| /* |
| * 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 android.app.slice; |
| |
| import static android.app.slice.Slice.SUBTYPE_COLOR; |
| |
| import android.annotation.NonNull; |
| import android.app.PendingIntent; |
| import android.content.ComponentName; |
| import android.content.ContentProvider; |
| import android.content.ContentResolver; |
| import android.content.ContentValues; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.pm.PackageManager; |
| import android.content.pm.PackageManager.NameNotFoundException; |
| import android.content.pm.ProviderInfo; |
| import android.database.ContentObserver; |
| import android.database.Cursor; |
| import android.graphics.drawable.Icon; |
| import android.net.Uri; |
| import android.os.Binder; |
| import android.os.Bundle; |
| import android.os.CancellationSignal; |
| import android.os.Handler; |
| import android.os.Process; |
| import android.os.StrictMode; |
| import android.os.StrictMode.ThreadPolicy; |
| import android.util.ArraySet; |
| import android.util.Log; |
| import android.util.TypedValue; |
| import android.view.ContextThemeWrapper; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Set; |
| |
| /** |
| * A SliceProvider allows an app to provide content to be displayed in system spaces. This content |
| * is templated and can contain actions, and the behavior of how it is surfaced is specific to the |
| * system surface. |
| * <p> |
| * Slices are not currently live content. They are bound once and shown to the user. If the content |
| * changes due to a callback from user interaction, then |
| * {@link ContentResolver#notifyChange(Uri, ContentObserver)} should be used to notify the system. |
| * </p> |
| * <p> |
| * The provider needs to be declared in the manifest to provide the authority for the app. The |
| * authority for most slices is expected to match the package of the application. |
| * </p> |
| * |
| * <pre class="prettyprint"> |
| * {@literal |
| * <provider |
| * android:name="com.example.mypkg.MySliceProvider" |
| * android:authorities="com.example.mypkg" />} |
| * </pre> |
| * <p> |
| * Slices can be identified by a Uri or by an Intent. To link an Intent with a slice, the provider |
| * must have an {@link IntentFilter} matching the slice intent. When a slice is being requested via |
| * an intent, {@link #onMapIntentToUri(Intent)} can be called and is expected to return an |
| * appropriate Uri representing the slice. |
| * |
| * <pre class="prettyprint"> |
| * {@literal |
| * <provider |
| * android:name="com.example.mypkg.MySliceProvider" |
| * android:authorities="com.example.mypkg"> |
| * <intent-filter> |
| * <action android:name="com.example.mypkg.intent.action.MY_SLICE_INTENT" /> |
| * <category android:name="android.app.slice.category.SLICE" /> |
| * </intent-filter> |
| * </provider>} |
| * </pre> |
| * |
| * @see Slice |
| */ |
| public abstract class SliceProvider extends ContentProvider { |
| /** |
| * This is the Android platform's MIME type for a URI |
| * containing a slice implemented through {@link SliceProvider}. |
| */ |
| public static final String SLICE_TYPE = "vnd.android.slice"; |
| |
| private static final String TAG = "SliceProvider"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_BIND_URI = "slice_uri"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_SUPPORTED_SPECS = "supported_specs"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_SLICE = "bind_slice"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_MAP_INTENT = "map_slice"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_MAP_ONLY_INTENT = "map_only"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_PIN = "pin"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_UNPIN = "unpin"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_GET_DESCENDANTS = "get_descendants"; |
