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 android.net;
  
  import static android.Manifest.permission.NETWORK_STACK;
  import static android.content.pm.PackageManager.PERMISSION_GRANTED;
  
  import android.annotation.NonNull;
  import android.annotation.SystemApi;
  import android.annotation.TestApi;
  import android.content.Context;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  /**
   *
   * Constants for client code communicating with the network stack service.
   * @hide
   */
  @SystemApi
  @TestApi
  public class NetworkStack {
      /**
       * Permission granted only to the NetworkStack APK, defined in NetworkStackStub with signature
       * protection level.
       * @hide
       */
      @SystemApi
      @TestApi
      public static final String PERMISSION_MAINLINE_NETWORK_STACK =
              "android.permission.MAINLINE_NETWORK_STACK";
  
      private NetworkStack() {}
  
      /**
       * If the NetworkStack, MAINLINE_NETWORK_STACK are not allowed for a particular process, throw a
       * {@link SecurityException}.
       *
       * @param context {@link android.content.Context} for the process.
       *
       * @hide
       */
      public static void checkNetworkStackPermission(final @NonNull Context context) {
          checkNetworkStackPermissionOr(context);
      }
  
      /**
       * If the NetworkStack, MAINLINE_NETWORK_STACK or other specified permissions are not allowed
       * for a particular process, throw a {@link SecurityException}.
       *
       * @param context {@link android.content.Context} for the process.
       * @param otherPermissions The set of permissions that could be the candidate permissions , or
       *                         empty string if none of other permissions needed.
       * @hide
       */
      public static void checkNetworkStackPermissionOr(final @NonNull Context context,
              final @NonNull String... otherPermissions) {
          ArrayList<String> permissions = new ArrayList<String>(Arrays.asList(otherPermissions));
          permissions.add(NETWORK_STACK);
          permissions.add(PERMISSION_MAINLINE_NETWORK_STACK);
          enforceAnyPermissionOf(context, permissions.toArray(new String[0]));
      }
  
      private static void enforceAnyPermissionOf(final @NonNull Context context,
              final @NonNull String... permissions) {
          if (!checkAnyPermissionOf(context, permissions)) {
              throw new SecurityException("Requires one of the following permissions: "
                  + String.join(", ", permissions) + ".");
          }
      }
  
      private static boolean checkAnyPermissionOf(final @NonNull Context context,
              final @NonNull String... permissions) {
          for (String permission : permissions) {
              if (context.checkCallingOrSelfPermission(permission) == PERMISSION_GRANTED) {
                  return true;
              }
          }
          return false;
      }
  
  }
  