KeyguardDisableHandler.java revision 599dd7ce9adf8ca067cefb0b191a5ac20ec35a79 
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
17package com.android.server.wm;
18
19import android.app.ActivityManagerNative;
20import android.app.admin.DevicePolicyManager;
21import android.content.Context;
22import android.os.Handler;
23import android.os.IBinder;
24import android.os.Message;
25import android.os.RemoteException;
26import android.os.TokenWatcher;
27import android.os.UserHandle;
28import android.util.Log;
29import android.util.Pair;
30import android.view.WindowManagerPolicy;
31
32public 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
49    public KeyguardDisableHandler(final Context context, final WindowManagerPolicy policy) {
50        mContext = context;
51        mPolicy = policy;
52    }
53
54    @SuppressWarnings("unchecked")
55    @Override
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
81        public KeyguardTokenWatcher(final Handler handler) {
82            super(handler, TAG);
83        }
84
85        @Override
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
111        public void released() {
112            mPolicy.enableKeyguard(true);
113        }
114    }
115}
116