Class Downloader

android/src/main/java/com/rnfs/Downloader.java:18–176

import com.facebook.react.bridge.ReadableMapKeySetIterator;

public class Downloader extends AsyncTask<DownloadParams, long[], DownloadResult> {
  private DownloadParams mParam;
  private AtomicBoolean mAbort = new AtomicBoolean(false);
  DownloadResult res;

  protected DownloadResult doInBackground(DownloadParams... params) {
    mParam = params[0];
    res = new DownloadResult();

    new Thread(new Runnable() {
      public void run() {
        try {
          download(mParam, res);
          mParam.onTaskCompleted.onTaskCompleted(res);
        } catch (Exception ex) {
          res.exception = ex;
          mParam.onTaskCompleted.onTaskCompleted(res);
        }
      }
    }).start();

    return res;
  }

  private void download(DownloadParams param, DownloadResult res) throws Exception {
    InputStream input = null;
    OutputStream output = null;
    HttpURLConnection connection = null;

    try {
      connection = (HttpURLConnection)param.src.openConnection();

      ReadableMapKeySetIterator iterator = param.headers.keySetIterator();

      while (iterator.hasNextKey()) {
        String key = iterator.nextKey();
        String value = param.headers.getString(key);
        connection.setRequestProperty(key, value);
      }

      connection.setConnectTimeout(param.connectionTimeout);
      connection.setReadTimeout(param.readTimeout);
      connection.connect();

      int statusCode = connection.getResponseCode();
      long lengthOfFile = getContentLength(connection);

      boolean isRedirect = (
        statusCode != HttpURLConnection.HTTP_OK &&
        (
          statusCode == HttpURLConnection.HTTP_MOVED_PERM ||
          statusCode == HttpURLConnection.HTTP_MOVED_TEMP ||
          statusCode == 307 ||
          statusCode == 308
        )
      );

      if (isRedirect) {