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Viewing file:     adapters.js (3.21 KB)      -rw-r--r--

import utils from '../utils.js';
import httpAdapter from './http.js';
import xhrAdapter from './xhr.js';
import * as fetchAdapter from './fetch.js';
import AxiosError from "../core/AxiosError.js";

/**
 * Known adapters mapping.
 * Provides environment-specific adapters for Axios:
 * - `http` for Node.js
 * - `xhr` for browsers
 * - `fetch` for fetch API-based requests
 * 
 * @type {Object<string, Function|Object>}
 */
const knownAdapters = {
  http: httpAdapter,
  xhr: xhrAdapter,
  fetch: {
    get: fetchAdapter.getFetch,
  }
};

// Assign adapter names for easier debugging and identification
utils.forEach(knownAdapters, (fn, value) => {
  if (fn) {
    try {
      Object.defineProperty(fn, 'name', { value });
    } catch (e) {
      // eslint-disable-next-line no-empty
    }
    Object.defineProperty(fn, 'adapterName', { value });
  }
});

/**
 * Render a rejection reason string for unknown or unsupported adapters
 * 
 * @param {string} reason
 * @returns {string}
 */
const renderReason = (reason) => `- ${reason}`;

/**
 * Check if the adapter is resolved (function, null, or false)
 * 
 * @param {Function|null|false} adapter
 * @returns {boolean}
 */
const isResolvedHandle = (adapter) => utils.isFunction(adapter) || adapter === null || adapter === false;

/**
 * Get the first suitable adapter from the provided list.
 * Tries each adapter in order until a supported one is found.
 * Throws an AxiosError if no adapter is suitable.
 * 
 * @param {Array<string|Function>|string|Function} adapters - Adapter(s) by name or function.
 * @param {Object} config - Axios request configuration
 * @throws {AxiosError} If no suitable adapter is available
 * @returns {Function} The resolved adapter function
 */
function getAdapter(adapters, config) {
  adapters = utils.isArray(adapters) ? adapters : [adapters];

  const { length } = adapters;
  let nameOrAdapter;
  let adapter;

  const rejectedReasons = {};

  for (let i = 0; i < length; i++) {
    nameOrAdapter = adapters[i];
    let id;

    adapter = nameOrAdapter;

    if (!isResolvedHandle(nameOrAdapter)) {
      adapter = knownAdapters[(id = String(nameOrAdapter)).toLowerCase()];

      if (adapter === undefined) {
        throw new AxiosError(`Unknown adapter '${id}'`);
      }
    }

    if (adapter && (utils.isFunction(adapter) || (adapter = adapter.get(config)))) {
      break;
    }

    rejectedReasons[id || '#' + i] = adapter;
  }

  if (!adapter) {
    const reasons = Object.entries(rejectedReasons)
      .map(([id, state]) => `adapter ${id} ` +
        (state === false ? 'is not supported by the environment' : 'is not available in the build')
      );

    let s = length ?
      (reasons.length > 1 ? 'since :\n' + reasons.map(renderReason).join('\n') : ' ' + renderReason(reasons[0])) :
      'as no adapter specified';

    throw new AxiosError(
      `There is no suitable adapter to dispatch the request ` + s,
      'ERR_NOT_SUPPORT'
    );
  }

  return adapter;
}

/**
 * Exports Axios adapters and utility to resolve an adapter
 */
export default {
  /**
   * Resolve an adapter from a list of adapter names or functions.
   * @type {Function}
   */
  getAdapter,

  /**
   * Exposes all known adapters
   * @type {Object<string, Function|Object>}
   */
  adapters: knownAdapters
};