion(_webXmlRoot.getMajorVersion());
context.getServletContext().setEffectiveMinorVersion(_webXmlRoot.getMinorVersion());
}
//process web-defaults.xml, web.xml and override-web.xmls
for (DescriptorProcessor p : _descriptorProcessors)
{
p.process(context, getDefaultsDescriptor());
p.process(context, getWebDescriptor());
for (WebDescriptor wd : getOverrideDescriptors())
{
LOG.debug("process {} {} {}", context, p, wd);
p.process(context, wd);
}
}
List resources = new ArrayList<>();
resources.add(EmptyResource.INSTANCE); //always apply annotations with no resource first
resources.addAll(_orderedContainerResources); //next all annotations from container path
resources.addAll(_webInfClasses); //next everything from web-inf classes
resources.addAll(getWebInfResources(isOrdered())); //finally annotations (in order) from webinf path
for (Resource r : resources)
{
//Process the web-fragment.xml before applying annotations from a fragment.
//Note that some fragments, or resources that aren't fragments won't have
//a descriptor.
FragmentDescriptor fd = _webFragmentResourceMap.get(r);
if (fd != null)
{
for (DescriptorProcessor p : _descriptorProcessors)
{
LOG.debug("process {} {}", context, fd);
p.process(context, fd);
}
}
//Then apply the annotations - note that if metadata is complete
//either overall or for a fragment, those annotations won't have
//been discovered.
List annotations = _annotations.get(r);
if (annotations != null)
{
for (DiscoveredAnnotation a : annotations)
{
LOG.debug("apply {}", a);
a.apply();
}
}
}
}
/**
* A webapp is distributable if web.xml is metadata-complete and
* distributable=true, or if metadata-complete is false, but all
* web-fragments.xml are distributable=true.
*
* @return true if the webapp is distributable, false otherwise
*/
public boolean isDistributable()
{
boolean distributable = (
(_webDefaultsRoot != null && _webDefaultsRoot.isDistributable()) ||
(_webXmlRoot != null && _webXmlRoot.isDistributable()));
for (WebDescriptor d : _webOverrideRoots)
{
distributable &= d.isDistributable();
}
if (isOrdered())
{
List orderedResources = getWebInfResources(true);
for (Resource r : orderedResources)
{
FragmentDescriptor d = _webFragmentResourceMap.get(r);
if (d != null)
distributable = distributable && d.isDistributable();
}
}
return distributable;
}
public WebDescriptor getWebDescriptor()
{
return _webXmlRoot;
}
public List getOverrideDescriptors()
{
return _webOverrideRoots;
}
public WebDescriptor getDefaultsDescriptor()
{
return _webDefaultsRoot;
}
public boolean isOrdered()
{
return getOrdering() != null;
}
public Ordering getOrdering()
{
return _ordering;
}
public void setOrdering(Ordering o)
{
_ordering = o;
orderFragments();
}
/**
* @param name the name specified in a web-fragment.xml
* @return the web-fragment.xml that defines that name or null
*/
public FragmentDescriptor getFragmentDescriptor(String name)
{
return _webFragmentNameMap.get(name);
}
/**
* @param descriptorResource the web-fragment.xml location as a Resource
* @return the FrgmentDescriptor for the web-fragment.xml, or null if none exists
*/
public FragmentDescriptor getFragmentDescriptor(Resource descriptorResource)
{
return _webFragmentRoots.stream().filter(d -> d.getResource().equals(descriptorResource)).findFirst().orElse(null);
}
/**
* @param name the name specified in a web-fragment.xml
* @return the jar that contains the web-fragment.xml with the given name or null
*/
public Resource getJarForFragmentName(String name)
{
FragmentDescriptor f = getFragmentDescriptor(name);
if (f == null)
return null;
Resource jar = null;
for (Map.Entry entry : _webFragmentResourceMap.entrySet())
{
if (entry.getValue().equals(f))
jar = entry.getKey();
}
return jar;
}
/**
* Get the web-fragment.xml related to a jar
*
* @param jar the jar to check for a mapping to web-fragment.xml
* @return the FragmentDescriptor or null if no web-fragment.xml is associated with the jar
*/
public FragmentDescriptor getFragmentDescriptorForJar(Resource jar)
{
return _webFragmentResourceMap.get(jar);
}
/**
* @return a map of name to FragmentDescriptor, for those FragmentDescriptors that
* define a name element.
*/
public Map getNamedFragmentDescriptors()
{
return Collections.unmodifiableMap(_webFragmentNameMap);
}
public Origin getOrigin(String name)
{
OriginInfo x = _origins.get(name);
if (x == null)
return Origin.NotSet;
return x.getOriginType();
}
public OriginInfo getOriginInfo(String name)
{
OriginInfo x = _origins.get(name);
if (x == null)
return null;
return x;
}
public Descriptor getOriginDescriptor(String name)
{
OriginInfo o = _origins.get(name);
if (o == null)
return null;
return o.getDescriptor();
}
public void setOrigin(String name, Descriptor d)
{
if (name == null)
return;
OriginInfo x = new OriginInfo(name, d);
_origins.put(name, x);
}
public void setOrigin(String name, Annotation annotation, Class annotated)
{
if (name == null)
return;
OriginInfo x = new OriginInfo(name, annotation, annotated);
_origins.put(name, x);
}
public void setOriginAPI(String name)
{
if (name == null)
return;
OriginInfo x = new OriginInfo(name);
_origins.put(name, x);
}
public boolean isMetaDataComplete()
{
return _metaDataComplete;
}
public void addWebInfResource(Resource newResource)
{
_webInfJars.add(newResource);
}
public List getWebInfResources(boolean withOrdering)
{
if (!withOrdering)
return Collections.unmodifiableList(_webInfJars);
else
return Collections.unmodifiableList(_orderedWebInfResources);
}
public List getContainerResources()
{
return Collections.unmodifiableList(_orderedContainerResources);
}
public void addContainerResource(Resource jar)
{
_orderedContainerResources.add(jar);
}
public void setWebInfClassesResources(List dirs)
{
_webInfClasses.addAll(dirs);
}
public List getWebInfClassesResources()
{
return Collections.unmodifiableList(_webInfClasses);
}
public boolean isAllowDuplicateFragmentNames()
{
return _allowDuplicateFragmentNames;
}
public void setAllowDuplicateFragmentNames(boolean allowDuplicateFragmentNames)
{
_allowDuplicateFragmentNames = allowDuplicateFragmentNames;
}
/**
* @return true if the parser validates, false otherwise
*/
public boolean isValidateXml()
{
return _validateXml;
}
/**
* @param validateXml if true xml syntax is validated by the parser, false otherwise
*/
public void setValidateXml(boolean validateXml)
{
_validateXml = validateXml;
}
public Map getOrigins()
{
return Collections.unmodifiableMap(_origins);
}
}