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//Portions Copyright [2016-2020] [Payara Foundation and/or affiliates]
package com.sun.ejb.codegen;
import com.sun.enterprise.container.common.spi.util.IndirectlySerializable;
import com.sun.enterprise.container.common.spi.util.SerializableObjectFactory;
import com.sun.ejb.spi.container.OptionalLocalInterfaceProvider;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.lang.reflect.ReflectPermission;
import java.util.Map;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import java.io.Serializable;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
import java.security.Permission;
import com.sun.enterprise.deployment.util.TypeUtil;
import org.glassfish.api.deployment.ResourceClassLoader;
import org.objectweb.asm.*;
import org.objectweb.asm.commons.GeneratorAdapter;
import org.objectweb.asm.commons.Method;
import com.sun.ejb.containers.ClassSupplier;
public class EjbOptionalIntfGenerator
implements Opcodes {
private static final int INTF_FLAGS = ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES;
private static final String DELEGATE_FIELD_NAME = "__ejb31_delegate";
private static final Class[] emptyClassArray = new Class[] {};
private Map classMap = new HashMap<>();
private final ClassLoader loader;
private ProtectionDomain protectionDomain;
public EjbOptionalIntfGenerator(ClassLoader loader) {
this.loader = loader;
}
public Class loadClass(final String name) throws Exception {
Class clz = null;
try {
clz = loader.loadClass(name);
} catch (ClassNotFoundException cnfe) {
final byte[] classData = (byte[]) classMap.get(name);
if (classData != null) {
clz = (Class) java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction() {
public java.lang.Object run() {
return makeClass(name, classData, protectionDomain, loader);
}
}
);
}
}
if (clz == null) {
throw new ClassNotFoundException(name);
}
return clz;
}
public Class loadClass(final String ejbClass, final String name, ClassSupplier generator)
throws Exception
{
Class clz = null;
try {
clz = loader.loadClass(name);
} catch (ClassNotFoundException cnfe) {
final byte[] classData = generator.get();
if (classData != null) {
clz = (Class) java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction() {
public java.lang.Object run() {
return makeClass(ejbClass, name, classData, protectionDomain, loader);
}
}
);
}
}
if (clz == null) {
throw new ClassNotFoundException(name);
}
return clz;
}
public byte[] generateOptionalLocalInterface(Class ejbClass, String intfClassName)
throws Exception {
return generateInterface(ejbClass, intfClassName, Serializable.class);
}
public byte[] generateInterface(Class ejbClass, String intfClassName, final Class... interfaces) throws Exception {
String[] interfaceNames = new String[interfaces.length];
for (int i = 0; i < interfaces.length; i++) {
interfaceNames[i] = Type.getType(interfaces[i]).getInternalName();
}
if( protectionDomain == null ) {
protectionDomain = ejbClass.getProtectionDomain();
}
ClassWriter cw = new ClassWriter(INTF_FLAGS);
// ClassVisitor tv = (_debug)
// ? new TraceClassVisitor(cw, new PrintWriter(System.out)) : cw;
ClassVisitor tv = cw;
String intfInternalName = intfClassName.replace('.', '/');
tv.visit(V1_1, ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE,
intfInternalName, null,
Type.getType(Object.class).getInternalName(),
interfaceNames );
for (java.lang.reflect.Method m : ejbClass.getMethods()) {
if (qualifiedAsBeanMethod(m)) {
generateInterfaceMethod(tv, m);
}
}
tv.visitEnd();
byte[] classData = cw.toByteArray();
classMap.put(intfClassName, classData);
return classData;
}
/**
* Determines if a method from a bean class can be considered as a business
* method for EJB of no-interface view.
* @param m a public method
* @return true if m can be included as a bean business method.
*/
private boolean qualifiedAsBeanMethod(java.lang.reflect.Method m) {
if (m.getDeclaringClass() == Object.class) {
return false;
}
int mod = m.getModifiers();
return !Modifier.isStatic(mod) && !Modifier.isFinal(mod);
}
private boolean hasSameSignatureAsExisting(java.lang.reflect.Method toMatch,
Set methods) {
boolean sameSignature = false;
for(java.lang.reflect.Method m : methods) {
if( TypeUtil.sameMethodSignature(m, toMatch) ) {
sameSignature = true;
break;
}
}
return sameSignature;
}
public byte[] generateOptionalLocalInterfaceSubClass(
Class superClass,
String subClassName,
Class delegateClass) throws Exception {
return generateSubclass(
superClass,
subClassName,
delegateClass,
IndirectlySerializable.class
);
}
public byte[] generateSubclass(
Class superClass,
String subClassName,
Class delegateClass,
Class... interfaces) throws Exception {
if( protectionDomain == null ) {
protectionDomain = superClass.getProtectionDomain();
}
ClassWriter cw = new ClassWriter(INTF_FLAGS);
ClassVisitor tv = cw;
// ClassVisitor tv = (_debug)
// ? new TraceClassVisitor(cw, new PrintWriter(System.out)) : cw;
String[] interfaceNames = new String[interfaces.length + 1];
interfaceNames[0] = OptionalLocalInterfaceProvider.class.getName().replace('.', '/');
for (int i = 0; i < interfaces.length; i++) {
interfaceNames[i+1] = interfaces[i].getName().replace('.', '/');
}
tv.visit(V1_1, ACC_PUBLIC, subClassName.replace('.', '/'), null,
Type.getType(superClass).getInternalName(), interfaceNames);
String fldDesc = Type.getDescriptor(delegateClass);
FieldVisitor fv = tv.visitField(ACC_PRIVATE, DELEGATE_FIELD_NAME,
fldDesc, null, null);
fv.visitEnd();
// Generate constructor. The EJB spec only allows no-arg constructors, but
// JSR 299 added requirements that allow a single constructor to define
// parameters injected by CDI.
