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134 lines
3.3 KiB
134 lines
3.3 KiB
'use strict';
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/**
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* 微信相关业务
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*/
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const {
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wxConfigMp,
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wxConfigApp,
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} = require('config')
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const crypto = require('crypto')
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const db = uniCloud.database();
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/**
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* 微信小程序授权登录获取session_key
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* @param {Object} options
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* @param {String} options.code 小程序code
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*
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* @param {String} options.encryptedData 可选，存在encryptedData和iv时返回用户信息（包含unionid）
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* @param {String} options.iv 可选
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*/
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const mpWxGetSessionKey = async options=>{
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const {code, encryptedData, iv} = options;
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const {appId, secret} = wxConfigMp;
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let url = 'https://api.weixin.qq.com/sns/jscode2session';
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url += '?appid=' + appId;
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url += '&secret=' + secret;
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url += '&js_code=' + code + '&grant_type=authorization_code';
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const res = await uniCloud.httpclient.request(url, {
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method: 'GET',
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dataType: 'json'
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})
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const data = res.res.data;
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if(data.errcode){
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return {
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status: 0,
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msg: 'appid错误',
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data,
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appId
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}
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}
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if(!data.session_key){
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return {
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status: 0,
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msg: '获取微信授权失败',
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data
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}
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}
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if(!encryptedData || !iv){
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return {
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status: 1,
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openid: data.openid,
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session_key: data.session_key
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}
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}
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const userInfo = WXBizDataCrypt({
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sessionKey: data.session_key,
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encryptedData,
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iv
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})
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return {
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status: 1,
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session_key: data.session_key,
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...userInfo
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}
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}
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/**
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* 获取AccessToken
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*/
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const getAccessToken = async options=>{
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const accData = await db.collection('mix-access-token').get();
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let accInfo = {};
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if(accData.data.length === 1){
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accInfo = accData.data[0]
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//提前10分钟重新拉取
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if(accInfo.access_token && accInfo.expires_in*1000 > + new Date() - accInfo.add_time - 10*60*1000){
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return accInfo.access_token
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}
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}
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const {appId, secret} = wxConfigMp;
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let url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential';
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url += '&appid=' + appId;
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url += '&secret=' + secret;
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const res = await uniCloud.httpclient.request(url, {
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method: 'GET',
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dataType: 'json'
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})
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await db.collection('mix-access-token').doc(accInfo._id || '1').set({
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access_token: res.data.access_token,
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expires_in: res.data.expires_in,
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add_time: + new Date()
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})
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return res.data.access_token;
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}
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/**
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* 解密encryptedData 获取unionid
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* @param {Object} options
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* @param {String} options.sessionKey
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* @param {String} options.encryptedData
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* @param {String} options.iv
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*/
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const WXBizDataCrypt = options=>{
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const appId = wxConfigMp.appId;
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let {sessionKey, encryptedData, iv} = options;
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sessionKey = new Buffer(sessionKey, 'base64')
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encryptedData = new Buffer(encryptedData, 'base64')
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iv = new Buffer(iv, 'base64')
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let decoded;
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try {
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// 解密
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let decipher = crypto.createDecipheriv('aes-128-cbc', sessionKey, iv)
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// 设置自动 padding 为 true，删除填充补位
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decipher.setAutoPadding(true)
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decoded = decipher.update(encryptedData, 'binary', 'utf8')
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decoded += decipher.final('utf8')
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decoded = JSON.parse(decoded)
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} catch (err) {
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throw new Error('Illegal Buffer')
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}
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if (decoded.watermark.appid !== appId) {
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throw new Error('Illegal Buffer')
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}
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return decoded
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}
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module.exports = {
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mpWxGetSessionKey,
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WXBizDataCrypt,
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getAccessToken
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}
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