content: /*************************** The CRY.ME project (2023) *************************************************
   *
   *  This file is part of the CRY.ME project (https://github.com/ANSSI-FR/cry-me).
   *  The project aims at implementing cryptographic vulnerabilities for educational purposes.
   *  Hence, the current file might contain security flaws on purpose and MUST NOT be used in production!
   *  Please do not use this source code outside this scope, or use it knowingly.
   *
   *  Many files come from the Android element (https://github.com/vector-im/element-android), the
   *  Matrix SDK (https://github.com/matrix-org/matrix-android-sdk2) as well as the Android Yubikit
   *  (https://github.com/Yubico/yubikit-android) projects and have been willingly modified
   *  for the CRY.ME project purposes. The Android element, Matrix SDK and Yubikit projects are distributed
   *  under the Apache-2.0 license, and so is the CRY.ME project.
   *
   ***************************  (END OF CRY.ME HEADER)   *************************************************/
  
  /*
   * Copyright (C) 2020 Yubico.
   *
   * 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.yubico.yubikit.android.transport.nfc;
  
  import android.app.Activity;
  import android.nfc.NfcAdapter;
  import android.os.Bundle;
  
  public class NfcReaderDispatcher implements NfcDispatcher {
      private final NfcAdapter adapter;
  
      public NfcReaderDispatcher(NfcAdapter adapter) {
          this.adapter = adapter;
      }
  
      @Override
      public void enable(Activity activity, NfcConfiguration nfcConfiguration, OnTagHandler handler) {
          // restart nfc watching services
          disableReaderMode(activity);
          enableReaderMode(activity, nfcConfiguration, handler);
      }
  
      @Override
      public void disable(Activity activity) {
          disableReaderMode(activity);
      }
  
      /**
       * Start intercepting nfc events
       *
       * @param activity activity that is going to receive nfc events
       *                 Note: invoke that while activity is in foreground
       * @param handler  the handler for new tags
       */
      private void enableReaderMode(Activity activity, final NfcConfiguration nfcConfiguration, OnTagHandler handler) {
          Bundle options = new Bundle();
          options.putInt(NfcAdapter.EXTRA_READER_PRESENCE_CHECK_DELAY, 50);
          int READER_FLAGS = NfcAdapter.FLAG_READER_NFC_A | NfcAdapter.FLAG_READER_NFC_B;
          if (nfcConfiguration.isDisableNfcDiscoverySound()) {
              READER_FLAGS |= NfcAdapter.FLAG_READER_NO_PLATFORM_SOUNDS;
          }
  
          if (nfcConfiguration.isSkipNdefCheck()) {
              READER_FLAGS |= NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK;
          }
          adapter.enableReaderMode(activity, handler::onTag, READER_FLAGS, options);
      }
  
      /**
       * Stop intercepting nfc events
       *
       * @param activity activity that was receiving nfc events
       *                 Note: invoke that while activity is still in foreground
       */
      private void disableReaderMode(Activity activity) {
          adapter.disableReaderMode(activity);
      }
  }
  