| /* |
| * Copyright (C) 2020 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.internal.content.om; |
| |
| import static com.android.internal.content.om.OverlayConfig.TAG; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.content.pm.PackageParser; |
| import android.util.ArrayMap; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.io.File; |
| import java.util.Collection; |
| |
| /** |
| * This class scans a directory containing overlay APKs and extracts information from the overlay |
| * manifests by parsing the overlay manifests. |
| */ |
| @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE) |
| public class OverlayScanner { |
| |
| /** Represents information parsed from the manifest of an overlay. */ |
| public static class ParsedOverlayInfo { |
| public final String packageName; |
| public final String targetPackageName; |
| public final int targetSdkVersion; |
| public final boolean isStatic; |
| public final int priority; |
| public final File path; |
| |
| public ParsedOverlayInfo(String packageName, String targetPackageName, |
| int targetSdkVersion, boolean isStatic, int priority, File path) { |
| this.packageName = packageName; |
| this.targetPackageName = targetPackageName; |
| this.targetSdkVersion = targetSdkVersion; |
| this.isStatic = isStatic; |
| this.priority = priority; |
| this.path = path; |
| } |
| |
| @Override |
| public String toString() { |
| return getClass().getSimpleName() + String.format("{packageName=%s" |
| + ", targetPackageName=%s, targetSdkVersion=%s, isStatic=%s" |
| + ", priority=%s, path=%s}", |
| packageName, targetPackageName, targetSdkVersion, isStatic, priority, path); |
| } |
| } |
| |
| /** |
| * A map of overlay package name to the parsed manifest information of the latest version of |
| * the overlay. |
| */ |
| private final ArrayMap<String, ParsedOverlayInfo> mParsedOverlayInfos = new ArrayMap<>(); |
| |
| /** Retrieves information parsed from the overlay with the package name. */ |
| @Nullable |
| public final ParsedOverlayInfo getParsedInfo(String packageName) { |
| return mParsedOverlayInfos.get(packageName); |
| } |
| |
| /** Retrieves all of the scanned overlays. */ |
| @NonNull |
| final Collection<ParsedOverlayInfo> getAllParsedInfos() { |
| return mParsedOverlayInfos.values(); |
| } |
| |
| /** |
| * Recursively searches the directory for overlay APKs. If an overlay is found with the same |
| * package name as a previously scanned overlay, the info of the new overlay will replace the |
| * info of the previously scanned overlay. |
| */ |
| public void scanDir(File partitionOverlayDir) { |
| if (!partitionOverlayDir.exists() || !partitionOverlayDir.isDirectory()) { |
| return; |
| } |
| |
| if (!partitionOverlayDir.canRead()) { |
| Log.w(TAG, "Directory " + partitionOverlayDir + " cannot be read"); |
| return; |
| } |
| |
| final File[] files = partitionOverlayDir.listFiles(); |
| if (files == null) { |
| return; |
| } |
| |
| for (int i = 0; i < files.length; i++) { |
| final File f = files[i]; |
| if (f.isDirectory()) { |
| scanDir(f); |
| } |
| |
| if (!f.isFile() || !f.getPath().endsWith(".apk")) { |
| continue; |
| } |
| |
| final ParsedOverlayInfo info = parseOverlayManifest(f); |
| if (info == null) { |
| continue; |
| } |
| |
| mParsedOverlayInfos.put(info.packageName, info); |
| } |
| } |
| |
| /** Extracts information about the overlay from its manifest. */ |
| @VisibleForTesting |
| public ParsedOverlayInfo parseOverlayManifest(File overlayApk) { |
| try { |
| final PackageParser.ApkLite apkLite = PackageParser.parseApkLite(overlayApk, 0); |
| return apkLite.targetPackageName == null ? null : |
| new ParsedOverlayInfo(apkLite.packageName, apkLite.targetPackageName, |
| apkLite.targetSdkVersion, apkLite.overlayIsStatic, |
| apkLite.overlayPriority, new File(apkLite.codePath)); |
| } catch (PackageParser.PackageParserException e) { |
| Log.w(TAG, "Got exception loading overlay.", e); |
| return null; |
| } |
| } |
| } |