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      1 /*
      2  * Copyright (C) 2017 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 package com.example.android.autofill.service.data.source.local;
     17 
     18 import android.content.Context;
     19 import android.content.SharedPreferences;
     20 import android.content.pm.PackageInfo;
     21 import android.content.pm.PackageManager;
     22 
     23 import com.example.android.autofill.service.data.source.PackageVerificationDataSource;
     24 import com.example.android.autofill.service.util.SecurityHelper;
     25 
     26 import static com.example.android.autofill.service.util.Util.logd;
     27 import static com.example.android.autofill.service.util.Util.logw;
     28 
     29 public class SharedPrefsPackageVerificationRepository implements PackageVerificationDataSource {
     30 
     31     private static final String SHARED_PREF_KEY = "com.example.android.autofill.service"
     32             + ".datasource.PackageVerificationDataSource";
     33     private static PackageVerificationDataSource sInstance;
     34 
     35     private final SharedPreferences mSharedPrefs;
     36     private final Context mContext;
     37 
     38     private SharedPrefsPackageVerificationRepository(Context context) {
     39         mSharedPrefs = context.getApplicationContext()
     40                 .getSharedPreferences(SHARED_PREF_KEY, Context.MODE_PRIVATE);
     41         mContext = context.getApplicationContext();
     42     }
     43 
     44     public static PackageVerificationDataSource getInstance(Context context) {
     45         if (sInstance == null) {
     46             sInstance = new SharedPrefsPackageVerificationRepository(
     47                     context.getApplicationContext());
     48         }
     49         return sInstance;
     50     }
     51 
     52     @Override
     53     public void clear() {
     54         mSharedPrefs.edit().clear().apply();
     55     }
     56 
     57     @Override
     58     public boolean putPackageSignatures(String packageName) {
     59         String hash;
     60         try {
     61             PackageManager pm = mContext.getPackageManager();
     62             PackageInfo packageInfo = pm.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
     63             hash = SecurityHelper.getFingerprint(packageInfo, packageName);
     64             logd("Hash for %s: %s", packageName, hash);
     65         } catch (Exception e) {
     66             logw(e, "Error getting hash for %s.", packageName);
     67             return false;
     68         }
     69 
     70         if (!containsSignatureForPackage(packageName)) {
     71             // Storage does not yet contain signature for this package name.
     72             mSharedPrefs.edit().putString(packageName, hash).apply();
     73             return true;
     74         }
     75         return containsMatchingSignatureForPackage(packageName, hash);
     76     }
     77 
     78     private boolean containsSignatureForPackage(String packageName) {
     79         return mSharedPrefs.contains(packageName);
     80     }
     81 
     82     private boolean containsMatchingSignatureForPackage(String packageName,
     83             String hash) {
     84         return hash.equals(mSharedPrefs.getString(packageName, null));
     85     }
     86 }
     87