微信公众号获取AccessToken

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获取AccessToken

Laf代码

创建函数，函数名为 wx-utils

import cloud from '@lafjs/cloud'
const APP_ID = process.env.APP_ID
const APP_SECRET = process.env.APP_SECRET
const ACCESS_TOKEN_KEY = "access_token"

export async function getCachedAccessToken() {
  let accessToken = await cloud.shared.get(ACCESS_TOKEN_KEY)
  //判断本地缓存中是否存有 AccessToken
  if (!accessToken) {
    let access_token = await getAccessToken(APP_ID, APP_SECRET);
    await cloud.shared.set(ACCESS_TOKEN_KEY, access_token)
    return access_token.access_token
  } else {
    let {
      expires_in,
      access_token
    } = accessToken;
    const nowTime = new Date().getTime()
    if (nowTime >= expires_in) {
      // 已过期，并重新获取
      let access_token = await getAccessToken(APP_ID, APP_SECRET);
      await cloud.shared.set(ACCESS_TOKEN_KEY, access_token)
      return access_token.access_token
    } else {
      //查询的数据有效，直接返回数据
      return access_token
    }
  }
}

async function delCacheAccessToken() {
  await cloud.shared.delete(ACCESS_TOKEN_KEY)
}

async function getAccessToken(appid: string, secret: string) {
  const res = await cloud.fetch({
    url: `https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=${appid}&secret=${secret}`,
    method: 'GET'
  })
  //{"access_token":"68_vyJw32Dglo9Xa_18uUS_02JWy6UknsSqm84tx5kYEBSLl8nzp7Mtj-jWZmeEyyI3YTOVtGzgJcDs33MprjrRbX-5LJ5w_wZ2emNDf0PsODmCmjfnMT9oT-lpO9cMRAfAIAWBK","expires_in":7200}
  console.info("getAccessToken", res.data)
  if (res.data.errcode) {
    return null
  }
  res.data.expires_in = 7000000 + new Date().getTime()
  return res.data
}

代码解释

1. const APP_ID = process.env.APP_ID

   process.env是取的Laf的环境变量，具体说明点击查看：环境变量设置

   APP_ID和APP_SECRET取的是小程序里面的值，具体说明点击查看：获取AppId和AppSecret

2. cloud.shared

   使用的是Laf全局缓存，具体请看：Laf全局缓存

常见错误

问题就是不在白名单

{
  errcode: 40164,
  errmsg: 'invalid ip 121.41.21.175 ipv6 ::ffff:121.41.21.175, not in whitelist rid: 64f5e5b6-60e6c880-44619401'
}

解决方式：