TypeError：无法读取 null 的属性“拆分”

Question

我尝试进行身份验证以连接到 Google API 以使用 Google Analytics。这是我的代码：

'use strict'


const fs = require('fs')
const open = require('open')
const Fs = require('fs')
const Google = require('googleapis')
const Url = require('url')
const Http = require('http')


const CREDENTIALS_DIR = './.credentials/'
const SECRET_PATH = CREDENTIALS_DIR + 'google-analytics-secret.json'
const TOKEN_PATH = CREDENTIALS_DIR + 'google-analytics-accesstoken.json'


let auth = loadCredentials()
const oauth2Client = new Google.auth.OAuth2(
  auth.CLIENT_ID,
  auth.CLIENT_SECRET,
  auth.REDIRECT_URL)

function loadCredentials () {

  try {
    let secret = Fs.readFileSync(SECRET_PATH)
    console.log('Credentials successfully loaded from file.')
    return {
      CLIENT_ID: JSON.parse(secret).web.client_id,
      CLIENT_SECRET: JSON.parse(secret).web.client_secret,
      REDIRECT_URL: JSON.parse(secret).web.redirect_uris[0]
    }
  }
  catch (err) {
    if (err.code !== 'ENOENT') {
      throw err
    }
    else {
      console.log('Credentials successfully loaded from environment.')
      return {
        CLIENT_ID: process.env.GOOGLE_CLIENT_ID,
        CLIENT_SECRET: process.env.GOOGLE_CLIENT_SECRET,
        REDIRECT_URL: 'http://localhost:1234/'
      }
    }
  }
}

function getScopes () {

  return [
  'https://www.googleapis.com/auth/drive.readonly',
  'https://www.googleapis.com/auth/analytics.readonly'
  ]
}


function getAuthCallbackServer () {

  let url = oauth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: getScopes()
  })

  open(url, 'chrome')

  let server = Http.createServer(handleAuthCallback)

  server.listen(9999, () => {
    console.log('Server listening on: http://localhost:1234')
  })
}


// Parse Code sent by Google
function handleAuthCallback (req, res) {

  let parse = Url.parse(req.url)
  let code = parse.query.split('=').pop()
  console.log(`Got code: ${code}`)

  res.writeHead(200)
  res.end('Awesome... Got the Code')

}

getAuthCallbackServer()

我尝试使用函数使其模块化，但出现以下错误（在 handleAuthCallback 函数内部）：

TypeError: Cannot read property 'split' of null

这是我在handleAuthCallback函数中尝试打印parse时得到的对象：

Url {
protocol: null,
slashes: null,
auth: null,
host: null,
port: null,
hostname: null,
hash: null,
search: '?code=x/xxxxxxxxxxxxxxxxxxxxxxxx',
query: 'code=x/xxxxxxxxxxxxxxxxxxxxxxxx',
pathname: '/',
path: '/?code=x/xxxxxxxxxxxxxxxxxxxxxxxx',
href: '/?code=x/xxxxxxxxxxxxxxxxxxxxxxxx' }

我并不真正理解这个错误，因为它在我重构我的代码之前就起作用了。关于我可能错在哪里的任何建议？

谢谢。

Answer 1

正在调用此function：

// Parse Code sent by Google
function handleAuthCallback (req, res) {

  let parse = Url.parse(req.url)
  let code = parse.query.split('=').pop()
  console.log(`Got code: ${code}`)

  res.writeHead(200)
  res.end('Awesome... Got the Code')

}

这里指定的回调发生时：

let server = Http.createServer(handleAuthCallback)

Url 在这里定义：

const Url = require('url')

解析是Url.parse(req.url) 的结果。这没有查询属性，所以parse.query 是undefined，因此parse.query.split 会产生错误，有可能当你进行一些重构时，定义query 的代码被删除了。

Answer 2

假设query 是对象，试试这个：

let parse = Url.parse(req.url);
let code = parse.query.code;