wechat.js
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/**
* 微信公众号签名获取
* @author: qiujun <jun.qiu@yoho.cn>
* @date: 14/11/2017
*/
const config = global.yoho.config;
const crypto = require('crypto');
const request = require('request-promise');
const WechatModel = require('../models/wechat');
const moment = require('moment');
const sha1 = (str) => {
const generator = crypto.createHash('sha1');
generator.update(str);
return generator.digest('hex');
};
// 微信 JS 接口签名校验工具 http://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=jsapisign
let getAccessToken = function(appId, secret, prefix) { // 获取access_token
return request({
url: prefix + 'token',
qs: {
grant_type: 'client_credential',
appid: appId,
secret: secret
},
json: true
}).then(res => {
// console.log('getAccessToken=' + JSON.stringify(res));
return res;
});
};
let getTicket = function(accessToken, appId, secret, prefix) { // 获取ticket
return request({
url: prefix + 'ticket/getticket',
qs: {
access_token: accessToken,
type: 'jsapi'
},
json: true
}).then(res => {
// console.log('getTicket=' + JSON.stringify(res));
return res;
});
};
let calcSigature = function(ticket_res) { // 计算signature
let appID = ticket_res.appID;
let ticket = ticket_res.access_ticket;
let nonceStr = Math.random().toString(36).substr(2, 15);
let timestamp = Math.floor(Date.now() / 1000) + '';
let url = ticket_res.url;
let str = `jsapi_ticket=${ticket}&noncestr=${nonceStr}×tamp=${timestamp}&url=${url}`;
let signature = sha1(str);
// console.log('calcSigature:',{appID, ticket, nonceStr, timestamp, url, str, signature});
return {
appId: appID,
nonceStr,
timestamp,
url,
signature
};
};
let getResult = function(wechat_res) { // 向微信接口获取access_token及ticket并计算signature
let appID = wechat_res.appID;
let appSecret = wechat_res.appSecret;
let prefix = wechat_res.prefix;
let mpPrefix = wechat_res.mpPrefix;
return getAccessToken(appID, appSecret, prefix)
.then(result => { // 先获取accessToken
let access_token = result.access_token;
return getTicket(access_token, appID, appSecret, mpPrefix)
.then(ticket_res => { // 通过accessToken获取ticket
// console.log('getResult=' + JSON.stringify(Object.assign({access_token: access_token, appID: appID}, ticket_res)));
return Object.assign({
access_token: access_token,
appID: appID
}, ticket_res);
});
});
};
const wechatShare = {
getSignPackage(req, res, next) {
const appID = config.wechat.appID;
const appSecret = config.wechat.appSecret;
const prefix = config.wechat.prefix;
const mpPrefix = config.wechat.mpPrefix;
const url = req.query.pageurl || 'http://www.yoho.cn';
req.ctx(WechatModel).getAccessKeys()
.then(keys_res => { // 先查询数据库中是否有access_token并且未过期
// console.log('keys_res:', keys_res);
if (keys_res.code === 200) { // code=200说明数据库中查找到数据并且未过期
delete keys_res.code;
return Promise.resolve(Object.assign({
appID,
url
}, keys_res));
} else if (keys_res.code === 201) {
// code=201说明数据库中没有数据,或者数据已过期,根据返回的type判断是添加还是更新
delete keys_res.code;
keys_res = Object.assign({
appID,
appSecret,
prefix,
mpPrefix,
url
}, keys_res);
return getResult(keys_res).then(ticket_res => {
let appId = ticket_res.appID;
let access_token = ticket_res.access_token || '';
let access_ticket = ticket_res.ticket || '';
let expired = parseInt(ticket_res.expires_in, 10) - 100 || 0;
let create_time = moment().format('YYYY-MM-DD HH:mm:ss') || '';
let expired_time = moment().add(expired, 'seconds').format('YYYY-MM-DD HH:mm:ss') || '';
// 获取到ticket信息之后把相关字段保存到数据库中
return req.ctx(WechatModel).saveAccessKeys(access_token, access_ticket, create_time, expired_time, keys_res.type)
.then(() => {
return {
appID: appId,
access_ticket: access_ticket,
url: url
};
});
});
}
})
.then(result => {
// console.log('result:', result);
let calc_res = calcSigature(result);
if (req.query.callback) {
return res.jsonp(calc_res);
} else {
return res.json(calc_res);
}
}).catch(next);
}
};
module.exports = wechatShare;