Node.js access_token implements WeChat access and refresh examples

This article mainly introduces examples of Node.js WeChat access_token (jsapi_ticket) access and refresh, which has certain reference value. Those who are interested can learn more about it. I hope it can help everyone.

access_token

There are two access_tokens in WeChat documents: ordinary access_token and web page authorization access_token. For specific differences, please refer to: https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140842

The access_token mentioned below are all ordinary access_token

1. First of all Let’s first take a look at how to request access_token? WeChat public platform technical documentation

GET request: https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET

Normal return: {"access_token":"ACCESS_TOKEN","expires_in":7200}

Error return: {"errcode":40013,"errmsg": "invalid appid"}

2. So the code to obtain access_token is as follows:

const request = require('request') // 请安装第三方包 request

request.get({
  uri: 'https://api.weixin.qq.com/cgi-bin/token',
  json: true,
  qs: {
   grant_type: 'client_credential',
   appid: APPID, // APPID请换成你的 appid
   secret: APPSECRET // APPSECRET请换成你的 appsecret
  }
 }, (err, res, body) => {
  if (err) {
   console.log(err)
   return
  }
  console.log(body)
  if (body.errcode) {
   // 返回错误时的处理
   return
  }
})

3. guard_dog implements data persistence and regular refresh

guard_dog will generate .dog files, each file corresponds to a KEY

const guard_dog = require('guard_dog') // 请安装第三方包 guard_dog

guard_dog.init(KEY, (handler) => { // KEY是guard_dog存取数据的键名
 // 拿到数据后调用 handler
 handler(DATA, EXPIREDS_IN) // DATA是要持久化的数据，EXPIREDS_IN是数据的有效时间，单位是秒
}, DIR) // DIR是 .dog 文件的存放目录，这个参数可以不传

4. Now combine the above two pieces of code to get what we want The effect

const request = require('request')
const guard_dog = require('guard_dog')

guard_dog.init('ACCESS_TOKEN', (handler) => {
 request.get({
  uri: 'https://api.weixin.qq.com/cgi-bin/token',
  json: true,
  qs: {
   grant_type: 'client_credential',
   appid: APPID, // APPID请换成你的 appid
   secret: APPSECRET // APPSECRET请换成你的 appsecret
  }
 }, (err, res, body) => {
  if (err) {
   console.log(err)
   return
  }
  console.log(body)
  if (body.errcode) {
   return
  }
  handler(body.access_token, body.expires_in)
 })
}) // 如有需要指定目录，可以再给 guard_dog.init 多传个参数

5. After guard_dog initializes this key, all valid values ​​obtained. The code for guard_dog to obtain the value is as follows:

guard_dog.get('ACCESS_TOKEN', (data) => { // 上面初始化时用的键名为'ACCESS_TOKEN'，所以这里取值也要用这个键名
 // 在这里拿到的 data 就是 access_token 了
})

6. If you want to make it more convenient, you can directly encapsulate it into a module

access_token.js

const request = require('request')
const guard_dog = require('guard_dog')
// 加载这个模块的时候给 ACCESS_TOKEN 这个键名初始化
guard_dog.init('ACCESS_TOKEN', (handler) => {
 request.get({
  uri: 'https://api.weixin.qq.com/cgi-bin/token',
  json: true,
  qs: {
   grant_type: 'client_credential',
   appid: APPID, // APPID请换成你的 appid
   secret: APPSECRET // APPSECRET请换成你的 appsecret
  }
 }, (err, res, body) => {
  if (err) {
   console.log(err)
   return
  }
  console.log(body)
  if (body.errcode) {
   return
  }
  handler(body.access_token, body.expires_in)
 })
}) 
// 只要向外暴露一个获取值的方法就可以了
module.exports = function (callback) {
 guard_dog.get('ACCESS_TOKEN', callback)
}

Usage:

const access_token = require('./access_token') // 这里把这个模块与 access_token 模块当成在同一目录下来作为例子。
access_token((data) => {
 // 这个 data 就是 access_token
})

jsapi_ticket

jsapi_ticket Official document description

The above example about access_token has been explained in detail. The processing of jsapi_ticket is also very similar, so the code is directly posted below:

(One thing to note: getting jsapi_ticket needs to rely on access_token. The following code directly relies on the above. Written in access_token.js)

jsapi_ticket.js

const request = require('request')
const guard_dog = require('guard_dog')
const access_token = require('./access_token')

guard_dog.init('JSAPI_TICKET', (handler) => {
 access_token((access_token) => {
  request.get({
   uri: 'https://api.weixin.qq.com/cgi-bin/ticket/getticket',
   json: true,
   qs: {
    access_token: access_token,
    type: 'jsapi'
   }
  }, (err, res, body) => {
   if (err) {
    console.log(err)
    return
   }
   console.log(body)
   if (body.errcode) {
    return
   }
   handler(body.ticket, body.expires_in)
  })
 })
})

module.exports = function (callback) {
 guard_dog.get('JSAPI_TICKET', callback)
}

Use:

const jsapi_ticket = require('./jsapi_ticket')
jsapi_ticket((data) => {
 // 这个 data 就是 jsapi_ticket
})

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