config.test.js

import axios from 'axios'
import httpAdapter from 'axios/lib/adapters/http'

import { API_URL } from '../src/config/environment'

axios.defaults.host = API_URL
axios.defaults.adapter = httpAdapter

request.js

import axios from 'axios'

import { API_URL } from '../config/environment'
import { parseURL, parseConfig } from '../utils/request'

const instance = axios.create({
  baseURL: API_URL,
  headers: { 'Content-type': 'application/json; charset=UTF-8' },
})

const returnData = (response) => response.data
const handleResponseError = (error) => new Promise((resolve, reject) => reject(error.response.data))

const parseParams = (url, config, data) => (fn) => {
  if (fn === instance.delete || fn === instance.get) {
    return fn(parseURL(url), parseConfig(config))
      .then(returnData)
      .catch(handleResponseError)
  }
  return fn(parseURL(url), data, parseConfig(config))
    .then(returnData)
    .catch(handleResponseError)
}

export const post = (...params) => parseParams(...params)(instance.post)
export const patch = (...params) => parseParams(...params)(instance.patch)
export const put = (...params) => parseParams(...params)(instance.put)
export const upload = (...params) => parseParams(...params)(instance.post)
export const del = (...params) => parseParams(...params)(instance.delete)
export const get = (...params) => parseParams(...params)(instance.get)

instance.getURL = (url) => API_URL + parseURL(url)

export default instance

utils-request.js

const DEFAULT_AUTHORIZATION_KEYWORD = 'Token '
const DEFAULT_AUTHORIZATION_HEADER = 'Authorization'

const ensureTrailingAndLeadingSlash = (url) => `/${url}/`.replace(/\/\//g, '/')
export const parseURL = (url) => {
  if (Array.isArray(url)) {
    return ensureTrailingAndLeadingSlash(url.join('/'))
  }
  return ensureTrailingAndLeadingSlash(url)
}

export const parseConfig = ({ key, ...config } = {}) => {
  const newConfig = { headers: {}, ...config }
  if (key) {
    newConfig.headers[DEFAULT_AUTHORIZATION_HEADER] = `${DEFAULT_AUTHORIZATION_KEYWORD}${key}`
  }
  if (credentials) {
    newConfig.withCredentials = true
  }
  return newConfig
}