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//
// ========================================================================
// Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.annotations;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import javax.servlet.Servlet;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import org.eclipse.jetty.servlet.Holder;
import org.eclipse.jetty.servlet.ServletHolder;
import org.eclipse.jetty.servlet.ServletMapping;
import org.eclipse.jetty.util.ArrayUtil;
import org.eclipse.jetty.util.LazyList;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.Resource;
import org.eclipse.jetty.webapp.DiscoveredAnnotation;
import org.eclipse.jetty.webapp.MetaData;
import org.eclipse.jetty.webapp.Origin;
import org.eclipse.jetty.webapp.WebAppContext;
/**
* WebServletAnnotation
*
*
*/
public class WebServletAnnotation extends DiscoveredAnnotation
{
private static final Logger LOG = Log.getLogger(WebServletAnnotation.class);
public WebServletAnnotation (WebAppContext context, String className)
{
super(context, className);
}
public WebServletAnnotation (WebAppContext context, String className, Resource resource)
{
super(context, className, resource);
}
/**
* @see DiscoveredAnnotation#apply()
*/
public void apply()
{
//TODO check this algorithm with new rules for applying descriptors and annotations in order
Class clazz = (Class)getTargetClass();
if (clazz == null)
{
LOG.warn(_className+" cannot be loaded");
return;
}
//Servlet Spec 8.1.1
if (!HttpServlet.class.isAssignableFrom(clazz))
{
LOG.warn(clazz.getName()+" is not assignable from javax.servlet.http.HttpServlet");
return;
}
WebServlet annotation = (WebServlet)clazz.getAnnotation(WebServlet.class);
if (annotation.urlPatterns().length > 0 && annotation.value().length > 0)
{
LOG.warn(clazz.getName()+ " defines both @WebServlet.value and @WebServlet.urlPatterns");
return;
}
String[] urlPatterns = annotation.value();
if (urlPatterns.length == 0)
urlPatterns = annotation.urlPatterns();
if (urlPatterns.length == 0)
{
LOG.warn(clazz.getName()+ " defines neither @WebServlet.value nor @WebServlet.urlPatterns");
return;
}
//canonicalize the patterns
ArrayList urlPatternList = new ArrayList();
for (String p : urlPatterns)
urlPatternList.add(Util.normalizePattern(p));
String servletName = (annotation.name().equals("")?clazz.getName():annotation.name());
MetaData metaData = _context.getMetaData();
ServletMapping mapping = null; //the new mapping
//Find out if a already exists with this name
ServletHolder[] holders = _context.getServletHandler().getServlets();
ServletHolder holder = null;
if (holders != null)
{
for (ServletHolder h : holders)
{
if (h.getName() != null && servletName.equals(h.getName()))
{
holder = h;
break;
}
}
}
//handle creation/completion of a servlet
if (holder == null)
{
//No servlet of this name has already been defined, either by a descriptor
//or another annotation (which would be impossible).
holder = _context.getServletHandler().newServletHolder(Holder.Source.ANNOTATION);
holder.setHeldClass(clazz);
metaData.setOrigin(servletName+".servlet.servlet-class",annotation,clazz);
holder.setName(servletName);
holder.setDisplayName(annotation.displayName());
metaData.setOrigin(servletName+".servlet.display-name",annotation,clazz);
holder.setInitOrder(annotation.loadOnStartup());
metaData.setOrigin(servletName+".servlet.load-on-startup",annotation,clazz);
holder.setAsyncSupported(annotation.asyncSupported());
metaData.setOrigin(servletName+".servlet.async-supported",annotation,clazz);
for (WebInitParam ip:annotation.initParams())
{
holder.setInitParameter(ip.name(), ip.value());
metaData.setOrigin(servletName+".servlet.init-param."+ip.name(),ip,clazz);
}
_context.getServletHandler().addServlet(holder);
mapping = new ServletMapping();
mapping.setServletName(holder.getName());
mapping.setPathSpecs( LazyList.toStringArray(urlPatternList));
}
else
{
//set the class according to the servlet that is annotated, if it wasn't already
//NOTE: this may be considered as "completing" an incomplete servlet registration, and it is
//not clear from servlet 3.0 spec whether this is intended, or if only a ServletContext.addServlet() call
//can complete it, see http://java.net/jira/browse/SERVLET_SPEC-42
if (holder.getClassName() == null)
holder.setClassName(clazz.getName());
if (holder.getHeldClass() == null)
holder.setHeldClass(clazz);
//check if the existing servlet has each init-param from the annotation
//if not, add it
for (WebInitParam ip:annotation.initParams())
{
if (metaData.getOrigin(servletName+".servlet.init-param."+ip.name())==Origin.NotSet)
{
holder.setInitParameter(ip.name(), ip.value());
metaData.setOrigin(servletName+".servlet.init-param."+ip.name(),ip,clazz);
}
}
//check the url-patterns
//ServletSpec 3.0 p81 If a servlet already has url mappings from a
//webxml or fragment descriptor the annotation is ignored.
