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91 lines
2.7 KiB
91 lines
2.7 KiB
var { appid
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, secret } = require('../config/index');
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var axios = require('axios');
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var sha1 = require('sha1');
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/// 请求获取 微信 access-token 接口地址
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/// https请求方式: GET https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET
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/**
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* 获取 ticket
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*/
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var getTicket = async function () {
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// console.log('>>>appid', appid)
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// console.log('>>>secret', secret)
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let token_url = `https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=${appid}&secret=${secret}`
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let token_data = await axios.get(token_url)
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// console.log('>>>token_data', token_data.data)
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let access_token = token_data.data.access_token || '' // 得到 access_token
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let ticket_url = `https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=${access_token}&type=jsapi`
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// console.log('>>>ticket_url', ticket_url)
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let ticket_data = await axios.get(ticket_url) //得到 jsapi_ticket
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// console.log('>>>ticket_data', ticket_data.data)
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return ticket_data.data.errcode === 0
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? ticket_data.data.ticket
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: ''
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}
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/**
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* 生成随机字符串
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*/
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var createNonceStr = function () {
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return Math.random().toString(36).substring(2, 15)
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}
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/**
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* 生成时间戳
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*/
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var createTimestamp = function () {
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return parseInt(new Date().getTime() / 1000) + ''
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}
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/**
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* 生成 sign 签名方法
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* @param {*} url
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*/
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var sign = async function (url) {
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let jsapi_ticket = await getTicket()
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/// 均为小写字符
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var defOption = {
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jsapi_ticket: jsapi_ticket,
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noncestr: createNonceStr(),
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timestamp: createTimestamp(),
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url
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}
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var keys = Object.keys(defOption)
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keys.sort() // 字段排序
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var options = {}
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/// 生成签名时键名小写
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var string = []
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for (let key in keys) {
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options[keys[key]] = defOption[keys[key]]
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string.push([keys[key].toLowerCase(), defOption[keys[key]]].join('='))
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}
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string = string.join('&')
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var signature = sha1(string) // 生成签名
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options.signature = signature
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options.appid = appid
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return options
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// 签名生成规则如下：
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// 1. 参与签名的字段包括noncestr（随机字符串）, 有效的jsapi_ticket, timestamp（时间戳）, url（当前网页的URL，不包含#及其后面部分） 。
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// 2. 对所有待签名参数按照字段名的ASCII 码从小到大排序（字典序）后
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// 3. 使用URL键值对的格式（即key1=value1&key2=value2…）拼接成字符串string1。这里需要注意的是所有参数名均为小写字符。
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// 4. 对string1作sha1加密，字段名和字段值都采用原始值，不进行URL 转义。
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}
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module.exports = sign
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