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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.wm;
import android.app.ActivityManagerNative;
import android.app.admin.DevicePolicyManager;
import android.content.Context;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteException;
import android.os.TokenWatcher;
import android.util.Log;
import android.util.Pair;
import android.view.WindowManagerPolicy;
public class KeyguardDisableHandler extends Handler {
private static final String TAG = "KeyguardDisableHandler";
private static final int ALLOW_DISABLE_YES = 1;
private static final int ALLOW_DISABLE_NO = 0;
private static final int ALLOW_DISABLE_UNKNOWN = -1; // check with DevicePolicyManager
private int mAllowDisableKeyguard = ALLOW_DISABLE_UNKNOWN; // sync'd by mKeyguardTokenWatcher
// Message.what constants
static final int KEYGUARD_DISABLE = 1;
static final int KEYGUARD_REENABLE = 2;
static final int KEYGUARD_POLICY_CHANGED = 3;
final Context mContext;
final WindowManagerPolicy mPolicy;
KeyguardTokenWatcher mKeyguardTokenWatcher;
public KeyguardDisableHandler(final Context context, final WindowManagerPolicy policy) {
mContext = context;
mPolicy = policy;
}
@SuppressWarnings("unchecked")
@Override
public void handleMessage(Message msg) {
if (mKeyguardTokenWatcher == null) {
mKeyguardTokenWatcher = new KeyguardTokenWatcher(this);
}
switch (msg.what) {
case KEYGUARD_DISABLE:
final Pair<IBinder, String> pair = (Pair<IBinder, String>)msg.obj;
mKeyguardTokenWatcher.acquire(pair.first, pair.second);
break;
case KEYGUARD_REENABLE:
mKeyguardTokenWatcher.release((IBinder)msg.obj);
break;
case KEYGUARD_POLICY_CHANGED:
mPolicy.enableKeyguard(true);
// lazily evaluate this next time we're asked to disable keyguard
mAllowDisableKeyguard = ALLOW_DISABLE_UNKNOWN;
break;
}
}
class KeyguardTokenWatcher extends TokenWatcher {
public KeyguardTokenWatcher(final Handler handler) {
super(handler, TAG);
}
@Override
public void acquired() {
// We fail safe and prevent disabling keyguard in the unlikely event this gets
// called before DevicePolicyManagerService has started.
if (mAllowDisableKeyguard == ALLOW_DISABLE_UNKNOWN) {
DevicePolicyManager dpm = (DevicePolicyManager) mContext.getSystemService(
Context.DEVICE_POLICY_SERVICE);
if (dpm != null) {
try {
mAllowDisableKeyguard = dpm.getPasswordQuality(null,
ActivityManagerNative.getDefault().getCurrentUser().id)
== DevicePolicyManager.PASSWORD_QUALITY_UNSPECIFIED ?
ALLOW_DISABLE_YES : ALLOW_DISABLE_NO;
} catch (RemoteException re) {
// Nothing much we can do
}
}
}
if (mAllowDisableKeyguard == ALLOW_DISABLE_YES) {
mPolicy.enableKeyguard(false);
} else {
Log.v(TAG, "Not disabling keyguard since device policy is enforced");
}
}
@Override
public void released() {
mPolicy.enableKeyguard(true);
}
}
}
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