//
// ========================================================================
// Copyright (c) 1995-2017 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.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import org.eclipse.jetty.util.ConcurrentHashSet;
import org.eclipse.jetty.util.Loader;
import org.eclipse.jetty.util.MultiException;
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.JarScanner;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* AnnotationParser
* <p>
* Use asm to scan classes for annotations. A SAX-style parsing is done.
* Handlers are registered which will be called back when various types of
* entity are encountered, eg a class, a method, a field.
* <p>
* Handlers are not called back in any particular order and are assumed
* to be order-independent.
* <p>
* As a registered Handler will be called back for each annotation discovered
* on a class, a method, a field, the Handler should test to see if the annotation
* is one that it is interested in.
* <p>
* For the servlet spec, we are only interested in annotations on classes, methods and fields,
* so the callbacks for handling finding a class, a method a field are themselves
* not fully implemented.
*/
public class AnnotationParser
{
private static final Logger LOG = Log.getLogger(AnnotationParser.class);
protected Set<String> _parsedClassNames = new ConcurrentHashSet<String>();
protected static int ASM_OPCODE_VERSION = Opcodes.ASM5; //compatibility of api
/**
* Convert internal name to simple name
*
* @param name the internal name
* @return the simple name
*/
public static String normalize (String name)
{
if (name==null)
return null;
if (name.startsWith("L") && name.endsWith(";"))
name = name.substring(1, name.length()-1);
if (name.endsWith(".class"))
name = name.substring(0, name.length()-".class".length());
return name.replace('/', '.');
}
/**
* Convert internal names to simple names.
*
* @param list the list of internal names
* @return the list of simple names
*/
public static String[] normalize (String[] list)
{
if (list == null)
return null;
String[] normalList = new String[list.length];
int i=0;
for (String s : list)
normalList[i++] = normalize(s);
return normalList;
}
/**
* ClassInfo
*
* Immutable information gathered by parsing class header.
*
*/
public class ClassInfo
{
final Resource _containingResource;
final String _className;
final int _version;
final int _access;
final String _signature;
final String _superName;
final String[] _interfaces;
public ClassInfo(Resource resource, String className, int version, int access, String signature, String superName, String[] interfaces)
{
super();
_containingResource = resource;
_className = className;
_version = version;
_access = access;
_signature = signature;
_superName = superName;
_interfaces = interfaces;
}
public String getClassName()
{
return _className;
}
public int getVersion()
{
return _version;
}
public int getAccess()
{
return _access;
}
public String getSignature()
{
return _signature;
}
public String getSuperName()
{
return _superName;
}
public String[] getInterfaces()
{
return _interfaces;
}
public Resource getContainingResource()
{
return _containingResource;
}
}
/**
* MethodInfo
*
* Immutable information gathered by parsing a method on a class.
*/
public class MethodInfo
{
final ClassInfo _classInfo;
final String _methodName;
final int _access;
final String _desc;
final String _signature;
final String[] _exceptions;
public MethodInfo(ClassInfo classInfo, String methodName, int access, String desc, String signature, String[] exceptions)
{
super();
_classInfo = classInfo;
_methodName = methodName;
_access = access;
_desc = desc;
_signature = signature;
_exceptions = exceptions;
}
public ClassInfo getClassInfo()
{
return _classInfo;
}
public String getMethodName()
{
return _methodName;
}
public int getAccess()
{
return _access;
}
public String getDesc()
{
return _desc;
}
public String getSignature()
{
return _signature;
}
public String[] getExceptions()
{
return _exceptions;
}
}
/**
* FieldInfo
*
* Immutable information gathered by parsing a field on a class.
*
*/
public class FieldInfo
{
final ClassInfo _classInfo;
final String _fieldName;
final int _access;
final String _fieldType;
final String _signature;
final Object _value;
public FieldInfo(ClassInfo classInfo, String fieldName, int access, String fieldType, String signature, Object value)
{
super();
_classInfo = classInfo;
_fieldName = fieldName;
_access = access;
_fieldType = fieldType;
_signature = signature;
_value = value;
}
public ClassInfo getClassInfo()
{
return _classInfo;
}
public String getFieldName()
{
return _fieldName;
}
public int getAccess()
{
return _access;
}
public String getFieldType()
{
return _fieldType;
}
public String getSignature()
{
return _signature;
}
public Object getValue()
{
return _value;
}
}
/**
* Handler
*
* Signature for all handlers that respond to parsing class files.
