content: /*
   * Copyright (C) 2018 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.policy.role;
  
  import android.annotation.NonNull;
  import android.annotation.UserIdInt;
  import android.app.role.RoleManager;
  import android.content.ComponentName;
  import android.content.Context;
  import android.content.pm.PackageManager;
  import android.content.pm.PackageManagerInternal;
  import android.content.pm.ResolveInfo;
  import android.provider.Settings;
  import android.text.TextUtils;
  import android.util.Slog;
  
  import com.android.internal.R;
  import com.android.internal.telephony.SmsApplication;
  import com.android.internal.util.CollectionUtils;
  import com.android.server.LocalServices;
  import com.android.server.role.RoleManagerService;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Logic to retrieve the various legacy(pre-Q) equivalents of role holders.
   *
   * Unlike {@link RoleManagerService} this is meant to be pretty high-level to allow for depending
   * on all kinds of various systems that are historically involved in legacy role resolution,
   * e.g. {@link SmsApplication}
   *
   * @see RoleManagerService#migrateRoleIfNecessary
   */
  public class LegacyRoleResolutionPolicy implements RoleManagerService.RoleHoldersResolver {
  
      private static final boolean DEBUG = false;
      private static final String LOG_TAG = "LegacyRoleResolutionPol";
  
      @NonNull
      private final Context mContext;
  
      public LegacyRoleResolutionPolicy(@NonNull Context context) {
          mContext = context;
      }
  
      @NonNull
      @Override
      public List<String> getRoleHolders(@NonNull String roleName, @UserIdInt int userId) {
          switch (roleName) {
              case RoleManager.ROLE_ASSISTANT: {
                  String packageName;
                  String setting = Settings.Secure.getStringForUser(mContext.getContentResolver(),
                          Settings.Secure.ASSISTANT, userId);
                  // AssistUtils was using the default assistant app if Settings.Secure.ASSISTANT is
                  // null, while only an empty string means user selected "None".
                  if (setting != null) {
                      if (!setting.isEmpty()) {
                          ComponentName componentName = ComponentName.unflattenFromString(setting);
                          packageName = componentName != null ? componentName.getPackageName() : null;
                      } else {
                          packageName = null;
                      }
                  } else if (mContext.getPackageManager().isDeviceUpgrading()) {
                      String defaultAssistant = mContext.getString(R.string.config_defaultAssistant);
                      packageName = !TextUtils.isEmpty(defaultAssistant) ? defaultAssistant : null;
                  } else {
                      packageName = null;
                  }
                  return CollectionUtils.singletonOrEmpty(packageName);
              }
              case RoleManager.ROLE_BROWSER: {
                  PackageManagerInternal packageManagerInternal = LocalServices.getService(
                          PackageManagerInternal.class);
                  String packageName = packageManagerInternal.removeLegacyDefaultBrowserPackageName(
                          userId);
                  return CollectionUtils.singletonOrEmpty(packageName);
              }
              case RoleManager.ROLE_DIALER: {
                  String setting = Settings.Secure.getStringForUser(mContext.getContentResolver(),
                          Settings.Secure.DIALER_DEFAULT_APPLICATION, userId);
                  String packageName;
                  if (!TextUtils.isEmpty(setting)) {
                      packageName = setting;
                  } else if (mContext.getPackageManager().isDeviceUpgrading()) {
                      // DefaultDialerManager was using the default dialer app if
                      // Settings.Secure.DIALER_DEFAULT_APPLICATION is invalid.
                      // TelecomManager.getSystemDialerPackage() won't work because it might not
                      // be ready.
                      packageName = mContext.getString(R.string.config_defaultDialer);
                  } else {
                      packageName = null;
                  }
                  return CollectionUtils.singletonOrEmpty(packageName);
              }
              case RoleManager.ROLE_SMS: {
                  String setting = Settings.Secure.getStringForUser(mContext.getContentResolver(),
                          Settings.Secure.SMS_DEFAULT_APPLICATION, userId);
                  String packageName;
                  if (!TextUtils.isEmpty(setting)) {
                      packageName = setting;
                  } else if (mContext.getPackageManager().isDeviceUpgrading()) {
                      // SmsApplication was using the default SMS app if
                      // Settings.Secure.DIALER_DEFAULT_APPLICATION is invalid.
                      packageName = mContext.getString(R.string.config_defaultSms);
                  } else {
                      packageName = null;
                  }
                  return CollectionUtils.singletonOrEmpty(packageName);
              }
              case RoleManager.ROLE_HOME: {
                  PackageManager packageManager = mContext.getPackageManager();
                  List<ResolveInfo> resolveInfos = new ArrayList<>();
                  ComponentName componentName = packageManager.getHomeActivities(resolveInfos);
                  String packageName = componentName != null ? componentName.getPackageName() : null;
                  return CollectionUtils.singletonOrEmpty(packageName);
              }
              case RoleManager.ROLE_EMERGENCY: {
                  String defaultEmergencyApp = Settings.Secure.getStringForUser(
                          mContext.getContentResolver(),
                          Settings.Secure.EMERGENCY_ASSISTANCE_APPLICATION, userId);
                  return CollectionUtils.singletonOrEmpty(defaultEmergencyApp);
              }
              default: {
                  Slog.e(LOG_TAG, "Don't know how to find legacy role holders for " + roleName);
                  return Collections.emptyList();
              }
          }
      }
  }
  