| /* |
| * 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.slice; |
| |
| import android.app.slice.SliceProvider; |
| import android.app.slice.SliceSpec; |
| import android.content.ContentProviderClient; |
| import android.net.Uri; |
| import android.os.Binder; |
| import android.os.Bundle; |
| import android.os.IBinder; |
| import android.os.IBinder.DeathRecipient; |
| import android.os.RemoteException; |
| import android.util.ArrayMap; |
| import android.util.ArraySet; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** |
| * Manages the state of a pinned slice. |
| */ |
| public class PinnedSliceState { |
| |
| private static final long SLICE_TIMEOUT = 5000; |
| private static final String TAG = "PinnedSliceState"; |
| |
| private final Object mLock; |
| |
| private final SliceManagerService mService; |
| private final Uri mUri; |
| @GuardedBy("mLock") |
| private final ArraySet<String> mPinnedPkgs = new ArraySet<>(); |
| @GuardedBy("mLock") |
| private final ArrayMap<IBinder, ListenerInfo> mListeners = new ArrayMap<>(); |
| private final String mPkg; |
| @GuardedBy("mLock") |
| private SliceSpec[] mSupportedSpecs = null; |
| |
| private final DeathRecipient mDeathRecipient = this::handleRecheckListeners; |
| private boolean mSlicePinned; |
| |
| public PinnedSliceState(SliceManagerService service, Uri uri, String pkg) { |
| mService = service; |
| mUri = uri; |
| mPkg = pkg; |
| mLock = mService.getLock(); |
| } |
| |
| public String getPkg() { |
| return mPkg; |
| } |
| |
| public SliceSpec[] getSpecs() { |
| return mSupportedSpecs; |
| } |
| |
| public void mergeSpecs(SliceSpec[] supportedSpecs) { |
| synchronized (mLock) { |
| if (mSupportedSpecs == null) { |
| mSupportedSpecs = supportedSpecs; |
| } else { |
| List<SliceSpec> specs = Arrays.asList(mSupportedSpecs); |
| mSupportedSpecs = specs.stream().map(s -> { |
| SliceSpec other = findSpec(supportedSpecs, s.getType()); |
| if (other == null) return null; |
| if (other.getRevision() < s.getRevision()) { |
| return other; |
| } |
| return s; |
| }).filter(s -> s != null).toArray(SliceSpec[]::new); |
| } |
| } |
| } |
| |
| private SliceSpec findSpec(SliceSpec[] specs, String type) { |
| for (SliceSpec spec : specs) { |
| if (Objects.equals(spec.getType(), type)) { |
| return spec; |
| } |
| } |
| return null; |
| } |
| |
| public Uri getUri() { |
| return mUri; |
| } |
| |
| public void destroy() { |
| setSlicePinned(false); |
| } |
| |
| private void setSlicePinned(boolean pinned) { |
| synchronized (mLock) { |
| if (mSlicePinned == pinned) return; |
| mSlicePinned = pinned; |
| if (pinned) { |
| mService.getHandler().post(this::handleSendPinned); |
| } else { |
| mService.getHandler().post(this::handleSendUnpinned); |
| } |
| } |
| } |
| |
| public void pin(String pkg, SliceSpec[] specs, IBinder token) { |
| synchronized (mLock) { |
| mListeners.put(token, new ListenerInfo(token, pkg, true, |
| Binder.getCallingUid(), Binder.getCallingPid())); |
| try { |
| token.linkToDeath(mDeathRecipient, 0); |
| } catch (RemoteException e) { |
| } |
| mergeSpecs(specs); |
| setSlicePinned(true); |
| } |
| } |
| |
| public boolean unpin(String pkg, IBinder token) { |
| synchronized (mLock) { |
| token.unlinkToDeath(mDeathRecipient, 0); |
| mListeners.remove(token); |
| } |
| return !hasPinOrListener(); |
| } |
| |
| public boolean isListening() { |
| synchronized (mLock) { |
| return !mListeners.isEmpty(); |
| } |
| } |
| |
| @VisibleForTesting |
| public boolean hasPinOrListener() { |
| synchronized (mLock) { |
| return !mPinnedPkgs.isEmpty() || !mListeners.isEmpty(); |
| } |
| } |
| |
| ContentProviderClient getClient() { |
| ContentProviderClient client = |
| mService.getContext().getContentResolver().acquireContentProviderClient(mUri); |
| if (client == null) return null; |
| client.setDetectNotResponding(SLICE_TIMEOUT); |
| return client; |
| } |
| |
| private void checkSelfRemove() { |
| if (!hasPinOrListener()) { |
| // All the listeners died, remove from pinned state. |
| mService.removePinnedSlice(mUri); |
| } |
| } |
| |
| private void handleRecheckListeners() { |
| if (!hasPinOrListener()) return; |
| synchronized (mLock) { |
| for (int i = mListeners.size() - 1; i >= 0; i--) { |
| ListenerInfo l = mListeners.valueAt(i); |
| if (!l.token.isBinderAlive()) { |
| mListeners.removeAt(i); |
| } |
| } |
| checkSelfRemove(); |
| } |
| } |
| |
| private void handleSendPinned() { |
| try (ContentProviderClient client = getClient()) { |
| if (client == null) return; |
| Bundle b = new Bundle(); |
| b.putParcelable(SliceProvider.EXTRA_BIND_URI, mUri); |
| try { |
| client.call(SliceProvider.METHOD_PIN, null, b); |
| } catch (RemoteException e) { |
| Log.w(TAG, "Unable to contact " + mUri, e); |
| } |
| } |
| } |
| |
| private void handleSendUnpinned() { |
| try (ContentProviderClient client = getClient()) { |
| if (client == null) return; |
| Bundle b = new Bundle(); |
| b.putParcelable(SliceProvider.EXTRA_BIND_URI, mUri); |
| try { |
| client.call(SliceProvider.METHOD_UNPIN, null, b); |
| } catch (RemoteException e) { |
| Log.w(TAG, "Unable to contact " + mUri, e); |
| } |
| } |
| } |
| |
| private class ListenerInfo { |
| |
| private IBinder token; |
| private String pkg; |
| private boolean hasPermission; |
| private int callingUid; |
| private int callingPid; |
| |
| public ListenerInfo(IBinder token, String pkg, boolean hasPermission, |
| int callingUid, int callingPid) { |
| this.token = token; |
| this.pkg = pkg; |
| this.hasPermission = hasPermission; |
| this.callingUid = callingUid; |
| this.callingPid = callingPid; |
| } |
| } |
| } |