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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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
*
* http://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 com.android.compatibility.common.util;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.support.test.InstrumentationRegistry;
import android.util.Log;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Device-side utility class for PackageManager-related operations
*/
public class PackageUtil {
private static final String TAG = PackageUtil.class.getSimpleName();
private static final int SYSTEM_APP_MASK =
ApplicationInfo.FLAG_SYSTEM | ApplicationInfo.FLAG_UPDATED_SYSTEM_APP;
private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
/** Returns true if a package with the given name exists on the device */
public static boolean exists(String packageName) {
try {
return (getPackageManager().getApplicationInfo(packageName,
PackageManager.GET_META_DATA) != null);
} catch(PackageManager.NameNotFoundException e) {
return false;
}
}
/** Returns true if a package with the given name AND SHA digest exists on the device */
public static boolean exists(String packageName, String sha) {
try {
if (getPackageManager().getApplicationInfo(
packageName, PackageManager.GET_META_DATA) == null) {
return false;
}
return sha.equals(computePackageSignatureDigest(packageName));
} catch (NoSuchAlgorithmException | PackageManager.NameNotFoundException e) {
return false;
}
}
/** Returns true if the app for the given package name is a system app for this device */
public static boolean isSystemApp(String packageName) {
try {
ApplicationInfo ai = getPackageManager().getApplicationInfo(packageName,
PackageManager.GET_META_DATA);
return ai != null && ((ai.flags & SYSTEM_APP_MASK) != 0);
} catch(PackageManager.NameNotFoundException e) {
return false;
}
}
/** Returns the version string of the package name, or null if the package can't be found */
public static String getVersionString(String packageName) {
try {
PackageInfo info = getPackageManager().getPackageInfo(packageName,
PackageManager.GET_META_DATA);
return info.versionName;
} catch (PackageManager.NameNotFoundException | NullPointerException e) {
Log.w(TAG, "Could not find version string for package " + packageName);
return null;
}
}
/**
* Compute the signature SHA digest for a package.
* @param package the name of the package for which the signature SHA digest is requested
* @return the signature SHA digest
*/
public static String computePackageSignatureDigest(String packageName)
throws NoSuchAlgorithmException, PackageManager.NameNotFoundException {
PackageInfo packageInfo = getPackageManager()
.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
MessageDigest messageDigest = MessageDigest.getInstance("SHA256");
messageDigest.update(packageInfo.signatures[0].toByteArray());
final byte[] digest = messageDigest.digest();
final int digestLength = digest.length;
final int charCount = 3 * digestLength - 1;
final char[] chars = new char[charCount];
for (int i = 0; i < digestLength; i++) {
final int byteHex = digest[i] & 0xFF;
chars[i * 3] = HEX_ARRAY[byteHex >>> 4];
chars[i * 3 + 1] = HEX_ARRAY[byteHex & 0x0F];
if (i < digestLength - 1) {
chars[i * 3 + 2] = ':';
}
}
return new String(chars);
}
private static PackageManager getPackageManager() {
return InstrumentationRegistry.getInstrumentation().getTargetContext().getPackageManager();
}
}
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