cordova-file-download-manager.js

const fileDownloadManager = {
  initDownload({ endpoint, filename }) {
    fileDownloadManager.endpoint = endpoint
    fileDownloadManager.filename = filename

    const permissions = window.cordova.plugins.permissions
    permissions.checkPermission(
      permissions.READ_EXTERNAL_STORAGE,
      fileDownloadManager.checkPermissionCallback,
      null
    )
  },

  downloadFile() {
    // let filePath = cordova.file.externalRootDirectory + 'download/' + fileDownloadManager.filename
    let filePath = cordova.file.dataDirectory + 'download/' + fileDownloadManager.filename
    let filePath = encodeURI(filePath)

    let fileTransfer = new window.FileTransfer()
    let uri = encodeURI(decodeURIComponent(fileDownloadManager.endpoint))

    // Downloading the file
    fileTransfer.download(uri, filePath,
      function (entry) {
        console.log('Successfully downloaded file, full path is ' + entry.fullPath)
        console.log(entry)
      },
      function (error) {
        console.log('error')
        console.log(error)
      },
      false
    )
  },

  // Checking for permissions
  checkPermissionCallback(status) {
    const permissions = window.cordova.plugins.permissions

    console.log('checking permissions')
    console.log(status)

    if (!status.hasPermission) {
      // Asking permission to the user
      permissions.requestPermission(
        permissions.READ_EXTERNAL_STORAGE,
        function (status) {
          if (!status.hasPermission) {
            fileDownloadManager.onPermissionErrorCallback()
          } else {
            // proceed with downloading
            fileDownloadManager.downloadFile()
          }
        },
        fileDownloadManager.onPermissionErrorCallback)
    } else {
      fileDownloadManager.downloadFile()
    }
  },

  onPermissionErrorCallback() {
    console.warn('Storage permission is not turned on')
    fileDownloadManager.endpoint = null
    fileDownloadManager.filename = null
  }
}

export default fileDownloadManager