axios/lib/core/mergeConfig.js

Promise based HTTP client for the browser and node.js

'use strict';

var utils = require('../utils');

/**
 * Config-specific merge-function which creates a new config-object
 * by merging two configuration objects together.
 *
 * @param {Object} config1
 * @param {Object} config2
 * @returns {Object} New object resulting from merging config2 to config1
 */
module.exports = function mergeConfig(config1, config2) {
  // eslint-disable-next-line no-param-reassign
  config2 = config2 || {};
  // Use a null-prototype object so a polluted Object.prototype cannot leak
  // values (e.g. transport, adapter) into the returned config via inheritance.
  var config = Object.create(null);

  function getOwn(source, prop) {
    return utils.hasOwnProperty(source, prop) ? source[prop] : undefined;
  }

  function hasOwn(source, prop) {
    return utils.hasOwnProperty(source, prop);
  }

  function getMergedValue(target, source) {
    if (utils.isPlainObject(target) && utils.isPlainObject(source)) {
      return utils.merge(target, source);
    } else if (utils.isEmptyObject(source)) {
      return utils.merge({}, target);
    } else if (utils.isPlainObject(source)) {
      return utils.merge({}, source);
    } else if (utils.isArray(source)) {
      return source.slice();
    }
    return source;
  }

  // eslint-disable-next-line consistent-return
  function mergeDeepProperties(prop) {
    if (hasOwn(config2, prop) && !utils.isUndefined(config2[prop])) {
      return getMergedValue(getOwn(config1, prop), config2[prop]);
    } else if (hasOwn(config1, prop) && !utils.isUndefined(config1[prop])) {
      return getMergedValue(undefined, config1[prop]);
    }
  }

  // eslint-disable-next-line consistent-return
  function valueFromConfig2(prop) {
    if (hasOwn(config2, prop) && !utils.isUndefined(config2[prop])) {
      return getMergedValue(undefined, config2[prop]);
    }
  }

  // eslint-disable-next-line consistent-return
  function defaultToConfig2(prop) {
    if (hasOwn(config2, prop) && !utils.isUndefined(config2[prop])) {
      return getMergedValue(undefined, config2[prop]);
    } else if (hasOwn(config1, prop) && !utils.isUndefined(config1[prop])) {
      return getMergedValue(undefined, config1[prop]);
    }
  }

  // eslint-disable-next-line consistent-return
  function mergeDirectKeys(prop) {
    if (hasOwn(config2, prop)) {
      return getMergedValue(getOwn(config1, prop), config2[prop]);
    } else if (hasOwn(config1, prop)) {
      return getMergedValue(undefined, config1[prop]);
    }
  }

  var mergeMap = {
    'url': valueFromConfig2,
    'method': valueFromConfig2,
    'data': valueFromConfig2,
    'baseURL': defaultToConfig2,
    'transformRequest': defaultToConfig2,
    'transformResponse': defaultToConfig2,
    'paramsSerializer': defaultToConfig2,
    'timeout': defaultToConfig2,
    'timeoutMessage': defaultToConfig2,
    'withCredentials': defaultToConfig2,
    'withXSRFToken': defaultToConfig2,
    'adapter': defaultToConfig2,
    'responseType': defaultToConfig2,
    'xsrfCookieName': defaultToConfig2,
    'xsrfHeaderName': defaultToConfig2,
    'onUploadProgress': defaultToConfig2,
    'onDownloadProgress': defaultToConfig2,
    'decompress': defaultToConfig2,
    'maxContentLength': defaultToConfig2,
    'maxBodyLength': defaultToConfig2,
    'beforeRedirect': defaultToConfig2,
    'transport': defaultToConfig2,
    'httpAgent': defaultToConfig2,
    'httpsAgent': defaultToConfig2,
    'cancelToken': defaultToConfig2,
    'socketPath': defaultToConfig2,
    'allowedSocketPaths': defaultToConfig2,
    'responseEncoding': defaultToConfig2,
    'validateStatus': mergeDirectKeys
  };

  utils.forEach(Object.keys(config1).concat(Object.keys(config2)), function computeConfigValue(prop) {
    if (prop === '__proto__' || prop === 'constructor' || prop === 'prototype') {
      return;
    }
    var merge = utils.hasOwnProperty(mergeMap, prop) ? mergeMap[prop] : mergeDeepProperties;
    var configValue = merge(prop);
    (utils.isUndefined(configValue) && merge !== mergeDirectKeys) || (config[prop] = configValue);
  });

  return config;
};