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.os.UserHandle; 28 import android.util.Log; 29 import android.util.Pair; 30 import android.view.WindowManagerPolicy; 31 32 public class KeyguardDisableHandler extends Handler { 33 private static final String TAG = "KeyguardDisableHandler"; 34 35 private static final int ALLOW_DISABLE_YES = 1; 36 private static final int ALLOW_DISABLE_NO = 0; 37 private static final int ALLOW_DISABLE_UNKNOWN = -1; // check with DevicePolicyManager 38 private int mAllowDisableKeyguard = ALLOW_DISABLE_UNKNOWN; // sync'd by mKeyguardTokenWatcher 39 40 // Message.what constants 41 static final int KEYGUARD_DISABLE = 1; 42 static final int KEYGUARD_REENABLE = 2; 43 static final int KEYGUARD_POLICY_CHANGED = 3; 44 45 final Context mContext; 46 final WindowManagerPolicy mPolicy; 47 KeyguardTokenWatcher mKeyguardTokenWatcher; 48 KeyguardDisableHandler(final Context context, final WindowManagerPolicy policy)49 public KeyguardDisableHandler(final Context context, final WindowManagerPolicy policy) { 50 mContext = context; 51 mPolicy = policy; 52 } 53 54 @SuppressWarnings("unchecked") 55 @Override handleMessage(Message msg)56 public void handleMessage(Message msg) { 57 if (mKeyguardTokenWatcher == null) { 58 mKeyguardTokenWatcher = new KeyguardTokenWatcher(this); 59 } 60 61 switch (msg.what) { 62 case KEYGUARD_DISABLE: 63 final Pair<IBinder, String> pair = (Pair<IBinder, String>)msg.obj; 64 mKeyguardTokenWatcher.acquire(pair.first, pair.second); 65 break; 66 67 case KEYGUARD_REENABLE: 68 mKeyguardTokenWatcher.release((IBinder)msg.obj); 69 break; 70 71 case KEYGUARD_POLICY_CHANGED: 72 mPolicy.enableKeyguard(true); 73 // lazily evaluate this next time we're asked to disable keyguard 74 mAllowDisableKeyguard = ALLOW_DISABLE_UNKNOWN; 75 break; 76 } 77 } 78 79 class KeyguardTokenWatcher extends TokenWatcher { 80 KeyguardTokenWatcher(final Handler handler)81 public KeyguardTokenWatcher(final Handler handler) { 82 super(handler, TAG); 83 } 84 85 @Override acquired()86 public void acquired() { 87 // We fail safe and prevent disabling keyguard in the unlikely event this gets 88 // called before DevicePolicyManagerService has started. 89 if (mAllowDisableKeyguard == ALLOW_DISABLE_UNKNOWN) { 90 DevicePolicyManager dpm = (DevicePolicyManager) mContext.getSystemService( 91 Context.DEVICE_POLICY_SERVICE); 92 if (dpm != null) { 93 try { 94 mAllowDisableKeyguard = dpm.getPasswordQuality(null, 95 ActivityManagerNative.getDefault().getCurrentUser().id) 96 == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED ? 97 ALLOW_DISABLE_YES : ALLOW_DISABLE_NO; 98 } catch (RemoteException re) { 99 // Nothing much we can do 100 } 101 } 102 } 103 if (mAllowDisableKeyguard == ALLOW_DISABLE_YES) { 104 mPolicy.enableKeyguard(false); 105 } else { 106 Log.v(TAG, "Not disabling keyguard since device policy is enforced"); 107 } 108 } 109 110 @Override released()111 public void released() { 112 mPolicy.enableKeyguard(true); 113 } 114 } 115 } 116