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feat: got the patcher working*

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*only in unobfuscated environment, and I did it using hacky awfulness that will be deleted as soon as possible.
This commit is contained in:
zaaarf 2023-02-04 02:03:28 +01:00
parent 26e52da7d8
commit bc3eadea3b
No known key found for this signature in database
GPG key ID: 82240E075E31FA4C
4 changed files with 793 additions and 33 deletions
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124
src/main/java/bscv/asm/BoSCoVicinoLoader.java
View file

@ -1,27 +1,33 @@
package bscv.asm;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.*;
import java.util.stream.Collectors;
import bscv.asm.api.AnnotationChecker;
import bscv.asm.util.ClassPath22;
import bscv.asm.api.annotations.Inject;
import bscv.asm.api.annotations.Patch;
import com.google.common.collect.HashMultimap;
import cpw.mods.modlauncher.api.INameMappingService;
import cpw.mods.modlauncher.serviceapi.ILaunchPluginService;
import net.minecraftforge.fml.common.ObfuscationReflectionHelper;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Type;
import cpw.mods.modlauncher.serviceapi.ILaunchPluginService;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.MethodNode;
import javax.annotation.Nullable;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
public class BoSCoVicinoLoader implements ILaunchPluginService {
public static final String NAME = "boscovicino_asm"; //temp name
public static final String NAME = "boscovicino_asm"; //TODO: temp name
public static final Logger LOGGER = LogManager.getLogger("BoSCoVicinoASM");
private static final EnumSet<Phase> YAY = EnumSet.of(Phase.BEFORE);
@ -30,6 +36,7 @@ public class BoSCoVicinoLoader implements ILaunchPluginService {
private static final HashMultimap<String, Class<?>> patchClasses = HashMultimap.create();
public BoSCoVicinoLoader() {
loadPatchesPozzed();
LOGGER.info("BoSCoVicinoLoader instantiated successfully!");
}
@ -40,9 +47,6 @@ public class BoSCoVicinoLoader implements ILaunchPluginService {
@Override
public EnumSet<Phase> handlesClass(Type classType, final boolean isEmpty) {
//if(!isEmpty && shouldHandle(classType))
// LOGGER.info("CLAZZ >>> {}", classType.getClassName());
//return NAY;
throw new IllegalStateException("Outdated ModLauncher"); //mixin does it
}
@ -50,99 +54,155 @@ public class BoSCoVicinoLoader implements ILaunchPluginService {
public EnumSet<Phase> handlesClass(Type classType, final boolean isEmpty, final String reason) {
if(isEmpty) return NAY;
String name = classType.getClassName();
if(name.startsWith("net.minecraft.") || name.indexOf('.') == -1)
if(name.startsWith("net.minecraft.") || name.indexOf('.') == -1) {
LOGGER.debug("Marked {} as to-be-handled", classType.getClassName());
return YAY;
} else return NAY;
/* TODO: either bring back or delete this (probably the latter)
else {
try {
if(hasAnnotation(name)) {
Class<?> patch = Class.forName(name);
patchClasses.put(Type.getDescriptor(patch.getAnnotation(Patch.class).value()), patch);
return YAY;
//patchClasses.put(patch.getAnnotation(Patch.class).value(), patch);
//LOGGER.info("Found patch class {}", patch.getName());
}
} catch(IOException | ClassNotFoundException e) {
LOGGER.debug("Could not load {}", name);
