Source: sdk-file/src/alipay/request.js

const utils = require('core-module/utils')
const constants = require('core-module/constants')
const HError = require('core-module/HError')

class RequestError extends HError {
  mapErrorMessage(code) {
    switch (code) {
    case 11:
      return '无权跨域'
    case 12:
      return '网络出错'
    case 13:
      return '超时'
    case 14:
      return '解码失败'
    case 19:
      return 'HTTP 错误'
    default:
      return '未知错误'
    }
  }
}

const extractErrorMsg = (res) => {
  switch(res.status) {
  case constants.STATUS_CODE.NOT_FOUND:
    return 'not found'
  case constants.STATUS_CODE.UNAUTHORIZED:
    return 'unauthorized'
  default:
    // res.errorMessage 为 my.request 返回的错误信息
    return res.data.error_msg || res.data.message || res.errorMessage || ''
  }
}

/**
 * 网络请求
 * @function
 * @name request
 * @memberof BaaS
 * @param {BaaS.AlipayRequestParams} params 参数
 * @return {Promise<BaaS.Response<any>>}
 */
const createRequestFn = BaaS => ({url, method = 'GET', data = {}, header = {}, headers = {}, dataType = 'json'}) => {
  const config = BaaS._config
  return utils.mergeRequestHeader(Object.assign({
    'content-type': 'application/json',
  }, header, headers)).then(headers => {
    return new Promise((resolve, reject) => {
      if (!config.CLIENT_ID) {
        return reject(new HError(602))
      }
      // 兼容 PUT 与 DELETE 请求，支付宝暂时只支持 GET 与 POST 两种请求
      if (method.toUpperCase() === 'PUT' || method.toUpperCase() === 'DELETE') {
        headers['X-Hydrogen-Request-Method'] = method
        method = 'POST'
      }
      if (!/https?:\/\//.test(url)) {
        const API_HOST = BaaS._polyfill.getAPIHost()
        url = API_HOST.replace(/\/$/, '') + '/' + url.replace(/^\//, '')
      }
      let requestFn = my.canIUse('request') ? my.request : my.httpRequest
      requestFn({
        method: method,
        url: url,
        data: data,
        headers,
        dataType,
        success: res => {
          res.statusCode = res.status
          resolve(res)
        },
        fail: res => {
          res.statusCode = res.status
          // 开发工具的 bug, 返回 200 才走 success
          if (res.status >= 200 && res.status < 300) {
            return resolve(res)
          }
          if (res.error == 19) {
            return reject(new HError(res.status, extractErrorMsg(res)))
          }
          reject(new RequestError(parseInt(res.error), res.errorMessage))
        }
      })
      utils.log(constants.LOG_LEVEL.INFO, 'Request => ' + url)
    })
  })
}

module.exports = function (BaaS) {
  BaaS.request = createRequestFn(BaaS)
}

module.exports.RequestError = RequestError
module.exports.extractErrorMsg = extractErrorMsg