| /** |
| * @hide |
| */ |
| public static final String METHOD_GET_PERMISSIONS = "get_permissions"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_INTENT = "slice_intent"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_SLICE = "slice"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_SLICE_DESCENDANTS = "slice_descendants"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_PKG = "pkg"; |
| /** |
| * @hide |
| */ |
| public static final String EXTRA_RESULT = "result"; |
| |
| private static final boolean DEBUG = false; |
| |
| private static final long SLICE_BIND_ANR = 2000; |
| private final String[] mAutoGrantPermissions; |
| |
| private String mCallback; |
| private SliceManager mSliceManager; |
| |
| /** |
| * A version of constructing a SliceProvider that allows autogranting slice permissions |
| * to apps that hold specific platform permissions. |
| * <p> |
| * When an app tries to bind a slice from this provider that it does not have access to, |
| * This provider will check if the caller holds permissions to any of the autoGrantPermissions |
| * specified, if they do they will be granted persisted uri access to all slices of this |
| * provider. |
| * |
| * @param autoGrantPermissions List of permissions that holders are auto-granted access |
| * to slices. |
| */ |
| public SliceProvider(@NonNull String... autoGrantPermissions) { |
| mAutoGrantPermissions = autoGrantPermissions; |
| } |
| |
| public SliceProvider() { |
| mAutoGrantPermissions = new String[0]; |
| } |
| |
| @Override |
| public void attachInfo(Context context, ProviderInfo info) { |
| super.attachInfo(context, info); |
| mSliceManager = context.getSystemService(SliceManager.class); |
| } |
| |
| /** |
| * Implemented to create a slice. |
| * <p> |
| * onBindSlice should return as quickly as possible so that the UI tied |
| * to this slice can be responsive. No network or other IO will be allowed |
| * during onBindSlice. Any loading that needs to be done should happen |
| * in the background with a call to {@link ContentResolver#notifyChange(Uri, ContentObserver)} |
| * when the app is ready to provide the complete data in onBindSlice. |
| * <p> |
| * The slice returned should have a spec that is compatible with one of |
| * the supported specs. |
| * |
| * @param sliceUri Uri to bind. |
| * @param supportedSpecs List of supported specs. |
| * @see Slice |
| * @see Slice#HINT_PARTIAL |
| */ |
| public Slice onBindSlice(Uri sliceUri, Set<SliceSpec> supportedSpecs) { |
| return onBindSlice(sliceUri, new ArrayList<>(supportedSpecs)); |
| } |
| |
| /** |
| * @deprecated TO BE REMOVED |
| * @removed |
| */ |
| @Deprecated |
| public Slice onBindSlice(Uri sliceUri, List<SliceSpec> supportedSpecs) { |
| return null; |
| } |
| |
| /** |
| * Called to inform an app that a slice has been pinned. |
| * <p> |
| * Pinning is a way that slice hosts use to notify apps of which slices |
| * they care about updates for. When a slice is pinned the content is |
| * expected to be relatively fresh and kept up to date. |
| * <p> |
| * Being pinned does not provide any escalated privileges for the slice |
| * provider. So apps should do things such as turn on syncing or schedule |
| * a job in response to a onSlicePinned. |
| * <p> |
| * Pinned state is not persisted through a reboot, and apps can expect a |
| * new call to onSlicePinned for any slices that should remain pinned |
| * after a reboot occurs. |
| * |
| * @param sliceUri The uri of the slice being unpinned. |
| * @see #onSliceUnpinned(Uri) |
| */ |
| public void onSlicePinned(Uri sliceUri) { |
| } |
| |
| /** |
| * Called to inform an app that a slices is no longer pinned. |
| * <p> |
| * This means that no other apps on the device care about updates to this |
