src/com/owncloud/android/authentication/PassCodeManager.java

   1 /**
   2  *   ownCloud Android client application
   3  *
   4  *   @author David A. Velasco
   5  *   Copyright (C) 2015 ownCloud Inc.
   6  *
   7  *   This program is free software: you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License version 2,
   9  *   as published by the Free Software Foundation.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20 package com.owncloud.android.authentication;
  21
  22 import android.app.Activity;
  23 import android.content.Context;
  24 import android.content.Intent;
  25 import android.content.SharedPreferences;
  26 import android.os.PowerManager;
  27 import android.preference.PreferenceManager;
  28 import android.view.WindowManager;
  29
  30 import com.owncloud.android.MainApp;
  31 import com.owncloud.android.ui.activity.PassCodeActivity;
  32
  33 import java.util.HashSet;
  34 import java.util.Set;
  35
  36 public class PassCodeManager {
  37
  38     private static final Set<Class> sExemptOfPasscodeActivites;
  39
  40     static {
  41         sExemptOfPasscodeActivites = new HashSet<Class>();
  42         sExemptOfPasscodeActivites.add(PassCodeActivity.class);
  43         // other activities may be exempted, if needed
  44     }
  45
  46     private static int PASS_CODE_TIMEOUT = 1000;
  47         // keeping a "low" positive value is the easiest way to prevent the pass code is requested on rotations
  48
  49     public static PassCodeManager mPassCodeManagerInstance = null;
  50
  51     public static PassCodeManager getPassCodeManager() {
  52         if (mPassCodeManagerInstance == null) {
  53             mPassCodeManagerInstance = new PassCodeManager();
  54         }
  55         return mPassCodeManagerInstance;
  56     }
  57
  58     private Long mTimestamp = 0l;
  59     private int mVisibleActivitiesCounter = 0;
  60
  61     protected PassCodeManager() {};
  62
  63     public void onActivityCreated(Activity activity) {
  64         if (passCodeIsEnabled()) {
  65             activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
  66         } else {
  67             activity.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);
  68         }
  69     }
  70
  71     public void onActivityStarted(Activity activity) {
  72         if (!sExemptOfPasscodeActivites.contains(activity.getClass()) &&
  73                 passCodeShouldBeRequested()
  74                 ){
  75
  76             Intent i = new Intent(MainApp.getAppContext(), PassCodeActivity.class);
  77             i.setAction(PassCodeActivity.ACTION_REQUEST);
  78             i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
  79             activity.startActivity(i);
  80
  81         }
  82
  83         mVisibleActivitiesCounter++;    // keep it AFTER passCodeShouldBeRequested was checked
  84     }
  85
  86     public void onActivityStopped(Activity activity) {
  87         if (mVisibleActivitiesCounter > 0) {
  88             mVisibleActivitiesCounter--;
  89         }
  90         setUnlockTimestamp();
  91         PowerManager powerMgr = (PowerManager) activity.getSystemService(Context.POWER_SERVICE);
  92         if (passCodeIsEnabled() && powerMgr != null && !powerMgr.isScreenOn()) {
  93             activity.moveTaskToBack(true);
  94         }
  95     }
  96
  97     private void setUnlockTimestamp() {
  98         mTimestamp = System.currentTimeMillis();
  99     }
 100
 101     private boolean passCodeShouldBeRequested(){
 102         if ((System.currentTimeMillis() - mTimestamp) > PASS_CODE_TIMEOUT &&
 103                 mVisibleActivitiesCounter <= 0
 104                 ){
 105             return passCodeIsEnabled();
 106         }
 107         return false;
 108     }
 109
 110     private boolean passCodeIsEnabled() {
 111         SharedPreferences appPrefs = PreferenceManager.getDefaultSharedPreferences(MainApp.getAppContext());
 112         return (appPrefs.getBoolean("set_pincode", false));
 113     }
 114
 115 }