}
return NAY;
}
} */
}
@Override
public int processClassWithFlags(Phase phase, ClassNode classNode, Type classType, String reason) {
if(patchClasses.containsKey(classType.getDescriptor())) {
LOGGER.debug("Processing class {} in phase {} of {}", classType.getClassName(), phase.name(), reason);
if(patchClasses.containsKey(classType.getClassName())) {
LOGGER.info("Found class with descriptor {} among the patches", classType.getClassName());
//can have multiple patches working on same class
//each of these classes may attempt to patch a method one or more times
Set<String> classMethodNames = classNode.methods
.stream()
.map(m -> m.name)
.map(m -> deobfuscator(m.name))
.collect(Collectors.toSet());
Set<String> classMethodDescriptors = classNode.methods
.stream()
.map(m -> m.desc)
.collect(Collectors.toSet());
Set<Class<?>> relevantPatches = patchClasses.get(classType.getDescriptor());
HashMultimap<Object, Method> patches = HashMultimap.create();
relevantPatches
patchClasses
.get(classType.getClassName())
.forEach(p -> {
Set<Method> injectors =
getInjectorsInPatch(p)
.stream()
.filter(m -> {
Inject a = m.getAnnotation(Inject.class);
return
classMethodNames.contains(a.methodName())
LOGGER.info("Found {} injector for method {}{}", m.getName(), a.methodName(), descriptorBuilder(a.returnType(), a.parameters()));
return classMethodNames.contains(a.methodName())
&& classMethodDescriptors.contains(descriptorBuilder(a.returnType(), a.parameters()));
})
.collect(Collectors.toSet());
if(!injectors.isEmpty()) {
try {
patches.putAll(p.newInstance(), injectors);
StringBuilder sb = new StringBuilder();
for(Method i : injectors)
sb.append(i.getName()).append(",");
LOGGER.info("Stored patch {} with injectors {}", p, sb.toString());
} catch(InstantiationException | IllegalAccessException e) {
throw new RuntimeException(e); //todo: better catch
LOGGER.error("Something went wrong while instantiating patch {}", p);
throw new RuntimeException(e); //todo: better error handling
}
}
});
if(patches.isEmpty())
if(patches.isEmpty()) {
LOGGER.info("No valid patches found for {}!", classNode.name.replace('/', '.'));
return ComputeFlags.NO_REWRITE;
else {
} else {
boolean success = false;
for(Object p : patches.keys())
for(Method m : patches.get(p))
success = success || processInjector(classNode, p, m);
success = processInjector(classNode, p, m) || success;
LOGGER.info("Altered class {}", classNode.name);
return success ? ComputeFlags.COMPUTE_FRAMES : ComputeFlags.NO_REWRITE; //todo: is this the right flag?
}
} else return ComputeFlags.NO_REWRITE;
}
private boolean hasAnnotation(String name) throws IOException {
/* TODO: Get fucking rid of this!
* This method is pure evil. It scans the JAR and forcefully loads the patches.
* Sure, it works, but it makes it impossible to split Patch Framework and client. It's
* also very slow.
* Cherry on top: ClassPath in Guava 21 is broken. My solution was to shamelessly paste
* the version from Guava 22 as ClassPath22. License-wise there shouldn't be any problem,
* but I have no intention of keeping it. It's only used here, and this method needs to
* go as soon as humanly possible. Don't worry, I'm not bloating your precious codebase.
* P.S.: Yes, that's why your shot at dynloading Modules didn't work.