{
Constructor[] ctors = superClass.getConstructors();
Constructor ctorWithParams = null;
for(Constructor ctor : ctors) {
if(ctor.getParameterTypes().length == 0) {
ctorWithParams = null; //exists the no-arg ctor, use it
break;
} else if(ctorWithParams == null) {
ctorWithParams = ctor;
}
}
MethodVisitor cv = tv.visitMethod(ACC_PUBLIC, "", "()V", null, null);
cv.visitVarInsn(ALOAD, 0);
String paramTypeString = "()V";
// if void, only one param (implicit 'this' param)
int maxValue = 1;
if( ctorWithParams != null ) {
Class[] paramTypes = ctorWithParams.getParameterTypes();
for(int i = 0; i < paramTypes.length; i++) {
cv.visitInsn(ACONST_NULL);
}
paramTypeString = Type.getConstructorDescriptor(ctorWithParams);
// num params + one for 'this' pointer
maxValue = paramTypes.length + 1;
}
cv.visitMethodInsn(INVOKESPECIAL, Type.getType(superClass).getInternalName(), "",
paramTypeString);
cv.visitInsn(RETURN);
cv.visitMaxs(maxValue, 1);
}
generateSetDelegateMethod(tv, delegateClass, subClassName);
for (Class anInterface : interfaces) {
// dblevins: Don't think we need this special case.
// Should be covered by letting generateBeanMethod
// handle the methods on IndirectlySerializable.
//
// Not sure where the related tests are to verify.
if (anInterface.equals(IndirectlySerializable.class)) {
generateGetSerializableObjectFactoryMethod(tv, fldDesc, subClassName.replace('.', '/'));
continue;
}
for (java.lang.reflect.Method method : anInterface.getMethods()) {
generateBeanMethod(tv, subClassName, method, delegateClass);
}
}
Set allMethods = new HashSet();
for (java.lang.reflect.Method m : superClass.getMethods()) {
if (qualifiedAsBeanMethod(m)) {
generateBeanMethod(tv, subClassName, m, delegateClass);
}
}
for (Class clz = superClass; clz != Object.class; clz = clz.getSuperclass()) {
java.lang.reflect.Method[] beanMethods = clz.getDeclaredMethods();
for (java.lang.reflect.Method mth : beanMethods) {
if( !hasSameSignatureAsExisting(mth, allMethods)) {
int modifiers = mth.getModifiers();
boolean isPublic = Modifier.isPublic(modifiers);
boolean isPrivate = Modifier.isPrivate(modifiers);
boolean isProtected = Modifier.isProtected(modifiers);
boolean isPackage = !isPublic && !isPrivate && !isProtected;
boolean isStatic = Modifier.isStatic(modifiers);
if( (isPackage || isProtected) && !isStatic ) {
generateNonAccessibleMethod(tv, mth);
}
allMethods.add(mth);
}
}
}
// add toString() method if it was not overridden
java.lang.reflect.Method mth = Object.class.getDeclaredMethod("toString");
if( !hasSameSignatureAsExisting(mth, allMethods)) {
//generateBeanMethod(tv, subClassName, mth, delegateClass);
generateToStringBeanMethod(tv, superClass);
}
tv.visitEnd();
byte[] classData = cw.toByteArray();
classMap.put(subClassName, classData);
return classData;
}
private static void generateInterfaceMethod(ClassVisitor cv, java.lang.reflect.Method m)
throws Exception {
String methodName = m.getName();
Type returnType = Type.getReturnType(m);
Type[] argTypes = Type.getArgumentTypes(m);
Method asmMethod = new Method(methodName, returnType, argTypes);
GeneratorAdapter cg = new GeneratorAdapter(ACC_PUBLIC + ACC_ABSTRACT,
asmMethod, null, getExceptionTypes(m), cv);
cg.endMethod();
}
private static void generateBeanMethod(
ClassVisitor cv,
String subClassName,
java.lang.reflect.Method m,
Class delegateClass) {
String methodName = m.getName();
Type returnType = Type.getReturnType(m);
Type[] argTypes = Type.getArgumentTypes(m);
Method asmMethod = new Method(methodName, returnType, argTypes);
GeneratorAdapter mg = new GeneratorAdapter(ACC_PUBLIC, asmMethod, null,
getExceptionTypes(m), cv);
mg.loadThis();
mg.visitFieldInsn(GETFIELD, subClassName.replace('.', '/'),
DELEGATE_FIELD_NAME, Type.getType(delegateClass).getDescriptor());
mg.loadArgs();
mg.invokeInterface(Type.getType(delegateClass), asmMethod);
mg.returnValue();
mg.endMethod();
}
private static void generateToStringBeanMethod(
ClassVisitor cv,
Class superClass) {
String toStringMethodName = "toString";