*/
public static interface Handler
{
public void handle(ClassInfo classInfo);
public void handle(MethodInfo methodInfo);
public void handle (FieldInfo fieldInfo);
public void handle (ClassInfo info, String annotationName);
public void handle (MethodInfo info, String annotationName);
public void handle (FieldInfo info, String annotationName);
}
/**
* AbstractHandler
*
* Convenience base class to provide no-ops for all Handler methods.
*/
public static abstract class AbstractHandler implements Handler
{
@Override
public void handle(ClassInfo classInfo)
{
//no-op
}
@Override
public void handle(MethodInfo methodInfo)
{
// no-op
}
@Override
public void handle(FieldInfo fieldInfo)
{
// no-op
}
@Override
public void handle(ClassInfo info, String annotationName)
{
// no-op
}
@Override
public void handle(MethodInfo info, String annotationName)
{
// no-op
}
@Override
public void handle(FieldInfo info, String annotationName)
{
// no-op
}
}
/**
* MyMethodVisitor
*
* ASM Visitor for parsing a method. We are only interested in the annotations on methods.
*/
public class MyMethodVisitor extends MethodVisitor
{
final MethodInfo _mi;
final Set<? extends Handler> _handlers;
public MyMethodVisitor(final Set<? extends Handler> handlers,
final ClassInfo classInfo,
final int access,
final String name,
final String methodDesc,
final String signature,
final String[] exceptions)
{
super(ASM_OPCODE_VERSION);
_handlers = handlers;
_mi = new MethodInfo(classInfo, name, access, methodDesc,signature, exceptions);
}
/**
* We are only interested in finding the annotations on methods.
*
* @see org.objectweb.asm.MethodVisitor#visitAnnotation(java.lang.String, boolean)
*/
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible)
{
String annotationName = normalize(desc);
for (Handler h:_handlers)
h.handle(_mi, annotationName);
return null;
}
}
/**
* MyFieldVisitor
*
* An ASM visitor for parsing Fields.
* We are only interested in visiting annotations on Fields.
*
*/
public class MyFieldVisitor extends FieldVisitor
{
final FieldInfo _fieldInfo;
final Set<? extends Handler> _handlers;
public MyFieldVisitor(final Set<? extends Handler> handlers,
final ClassInfo classInfo,
final int access,
final String fieldName,
final String fieldType,
final String signature,
final Object value)
{
super(ASM_OPCODE_VERSION);
_handlers = handlers;
_fieldInfo = new FieldInfo(classInfo, fieldName, access, fieldType, signature, value);
}
/**
* Parse an annotation found on a Field.
*
* @see org.objectweb.asm.FieldVisitor#visitAnnotation(java.lang.String, boolean)
*/
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible)
{
String annotationName = normalize(desc);
for (Handler h : _handlers)
h.handle(_fieldInfo, annotationName);
return null;
}
}
/**
* MyClassVisitor
*
* ASM visitor for a class.