**/
private static void loadPatchesPozzed() {
try {
ClassPath22.from(BoSCoVicinoLoader.class.getClassLoader())
.getAllClasses()
.stream()
.filter(ci -> {
try {
return hasAnnotation(ci.getName());
} catch(IOException e) {
throw new RuntimeException(e);
}
})
.map(ClassPath22.ClassInfo::load)
.forEach(patch -> {
patchClasses.put(patch.getAnnotation(Patch.class).value(), patch);
LOGGER.info("Found patch class {}", patch.getName());
});
} catch(IOException e) {
e.printStackTrace();
}
}
private static boolean hasAnnotation(String name) throws IOException {
ClassReader cr = new ClassReader(name);
AnnotationChecker ac = new AnnotationChecker(Patch.class);
cr.accept(ac, 0);
return ac.isAnnotationPresent();
}
private Set<Method> getInjectorsInPatch(Class<?> patch) {
private static Set<Method> getInjectorsInPatch(Class<?> patch) {
return Arrays.stream(patch.getDeclaredMethods())
.filter(m -> m.isAnnotationPresent(Inject.class))
.collect(Collectors.toSet());
}
public static String descriptorBuilder(Class<?> returnType, Class<?>[] parameters) {
public static String descriptorBuilder(@Nullable Class<?> returnType, Class<?> ... parameters) {
StringBuilder desc = new StringBuilder("(");
for(Class<?> p : parameters)
desc.append(Type.getDescriptor(p));
desc.append(")");
desc.append(Type.getDescriptor(returnType));
if(returnType != null)
desc.append(Type.getDescriptor(returnType));
return desc.toString();
}
private boolean processInjector(ClassNode target, Object patch, Method injector) {
public static String descriptorBuilder(Class<?>[] parameters) {
return descriptorBuilder(null, parameters);
}
private static String deobfuscator(String srg) {
/* FIXME: this will only work in client env (runClient task)
Find a different way to deobf searge names or try to circumvent
this step altogether (serve already deobfed names?) */
return ObfuscationReflectionHelper.remapName(INameMappingService.Domain.METHOD, srg);
}
private static boolean processInjector(ClassNode target, Object patch, Method injector) {
//get relevant method from target
Optional<MethodNode> targetMethod =
target.methods
.stream()
.filter(m -> {
Inject a = injector.getAnnotation(Inject.class);
return m.name.equals(a.methodName()) && m.desc.equals(descriptorBuilder(a.returnType(), a.parameters()));
return m.name.equals(a.methodName()) && m.desc.startsWith(descriptorBuilder(a.parameters()));
})
.findAny(); //there can literally only be one so this is safe and more efficient than findFirst

2
src/main/java/bscv/asm/api/annotations/Patch.java
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@ -8,5 +8,5 @@ import java.lang.annotation.Target;
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface Patch {
Class<?> value();
String value();
}

30
src/main/java/bscv/asm/patches/TestPatch.java Normal file
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@ -0,0 +1,30 @@
package bscv.asm.patches;
import bscv.asm.api.annotations.Inject;
import bscv.asm.api.annotations.Patch;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.MethodNode;
/**
* When working as intended, this patch will crash the game
* as soon it finished loading with a NegativeArraySizeException.
*/
@Patch("net.minecraft.client.Minecraft")
public class TestPatch implements Opcodes {
@Inject(methodName = "tick", returnType = void.class, parameters = {}, description = "Test injection!")
public void inject(MethodNode main) {
InsnList insnList = new InsnList();
insnList.add(new InsnNode(POP));
insnList.add(new InsnNode(POP));
insnList.add(new InsnNode(POP));
insnList.add(new InsnNode(POP));
insnList.add(new InsnNode(POP));
insnList.add(new InsnNode(POP));
insnList.add(new InsnNode(POP));
insnList.add(new InsnNode(POP));
main.instructions.insert(insnList);
}
}

670
src/main/java/bscv/asm/util/ClassPath22.java Normal file
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@ -0,0 +1,670 @@
package bscv.asm.util;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.StandardSystemProperty.JAVA_CLASS_PATH;
import static com.google.common.base.StandardSystemProperty.PATH_SEPARATOR;
import static java.util.logging.Level.WARNING;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.CharMatcher;
import com.google.common.base.Splitter;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.common.io.ByteSource;
import com.google.common.io.CharSource;
import com.google.common.io.Resources;
import com.google.common.reflect.Reflection;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.charset.Charset;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import java.util.logging.Logger;
import javax.annotation.CheckForNull;
/**
* Scans the source of a {@link ClassLoader} and finds all loadable classes and resources.
*
* <h2>Prefer <a href="https://github.com/classgraph/classgraph/wiki">ClassGraph</a> over {@code
* ClassPath22}</h2>
*
* <p>We recommend using <a href="https://github.com/classgraph/classgraph/wiki">ClassGraph</a>
* instead of {@code ClassPath22}. ClassGraph improves upon {@code ClassPath22} in several ways,
* including addressing many of its limitations. Limitations of {@code ClassPath22} include:
*
* <ul>
* <li>It looks only for files and JARs in URLs available from {@link URLClassLoader} instances or
* the {@linkplain ClassLoader#getSystemClassLoader() system class loader}. This means it does
* not look for classes in the <i>module path</i>.
