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brut.androlib.ApkDecoder Maven / Gradle / Ivy
/*
* Copyright (C) 2010 Ryszard Wiśniewski
* Copyright (C) 2010 Connor Tumbleson
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package brut.androlib;
import brut.androlib.exceptions.AndrolibException;
import brut.androlib.exceptions.InFileNotFoundException;
import brut.androlib.exceptions.OutDirExistsException;
import brut.androlib.apk.ApkInfo;
import brut.androlib.res.ResourcesDecoder;
import brut.androlib.src.SmaliDecoder;
import brut.directory.Directory;
import brut.directory.ExtFile;
import brut.common.BrutException;
import brut.directory.DirectoryException;
import brut.util.OS;
import com.android.tools.smali.dexlib2.iface.DexFile;
import org.apache.commons.io.FilenameUtils;
import java.io.*;
import java.util.*;
import java.util.logging.Logger;
import java.util.regex.Pattern;
public class ApkDecoder {
private final static Logger LOGGER = Logger.getLogger(ApkDecoder.class.getName());
private final Config mConfig;
private final ApkInfo mApkInfo;
private int mMinSdkVersion = 0;
private final static String SMALI_DIRNAME = "smali";
private final static String UNK_DIRNAME = "unknown";
private final static String[] APK_STANDARD_ALL_FILENAMES = new String[] {
"classes.dex", "AndroidManifest.xml", "resources.arsc", "res", "r", "R",
"lib", "libs", "assets", "META-INF", "kotlin" };
private final static String[] APK_RESOURCES_FILENAMES = new String[] {
"resources.arsc", "res", "r", "R" };
private final static String[] APK_MANIFEST_FILENAMES = new String[] {
"AndroidManifest.xml" };
private final static Pattern NO_COMPRESS_PATTERN = Pattern.compile("(" +
"jpg|jpeg|png|gif|wav|mp2|mp3|ogg|aac|mpg|mpeg|mid|midi|smf|jet|rtttl|imy|xmf|mp4|" +
"m4a|m4v|3gp|3gpp|3g2|3gpp2|amr|awb|wma|wmv|webm|webp|mkv)$");
public ApkDecoder(File apkFile) {
this(Config.getDefaultConfig(), new ExtFile(apkFile));
}
public ApkDecoder(ExtFile apkFile) {
this(Config.getDefaultConfig(), apkFile);
}
public ApkDecoder(Config config, File apkFile) {
this(config, new ExtFile(apkFile));
}
public ApkDecoder(Config config, ExtFile apkFile) {
mConfig = config;
mApkInfo = new ApkInfo(apkFile);
}
public ApkInfo decode(File outDir) throws AndrolibException, IOException, DirectoryException {
ExtFile apkFile = mApkInfo.getApkFile();
try {
if (!mConfig.forceDelete && outDir.exists()) {
throw new OutDirExistsException();
}
if (!apkFile.isFile() || !apkFile.canRead()) {
throw new InFileNotFoundException();
}
try {
OS.rmdir(outDir);
} catch (BrutException ex) {
throw new AndrolibException(ex);
}
//noinspection ResultOfMethodCallIgnored
outDir.mkdirs();
LOGGER.info("Using Apktool " + ApktoolProperties.getVersion() + " on " + mApkInfo.apkFileName);
ResourcesDecoder resourcesDecoder = new ResourcesDecoder(mConfig, mApkInfo);
if (mApkInfo.hasResources()) {
switch (mConfig.decodeResources) {
case Config.DECODE_RESOURCES_NONE:
copyResourcesRaw(outDir);
break;
case Config.DECODE_RESOURCES_FULL:
resourcesDecoder.decodeResources(outDir);
break;
}
}
if (mApkInfo.hasManifest()) {
if (mConfig.decodeResources == Config.DECODE_RESOURCES_FULL ||
mConfig.forceDecodeManifest == Config.FORCE_DECODE_MANIFEST_FULL) {
resourcesDecoder.decodeManifest(outDir);
}
else {
copyManifestRaw(outDir);
