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ClassRegistry.java
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ClassRegistry.java
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package me.nallar.tickthreading.patcher;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import com.google.common.io.ByteStreams;
import com.google.common.io.Files;
import javassist.CannotCompileException;
import javassist.ClassPath;
import javassist.ClassPool;
import javassist.CtBehavior;
import javassist.CtClass;
import javassist.NotFoundException;
import javassist.bytecode.MethodInfo;
import me.nallar.tickthreading.Log;
import me.nallar.tickthreading.util.EnumerableWrapper;
public class ClassRegistry {
private static final String hashFileName = "TickThreading.hash";
private final Map<String, File> classNameToLocation = new HashMap<String, File>();
private final Map<File, Integer> locationToPatchHash = new HashMap<File, Integer>();
private final Map<File, Integer> expectedPatchHashes = new HashMap<File, Integer>();
private final Map<File, Map<String, byte[]>> additionalClasses = new HashMap<File, Map<String, byte[]>>();
private final Set<File> updatedFiles = new HashSet<File>();
private final Set<String> unsafeClassNames = new HashSet<String>();
private final Set<ClassPath> classPathSet = new HashSet<ClassPath>();
private final Map<String, byte[]> replacementFiles = new HashMap<String, byte[]>();
private final ClassPool classes = new ClassPool(false);
public boolean disableJavassistLoading = false;
public boolean forcePatching = false;
{
MethodInfo.doPreverify = true;
classes.appendSystemPath();
}
public void clearClassInfo() {
finishModifications();
classNameToLocation.clear();
additionalClasses.clear();
updatedFiles.clear();
unsafeClassNames.clear();
replacementFiles.clear();
}
public void loadFiles(File[] filesToLoad) throws IOException {
for (File file : filesToLoad) {
if (file.isDirectory()) {
loadFiles(file.listFiles());
} else if (file.getName().toLowerCase().endsWith(".jar")) {
loadJar(new JarFile(file));
} else {
loadZip(new ZipFile(file));
}
}
}
public void loadJar(JarFile jar) throws IOException {
loadZip(jar);
// TODO: Remove code signing?
}
public ClassPath appendClassPatch(String path) throws NotFoundException {
if (disableJavassistLoading) {
return null;
}
ClassPath classPath = classes.appendClassPath(path);
classPathSet.add(classPath);
return classPath;
}
public void loadZip(ZipFile zip) throws IOException {
File file = new File(zip.getName());
try {
appendClassPatch(file.getAbsolutePath());
} catch (Exception e) {
Log.severe("Javassist could not load " + file, e);
}
for (ZipEntry zipEntry : new EnumerableWrapper<ZipEntry>((Enumeration<ZipEntry>) zip.entries())) {
String name = zipEntry.getName();
if (name.endsWith(".class")) {
String className = name.replace('/', '.').substring(0, name.lastIndexOf('.'));
if (classNameToLocation.containsKey(className)) {
unsafeClassNames.add(className);
}
classNameToLocation.put(className, file);
} else if (name.equals(hashFileName)) {
ByteArrayOutputStream output = new ByteArrayOutputStream();
ByteStreams.copy(zip.getInputStream(zipEntry), output);
int hash = Integer.valueOf(new String(output.toByteArray(), "UTF-8"));
locationToPatchHash.put(file, hash);
}
}
zip.close();
}
public void update(String className, byte[] replacement) {
if (unsafeClassNames.contains(className)) {
Log.severe(className + " is in multiple jars. Patching may not work correctly.");
}
updatedFiles.add(classNameToLocation.get(className));
className = className.replace('.', '/') + ".class";
replacementFiles.put(className, replacement);
}
public Map<String, byte[]> getAdditionalClasses(File file) {
Map<String, byte[]> additionalClasses = this.additionalClasses.get(file);
if (additionalClasses == null) {
additionalClasses = new HashMap<String, byte[]>();
this.additionalClasses.put(file, additionalClasses);
}
return additionalClasses;
}
public void add(Object requires, String additionalClassName) throws NotFoundException, IOException, CannotCompileException {
if (additionalClassName.startsWith("java.")) {
return;
}
String requiringClassName = null;
if (requires instanceof CtBehavior) {
requiringClassName = ((CtBehavior) requires).getDeclaringClass().getName();
} else if (requires instanceof CtClass) {
requiringClassName = ((CtClass) requires).getName();
}
if (requiringClassName == null) {
Log.severe("Can't add " + additionalClassName + " as a class required by unknown type: " + requires.getClass().getCanonicalName());