* <li>It understands only {@code file:} URLs. This means that it does not understand <a
* href="https://openjdk.java.net/jeps/220">{@code jrt:/} URLs</a>, among <a
* href="https://github.com/classgraph/classgraph/wiki/Classpath-specification-mechanisms">others</a>.
* <li>It does not know how to look for classes when running under an Android VM. (ClassGraph does
* not support this directly, either, but ClassGraph documents how to <a
* href="https://github.com/classgraph/classgraph/wiki/Build-Time-Scanning">perform build-time
* classpath scanning and make the results available to an Android app</a>.)
* <li>Like all of Guava, it is not tested under Windows. We have gotten <a
* href="https://github.com/google/guava/issues/2130">a report of a specific bug under
* Windows</a>.
* <li>It <a href="https://github.com/google/guava/issues/2712">returns only one resource for a
* given path</a>, even if resources with that path appear in multiple jars or directories.
* <li>It assumes that <a href="https://github.com/google/guava/issues/3349">any class with a
* {@code $} in its name is a nested class</a>.
* </ul>
*
* <h2>{@code ClassPath22} and symlinks</h2>
*
* <p>In the case of directory classloaders, symlinks are supported but cycles are not traversed.
* This guarantees discovery of each <em>unique</em> loadable resource. However, not all possible
* aliases for resources on cyclic paths will be listed.
*
* @author Ben Yu
* @since 14.0
*/
public final class ClassPath22 {
private static final Logger logger = Logger.getLogger(ClassPath22.class.getName());
/** Separator for the Class-Path manifest attribute value in jar files. */
private static final Splitter CLASS_PATH_ATTRIBUTE_SEPARATOR =
Splitter.on(" ").omitEmptyStrings();
private static final String CLASS_FILE_NAME_EXTENSION = ".class";
private final ImmutableSet<ResourceInfo> resources;
private ClassPath22(ImmutableSet<ResourceInfo> resources) {
this.resources = resources;
}
/**
* Returns a {@code ClassPath22} representing all classes and resources loadable from {@code
* classloader} and its ancestor class loaders.
*
* <p><b>Warning:</b> {@code ClassPath22} can find classes and resources only from:
*
* <ul>
* <li>{@link URLClassLoader} instances' {@code file:} URLs
* <li>the {@linkplain ClassLoader#getSystemClassLoader() system class loader}. To search the
* system class loader even when it is not a {@link URLClassLoader} (as in Java 9), {@code
* ClassPath22} searches the files from the {@code java.class.path} system property.
* </ul>
*
* @throws IOException if the attempt to read class path resources (jar files or directories)
* failed.
*/
public static ClassPath22 from(ClassLoader classloader) throws IOException {
ImmutableSet<LocationInfo> locations = locationsFrom(classloader);
// Add all locations to the scanned set so that in a classpath [jar1, jar2], where jar1 has a
// manifest with Class-Path pointing to jar2, we won't scan jar2 twice.
Set<File> scanned = new HashSet<>();
for (LocationInfo location : locations) {
scanned.add(location.file());
}
// Scan all locations
ImmutableSet.Builder<ResourceInfo> builder = ImmutableSet.builder();
for (LocationInfo location : locations) {
builder.addAll(location.scanResources(scanned));
}
return new ClassPath22(builder.build());
}
/**
* Returns all resources loadable from the current class path, including the class files of all
* loadable classes but excluding the "META-INF/MANIFEST.MF" file.
*/
public ImmutableSet<ResourceInfo> getResources() {
return resources;
}
/**
* Returns all classes loadable from the current class path.
*
* @since 16.0
*/
public ImmutableSet<ClassInfo> getAllClasses() {
return FluentIterable.from(resources).filter(ClassInfo.class).toSet();
}
/**
* Returns all top level classes loadable from the current class path. Note that "top-level-ness"
* is determined heuristically by class name (see {@link ClassInfo#isTopLevel}).
