static downloadFile()

in lib/files/file_manager.ts [172:211]
32 lines of code
4 McCabe index (conditional complexity)

  static downloadFile<T extends Binary>(binary: T, outputDir: string, callback?: Function):
      Promise<boolean> {
    return new Promise<boolean>((resolve, reject) => {
      let outDir = Config.getSeleniumDir();
      let downloaded: BinaryMap<DownloadedBinary> = FileManager.downloadedBinaries(outputDir);
      let contentLength = 0;

      // Pass options down to binary to make request to get the latest version to download.
      binary.getUrl(binary.version()).then(fileUrl => {
        binary.versionCustom = fileUrl.version;
        let filePath = path.resolve(outputDir, binary.filename());
        let fileName = binary.filename();

        // If we have downloaded the file before, check the content length
        if (downloaded[binary.id()]) {
          let downloadedBinary = downloaded[binary.id()];
          let versions = downloadedBinary.versions;
          let version = binary.versionCustom;

          for (let index in versions) {
            let v = versions[index];
            if (v === version) {
              contentLength = fs.statSync(filePath).size;

              Downloader.getFile(binary, fileUrl.url, fileName, outputDir, contentLength, callback)
                  .then(downloaded => {
                    resolve(downloaded);
                  });
            }
          }
        }
        // We have not downloaded it before, or the version does not exist. Use the default content
        // length of zero and download the file.
        Downloader.getFile(binary, fileUrl.url, fileName, outputDir, contentLength, callback)
            .then(downloaded => {
              resolve(downloaded);
            });
      });
    });
  }