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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.packageinstaller.wear;
     18 
     19 import android.content.Context;
     20 import android.net.Uri;
     21 import android.os.ParcelFileDescriptor;
     22 import android.system.ErrnoException;
     23 import android.system.Os;
     24 import android.text.TextUtils;
     25 import android.util.Log;
     26 
     27 import org.tukaani.xz.LZMAInputStream;
     28 import org.tukaani.xz.XZInputStream;
     29 
     30 import java.io.File;
     31 import java.io.FileOutputStream;
     32 import java.io.IOException;
     33 import java.io.InputStream;
     34 
     35 public class WearPackageUtil {
     36     private static final String TAG = "WearablePkgInstaller";
     37 
     38     private static final String COMPRESSION_LZMA = "lzma";
     39     private static final String COMPRESSION_XZ = "xz";
     40 
     41     public static File getTemporaryFile(Context context, String packageName) {
     42         try {
     43             File newFileDir = new File(context.getFilesDir(), "tmp");
     44             newFileDir.mkdirs();
     45             Os.chmod(newFileDir.getAbsolutePath(), 0771);
     46             File newFile = new File(newFileDir, packageName + ".apk");
     47             return newFile;
     48         }   catch (ErrnoException e) {
     49             Log.e(TAG, "Failed to open.", e);
     50             return null;
     51         }
     52     }
     53 
     54     public static File getIconFile(final Context context, final String packageName) {
     55         try {
     56             File newFileDir = new File(context.getFilesDir(), "images/icons");
     57             newFileDir.mkdirs();
     58             Os.chmod(newFileDir.getAbsolutePath(), 0771);
     59             return new File(newFileDir, packageName + ".icon");
     60         }   catch (ErrnoException e) {
     61             Log.e(TAG, "Failed to open.", e);
     62             return null;
     63         }
     64     }
     65 
     66     /**
     67      * In order to make sure that the Wearable Asset Manager has a reasonable apk that can be used
     68      * by the PackageManager, we will parse it before sending it to the PackageManager.
     69      * Unfortunately, PackageParser needs a file to parse. So, we have to temporarily convert the fd
     70      * to a File.
     71      *
     72      * @param context
     73      * @param fd FileDescriptor to convert to File
     74      * @param packageName Name of package, will define the name of the file
     75      * @param compressionAlg Can be null. For ALT mode the APK will be compressed. We will
     76      *                       decompress it here
     77      */
     78     public static File getFileFromFd(Context context, ParcelFileDescriptor fd,
     79             String packageName, String compressionAlg) {
     80         File newFile = getTemporaryFile(context, packageName);
     81         if (fd == null || fd.getFileDescriptor() == null)  {
     82             return null;
     83         }
     84         InputStream fr = new ParcelFileDescriptor.AutoCloseInputStream(fd);
     85         try {
     86             if (TextUtils.equals(compressionAlg, COMPRESSION_XZ)) {
     87                 fr = new XZInputStream(fr);
     88             } else if (TextUtils.equals(compressionAlg, COMPRESSION_LZMA)) {
     89                 fr = new LZMAInputStream(fr);
     90             }
     91         } catch (IOException e) {
     92             Log.e(TAG, "Compression was set to " + compressionAlg + ", but could not decode ", e);
     93             return null;
     94         }
     95 
     96         int nRead;
     97         byte[] data = new byte[1024];
     98         try {
     99             final FileOutputStream fo = new FileOutputStream(newFile);
    100             while ((nRead = fr.read(data, 0, data.length)) != -1) {
    101                 fo.write(data, 0, nRead);
    102             }
    103             fo.flush();
    104             fo.close();
    105             Os.chmod(newFile.getAbsolutePath(), 0644);
    106             return newFile;
    107         } catch (IOException e) {
    108             Log.e(TAG, "Reading from Asset FD or writing to temp file failed ", e);
    109             return null;
    110         }   catch (ErrnoException e) {
    111             Log.e(TAG, "Could not set permissions on file ", e);
    112             return null;
    113         } finally {
    114             try {
    115                 fr.close();
    116             } catch (IOException e) {
    117                 Log.e(TAG, "Failed to close the file from FD ", e);
    118             }
    119         }
    120     }
    121 
    122     /**
    123      * @return com.google.com from expected formats like
    124      * Uri: package:com.google.com, package:/com.google.com, package://com.google.com
    125      */
    126     public static String getSanitizedPackageName(Uri packageUri) {
    127         String packageName = packageUri.getEncodedSchemeSpecificPart();
    128         if (packageName != null) {
    129             return packageName.replaceAll("^/+", "");
    130         }
    131         return packageName;
    132     }
    133 }
    134