*/
public class MyClassVisitor extends ClassVisitor
{
final Resource _containingResource;
final Set<? extends Handler> _handlers;
ClassInfo _ci;
public MyClassVisitor(Set<? extends Handler> handlers, Resource containingResource)
{
super(ASM_OPCODE_VERSION);
_handlers = handlers;
_containingResource = containingResource;
}
@Override
public void visit (final int version,
final int access,
final String name,
final String signature,
final String superName,
final String[] interfaces)
{
_ci = new ClassInfo(_containingResource, normalize(name), version, access, signature, normalize(superName), normalize(interfaces));
_parsedClassNames.add(_ci.getClassName());
for (Handler h:_handlers)
h.handle(_ci);
}
/**
* Visit an annotation on a Class
*
* @see org.objectweb.asm.ClassVisitor#visitAnnotation(java.lang.String, boolean)
*/
@Override
public AnnotationVisitor visitAnnotation (String desc, boolean visible)
{
String annotationName = normalize(desc);
for (Handler h : _handlers)
h.handle(_ci, annotationName);
return null;
}
/**
* Visit a method to extract its annotations
*
* @see org.objectweb.asm.ClassVisitor#visitMethod(int, java.lang.String, java.lang.String, java.lang.String, java.lang.String[])
*/
@Override
public MethodVisitor visitMethod (final int access,
final String name,
final String methodDesc,
final String signature,
final String[] exceptions)
{
return new MyMethodVisitor(_handlers, _ci, access, name, methodDesc, signature, exceptions);
}
/**
* Visit a field to extract its annotations
*
* @see org.objectweb.asm.ClassVisitor#visitField(int, java.lang.String, java.lang.String, java.lang.String, java.lang.Object)
*/
@Override
public FieldVisitor visitField (final int access,
final String fieldName,
final String fieldType,
final String signature,
final Object value)
{
return new MyFieldVisitor(_handlers, _ci, access, fieldName, fieldType, signature, value);
}
}
/**
* True if the class has already been processed, false otherwise
* @param className the classname
* @return true if class was parsed, false if not
*/
public boolean isParsed (String className)
{
return _parsedClassNames.contains(className);
}
/**
* Parse a given class
*
* @param handlers the set of handlers to find class
* @param className the class name to parse
* @throws Exception if unable to parse
*/
public void parse (Set<? extends Handler> handlers, String className)
throws Exception
{
if (className == null)
return;
if (!isParsed(className))
{
className = className.replace('.', '/')+".class";
URL resource = Loader.getResource(className);
if (resource!= null)
{
Resource r = Resource.newResource(resource);
try (InputStream is = r.getInputStream())
{
scanClass(handlers, null, is);
}
}
}
}
/**
* Parse the given class, optionally walking its inheritance hierarchy
*
* @param handlers the handlers to look for class in
* @param clazz the class to look for
* @param visitSuperClasses if true, also visit super classes for parse
* @throws Exception if unable to parse class
*/
public void parse (Set<? extends Handler> handlers, Class<?> clazz, boolean visitSuperClasses)
throws Exception
{
Class<?> cz = clazz;
while (cz != Object.class)
{
if (!isParsed(cz.getName()))
{
String nameAsResource = cz.getName().replace('.', '/')+".class";
URL resource = Loader.getResource(nameAsResource);
if (resource!= null)
{
Resource r = Resource.newResource(resource);
try (InputStream is = r.getInputStream())
{
scanClass(handlers, null, is);
}
}
}
if (visitSuperClasses)
cz = cz.getSuperclass();
else
break;
}
}
/**
* Parse the given classes
*
* @param handlers the set of handlers to look for class in
* @param classNames the class name
* @throws Exception if unable to parse
*/
public void parse (Set<? extends Handler> handlers, String[] classNames)
throws Exception
{
if (classNames == null)
return;
parse(handlers, Arrays.asList(classNames));
}
/**
* Parse the given classes
*
* @param handlers the set of handlers to look for class in
* @param classNames the class names
* @throws Exception if unable to parse
*/
public void parse (Set<? extends Handler> handlers, List<String> classNames)
throws Exception
{
MultiException me = new MultiException();
for (String s:classNames)
{
try
{
if (!isParsed(s))
{
s = s.replace('.', '/')+".class";
URL resource = Loader.getResource(s);
if (resource!= null)
{
Resource r = Resource.newResource(resource);
try (InputStream is = r.getInputStream())
{
scanClass(handlers, null, is);
}
}
}
}
catch (Exception e)
{
me.add(new RuntimeException("Error scanning class "+s, e));
}
}
me.ifExceptionThrow();
}
/**
* Parse all classes in a directory
*
* @param handlers the set of handlers to look for classes in
* @param dir the resource directory to look for classes
* @throws Exception if unable to parse
*/
protected void parseDir (Set<? extends Handler> handlers, Resource dir)
throws Exception
{
// skip dirs whose name start with . (ie hidden)
if (!dir.isDirectory() || !dir.exists() || dir.getName().startsWith("."))
