private static <T> void mergeStagedChainInner(List<CtClass<T>> chain) {
if (chain.size() == 1) return;
reverse(chain);
CtClass<T> toMerge = chain.get(0);
for (int i = 1; i < chain.size(); i++) {
CtClass<T> mergeInto = chain.get(i);
replaceInstantiatedTypeParams(toMerge, mergeInto);
toMerge
.getAnnotations()
.stream()
.forEach(
(CtAnnotation<? extends Annotation> a) -> {
if (mergeInto.getAnnotation(a.getActualAnnotation().getClass()) == null)
add(mergeInto, a, mergeInto::addAnnotation);
});
toMerge.getSuperInterfaces().forEach(mergeInto::addSuperInterface);
toMerge
.getAnonymousExecutables()
.forEach(b -> add(mergeInto, b, mergeInto::addAnonymousExecutable));
toMerge.getNestedTypes().forEach(nt -> add(mergeInto, nt, mergeInto::addNestedType));
toMerge.getFields().forEach(f -> add(mergeInto, f, mergeInto::addField));
for (CtMethod<?> methodToMerge : toMerge.getMethods()) {
processMethod(mergeInto, toMerge, methodToMerge);
}
final CtClass<T> finalToMerge = toMerge;
mergeInto.getConstructors().forEach(c -> processConstructor(c, finalToMerge));
mergeInto.setSuperclass(toMerge.getSuperclass());
toMerge = mergeInto;
}
}
@Override
public byte[] transform(
ClassLoader loader,
String className,
Class<?> classBeingRedefined,
ProtectionDomain protectionDomain,
byte[] classfileBuffer)
throws IllegalClassFormatException {
byte[] bytes = null;
try {
final ClassPool pool = ClassPool.getDefault();
pool.appendClassPath(new LoaderClassPath(getClass().getClassLoader()));
final CtClass ctClass = pool.getCtClass(className.replaceAll("/", "."));
if (ctClass != null) {
try {
for (CtMethod ctMethod : ctClass.getMethods()) {
if (ctMethod.hasAnnotation(Retryable.class)) {
try {
changeMethod(ctClass, ctMethod);
bytes = ctClass.toBytecode();
writeClassFile(bytes);
} catch (CannotCompileException | IOException e) {
e.printStackTrace();
}
System.out.println("found it!");
}
}
} finally {
ctClass.detach();
}
}
} catch (NotFoundException e) {
e.printStackTrace();
}
return bytes;
}
private static <T> void processMethod(
CtClass<?> mergeInto, CtClass<?> toMerge, CtMethod<T> methodToMerge) {
if (methodToMerge.hasModifier(STATIC)) {
add(mergeInto, methodToMerge, mergeInto::addMethod);
return;
}
if (methodToMerge.hasModifier(ABSTRACT)) return;
Optional<CtMethod<?>> overridingMethod =
mergeInto
.getMethods()
.stream()
.filter(m -> MethodNode.overrides(m, methodToMerge))
.findFirst();
if (overridingMethod.isPresent()) {
@SuppressWarnings("unchecked")
CtMethod<T> overriding = (CtMethod<T>) overridingMethod.get();
boolean shouldRemoveAnn = methodToMerge.getAnnotation(Override.class) == null;
if (!overriding.hasModifier(ABSTRACT)) processOverridden(mergeInto, toMerge, methodToMerge);
if (shouldRemoveAnn) removeAnnotation(overriding, Override.class);
} else {
add(mergeInto, methodToMerge, mergeInto::addMethod);
}
}
private void enhance_(ApplicationClass applicationClass, boolean buildAuthorityRegistryOnly)
throws Exception {
Plugin.trace("about to enhance applicationClass: %s", applicationClass);
CtClass ctClass = makeClass(applicationClass);
Set<CtBehavior> s = new HashSet<CtBehavior>();
s.addAll(Arrays.asList(ctClass.getDeclaredMethods()));
s.addAll(Arrays.asList(ctClass.getMethods()));
s.addAll(Arrays.asList(ctClass.getConstructors()));
s.addAll(Arrays.asList(ctClass.getDeclaredConstructors()));
for (final CtBehavior ctBehavior : s) {
if (!Modifier.isPublic(ctBehavior.getModifiers())
