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 static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME; 20 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM; 21 22 import android.app.ActivityManagerNative; 23 import android.app.admin.DevicePolicyManager; 24 import android.content.Context; 25 import android.os.Handler; 26 import android.os.IBinder; 27 import android.os.Message; 28 import android.os.RemoteException; 29 import android.os.TokenWatcher; 30 import android.util.Log; 31 import android.util.Pair; 32 import android.view.WindowManagerPolicy; 33 34 public class KeyguardDisableHandler extends Handler { 35 private static final String TAG = TAG_WITH_CLASS_NAME ? "KeyguardDisableHandler" : TAG_WM; 36 37 private static final int ALLOW_DISABLE_YES = 1; 38 private static final int ALLOW_DISABLE_NO = 0; 39 private static final int ALLOW_DISABLE_UNKNOWN = -1; // check with DevicePolicyManager 40 private int mAllowDisableKeyguard = ALLOW_DISABLE_UNKNOWN; // sync'd by mKeyguardTokenWatcher 41 42 // Message.what constants 43 static final int KEYGUARD_DISABLE = 1; 44 static final int KEYGUARD_REENABLE = 2; 45 static final int KEYGUARD_POLICY_CHANGED = 3; 46 47 final Context mContext; 48 final WindowManagerPolicy mPolicy; 49 KeyguardTokenWatcher mKeyguardTokenWatcher; 50 KeyguardDisableHandler(final Context context, final WindowManagerPolicy policy)51 public KeyguardDisableHandler(final Context context, final WindowManagerPolicy policy) { 52 mContext = context; 53 mPolicy = policy; 54 } 55 56 @SuppressWarnings("unchecked") 57 @Override handleMessage(Message msg)58 public void handleMessage(Message msg) { 59 if (mKeyguardTokenWatcher == null) { 60 mKeyguardTokenWatcher = new KeyguardTokenWatcher(this); 61 } 62 63 switch (msg.what) { 64 case KEYGUARD_DISABLE: 65 final Pair<IBinder, String> pair = (Pair<IBinder, String>)msg.obj; 66 mKeyguardTokenWatcher.acquire(pair.first, pair.second); 67 break; 68 69 case KEYGUARD_REENABLE: 70 mKeyguardTokenWatcher.release((IBinder)msg.obj); 71 break; 72 73 case KEYGUARD_POLICY_CHANGED: 74 mAllowDisableKeyguard = ALLOW_DISABLE_UNKNOWN; 75 if (mKeyguardTokenWatcher.isAcquired()) { 76 // If we are currently disabled we need to know if the keyguard 77 // should be re-enabled, so determine the allow state immediately. 78 mKeyguardTokenWatcher.updateAllowState(); 79 if (mAllowDisableKeyguard != ALLOW_DISABLE_YES) { 80 mPolicy.enableKeyguard(true); 81 } 82 } else { 83 // lazily evaluate this next time we're asked to disable keyguard 84 mPolicy.enableKeyguard(true); 85 } 86 break; 87 } 88 } 89 90 class KeyguardTokenWatcher extends TokenWatcher { 91 KeyguardTokenWatcher(final Handler handler)92 public KeyguardTokenWatcher(final Handler handler) { 93 super(handler, TAG); 94 } 95 updateAllowState()96 public void updateAllowState() { 97 // We fail safe and prevent disabling keyguard in the unlikely event this gets 98 // called before DevicePolicyManagerService has started. 99 DevicePolicyManager dpm = (DevicePolicyManager) mContext.getSystemService( 100 Context.DEVICE_POLICY_SERVICE); 101 if (dpm != null) { 102 try { 103 mAllowDisableKeyguard = dpm.getPasswordQuality(null, 104 ActivityManagerNative.getDefault().getCurrentUser().id) 105 == DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED ? 106 ALLOW_DISABLE_YES : ALLOW_DISABLE_NO; 107 } catch (RemoteException re) { 108 // Nothing much we can do 109 } 110 } 111 } 112 113 @Override acquired()114 public void acquired() { 115 if (mAllowDisableKeyguard == ALLOW_DISABLE_UNKNOWN) { 116 updateAllowState(); 117 } 118 if (mAllowDisableKeyguard == ALLOW_DISABLE_YES) { 119 mPolicy.enableKeyguard(false); 120 } else { 121 Log.v(TAG, "Not disabling keyguard since device policy is enforced"); 122 } 123 } 124 125 @Override released()126 public void released() { 127 mPolicy.enableKeyguard(true); 128 } 129 } 130 } 131