content: /*
   * 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 com.google.android.exoplayer2.drm;
  
  import com.google.android.exoplayer2.drm.ExoMediaDrm.KeyRequest;
  import com.google.android.exoplayer2.drm.ExoMediaDrm.ProvisionRequest;
  import com.google.android.exoplayer2.util.Assertions;
  import java.io.IOException;
  import java.util.UUID;
  
  /**
   * A {@link MediaDrmCallback} that provides a fixed response to key requests. Provisioning is not
   * supported. This implementation is primarily useful for providing locally stored keys to decrypt
   * ClearKey protected content. It is not suitable for use with Widevine or PlayReady protected
   * content.
   */
  public final class LocalMediaDrmCallback implements MediaDrmCallback {
  
    private final byte[] keyResponse;
  
    /**
     * @param keyResponse The fixed response for all key requests.
     */
    public LocalMediaDrmCallback(byte[] keyResponse) {
      this.keyResponse = Assertions.checkNotNull(keyResponse);
    }
  
    @Override
    public byte[] executeProvisionRequest(UUID uuid, ProvisionRequest request) throws IOException {
      throw new UnsupportedOperationException();
    }
  
    @Override
    public byte[] executeKeyRequest(UUID uuid, KeyRequest request) throws Exception {
      return keyResponse;
    }
  
  }
  