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      1 /*
      2  * Copyright (C) 2012 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.server.wm;
     18 
     19 import android.app.ActivityManagerNative;
     20 import android.app.admin.DevicePolicyManager;
     21 import android.content.Context;
     22 import android.os.Handler;
     23 import android.os.IBinder;
     24 import android.os.Message;
     25 import android.os.RemoteException;
     26 import android.os.TokenWatcher;
     27 import android.util.Log;
     28 import android.util.Pair;
     29 import android.view.WindowManagerPolicy;
     30 
     31 public class KeyguardDisableHandler extends Handler {
     32     private static final String TAG = "KeyguardDisableHandler";
     33 
     34     private static final int ALLOW_DISABLE_YES = 1;
     35     private static final int ALLOW_DISABLE_NO = 0;
     36     private static final int ALLOW_DISABLE_UNKNOWN = -1; // check with DevicePolicyManager
     37     private int mAllowDisableKeyguard = ALLOW_DISABLE_UNKNOWN; // sync'd by mKeyguardTokenWatcher
     38 
     39     // Message.what constants
     40     static final int KEYGUARD_DISABLE = 1;
     41     static final int KEYGUARD_REENABLE = 2;
     42     static final int KEYGUARD_POLICY_CHANGED = 3;
     43 
     44     final Context mContext;
     45     final WindowManagerPolicy mPolicy;
     46     KeyguardTokenWatcher mKeyguardTokenWatcher;
     47 
     48     public KeyguardDisableHandler(final Context context, final WindowManagerPolicy policy) {
     49         mContext = context;
     50         mPolicy = policy;
     51     }
     52 
     53     @SuppressWarnings("unchecked")
     54     @Override
     55     public void handleMessage(Message msg) {
     56         if (mKeyguardTokenWatcher == null) {
     57             mKeyguardTokenWatcher = new KeyguardTokenWatcher(this);
     58         }
     59 
     60         switch (msg.what) {
     61             case KEYGUARD_DISABLE:
     62                 final Pair<IBinder, String> pair = (Pair<IBinder, String>)msg.obj;
     63                 mKeyguardTokenWatcher.acquire(pair.first, pair.second);
     64                 break;
     65 
     66             case KEYGUARD_REENABLE:
     67                 mKeyguardTokenWatcher.release((IBinder)msg.obj);
     68                 break;
     69 
     70             case KEYGUARD_POLICY_CHANGED:
     71                 mPolicy.enableKeyguard(true);
     72                 // lazily evaluate this next time we're asked to disable keyguard
     73                 mAllowDisableKeyguard = ALLOW_DISABLE_UNKNOWN;
     74                 break;
     75         }
     76     }
     77 
     78     class KeyguardTokenWatcher extends TokenWatcher {
     79 
     80         public KeyguardTokenWatcher(final Handler handler) {
     81             super(handler, TAG);
     82         }
     83 
     84         @Override
     85         public void acquired() {
     86             // We fail safe and prevent disabling keyguard in the unlikely event this gets
     87             // called before DevicePolicyManagerService has started.
     88             if (mAllowDisableKeyguard == ALLOW_DISABLE_UNKNOWN) {
     89                 DevicePolicyManager dpm = (DevicePolicyManager) mContext.getSystemService(
     90                         Context.DEVICE_POLICY_SERVICE);
     91                 if (dpm != null) {
     92                     try {
     93                         mAllowDisableKeyguard = dpm.getPasswordQuality(null,
     94                                 ActivityManagerNative.getDefault().getCurrentUser().id)
     95                                 == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED ?
     96                                         ALLOW_DISABLE_YES : ALLOW_DISABLE_NO;
     97                     } catch (RemoteException re) {
     98                         // Nothing much we can do
     99                     }
    100                 }
    101             }
    102             if (mAllowDisableKeyguard == ALLOW_DISABLE_YES) {
    103                 mPolicy.enableKeyguard(false);
    104             } else {
    105                 Log.v(TAG, "Not disabling keyguard since device policy is enforced");
    106             }
    107         }
    108 
    109         @Override
    110         public void released() {
    111             mPolicy.enableKeyguard(true);
    112         }
    113     }
    114 }
    115