*/
public ImmutableSet<ClassInfo> getTopLevelClasses() {
return FluentIterable.from(resources)
.filter(ClassInfo.class)
.filter(ClassInfo::isTopLevel)
.toSet();
}
/** Returns all top level classes whose package name is {@code packageName}. */
public ImmutableSet<ClassInfo> getTopLevelClasses(String packageName) {
checkNotNull(packageName);
ImmutableSet.Builder<ClassInfo> builder = ImmutableSet.builder();
for (ClassInfo classInfo : getTopLevelClasses()) {
if (classInfo.getPackageName().equals(packageName)) {
builder.add(classInfo);
}
}
return builder.build();
}
/**
* Returns all top level classes whose package name is {@code packageName} or starts with {@code
* packageName} followed by a '.'.
*/
public ImmutableSet<ClassInfo> getTopLevelClassesRecursive(String packageName) {
checkNotNull(packageName);
String packagePrefix = packageName + '.';
ImmutableSet.Builder<ClassInfo> builder = ImmutableSet.builder();
for (ClassInfo classInfo : getTopLevelClasses()) {
if (classInfo.getName().startsWith(packagePrefix)) {
builder.add(classInfo);
}
}
return builder.build();
}
/**
* Represents a class path resource that can be either a class file or any other resource file
* loadable from the class path.
*
* @since 14.0
*/
public static class ResourceInfo {
private final File file;
private final String resourceName;
final ClassLoader loader;
static ResourceInfo of(File file, String resourceName, ClassLoader loader) {
if (resourceName.endsWith(CLASS_FILE_NAME_EXTENSION)) {
return new ClassInfo(file, resourceName, loader);
} else {
return new ResourceInfo(file, resourceName, loader);
}
}
ResourceInfo(File file, String resourceName, ClassLoader loader) {
this.file = checkNotNull(file);
this.resourceName = checkNotNull(resourceName);
this.loader = checkNotNull(loader);
}
/**
* Returns the url identifying the resource.
*
* <p>See {@link ClassLoader#getResource}
*
* @throws NoSuchElementException if the resource cannot be loaded through the class loader,
* despite physically existing in the class path.
*/
public final URL url() {
URL url = loader.getResource(resourceName);
if (url == null) {
throw new NoSuchElementException(resourceName);
}
return url;
}
/**
* Returns a {@link ByteSource} view of the resource from which its bytes can be read.
*
* @throws NoSuchElementException if the resource cannot be loaded through the class loader,
* despite physically existing in the class path.
* @since 20.0
*/
public final ByteSource asByteSource() {
return Resources.asByteSource(url());
}
/**
* Returns a {@link CharSource} view of the resource from which its bytes can be read as
* characters decoded with the given {@code charset}.
*
* @throws NoSuchElementException if the resource cannot be loaded through the class loader,
* despite physically existing in the class path.
* @since 20.0
*/
public final CharSource asCharSource(Charset charset) {
return Resources.asCharSource(url(), charset);
}
/** Returns the fully qualified name of the resource. Such as "com/mycomp/foo/bar.txt". */
public final String getResourceName() {
return resourceName;
}
/** Returns the file that includes this resource. */
final File getFile() {
return file;
}
@Override
public int hashCode() {
return resourceName.hashCode();
}
@Override
public boolean equals(@CheckForNull Object obj) {
if (obj instanceof ResourceInfo) {
ResourceInfo that = (ResourceInfo) obj;
return resourceName.equals(that.resourceName) && loader == that.loader;
}
return false;
}
// Do not change this arbitrarily. We rely on it for sorting ResourceInfo.
@Override
public String toString() {
return resourceName;
}
}
/**
* Represents a class that can be loaded through {@link #load}.
*
* @since 14.0
*/
public static final class ClassInfo extends ResourceInfo {
private final String className;
ClassInfo(File file, String resourceName, ClassLoader loader) {
super(file, resourceName, loader);
this.className = getClassName(resourceName);
}
/**
* Returns the package name of the class, without attempting to load the class.