}
}
resourcesDecoder.updateApkInfo(outDir);
if (mApkInfo.hasSources()) {
switch (mConfig.decodeSources) {
case Config.DECODE_SOURCES_NONE:
copySourcesRaw(outDir, "classes.dex");
break;
case Config.DECODE_SOURCES_SMALI:
case Config.DECODE_SOURCES_SMALI_ONLY_MAIN_CLASSES:
decodeSourcesSmali(outDir, "classes.dex");
break;
}
}
if (mApkInfo.hasMultipleSources()) {
// foreach unknown dex file in root, lets disassemble it
Set files = apkFile.getDirectory().getFiles(true);
for (String file : files) {
if (file.endsWith(".dex")) {
if (!file.equalsIgnoreCase("classes.dex")) {
switch(mConfig.decodeSources) {
case Config.DECODE_SOURCES_NONE:
copySourcesRaw(outDir, file);
break;
case Config.DECODE_SOURCES_SMALI:
decodeSourcesSmali(outDir, file);
break;
case Config.DECODE_SOURCES_SMALI_ONLY_MAIN_CLASSES:
if (file.startsWith("classes") && file.endsWith(".dex")) {
decodeSourcesSmali(outDir, file);
} else {
copySourcesRaw(outDir, file);
}
break;
}
}
}
}
}
// In case we have no resources. We should store the minSdk we pulled from the source opcode api level
if (!mApkInfo.hasResources() && mMinSdkVersion > 0) {
mApkInfo.setSdkInfoField("minSdkVersion", Integer.toString(mMinSdkVersion));
}
copyRawFiles(outDir);
copyUnknownFiles(outDir);
recordUncompressedFiles(resourcesDecoder.getResFileMapping());
copyOriginalFiles(outDir);
writeApkInfo(outDir);
return mApkInfo;
} finally {
try {
apkFile.close();
} catch (IOException ignored) {}
}
}
private void writeApkInfo(File outDir) throws AndrolibException {
mApkInfo.save(new File(outDir, "apktool.yml"));
}
private void copyManifestRaw(File outDir) throws AndrolibException {
try {
LOGGER.info("Copying raw manifest...");
mApkInfo.getApkFile().getDirectory().copyToDir(outDir, APK_MANIFEST_FILENAMES);
} catch (DirectoryException ex) {
throw new AndrolibException(ex);
}
}
private void copyResourcesRaw(File outDir) throws AndrolibException {
try {
LOGGER.info("Copying raw resources...");
mApkInfo.getApkFile().getDirectory().copyToDir(outDir, APK_RESOURCES_FILENAMES);
} catch (DirectoryException ex) {
throw new AndrolibException(ex);
}
}
private void copySourcesRaw(File outDir, String filename) throws AndrolibException {
try {
LOGGER.info("Copying raw " + filename + " file...");
mApkInfo.getApkFile().getDirectory().copyToDir(outDir, filename);
} catch (DirectoryException ex) {
throw new AndrolibException(ex);
}
}
private void decodeSourcesSmali(File outDir, String filename) throws AndrolibException {
try {
File smaliDir;
if (filename.equalsIgnoreCase("classes.dex")) {
smaliDir = new File(outDir, SMALI_DIRNAME);
} else {
smaliDir = new File(outDir, SMALI_DIRNAME + "_" + filename.substring(0, filename.indexOf(".")));
}
OS.rmdir(smaliDir);
//noinspection ResultOfMethodCallIgnored
smaliDir.mkdirs();
LOGGER.info("Baksmaling " + filename + "...");
DexFile dexFile = SmaliDecoder.decode(mApkInfo.getApkFile(), smaliDir, filename,
mConfig.baksmaliDebugMode, mConfig.apiLevel);
int minSdkVersion = dexFile.getOpcodes().api;
if (mMinSdkVersion == 0 || mMinSdkVersion > minSdkVersion) {
mMinSdkVersion = minSdkVersion;
}
} catch (BrutException ex) {
throw new AndrolibException(ex);
}
}
private void copyRawFiles(File outDir) throws AndrolibException {
LOGGER.info("Copying assets and libs...");
try {
