@wordpress/api-fetch/build-module/middlewares/preloading.js

Utility to make WordPress REST API requests.

/**
 * WordPress dependencies
 */
import { addQueryArgs, getQueryArgs, normalizePath } from '@wordpress/url';

/**
 * @param {Record<string, any>} preloadedData
 * @return {import('../types').APIFetchMiddleware} Preloading middleware.
 */
function createPreloadingMiddleware(preloadedData) {
  const cache = Object.fromEntries(Object.entries(preloadedData).map(([path, data]) => [normalizePath(path), data]));
  return (options, next) => {
    const {
      parse = true
    } = options;
    /** @type {string | void} */
    let rawPath = options.path;
    if (!rawPath && options.url) {
      const {
        rest_route: pathFromQuery,
        ...queryArgs
      } = getQueryArgs(options.url);
      if (typeof pathFromQuery === 'string') {
        rawPath = addQueryArgs(pathFromQuery, queryArgs);
      }
    }
    if (typeof rawPath !== 'string') {
      return next(options);
    }
    const method = options.method || 'GET';
    const path = normalizePath(rawPath);
    if ('GET' === method && cache[path]) {
      const cacheData = cache[path];

      // Unsetting the cache key ensures that the data is only used a single time.
      delete cache[path];
      return prepareResponse(cacheData, !!parse);
    } else if ('OPTIONS' === method && cache[method] && cache[method][path]) {
      const cacheData = cache[method][path];

      // Unsetting the cache key ensures that the data is only used a single time.
      delete cache[method][path];
      return prepareResponse(cacheData, !!parse);
    }
    return next(options);
  };
}

/**
 * This is a helper function that sends a success response.
 *
 * @param {Record<string, any>} responseData
 * @param {boolean}             parse
 * @return {Promise<any>} Promise with the response.
 */
function prepareResponse(responseData, parse) {
  if (parse) {
    return Promise.resolve(responseData.body);
  }
  try {
    return Promise.resolve(new window.Response(JSON.stringify(responseData.body), {
      status: 200,
      statusText: 'OK',
      headers: responseData.headers
    }));
  } catch {
    // See: https://github.com/WordPress/gutenberg/issues/67358#issuecomment-2621163926.
    Object.entries(responseData.headers).forEach(([key, value]) => {
      if (key.toLowerCase() === 'link') {
        responseData.headers[key] = value.replace(/<([^>]+)>/, (/** @type {any} */_, /** @type {string} */url) => `<${encodeURI(url)}>`);
      }
    });
    return Promise.resolve(parse ? responseData.body : new window.Response(JSON.stringify(responseData.body), {
      status: 200,
      statusText: 'OK',
      headers: responseData.headers
    }));
  }
}
export default createPreloadingMiddleware;
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