//However, we want to be able to replace mappings that were given in webdefault.xml
List existingMappings = getServletMappingsForServlet(servletName);
//if any mappings for this servlet already set by a descriptor that is not webdefault.xml forget
//about processing these url mappings
if (existingMappings.isEmpty() || !containsNonDefaultMappings(existingMappings))
{
mapping = new ServletMapping();
mapping.setServletName(servletName);
mapping.setPathSpecs(LazyList.toStringArray(urlPatternList));
}
}
//We also want to be able to replace mappings that were defined in webdefault.xml
//that were for a different servlet eg a mapping in webdefault.xml for / to the jetty
//default servlet should be able to be replaced by an annotation for / to a different
//servlet
if (mapping != null)
{
//url mapping was permitted by annotation processing rules
//take a copy of the existing servlet mappings that we can iterate over and remove from. This is
//because the ServletHandler interface does not support removal of individual mappings.
List allMappings = ArrayUtil.asMutableList(_context.getServletHandler().getServletMappings());
//for each of the urls in the annotation, check if a mapping to same/different servlet exists
// if mapping exists and is from a default descriptor, it can be replaced. NOTE: we do not
// guard against duplicate path mapping here: that is the job of the ServletHandler
for (String p:urlPatternList)
{
ServletMapping existingMapping = _context.getServletHandler().getServletMapping(p);
if (existingMapping != null && existingMapping.isDefault())
{
String[] updatedPaths = ArrayUtil.removeFromArray(existingMapping.getPathSpecs(), p);
//if we removed the last path from a servletmapping, delete the servletmapping
if (updatedPaths == null || updatedPaths.length == 0)
{
boolean success = allMappings.remove(existingMapping);
if (LOG.isDebugEnabled()) LOG.debug("Removed empty mapping {} from defaults descriptor success:{}",existingMapping, success);
}
else
{
existingMapping.setPathSpecs(updatedPaths);
if (LOG.isDebugEnabled()) LOG.debug("Removed path {} from mapping {} from defaults descriptor ", p,existingMapping);
}
}
_context.getMetaData().setOrigin(servletName+".servlet.mapping."+p, annotation, clazz);
}
allMappings.add(mapping);
_context.getServletHandler().setServletMappings(allMappings.toArray(new ServletMapping[allMappings.size()]));
}
}
/**
* @param name
* @return
*/
private List getServletMappingsForServlet (String name)
{
ServletMapping[] allMappings = _context.getServletHandler().getServletMappings();
if (allMappings == null)
return Collections.emptyList();
List mappings = new ArrayList();
for (ServletMapping m:allMappings)
{
if (m.getServletName() != null && name.equals(m.getServletName()))
{
mappings.add(m);
}
}
return mappings;
}
/**
* @param mappings
* @return
*/
private boolean containsNonDefaultMappings (List mappings)
{
if (mappings == null)
return false;
for (ServletMapping m:mappings)
{
if (!m.isDefault())
return true;
}
return false;
}
}