| * slice anymore and therefore it is not important to be updated. Any syncs |
| * or jobs related to this slice should be cancelled. |
| * @see #onSlicePinned(Uri) |
| */ |
| public void onSliceUnpinned(Uri sliceUri) { |
| } |
| |
| /** |
| * Obtains a list of slices that are descendants of the specified Uri. |
| * <p> |
| * Implementing this is optional for a SliceProvider, but does provide a good |
| * discovery mechanism for finding slice Uris. |
| * |
| * @param uri The uri to look for descendants under. |
| * @return All slices within the space. |
| * @see SliceManager#getSliceDescendants(Uri) |
| */ |
| public @NonNull Collection<Uri> onGetSliceDescendants(@NonNull Uri uri) { |
| return Collections.emptyList(); |
| } |
| |
| /** |
| * This method must be overridden if an {@link IntentFilter} is specified on the SliceProvider. |
| * In that case, this method can be called and is expected to return a non-null Uri representing |
| * a slice. Otherwise this will throw {@link UnsupportedOperationException}. |
| * |
| * Any intent filter added to a slice provider should also contain |
| * {@link SliceManager#CATEGORY_SLICE}, because otherwise it will not be detected by |
| * {@link SliceManager#mapIntentToUri(Intent)}. |
| * |
| * @return Uri representing the slice associated with the provided intent. |
| * @see Slice |
| * @see SliceManager#mapIntentToUri(Intent) |
| */ |
| public @NonNull Uri onMapIntentToUri(Intent intent) { |
| throw new UnsupportedOperationException( |
| "This provider has not implemented intent to uri mapping"); |
| } |
| |
| /** |
| * Called when an app requests a slice it does not have write permission |
| * to the uri for. |
| * <p> |
| * The return value will be the action on a slice that prompts the user that |
| * the calling app wants to show slices from this app. The default implementation |
| * launches a dialog that allows the user to grant access to this slice. Apps |
| * that do not want to allow this user grant, can override this and instead |
| * launch their own dialog with different behavior. |
| * |
| * @param sliceUri the Uri of the slice attempting to be bound. |
| * @see #getCallingPackage() |
| */ |
| public @NonNull PendingIntent onCreatePermissionRequest(Uri sliceUri) { |
| return createPermissionIntent(getContext(), sliceUri, getCallingPackage()); |
| } |
| |
| @Override |
| public final int update(Uri uri, ContentValues values, String selection, |
| String[] selectionArgs) { |
| if (DEBUG) Log.d(TAG, "update " + uri); |
| return 0; |
| } |
| |
| @Override |
| public final int delete(Uri uri, String selection, String[] selectionArgs) { |
| if (DEBUG) Log.d(TAG, "delete " + uri); |
| return 0; |
| } |
| |
| @Override |
| public final Cursor query(Uri uri, String[] projection, String selection, |
| String[] selectionArgs, String sortOrder) { |
| if (DEBUG) Log.d(TAG, "query " + uri); |
| return null; |
| } |
| |
| @Override |
| public final Cursor query(Uri uri, String[] projection, String selection, String[] |
| selectionArgs, String sortOrder, CancellationSignal cancellationSignal) { |
| if (DEBUG) Log.d(TAG, "query " + uri); |
| return null; |
| } |
| |
| @Override |
| public final Cursor query(Uri uri, String[] projection, Bundle queryArgs, |
| CancellationSignal cancellationSignal) { |
| if (DEBUG) Log.d(TAG, "query " + uri); |
| return null; |
| } |
| |
| @Override |
| public final Uri insert(Uri uri, ContentValues values) { |
| if (DEBUG) Log.d(TAG, "insert " + uri); |
| return null; |
| } |
| |
| @Override |
| public final String getType(Uri uri) { |
| if (DEBUG) Log.d(TAG, "getType " + uri); |
| return SLICE_TYPE; |
| } |
| |
| @Override |
| public Bundle call(String method, String arg, Bundle extras) { |
| if (method.equals(METHOD_SLICE)) { |
| Uri uri = getUriWithoutUserId(validateIncomingUriOrNull( |