|| javassist.Modifier.isAbstract(ctBehavior.getModifiers())) {
continue;
}
boolean needsEnhance = false;
RequireRight rr = null;
RequirePrivilege rp = null;
RequireAccounting ra = null;
boolean allowSystem = false;
Object[] aa = ctBehavior.getAnnotations();
for (Object o : aa) {
if (o instanceof RequirePrivilege) {
needsEnhance = true;
rp = (RequirePrivilege) o;
continue;
}
if (o instanceof RequireRight) {
needsEnhance = true;
rr = (RequireRight) o;
continue;
}
if (o instanceof AllowSystemAccount) {
allowSystem = true;
continue;
}
if (o instanceof RequireAccounting) {
needsEnhance = true;
ra = (RequireAccounting) o;
}
}
if (!needsEnhance) continue;
String key = ctBehavior.getLongName();
String errMsg = String.format("Error enhancing class %s.%s: ", ctClass, ctBehavior);
// process rr & rp
if (null != rr || null != rp) {
// check before/after enhancement
Authority.registAuthoriable_(key, rr, rp);
if (!buildAuthorityRegistryOnly) {
// verify if before attribute of rr and rp is consistent
if (null != rr && null != rp && (rr.before() != rp.before())) {
String reason = "The before setting of RequireRight and RequirePrivilege doesn't match";
throw new RuntimeException(errMsg + reason);
}
boolean before = true;
if (null != rr) before = rr.before();
if (null != rp) before = rp.before();
// try best to guess the target object
String curObj = "";
if (null != rr) {
// target object only impact dynamic access checking, hence rr shall not be null
boolean isConstructor = ctBehavior instanceof CtConstructor;
boolean isStatic = false;
if (!isConstructor) isStatic = Modifier.isStatic(ctBehavior.getModifiers());
int paraCnt = ctBehavior.getParameterTypes().length;
int id = rr.target();
// calibrate target id
if (0 == id) {
if (isConstructor) {
id = -1;
} else if (isStatic) {
if (paraCnt > 0) id = 1;
else id = -1;
}
} else if (id > paraCnt) {
id = paraCnt;
}
// speculate cur target statement
String sid = null;
if (id == -1) sid = "_";
if (id > -1) sid = String.valueOf(id);
if (null != sid) {
curObj =
"play.modules.aaa.PlayDynamicRightChecker.setObjectIfNoCurrent($" + sid + ");";
}
if (-1 == id) before = false;
}
// check permission enhancement
if (before) {
ctBehavior.insertBefore(
curObj
+ " play.modules.aaa.enhancer.Enhancer.Authority.checkPermission(\""
+ key
+ "\", "
+ Boolean.toString(allowSystem)
+ ");");
} else {
ctBehavior.insertAfter(
curObj
+ " play.modules.aaa.enhancer.Enhancer.Authority.checkPermission(\""
+ key
+ "\", "
+ Boolean.toString(allowSystem)
+ ");");
}
}
}
if (buildAuthorityRegistryOnly) continue;
// process ra
if (null != ra) {
CtClass[] paraTypes = ctBehavior.getParameterTypes();
String sParam = null;
if (0 < paraTypes.length) {
sParam = "new Object[0]";
} else {
sParam = "{$$}";
}
String msg = ra.value();
if (null == msg || "".equals(msg)) msg = key;
if (ra.before()) {
ctBehavior.insertBefore(
"play.modules.aaa.utils.Accounting.info(\""
+ msg
+ "\", "
+ Boolean.toString(allowSystem)
+ ", "
+ sParam
+ ");");
} else {
ctBehavior.insertAfter(
"play.modules.aaa.utils.Accounting.info(\""
+ msg
+ "\", "
+ Boolean.toString(allowSystem)
+ ", "
+ sParam
+ ");");
}
CtClass etype = ClassPool.getDefault().get("java.lang.Exception");
ctBehavior.addCatch(
"{play.modules.aaa.utils.Accounting.error($e, \""
+ msg
+ "\", "
+ Boolean.toString(allowSystem)
+ ", "
+ sParam
+ "); throw $e;}",
etype);
}
}
if (buildAuthorityRegistryOnly) return;
applicationClass.enhancedByteCode = ctClass.toBytecode();
ctClass.detach();
}