return;
if (LOG.isDebugEnabled()) {LOG.debug("Scanning dir {}", dir);};
MultiException me = new MultiException();
String[] files=dir.list();
for (int f=0;files!=null && f<files.length;f++)
{
Resource res = dir.addPath(files[f]);
if (res.isDirectory())
parseDir(handlers, res);
else
{
//we've already verified the directories, so just verify the class file name
File file = res.getFile();
if (isValidClassFileName((file==null?null:file.getName())))
{
try
{
String name = res.getName();
if (!isParsed(name))
{
Resource r = Resource.newResource(res.getURL());
if (LOG.isDebugEnabled()) {LOG.debug("Scanning class {}", r);};
try (InputStream is=r.getInputStream())
{
scanClass(handlers, dir, is);
}
}
}
catch (Exception ex)
{
if (LOG.isDebugEnabled()) LOG.debug("Error scanning file "+files[f], ex);
me.add(new RuntimeException("Error scanning file "+files[f],ex));
}
}
else
{
if (LOG.isDebugEnabled()) LOG.debug("Skipping scan on invalid file {}", res);
}
}
}
me.ifExceptionThrow();
}
/**
* Parse classes in the supplied classloader.
* Only class files in jar files will be scanned.
*
* @param handlers the handlers to look for classes in
* @param loader the classloader for the classes
* @param visitParents if true, visit parent classloaders too
* @param nullInclusive if true, an empty pattern means all names match, if false, none match
* @throws Exception if unable to parse
*/
public void parse (final Set<? extends Handler> handlers, ClassLoader loader, boolean visitParents, boolean nullInclusive)
throws Exception
{
if (loader==null)
return;
if (!(loader instanceof URLClassLoader))
return; //can't extract classes?
final MultiException me = new MultiException();
JarScanner scanner = new JarScanner()
{
@Override
public void processEntry(URI jarUri, JarEntry entry)
{
try
{
parseJarEntry(handlers, Resource.newResource(jarUri), entry);
}
catch (Exception e)
{
me.add(new RuntimeException("Error parsing entry "+entry.getName()+" from jar "+ jarUri, e));
}
}
};
scanner.scan(null, loader, nullInclusive, visitParents);
me.ifExceptionThrow();
}
/**
* Parse classes in the supplied uris.
*
* @param handlers the handlers to look for classes in
* @param uris the uris for the jars
* @throws Exception if unable to parse
*/
public void parse (final Set<? extends Handler> handlers, final URI[] uris)
throws Exception
{
if (uris==null)
return;
MultiException me = new MultiException();
for (URI uri:uris)
{
try
{
parse(handlers, uri);
}
catch (Exception e)
{
me.add(new RuntimeException("Problem parsing classes from "+ uri, e));
}
}
me.ifExceptionThrow();
}
/**
* Parse a particular uri
*
* @param handlers the handlers to look for classes in
* @param uri the uri for the jar
* @throws Exception if unable to parse
*/
public void parse (final Set<? extends Handler> handlers, URI uri)
throws Exception
{
if (uri == null)
return;
parse (handlers, Resource.newResource(uri));
}
/**
* Parse a resource
*
* @param handlers the handlers to look for classes in
* @param r the resource to parse
* @throws Exception if unable to parse
*/
public void parse (final Set<? extends Handler> handlers, Resource r)
throws Exception
{
if (r == null)
return;
if (r.exists() && r.isDirectory())
{
parseDir(handlers, r);
return;
}
String fullname = r.toString();
if (fullname.endsWith(".jar"))
{
parseJar(handlers, r);
return;
}
if (fullname.endsWith(".class"))
{
try (InputStream is=r.getInputStream())
{
scanClass(handlers, null, is);
return;
}
}
if (LOG.isDebugEnabled()) LOG.warn("Resource not scannable for classes: {}", r);
}
/**
* Parse a resource that is a jar file.