return;
}
File location = classNameToLocation.get(requiringClassName);
add(location, additionalClassName, getClass(additionalClassName).toBytecode());
}
public void add(File file, String className, byte[] byteCode) {
getAdditionalClasses(file).put(className.replace('.', '/') + ".class", byteCode);
}
public File getLocation(String className) {
return classNameToLocation.get(className);
}
public void finishModifications() {
for (ClassPath classPath : classPathSet) {
classes.removeClassPath(classPath);
}
classPathSet.clear();
}
public void save(File backupDirectory) throws IOException {
finishModifications();
File tempFile = null, renameFile = null;
ZipInputStream zin = null;
ZipOutputStream zout = null;
backupDirectory.mkdir();
try {
for (File zipFile : updatedFiles) {
File backupFile = new File(backupDirectory, zipFile.getName());
backupFile.delete();
Files.copy(zipFile, backupFile);
tempFile = File.createTempFile(zipFile.getName(), null);
tempFile.delete();
if (zipFile.renameTo(tempFile)) {
renameFile = zipFile;
tempFile.deleteOnExit();
} else {
throw new IOException("Couldn't rename " + zipFile + " -> " + tempFile);
}
if (isJar(zipFile)) {
zin = new JarInputStream(new FileInputStream(tempFile));
zout = new JarOutputStream(new FileOutputStream(zipFile));
} else {
zin = new ZipInputStream(new FileInputStream(tempFile));
zout = new ZipOutputStream(new FileOutputStream(zipFile));
}
Set<String> replacements = new HashSet<String>();
Map<String, byte[]> additionalClasses = getAdditionalClasses(zipFile);
ZipEntry zipEntry;
while ((zipEntry = zin.getNextEntry()) != null) {
String entryName = zipEntry.getName();
if (entryName.equals(hashFileName) || additionalClasses.containsKey(entryName) || entryName.startsWith("META-INF")) {
// Skip
} else if (replacementFiles.containsKey(entryName)) {
replacements.add(entryName);
} else {
// TODO: Ignore meta-inf?
zout.putNextEntry(isJar(zipFile) ? new JarEntry(entryName) : new ZipEntry(entryName));
ByteStreams.copy(zin, zout);
}
}
for (String name : replacements) {
zout.putNextEntry(isJar(zipFile) ? new JarEntry(name) : new ZipEntry(name));
zout.write(replacementFiles.get(name));
zout.closeEntry();
}
for (String name : additionalClasses.keySet()) {
zout.putNextEntry(isJar(zipFile) ? new JarEntry(name) : new ZipEntry(name));
zout.write(additionalClasses.get(name));
zout.closeEntry();
}
zout.putNextEntry(isJar(zipFile) ? new JarEntry(hashFileName) : new ZipEntry(hashFileName));
String patchHash = String.valueOf(expectedPatchHashes.get(zipFile));
zout.write(patchHash.getBytes("UTF-8"));
Log.info("Patched " + replacements.size() + " classes in " + zipFile.getName() + ", patchHash: " + patchHash);
Log.info("Added " + additionalClasses.size() + " classes required by patches.");
zin.close();
zout.close();
tempFile.delete();
renameFile = null;
}
} catch (ZipException e) {
if (zin != null) {
zin.close();
}
if (zout != null) {
zout.close();
}
if (renameFile != null) {
tempFile.renameTo(renameFile);
}
throw e;
}
}
public CtClass getClass(String className) throws NotFoundException {
return classes.get(className);
}
public void loadPatchHashes(PatchManager patchManager) {
Map<String, Integer> patchHashes = patchManager.getHashes();
for (String clazz : patchHashes.keySet()) {
File location = classNameToLocation.get(clazz);
if (location == null) {
continue;
}
int hash = patchHashes.get(clazz);
Integer currentHash = expectedPatchHashes.get(location);
expectedPatchHashes.put(location, (currentHash == null) ? hash : currentHash * 31 + hash);
}
}
public boolean shouldPatch(String className) {
return shouldPatch(classNameToLocation.get(className));
}
public boolean shouldPatch(File file) {
return forcePatching || !(expectedPatchHashes.get(file).equals(locationToPatchHash.get(file)));
}
public boolean shouldPatch() {
for (File file : expectedPatchHashes.keySet()) {
if (shouldPatch(file)) {
return true;
}
}
return false;
}
public void restoreBackups(File backupDirectory) {
for (File file : locationToPatchHash.keySet()) {
Integer expectedHash = expectedPatchHashes.get(file);
Integer actualHash = locationToPatchHash.get(file);
if (actualHash == null) {
continue;
}
if (forcePatching || !actualHash.equals(expectedHash)) {
file.delete();
try {
Files.copy(new File(backupDirectory, file.getName()), file);
} catch (IOException e) {
Log.severe("Failed to restore unpatched backup before patching.");
}
}
}
}
private static boolean isJar(File file) {
return file.getName().toLowerCase().endsWith(".jar");
}
}