*
* <p>Behaves similarly to {@code class.getPackage().}{@link Package#getName() getName()} but
* does not require the class (or package) to be loaded.
*
* <p>But note that this method may behave differently for a class in the default package: For
* such classes, this method always returns an empty string. But under some version of Java,
* {@code class.getPackage().getName()} produces a {@code NullPointerException} because {@code
* class.getPackage()} returns {@code null}.
*/
public String getPackageName() {
return Reflection.getPackageName(className);
}
/**
* Returns the simple name of the underlying class as given in the source code.
*
* <p>Behaves similarly to {@link Class#getSimpleName()} but does not require the class to be
* loaded.
*
* <p>But note that this class uses heuristics to identify the simple name. See a related
* discussion in <a href="https://github.com/google/guava/issues/3349">issue 3349</a>.
*/
public String getSimpleName() {
int lastDollarSign = className.lastIndexOf('$');
if (lastDollarSign != -1) {
String innerClassName = className.substring(lastDollarSign + 1);
// local and anonymous classes are prefixed with number (1,2,3...), anonymous classes are
// entirely numeric whereas local classes have the user supplied name as a suffix
return CharMatcher.inRange('0', '9').trimLeadingFrom(innerClassName);
}
String packageName = getPackageName();
if (packageName.isEmpty()) {
return className;
}
// Since this is a top level class, its simple name is always the part after package name.
return className.substring(packageName.length() + 1);
}
/**
* Returns the fully qualified name of the class.
*
* <p>Behaves identically to {@link Class#getName()} but does not require the class to be
* loaded.
*/
public String getName() {
return className;
}
/**
* Returns true if the class name "looks to be" top level (not nested), that is, it includes no
* '$' in the name. This method may return false for a top-level class that's intentionally
* named with the '$' character. If this is a concern, you could use {@link #load} and then
* check on the loaded {@link Class} object instead.
*
* @since 30.1
*/
public boolean isTopLevel() {
return className.indexOf('$') == -1;
}
/**
* Loads (but doesn't link or initialize) the class.
*
* @throws LinkageError when there were errors in loading classes that this class depends on.
* For example, {@link NoClassDefFoundError}.
*/
public Class<?> load() {
try {
return loader.loadClass(className);
} catch (ClassNotFoundException e) {
// Shouldn't happen, since the class name is read from the class path.
throw new IllegalStateException(e);
}
}
@Override
public String toString() {
return className;
}
}
/**
* Returns all locations that {@code classloader} and parent loaders load classes and resources
* from. Callers can {@linkplain LocationInfo#scanResources scan} individual locations selectively
* or even in parallel.
*/
static ImmutableSet<LocationInfo> locationsFrom(ClassLoader classloader) {
ImmutableSet.Builder<LocationInfo> builder = ImmutableSet.builder();
for (Map.Entry<File, ClassLoader> entry : getClassPathEntries(classloader).entrySet()) {
builder.add(new LocationInfo(entry.getKey(), entry.getValue()));
}
return builder.build();
}
/**
* Represents a single location (a directory or a jar file) in the class path and is responsible
* for scanning resources from this location.
*/
static final class LocationInfo {
final File home;
private final ClassLoader classloader;
LocationInfo(File home, ClassLoader classloader) {
this.home = checkNotNull(home);
this.classloader = checkNotNull(classloader);
}
/** Returns the file this location is from. */
public final File file() {
return home;
}
/** Scans this location and returns all scanned resources. */
public ImmutableSet<ResourceInfo> scanResources() throws IOException {
return scanResources(new HashSet<File>());
}
/**
* Scans this location and returns all scanned resources.
*
* <p>This file and jar files from "Class-Path" entry in the scanned manifest files will be
* added to {@code scannedFiles}.
*
* <p>A file will be scanned at most once even if specified multiple times by one or multiple
* jar files' "Class-Path" manifest entries. Particularly, if a jar file from the "Class-Path"
* manifest entry is already in {@code scannedFiles}, either because it was scanned earlier, or
* it was intentionally added to the set by the caller, it will not be scanned again.
