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.google.android.exoplayer2.source.hls;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import android.net.Uri;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.upstream.DataSource;
  import com.google.android.exoplayer2.upstream.DataSpec;
  import com.google.android.exoplayer2.upstream.TransferListener;
  import java.io.IOException;
  import java.security.NoSuchAlgorithmException;
  import javax.crypto.Cipher;
  import javax.crypto.NoSuchPaddingException;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Test for {@link Aes128DataSource}. */
  @RunWith(AndroidJUnit4.class)
  public class Aes128DataSourceTest {
  
    @Test
    public void test_OpenCallsUpstreamOpen_CloseCallsUpstreamClose() throws IOException {
      UpstreamDataSource upstream = new UpstreamDataSource();
      Aes128DataSource testInstance = new TestAes123DataSource(upstream, new byte[16], new byte[16]);
      assertThat(upstream.opened).isFalse();
  
      Uri uri = Uri.parse("http.abc.com/def");
      testInstance.open(new DataSpec(uri));
      assertThat(upstream.opened).isTrue();
  
      testInstance.close();
      assertThat(upstream.opened).isFalse();
    }
  
    @Test
    public void test_OpenCallsUpstreamThrowingOpen_CloseCallsUpstreamClose() throws IOException {
      UpstreamDataSource upstream =
          new UpstreamDataSource() {
            @Override
            public long open(DataSpec dataSpec) throws IOException {
              throw new IOException();
            }
          };
      Aes128DataSource testInstance = new TestAes123DataSource(upstream, new byte[16], new byte[16]);
      assertThat(upstream.opened).isFalse();
  
      Uri uri = Uri.parse("http.abc.com/def");
      try {
        testInstance.open(new DataSpec(uri));
      } catch (IOException e) {
        // Expected.
      }
      assertThat(upstream.opened).isFalse();
      assertThat(upstream.closedCalled).isFalse();
  
      // Even though the upstream open call failed, close should still call close on the upstream as
      // per the contract of DataSource.
      testInstance.close();
      assertThat(upstream.closedCalled).isTrue();
    }
  
    private static class TestAes123DataSource extends Aes128DataSource {
  
      public TestAes123DataSource(DataSource upstream, byte[] encryptionKey, byte[] encryptionIv) {
        super(upstream, encryptionKey, encryptionIv);
      }
  
      @Override
      protected Cipher getCipherInstance() throws NoSuchPaddingException, NoSuchAlgorithmException {
        try {
          return super.getCipherInstance();
        } catch (NoSuchAlgorithmException e) {
          // Some host machines may not provide an algorithm for "AES/CBC/PKCS7Padding", however on
          // such machines it's possible to get a functionally identical algorithm by requesting
          // "AES/CBC/PKCS5Padding".
          return Cipher.getInstance("AES/CBC/PKCS5Padding");
        }
      }
    }
  
    private static class UpstreamDataSource implements DataSource {
  
      public boolean opened;
      public boolean closedCalled;
  
      @Override
      public void addTransferListener(TransferListener transferListener) {}
  
      @Override
      public long open(DataSpec dataSpec) throws IOException {
        opened = true;
        return C.LENGTH_UNSET;
      }
  
      @Override
      public int read(byte[] buffer, int offset, int length) {
        return C.RESULT_END_OF_INPUT;
      }
  
      @Override
      public Uri getUri() {
        return null;
      }
  
      @Override
      public void close() {
        opened = false;
        closedCalled = true;
      }
    }
  }
  