Copyright 2018 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at

import {createPartialResponse} from './createPartialResponse.mjs';

import './_version.mjs';

 * The range request plugin makes it easy for a request with a 'Range' header to
 * be fulfilled by a cached response.
 * It does this by intercepting the `cachedResponseWillBeUsed` plugin callback
 * and returning the appropriate subset of the cached response body.
 * @memberof workbox.rangeRequests
class Plugin {
   * @param {Object} options
   * @param {Request} options.request The original request, which may or may not
   * contain a Range: header.
   * @param {Response} options.cachedResponse The complete cached response.
   * @return {Promise<Response>} If request contains a 'Range' header, then a
   * new response with status 206 whose body is a subset of `cachedResponse` is
   * returned. Otherwise, `cachedResponse` is returned as-is.
   * @private
  async cachedResponseWillBeUsed({request, cachedResponse}) {
    // Only return a sliced response if there's something valid in the cache,
    // and there's a Range: header in the request.
    if (cachedResponse && request.headers.has('range')) {
      return await createPartialResponse(request, cachedResponse);

    // If there was no Range: header, or if cachedResponse wasn't valid, just
    // pass it through as-is.
    return cachedResponse;

export {Plugin};