*
* <p>Note that when you call {@code location.scanResources(scannedFiles)}, the location will
* always be scanned even if {@code scannedFiles} already contains it.
*/
public ImmutableSet<ResourceInfo> scanResources(Set<File> scannedFiles) throws IOException {
ImmutableSet.Builder<ResourceInfo> builder = ImmutableSet.builder();
scannedFiles.add(home);
scan(home, scannedFiles, builder);
return builder.build();
}
private void scan(File file, Set<File> scannedUris, ImmutableSet.Builder<ResourceInfo> builder)
throws IOException {
try {
if (!file.exists()) {
return;
}
} catch (SecurityException e) {
logger.warning("Cannot access " + file + ": " + e);
// TODO(emcmanus): consider whether to log other failure cases too.
return;
}
if (file.isDirectory()) {
scanDirectory(file, builder);
} else {
scanJar(file, scannedUris, builder);
}
}
private void scanJar(
File file, Set<File> scannedUris, ImmutableSet.Builder<ResourceInfo> builder)
throws IOException {
JarFile jarFile;
try {
jarFile = new JarFile(file);
} catch (IOException e) {
// Not a jar file
return;
}
try {
for (File path : getClassPathFromManifest(file, jarFile.getManifest())) {
// We only scan each file once independent of the classloader that file might be
// associated with.
if (scannedUris.add(path.getCanonicalFile())) {
scan(path, scannedUris, builder);
}
}
scanJarFile(jarFile, builder);
} finally {
try {
jarFile.close();
} catch (IOException ignored) { // similar to try-with-resources, but don't fail scanning
}
}
}
private void scanJarFile(JarFile file, ImmutableSet.Builder<ResourceInfo> builder) {
Enumeration<JarEntry> entries = file.entries();
while (entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
if (entry.isDirectory() || entry.getName().equals(JarFile.MANIFEST_NAME)) {
continue;
}
builder.add(ResourceInfo.of(new File(file.getName()), entry.getName(), classloader));
}
}
private void scanDirectory(File directory, ImmutableSet.Builder<ResourceInfo> builder)
throws IOException {
Set<File> currentPath = new HashSet<>();
currentPath.add(directory.getCanonicalFile());
scanDirectory(directory, "", currentPath, builder);
}
/**
* Recursively scan the given directory, adding resources for each file encountered. Symlinks
* which have already been traversed in the current tree path will be skipped to eliminate
* cycles; otherwise symlinks are traversed.
*
* @param directory the root of the directory to scan
* @param packagePrefix resource path prefix inside {@code classloader} for any files found
* under {@code directory}
* @param currentPath canonical files already visited in the current directory tree path, for
* cycle elimination
*/
private void scanDirectory(
File directory,
String packagePrefix,
Set<File> currentPath,
ImmutableSet.Builder<ResourceInfo> builder)
throws IOException {
File[] files = directory.listFiles();
if (files == null) {
logger.warning("Cannot read directory " + directory);
// IO error, just skip the directory
return;
}
for (File f : files) {
String name = f.getName();
if (f.isDirectory()) {
File deref = f.getCanonicalFile();
if (currentPath.add(deref)) {
scanDirectory(deref, packagePrefix + name + "/", currentPath, builder);
currentPath.remove(deref);
}
} else {
String resourceName = packagePrefix + name;
if (!resourceName.equals(JarFile.MANIFEST_NAME)) {
builder.add(ResourceInfo.of(f, resourceName, classloader));
}
}
}
}
@Override
public boolean equals(@CheckForNull Object obj) {
if (obj instanceof LocationInfo) {
LocationInfo that = (LocationInfo) obj;
return home.equals(that.home) && classloader.equals(that.classloader);
}
return false;
}
@Override
public int hashCode() {
return home.hashCode();
}
@Override
public String toString() {
return home.toString();
}
}
/**
* Returns the class path URIs specified by the {@code Class-Path} manifest attribute, according
* to <a
* href="http://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Main_Attributes">JAR
* File Specification</a>. If {@code manifest} is null, it means the jar file has no manifest, and
* an empty set will be returned.