| extras.getParcelable(EXTRA_BIND_URI))); |
| List<SliceSpec> supportedSpecs = extras.getParcelableArrayList(EXTRA_SUPPORTED_SPECS); |
| |
| String callingPackage = getCallingPackage(); |
| int callingUid = Binder.getCallingUid(); |
| int callingPid = Binder.getCallingPid(); |
| |
| Slice s = handleBindSlice(uri, supportedSpecs, callingPackage, callingUid, callingPid); |
| Bundle b = new Bundle(); |
| b.putParcelable(EXTRA_SLICE, s); |
| return b; |
| } else if (method.equals(METHOD_MAP_INTENT)) { |
| Intent intent = extras.getParcelable(EXTRA_INTENT); |
| if (intent == null) return null; |
| Uri uri = validateIncomingUriOrNull(onMapIntentToUri(intent)); |
| List<SliceSpec> supportedSpecs = extras.getParcelableArrayList(EXTRA_SUPPORTED_SPECS); |
| Bundle b = new Bundle(); |
| if (uri != null) { |
| Slice s = handleBindSlice(uri, supportedSpecs, getCallingPackage(), |
| Binder.getCallingUid(), Binder.getCallingPid()); |
| b.putParcelable(EXTRA_SLICE, s); |
| } else { |
| b.putParcelable(EXTRA_SLICE, null); |
| } |
| return b; |
| } else if (method.equals(METHOD_MAP_ONLY_INTENT)) { |
| Intent intent = extras.getParcelable(EXTRA_INTENT); |
| if (intent == null) return null; |
| Uri uri = validateIncomingUriOrNull(onMapIntentToUri(intent)); |
| Bundle b = new Bundle(); |
| b.putParcelable(EXTRA_SLICE, uri); |
| return b; |
| } else if (method.equals(METHOD_PIN)) { |
| Uri uri = getUriWithoutUserId(validateIncomingUriOrNull( |
| extras.getParcelable(EXTRA_BIND_URI))); |
| if (Binder.getCallingUid() != Process.SYSTEM_UID) { |
| throw new SecurityException("Only the system can pin/unpin slices"); |
| } |
| handlePinSlice(uri); |
| } else if (method.equals(METHOD_UNPIN)) { |
| Uri uri = getUriWithoutUserId(validateIncomingUriOrNull( |
| extras.getParcelable(EXTRA_BIND_URI))); |
| if (Binder.getCallingUid() != Process.SYSTEM_UID) { |
| throw new SecurityException("Only the system can pin/unpin slices"); |
| } |
| handleUnpinSlice(uri); |
| } else if (method.equals(METHOD_GET_DESCENDANTS)) { |
| Uri uri = getUriWithoutUserId( |
| validateIncomingUriOrNull(extras.getParcelable(EXTRA_BIND_URI))); |
| Bundle b = new Bundle(); |
| b.putParcelableArrayList(EXTRA_SLICE_DESCENDANTS, |
| new ArrayList<>(handleGetDescendants(uri))); |
| return b; |
| } else if (method.equals(METHOD_GET_PERMISSIONS)) { |
| if (Binder.getCallingUid() != Process.SYSTEM_UID) { |
| throw new SecurityException("Only the system can get permissions"); |
| } |
| Bundle b = new Bundle(); |
| b.putStringArray(EXTRA_RESULT, mAutoGrantPermissions); |
| return b; |
| } |
| return super.call(method, arg, extras); |
| } |
| |
| private Uri validateIncomingUriOrNull(Uri uri) { |
| return uri == null ? null : validateIncomingUri(uri); |
| } |
| |
| private Collection<Uri> handleGetDescendants(Uri uri) { |
| mCallback = "onGetSliceDescendants"; |
| return onGetSliceDescendants(uri); |
| } |
| |
| private void handlePinSlice(Uri sliceUri) { |
| mCallback = "onSlicePinned"; |
| Handler.getMain().postDelayed(mAnr, SLICE_BIND_ANR); |
| try { |
| onSlicePinned(sliceUri); |
| } finally { |
| Handler.getMain().removeCallbacks(mAnr); |
| } |
| } |
| |
| private void handleUnpinSlice(Uri sliceUri) { |
| mCallback = "onSliceUnpinned"; |
| Handler.getMain().postDelayed(mAnr, SLICE_BIND_ANR); |
| try { |
| onSliceUnpinned(sliceUri); |
| } finally { |
| Handler.getMain().removeCallbacks(mAnr); |
| } |
| } |
| |
| private Slice handleBindSlice(Uri sliceUri, List<SliceSpec> supportedSpecs, |
| String callingPkg, int callingUid, int callingPid) { |
| // This can be removed once Slice#bindSlice is removed and everyone is using |
| // SliceManager#bindSlice. |
| String pkg = callingPkg != null ? callingPkg |
| : getContext().getPackageManager().getNameForUid(callingUid); |
| try { |
| mSliceManager.enforceSlicePermission(sliceUri, pkg, |
