| /* |
| * Copyright (C) 2017 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.locksettings.recoverablekeystore; |
| |
| import android.annotation.Nullable; |
| import android.app.PendingIntent; |
| import android.util.ArraySet; |
| import android.util.Log; |
| import android.util.SparseArray; |
| |
| import com.android.internal.annotations.GuardedBy; |
| |
| /** |
| * In memory storage for listeners to be notified when new recovery snapshot is available. This |
| * class is thread-safe. It is used on two threads - the service thread and the thread that runs the |
| * {@link KeySyncTask}. |
| * |
| * @hide |
| */ |
| public class RecoverySnapshotListenersStorage { |
| private static final String TAG = "RecoverySnapshotLstnrs"; |
| |
| @GuardedBy("this") |
| private SparseArray<PendingIntent> mAgentIntents = new SparseArray<>(); |
| |
| @GuardedBy("this") |
| private ArraySet<Integer> mAgentsWithPendingSnapshots = new ArraySet<>(); |
| |
| /** |
| * Sets new listener for the recovery agent, identified by {@code uid}. |
| * |
| * @param recoveryAgentUid uid of the recovery agent. |
| * @param intent PendingIntent which will be triggered when new snapshot is available. |
| */ |
| public synchronized void setSnapshotListener( |
| int recoveryAgentUid, @Nullable PendingIntent intent) { |
| Log.i(TAG, "Registered listener for agent with uid " + recoveryAgentUid); |
| mAgentIntents.put(recoveryAgentUid, intent); |
| |
| if (mAgentsWithPendingSnapshots.contains(recoveryAgentUid)) { |
| Log.i(TAG, "Snapshot already created for agent. Immediately triggering intent."); |
| tryToSendIntent(recoveryAgentUid, intent); |
| } |
| } |
| |
| /** |
| * Returns {@code true} if a listener has been set for the recovery agent. |
| */ |
| public synchronized boolean hasListener(int recoveryAgentUid) { |
| return mAgentIntents.get(recoveryAgentUid) != null; |
| } |
| |
| /** |
| * Notifies recovery agent that new snapshot is available. If a recovery agent has not yet |
| * registered a {@link PendingIntent}, remembers that a snapshot is pending for it, so that |
| * when it does register, that intent is immediately triggered. |
| * |
| * @param recoveryAgentUid uid of recovery agent. |
| */ |
| public synchronized void recoverySnapshotAvailable(int recoveryAgentUid) { |
| PendingIntent intent = mAgentIntents.get(recoveryAgentUid); |
| if (intent == null) { |
| Log.i(TAG, "Snapshot available for agent " + recoveryAgentUid |
| + " but agent has not yet initialized. Will notify agent when it does."); |
| mAgentsWithPendingSnapshots.add(recoveryAgentUid); |
| return; |
| } |
| |
| tryToSendIntent(recoveryAgentUid, intent); |
| } |
| |
| /** |
| * Attempts to send {@code intent} for the recovery agent. If this fails, remembers to notify |
| * the recovery agent immediately if it registers a new intent. |
| */ |
| private synchronized void tryToSendIntent(int recoveryAgentUid, PendingIntent intent) { |
| try { |
| intent.send(); |
| mAgentsWithPendingSnapshots.remove(recoveryAgentUid); |
| Log.d(TAG, "Successfully notified listener."); |
| } catch (PendingIntent.CanceledException e) { |
| Log.e(TAG, |
| "Failed to trigger PendingIntent for " + recoveryAgentUid, |
| e); |
| // As it failed to trigger, trigger immediately if a new intent is registered later. |
| mAgentsWithPendingSnapshots.add(recoveryAgentUid); |
| } |
| } |
| } |