*/
@VisibleForTesting
static ImmutableSet<File> getClassPathFromManifest(
File jarFile, @CheckForNull Manifest manifest) {
if (manifest == null) {
return ImmutableSet.of();
}
ImmutableSet.Builder<File> builder = ImmutableSet.builder();
String classpathAttribute =
manifest.getMainAttributes().getValue(Attributes.Name.CLASS_PATH.toString());
if (classpathAttribute != null) {
for (String path : CLASS_PATH_ATTRIBUTE_SEPARATOR.split(classpathAttribute)) {
URL url;
try {
url = getClassPathEntry(jarFile, path);
} catch (MalformedURLException e) {
// Ignore bad entry
logger.warning("Invalid Class-Path entry: " + path);
continue;
}
if (url.getProtocol().equals("file")) {
builder.add(toFile(url));
}
}
}
return builder.build();
}
@VisibleForTesting
static ImmutableMap<File, ClassLoader> getClassPathEntries(ClassLoader classloader) {
LinkedHashMap<File, ClassLoader> entries = Maps.newLinkedHashMap();
// Search parent first, since it's the order ClassLoader#loadClass() uses.
ClassLoader parent = classloader.getParent();
if (parent != null) {
entries.putAll(getClassPathEntries(parent));
}
for (URL url : getClassLoaderUrls(classloader)) {
if (url.getProtocol().equals("file")) {
File file = toFile(url);
if (!entries.containsKey(file)) {
entries.put(file, classloader);
}
}
}
return ImmutableMap.copyOf(entries);
}
private static ImmutableList<URL> getClassLoaderUrls(ClassLoader classloader) {
if (classloader instanceof URLClassLoader) {
return ImmutableList.copyOf(((URLClassLoader) classloader).getURLs());
}
if (classloader.equals(ClassLoader.getSystemClassLoader())) {
return parseJavaClassPath();
}
return ImmutableList.of();
}
/**
* Returns the URLs in the class path specified by the {@code java.class.path} {@linkplain
* System#getProperty system property}.
*/
@VisibleForTesting // TODO(b/65488446): Make this a public API.
static ImmutableList<URL> parseJavaClassPath() {
ImmutableList.Builder<URL> urls = ImmutableList.builder();
for (String entry : Splitter.on(PATH_SEPARATOR.value()).split(JAVA_CLASS_PATH.value())) {
try {
try {
urls.add(new File(entry).toURI().toURL());
} catch (SecurityException e) { // File.toURI checks to see if the file is a directory
urls.add(new URL("file", null, new File(entry).getAbsolutePath()));
}
} catch (MalformedURLException e) {
logger.log(WARNING, "malformed classpath entry: " + entry, e);
}
}
return urls.build();
}
/**
* Returns the absolute uri of the Class-Path entry value as specified in <a
* href="http://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Main_Attributes">JAR
* File Specification</a>. Even though the specification only talks about relative urls, absolute
* urls are actually supported too (for example, in Maven surefire plugin).
*/
@VisibleForTesting
static URL getClassPathEntry(File jarFile, String path) throws MalformedURLException {
return new URL(jarFile.toURI().toURL(), path);
}
@VisibleForTesting
static String getClassName(String filename) {
int classNameEnd = filename.length() - CLASS_FILE_NAME_EXTENSION.length();
return filename.substring(0, classNameEnd).replace('/', '.');
}
// TODO(benyu): Try java.nio.file.Paths#get() when Guava drops JDK 6 support.
@VisibleForTesting
static File toFile(URL url) {
checkArgument(url.getProtocol().equals("file"));
try {
return new File(url.toURI()); // Accepts escaped characters like %20.
} catch (URISyntaxException e) { // URL.toURI() doesn't escape chars.
return new File(url.getPath()); // Accepts non-escaped chars like space.
}
}
}