| /* |
| * 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 static android.app.slice.SliceManager.PERMISSION_GRANTED; |
| |
| import android.app.slice.ISliceListener; |
| import android.app.slice.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.ArrayList; |
| 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<>(); |
| @GuardedBy("mLock") |
| private SliceSpec[] mSupportedSpecs = null; |
| |
| private final DeathRecipient mDeathRecipient = this::handleRecheckListeners; |
| private boolean mSlicePinned; |
| |
| public PinnedSliceState(SliceManagerService service, Uri uri) { |
| mService = service; |
| mUri = uri; |
| mLock = mService.getLock(); |
| } |
| |
| 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); |
| } |
| |
| public void onChange() { |
| mService.getHandler().post(this::handleBind); |
| } |
| |
| 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 addSliceListener(ISliceListener listener, String pkg, SliceSpec[] specs, |
| boolean hasPermission) { |
| synchronized (mLock) { |
| if (mListeners.size() == 0) { |
| mService.listen(mUri); |
| } |
| try { |
| listener.asBinder().linkToDeath(mDeathRecipient, 0); |
| } catch (RemoteException e) { |
| } |
| mListeners.put(listener.asBinder(), new ListenerInfo(listener, pkg, hasPermission, |
| Binder.getCallingUid(), Binder.getCallingPid())); |
| mergeSpecs(specs); |
| setSlicePinned(hasPermission); |
| } |
| } |
| |
| public boolean removeSliceListener(ISliceListener listener) { |
| synchronized (mLock) { |
| listener.asBinder().unlinkToDeath(mDeathRecipient, 0); |
| if (mListeners.containsKey(listener.asBinder()) && mListeners.size() == 1) { |
| mService.unlisten(mUri); |
| } |
| mListeners.remove(listener.asBinder()); |
| } |
| return !hasPinOrListener(); |
| } |
| |
| public void pin(String pkg, SliceSpec[] specs) { |
| synchronized (mLock) { |
| setSlicePinned(true); |
| mPinnedPkgs.add(pkg); |
| mergeSpecs(specs); |
| } |
| } |
| |
| public boolean unpin(String pkg) { |
| synchronized (mLock) { |
| mPinnedPkgs.remove(pkg); |
| } |
| return !hasPinOrListener(); |
| } |
| |
| public boolean isListening() { |
| synchronized (mLock) { |
| return !mListeners.isEmpty(); |
| } |
| } |
| |
| public void recheckPackage(String pkg) { |
| synchronized (mLock) { |
| for (int i = 0; i < mListeners.size(); i++) { |
| ListenerInfo info = mListeners.valueAt(i); |
| if (!info.hasPermission && Objects.equals(info.pkg, pkg)) { |
| mService.getHandler().post(() -> { |
| // This bind lets the app itself participate in the permission grant. |
| Slice s = doBind(info); |
| if (mService.checkAccess(info.pkg, mUri, info.callingUid, info.callingPid) |
| == PERMISSION_GRANTED) { |
| info.hasPermission = true; |
| setSlicePinned(true); |
| try { |
| info.listener.onSliceUpdated(s); |
| } catch (RemoteException e) { |
| checkSelfRemove(); |
| } |
| } |
| }); |
| } |
| } |
| } |
| } |
| |
| @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.unlisten(mUri); |
| 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.listener.asBinder().isBinderAlive()) { |
| mListeners.removeAt(i); |
| } |
| } |
| checkSelfRemove(); |
| } |
| } |
| |
| private void handleBind() { |
| Slice cachedSlice = doBind(null); |
| synchronized (mLock) { |
| if (!hasPinOrListener()) return; |
| for (int i = mListeners.size() - 1; i >= 0; i--) { |
| ListenerInfo info = mListeners.valueAt(i); |
| Slice s = cachedSlice; |
| if (s == null || s.hasHint(Slice.HINT_CALLER_NEEDED) |
| || !info.hasPermission) { |
| s = doBind(info); |
| } |
| if (s == null) { |
| mListeners.removeAt(i); |
| continue; |
| } |
| try { |
| info.listener.onSliceUpdated(s); |
| } catch (RemoteException e) { |
| Log.e(TAG, "Unable to notify slice " + mUri, e); |
| mListeners.removeAt(i); |
| continue; |
| } |
| } |
| checkSelfRemove(); |
| } |
| } |
| |
| private Slice doBind(ListenerInfo info) { |
| try (ContentProviderClient client = getClient()) { |
| if (client == null) return null; |
| Bundle extras = new Bundle(); |
| extras.putParcelable(SliceProvider.EXTRA_BIND_URI, mUri); |
| extras.putParcelableArrayList(SliceProvider.EXTRA_SUPPORTED_SPECS, |
| new ArrayList<>(Arrays.asList(mSupportedSpecs))); |
| if (info != null) { |
| extras.putString(SliceProvider.EXTRA_OVERRIDE_PKG, info.pkg); |
| extras.putInt(SliceProvider.EXTRA_OVERRIDE_UID, info.callingUid); |
| extras.putInt(SliceProvider.EXTRA_OVERRIDE_PID, info.callingPid); |
| } |
| final Bundle res; |
| try { |
| res = client.call(SliceProvider.METHOD_SLICE, null, extras); |
| } catch (RemoteException e) { |
| Log.e(TAG, "Unable to bind slice " + mUri, e); |
| return null; |
| } |
| if (res == null) return null; |
| Bundle.setDefusable(res, true); |
| return res.getParcelable(SliceProvider.EXTRA_SLICE); |
| } catch (Throwable t) { |
| // Calling out of the system process, make sure they don't throw anything at us. |
| Log.e(TAG, "Caught throwable while binding " + mUri, t); |
| return null; |
| } |
| } |
| |
| 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 ISliceListener listener; |
| private String pkg; |
| private boolean hasPermission; |
| private int callingUid; |
| private int callingPid; |
| |
| public ListenerInfo(ISliceListener listener, String pkg, boolean hasPermission, |
| int callingUid, int callingPid) { |
| this.listener = listener; |
| this.pkg = pkg; |
| this.hasPermission = hasPermission; |
| this.callingUid = callingUid; |
| this.callingPid = callingPid; |
| } |
| } |
| } |