*
* @param handlers the handlers to look for classes in
* @param jarResource the jar resource to parse
* @throws Exception if unable to parse
*/
protected void parseJar (Set<? extends Handler> handlers, Resource jarResource)
throws Exception
{
if (jarResource == null)
return;
if (jarResource.toString().endsWith(".jar"))
{
if (LOG.isDebugEnabled()) {LOG.debug("Scanning jar {}", jarResource);};
//treat it as a jar that we need to open and scan all entries from
InputStream in = jarResource.getInputStream();
if (in==null)
return;
MultiException me = new MultiException();
JarInputStream jar_in = new JarInputStream(in);
try
{
JarEntry entry = jar_in.getNextJarEntry();
while (entry!=null)
{
try
{
parseJarEntry(handlers, jarResource, entry);
}
catch (Exception e)
{
me.add(new RuntimeException("Error scanning entry "+entry.getName()+" from jar "+jarResource, e));
}
entry = jar_in.getNextJarEntry();
}
}
catch (Exception e)
{
me.add(new RuntimeException("Error scanning jar "+jarResource, e));
}
finally
{
jar_in.close();
}
me.ifExceptionThrow();
}
}
/**
* Parse a single entry in a jar file
*
* @param handlers the handlers to look for classes in
* @param jar the jar resource to parse
* @param entry the entry in the jar resource to parse
* @throws Exception if unable to parse
*/
protected void parseJarEntry (Set<? extends Handler> handlers, Resource jar, JarEntry entry)
throws Exception
{
if (jar == null || entry == null)
return;
//skip directories
if (entry.isDirectory())
return;
String name = entry.getName();
//check file is a valid class file name
if (isValidClassFileName(name) && isValidClassFilePath(name))
{
String shortName = name.replace('/', '.').substring(0,name.length()-6);
if (!isParsed(shortName))
{
Resource clazz = Resource.newResource("jar:"+jar.getURI()+"!/"+name);
if (LOG.isDebugEnabled()) {LOG.debug("Scanning class from jar {}", clazz);};
try (InputStream is = clazz.getInputStream())
{
scanClass(handlers, jar, is);
}
}
}
}
/**
* Use ASM on a class
*
* @param handlers the handlers to look for classes in
* @param containingResource the dir or jar that the class is contained within, can be null if not known
* @param is the input stream to parse
* @throws IOException if unable to parse
*/
protected void scanClass (Set<? extends Handler> handlers, Resource containingResource, InputStream is)
throws IOException
{
ClassReader reader = new ClassReader(is);
reader.accept(new MyClassVisitor(handlers, containingResource), ClassReader.SKIP_CODE|ClassReader.SKIP_DEBUG|ClassReader.SKIP_FRAMES);
}
/**
* Check that the given path represents a valid class file name.
* The check is fairly cursory, checking that:
* <ul>
* <li> the name ends with .class</li>
* <li> it isn't a dot file or in a hidden directory </li>
* <li> the name of the class at least begins with a valid identifier for a class name </li>
* </ul>
* @param name
* @return
*/
private boolean isValidClassFileName (String name)
{
//no name cannot be valid
if (name == null || name.length()==0)
return false;
//skip anything that is not a class file
if (!name.toLowerCase(Locale.ENGLISH).endsWith(".class"))
{
if (LOG.isDebugEnabled()) LOG.debug("Not a class: {}",name);
return false;
}
//skip any classfiles that are not a valid java identifier
int c0 = 0;
int ldir = name.lastIndexOf('/', name.length()-6);
c0 = (ldir > -1 ? ldir+1 : c0);
if (!Character.isJavaIdentifierStart(name.charAt(c0)))
{
if (LOG.isDebugEnabled()) LOG.debug("Not a java identifier: {}"+name);
return false;
}
return true;
}
/**
* Check that the given path does not contain hidden directories
*
* @param path
* @return
*/
private boolean isValidClassFilePath (String path)
{
//no path is not valid
if (path == null || path.length()==0)
return false;
//skip any classfiles that are in a hidden directory
if (path.startsWith(".") || path.contains("/."))
{
if (LOG.isDebugEnabled()) LOG.debug("Contains hidden dirs: {}"+path);
return false;
}
return true;
}
}