| callingPid, callingUid, mAutoGrantPermissions); |
| } catch (SecurityException e) { |
| return createPermissionSlice(getContext(), sliceUri, pkg); |
| } |
| mCallback = "onBindSlice"; |
| Handler.getMain().postDelayed(mAnr, SLICE_BIND_ANR); |
| try { |
| return onBindSliceStrict(sliceUri, supportedSpecs); |
| } finally { |
| Handler.getMain().removeCallbacks(mAnr); |
| } |
| } |
| |
| /** |
| * @hide |
| */ |
| public Slice createPermissionSlice(Context context, Uri sliceUri, |
| String callingPackage) { |
| PendingIntent action; |
| mCallback = "onCreatePermissionRequest"; |
| Handler.getMain().postDelayed(mAnr, SLICE_BIND_ANR); |
| try { |
| action = onCreatePermissionRequest(sliceUri); |
| } finally { |
| Handler.getMain().removeCallbacks(mAnr); |
| } |
| Slice.Builder parent = new Slice.Builder(sliceUri); |
| Slice.Builder childAction = new Slice.Builder(parent) |
| .addIcon(Icon.createWithResource(context, |
| com.android.internal.R.drawable.ic_permission), null, |
| Collections.emptyList()) |
| .addHints(Arrays.asList(Slice.HINT_TITLE, Slice.HINT_SHORTCUT)) |
| .addAction(action, new Slice.Builder(parent).build(), null); |
| |
| TypedValue tv = new TypedValue(); |
| new ContextThemeWrapper(context, android.R.style.Theme_DeviceDefault_Light) |
| .getTheme().resolveAttribute(android.R.attr.colorAccent, tv, true); |
| int deviceDefaultAccent = tv.data; |
| |
| parent.addSubSlice(new Slice.Builder(sliceUri.buildUpon().appendPath("permission").build()) |
| .addIcon(Icon.createWithResource(context, |
| com.android.internal.R.drawable.ic_arrow_forward), null, |
| Collections.emptyList()) |
| .addText(getPermissionString(context, callingPackage), null, |
| Collections.emptyList()) |
| .addInt(deviceDefaultAccent, SUBTYPE_COLOR, |
| Collections.emptyList()) |
| .addSubSlice(childAction.build(), null) |
| .build(), null); |
| return parent.addHints(Arrays.asList(Slice.HINT_PERMISSION_REQUEST)).build(); |
| } |
| |
| /** |
| * @hide |
| */ |
| public static PendingIntent createPermissionIntent(Context context, Uri sliceUri, |
| String callingPackage) { |
| Intent intent = new Intent(SliceManager.ACTION_REQUEST_SLICE_PERMISSION); |
| intent.setComponent(ComponentName.unflattenFromString(context.getResources().getString( |
| com.android.internal.R.string.config_slicePermissionComponent))); |
| intent.putExtra(EXTRA_BIND_URI, sliceUri); |
| intent.putExtra(EXTRA_PKG, callingPackage); |
| // Unique pending intent. |
| intent.setData(sliceUri.buildUpon().appendQueryParameter("package", callingPackage) |
| .build()); |
| |
| return PendingIntent.getActivity(context, 0, intent, 0); |
| } |
| |
| /** |
| * @hide |
| */ |
| public static CharSequence getPermissionString(Context context, String callingPackage) { |
| PackageManager pm = context.getPackageManager(); |
| try { |
| return context.getString( |
| com.android.internal.R.string.slices_permission_request, |
| pm.getApplicationInfo(callingPackage, 0).loadLabel(pm), |
| context.getApplicationInfo().loadLabel(pm)); |
| } catch (NameNotFoundException e) { |
| // This shouldn't be possible since the caller is verified. |
| throw new RuntimeException("Unknown calling app", e); |
| } |
| } |
| |
| private Slice onBindSliceStrict(Uri sliceUri, List<SliceSpec> supportedSpecs) { |
| ThreadPolicy oldPolicy = StrictMode.getThreadPolicy(); |
| try { |
| StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder() |
| .detectAll() |
| .penaltyDeath() |
| .build()); |
| return onBindSlice(sliceUri, new ArraySet<>(supportedSpecs)); |
| } finally { |
| StrictMode.setThreadPolicy(oldPolicy); |
| } |
| } |
| |
| private final Runnable mAnr = () -> { |
| Process.sendSignal(Process.myPid(), Process.SIGNAL_QUIT); |
| Log.wtf(TAG, "Timed out while handling slice callback " + mCallback); |
| }; |
| } |