String toStringMethodDescriptor = "()Ljava/lang/String;";
String stringBuilder = "java/lang/StringBuilder";
MethodVisitor mv = cv.visitMethod(ACC_PUBLIC, toStringMethodName, toStringMethodDescriptor, null, null);
mv.visitVarInsn(ALOAD, 0);
mv.visitTypeInsn(NEW, stringBuilder);
mv.visitInsn(DUP);
mv.visitMethodInsn(INVOKESPECIAL, stringBuilder, "", "()V");
mv.visitLdcInsn(superClass.getName() + "@");
mv.visitMethodInsn(INVOKEVIRTUAL, stringBuilder, "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "hashCode", "()I");
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Integer", "toHexString", "(I)Ljava/lang/String;");
mv.visitMethodInsn(INVOKEVIRTUAL, stringBuilder, "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
mv.visitMethodInsn(INVOKEVIRTUAL, stringBuilder, toStringMethodName, toStringMethodDescriptor);
mv.visitInsn(ARETURN);
mv.visitMaxs(2, 1);
}
private static void generateNonAccessibleMethod(
ClassVisitor cv,
java.lang.reflect.Method m
) {
String methodName = m.getName();
Type returnType = Type.getReturnType(m);
Type[] argTypes = Type.getArgumentTypes(m);
Method asmMethod = new Method(methodName, returnType, argTypes);
// Only called for non-static Protected or Package access
int access = ACC_PUBLIC;
GeneratorAdapter mg = new GeneratorAdapter(access, asmMethod, null,
getExceptionTypes(m), cv);
mg.throwException(Type.getType(jakarta.ejb.EJBException.class),
"Illegal non-business method access on no-interface view");
mg.returnValue();
mg.endMethod();
}
private static void generateGetSerializableObjectFactoryMethod(ClassVisitor classVisitor,
String fieldDesc,
String classDesc) {
MethodVisitor cv = classVisitor.visitMethod(ACC_PUBLIC, "getSerializableObjectFactory",
"()L" + SerializableObjectFactory.class.getName().replace('.', '/') + ";", null, new String[] { "java/io/IOException" });
cv.visitVarInsn(ALOAD, 0);
cv.visitFieldInsn(GETFIELD, classDesc, DELEGATE_FIELD_NAME, fieldDesc);
cv.visitTypeInsn(CHECKCAST, IndirectlySerializable.class.getName().replace('.', '/'));
cv.visitMethodInsn(INVOKEINTERFACE,
IndirectlySerializable.class.getName().replace('.', '/'), "getSerializableObjectFactory",
"()L" + SerializableObjectFactory.class.getName().replace('.', '/') + ";");
cv.visitInsn(ARETURN);
cv.visitMaxs(1, 1);
}
private static Type[] getExceptionTypes(java.lang.reflect.Method m) {
Class[] exceptions = m.getExceptionTypes();
Type[] eTypes = new Type[exceptions.length];
for (int i=0; i() {
public java.lang.reflect.Method run() {
try {
java.lang.reflect.Method meth = ClassLoader.class.getDeclaredMethod(
"defineClass", String.class,
byte[].class, int.class, int.class,
ProtectionDomain.class ) ;
meth.setAccessible( true ) ;
return meth ;
} catch (Exception exc) {
throw new RuntimeException(
"Could not find defineClass method!", exc ) ;
}
}
}
) ;
private static final Permission accessControlPermission =
new ReflectPermission( "suppressAccessChecks" ) ;
// This requires a permission check
private Class makeClass(
String ejbClass,
String name,
byte[] def,
ProtectionDomain pd,
ClassLoader loader) {
SecurityManager sman = System.getSecurityManager();
if (sman != null) {
sman.checkPermission(accessControlPermission);
}
if (loader instanceof ResourceClassLoader) {
ResourceClassLoader classLoader = (ResourceClassLoader) loader;
return classLoader.addGeneratedResourceEntry(ejbClass, name, def, pd);
} else {
try {
return (Class) defineClassMethod.invoke(loader,
name, def, 0, def.length, pd);
} catch (Exception exc) {
throw new RuntimeException("Could not invoke defineClass!",
exc);
}
}
}
// This requires a permission check
private Class makeClass(
String name,
byte[] def,
ProtectionDomain pd,
ClassLoader loader) {
SecurityManager sman = System.getSecurityManager();
if (sman != null) {
sman.checkPermission(accessControlPermission);
}
try {
return (Class) defineClassMethod.invoke(loader,
name, def, 0, def.length, pd);
} catch (Exception exc) {
throw new RuntimeException("Could not invoke defineClass!",
exc);
}
}
}