Directory in = mApkInfo.getApkFile().getDirectory();
if (mConfig.decodeAssets == Config.DECODE_ASSETS_FULL) {
if (in.containsDir("assets")) {
in.copyToDir(outDir, "assets");
}
}
if (in.containsDir("lib")) {
in.copyToDir(outDir, "lib");
}
if (in.containsDir("libs")) {
in.copyToDir(outDir, "libs");
}
if (in.containsDir("kotlin")) {
in.copyToDir(outDir, "kotlin");
}
} catch (DirectoryException ex) {
throw new AndrolibException(ex);
}
}
private boolean isAPKFileNames(String file) {
for (String apkFile : APK_STANDARD_ALL_FILENAMES) {
if (apkFile.equals(file) || file.startsWith(apkFile + "/")) {
return true;
}
}
return false;
}
private void copyUnknownFiles(File outDir) throws AndrolibException {
LOGGER.info("Copying unknown files...");
File unknownOut = new File(outDir, UNK_DIRNAME);
try {
Directory unk = mApkInfo.getApkFile().getDirectory();
// loop all items in container recursively, ignoring any that are pre-defined by aapt
Set files = unk.getFiles(true);
for (String file : files) {
if (!isAPKFileNames(file) && !file.endsWith(".dex")) {
// copy file out of archive into special "unknown" folder
unk.copyToDir(unknownOut, file);
// let's record the name of the file, and its compression type
// so that we may re-include it the same way
mApkInfo.addUnknownFileInfo(file, String.valueOf(unk.getCompressionLevel(file)));
}
}
} catch (DirectoryException ex) {
throw new AndrolibException(ex);
}
}
private void copyOriginalFiles(File outDir) throws AndrolibException {
LOGGER.info("Copying original files...");
File originalDir = new File(outDir, "original");
if (!originalDir.exists()) {
//noinspection ResultOfMethodCallIgnored
originalDir.mkdirs();
}
try {
Directory in = mApkInfo.getApkFile().getDirectory();
if (in.containsFile("AndroidManifest.xml")) {
in.copyToDir(originalDir, "AndroidManifest.xml");
}
if (in.containsFile("stamp-cert-sha256")) {
in.copyToDir(originalDir, "stamp-cert-sha256");
}
if (in.containsDir("META-INF")) {
in.copyToDir(originalDir, "META-INF");
if (in.containsDir("META-INF/services")) {
// If the original APK contains the folder META-INF/services folder
// that is used for service locators (like coroutines on android),
// copy it to the destination folder, so it does not get dropped.
LOGGER.info("Copying META-INF/services directory");
in.copyToDir(outDir, "META-INF/services");
}
}
} catch (DirectoryException ex) {
throw new AndrolibException(ex);
}
}
private void recordUncompressedFiles(Map resFileMapping) throws AndrolibException {
try {
List uncompressedFilesOrExts = new ArrayList<>();
Directory unk = mApkInfo.getApkFile().getDirectory();
Set files = unk.getFiles(true);
for (String file : files) {
if (isAPKFileNames(file) && unk.getCompressionLevel(file) == 0) {
String extOrFile = "";
if (unk.getSize(file) != 0) {
extOrFile = FilenameUtils.getExtension(file);
}
if (extOrFile.isEmpty() || !NO_COMPRESS_PATTERN.matcher(extOrFile).find()) {
extOrFile = file;
if (resFileMapping.containsKey(extOrFile)) {
extOrFile = resFileMapping.get(extOrFile);
}
}
if (!uncompressedFilesOrExts.contains(extOrFile)) {
uncompressedFilesOrExts.add(extOrFile);
}
}
}
// update apk info
if (!uncompressedFilesOrExts.isEmpty()) {
mApkInfo.doNotCompress = uncompressedFilesOrExts;
}
} catch (DirectoryException ex) {
throw new AndrolibException(ex);
}
}
}
