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      1 /*
      2  * Copyright (C) 2014 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.systemui;
     18 
     19 import android.app.ActivityManagerNative;
     20 import android.app.Dialog;
     21 import android.content.BroadcastReceiver;
     22 import android.content.ContentResolver;
     23 import android.content.Context;
     24 import android.content.DialogInterface;
     25 import android.content.Intent;
     26 import android.content.IntentFilter;
     27 import android.content.pm.UserInfo;
     28 import android.os.RemoteException;
     29 import android.os.UserHandle;
     30 import android.os.UserManager;
     31 import android.provider.Settings;
     32 import android.util.Log;
     33 import android.view.WindowManagerGlobal;
     34 
     35 import com.android.systemui.statusbar.phone.SystemUIDialog;
     36 
     37 /**
     38  * Manages notification when a guest session is resumed.
     39  */
     40 public class GuestResumeSessionReceiver extends BroadcastReceiver {
     41 
     42     private static final String TAG = "GuestResumeSessionReceiver";
     43 
     44     private static final String SETTING_GUEST_HAS_LOGGED_IN = "systemui.guest_has_logged_in";
     45 
     46     private Dialog mNewSessionDialog;
     47 
     48     public void register(Context context) {
     49         IntentFilter f = new IntentFilter(Intent.ACTION_USER_SWITCHED);
     50         context.registerReceiverAsUser(this, UserHandle.SYSTEM,
     51                 f, null /* permission */, null /* scheduler */);
     52     }
     53 
     54     @Override
     55     public void onReceive(Context context, Intent intent) {
     56         String action = intent.getAction();
     57 
     58         if (Intent.ACTION_USER_SWITCHED.equals(action)) {
     59             cancelDialog();
     60 
     61             int userId = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, UserHandle.USER_NULL);
     62             if (userId == UserHandle.USER_NULL) {
     63                 Log.e(TAG, intent + " sent to " + TAG + " without EXTRA_USER_HANDLE");
     64                 return;
     65             }
     66 
     67             UserInfo currentUser;
     68             try {
     69                 currentUser = ActivityManagerNative.getDefault().getCurrentUser();
     70             } catch (RemoteException e) {
     71                 return;
     72             }
     73             if (!currentUser.isGuest()) {
     74                 return;
     75             }
     76 
     77             ContentResolver cr = context.getContentResolver();
     78             int notFirstLogin = Settings.System.getIntForUser(
     79                     cr, SETTING_GUEST_HAS_LOGGED_IN, 0, userId);
     80             if (notFirstLogin != 0) {
     81                 mNewSessionDialog = new ResetSessionDialog(context, userId);
     82                 mNewSessionDialog.show();
     83             } else {
     84                 Settings.System.putIntForUser(
     85                         cr, SETTING_GUEST_HAS_LOGGED_IN, 1, userId);
     86             }
     87         }
     88     }
     89 
     90     /**
     91      * Wipes the guest session.
     92      *
     93      * The guest must be the current user and its id must be {@param userId}.
     94      */
     95     private static void wipeGuestSession(Context context, int userId) {
     96         UserManager userManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
     97         UserInfo currentUser;
     98         try {
     99             currentUser = ActivityManagerNative.getDefault().getCurrentUser();
    100         } catch (RemoteException e) {
    101             Log.e(TAG, "Couldn't wipe session because ActivityManager is dead");
    102             return;
    103         }
    104         if (currentUser.id != userId) {
    105             Log.w(TAG, "User requesting to start a new session (" + userId + ")"
    106                     + " is not current user (" + currentUser.id + ")");
    107             return;
    108         }
    109         if (!currentUser.isGuest()) {
    110             Log.w(TAG, "User requesting to start a new session (" + userId + ")"
    111                     + " is not a guest");
    112             return;
    113         }
    114 
    115         boolean marked = userManager.markGuestForDeletion(currentUser.id);
    116         if (!marked) {
    117             Log.w(TAG, "Couldn't mark the guest for deletion for user " + userId);
    118             return;
    119         }
    120         UserInfo newGuest = userManager.createGuest(context, currentUser.name);
    121 
    122         try {
    123             if (newGuest == null) {
    124                 Log.e(TAG, "Could not create new guest, switching back to system user");
    125                 ActivityManagerNative.getDefault().switchUser(UserHandle.USER_SYSTEM);
    126                 userManager.removeUser(currentUser.id);
    127                 WindowManagerGlobal.getWindowManagerService().lockNow(null /* options */);
    128                 return;
    129             }
    130             ActivityManagerNative.getDefault().switchUser(newGuest.id);
    131             userManager.removeUser(currentUser.id);
    132         } catch (RemoteException e) {
    133             Log.e(TAG, "Couldn't wipe session because ActivityManager or WindowManager is dead");
    134             return;
    135         }
    136     }
    137 
    138     private void cancelDialog() {
    139         if (mNewSessionDialog != null && mNewSessionDialog.isShowing()) {
    140             mNewSessionDialog.cancel();
    141             mNewSessionDialog = null;
    142         }
    143     }
    144 
    145     private static class ResetSessionDialog extends SystemUIDialog implements
    146             DialogInterface.OnClickListener {
    147 
    148         private static final int BUTTON_WIPE = BUTTON_NEGATIVE;
    149         private static final int BUTTON_DONTWIPE = BUTTON_POSITIVE;
    150 
    151         private final int mUserId;
    152 
    153         public ResetSessionDialog(Context context, int userId) {
    154             super(context);
    155 
    156             setTitle(context.getString(R.string.guest_wipe_session_title));
    157             setMessage(context.getString(R.string.guest_wipe_session_message));
    158             setCanceledOnTouchOutside(false);
    159 
    160             setButton(BUTTON_WIPE,
    161                     context.getString(R.string.guest_wipe_session_wipe), this);
    162             setButton(BUTTON_DONTWIPE,
    163                     context.getString(R.string.guest_wipe_session_dontwipe), this);
    164 
    165             mUserId = userId;
    166         }
    167 
    168         @Override
    169         public void onClick(DialogInterface dialog, int which) {
    170             if (which == BUTTON_WIPE) {
    171                 wipeGuestSession(getContext(), mUserId);
    172                 dismiss();
    173             } else if (which == BUTTON_DONTWIPE) {
    174                 cancel();
    175             }
    176         }
    177     }
    178 }
    179