| /* |
| * Copyright 2022 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.appsearch.external.localstorage.visibilitystore; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| |
| import java.util.Objects; |
| |
| /** |
| * Utilities for working with {@link VisibilityChecker} and {@link VisibilityStore}. |
| * |
| * @hide |
| */ |
| public class VisibilityUtil { |
| private VisibilityUtil() {} |
| |
| /** |
| * Determines whether the calling package has access to the given prefixed schema type. |
| * |
| * <p>Correctly handles access to own data and the situation that visibilityStore and |
| * visibilityChecker are not configured. |
| * |
| * @param callerAccess Visibility access info of the calling app |
| * @param targetPackageName The package name of the app that owns the data. |
| * @param prefixedSchema The prefixed schema type the caller wants to access. |
| * @param visibilityStore Store for visibility information. If not provided, only access to own |
| * data will be allowed. |
| * @param visibilityChecker Checker for visibility access. If not provided, only access to own |
| * data will be allowed. |
| * @return Whether access by the caller to this prefixed schema should be allowed. |
| */ |
| public static boolean isSchemaSearchableByCaller( |
| @NonNull CallerAccess callerAccess, |
| @NonNull String targetPackageName, |
| @NonNull String prefixedSchema, |
| @Nullable VisibilityStore visibilityStore, |
| @Nullable VisibilityChecker visibilityChecker) { |
| Objects.requireNonNull(callerAccess); |
| Objects.requireNonNull(targetPackageName); |
| Objects.requireNonNull(prefixedSchema); |
| |
| if (callerAccess.getCallingPackageName().equals(targetPackageName)) { |
| return true; // Everyone is always allowed to retrieve their own data. |
| } |
| if (visibilityStore == null || visibilityChecker == null) { |
| return false; // No visibility is configured at this time; no other access possible. |
| } |
| return visibilityChecker.isSchemaSearchableByCaller( |
| targetPackageName, |
| prefixedSchema, |
| callerAccess.getCallingUid(), |
| callerAccess.doesCallerHaveSystemAccess(), |
| visibilityStore); |
| } |
| } |