helper.js
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/**
* Created by Tommy Huang on 18/03/21.
*/
const config = require('config-lite')({
config_basedir: __dirname,
config_dir: 'config'
})
const fs = require('fs')
const util = require('util')
const axios = require('axios')
const {URL} = require('url')
const crypto = require('crypto')
const FormData = require('form-data')
/**
* 获取用户微信 Token
* @param {string} code 微信返回的用户 code
*/
exports.getUserWxAccessTokenInfo = async function(code) {
const {data} = await axios.get(`https://api.weixin.qq.com/sns/oauth2/access_token?appid=${config.wx.appId}&secret=${config.wx.appSecret}&code=${code}&grant_type=authorization_code`)
if (data.access_token && data.refresh_token && data.openid) {
return data
} else {
return false
}
}
/**
* 刷新用户的 Token
* @param {string} refreshToken 微信返回的用户 refresh_token
*/
exports.refreshUserWxToken = async function(refreshToken) {
const {data} = await axios.get(`https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=${config.wx.appId}&grant_type=refresh_token&refresh_token=${refreshToken}`)
if (data.access_token && data.refresh_token && data.openid) {
return data
} else {
return false
}
}
/**
* 拉取用户信息
* @param {string} token 微信返回的用户 access_token
* @param {string} openId 微信返回的用户 openid
*/
exports.getUserWxInfo = async function(token, openId) {
const {data} = await axios.get(`https://api.weixin.qq.com/sns/userinfo?access_token=${token}&openid=${openId}&lang=zh_CN`)
if (data.openid && data.nickname && data.headimgurl) {
return data
} else {
return false
}
}
/**
* 发送验证码
* @param {string} phone 要发送验证码的手机号
*/
exports.sendVerificationCode = async function (phone) {
if (!phone) return {success: false, msg: '缺少参数'}
const code = randomWord(false, 4, 4)
var url = `${config.sms.url}?account=${config.sms.account}&password=${config.sms.password}&mobile=${phone}&content=【七彩贷】验证码：${code}，如非本人操作，请忽略本短信`
url = new URL(url).href
let { data } = await axios.get(url)
console.log(data)
if (data.status === 0) {
return {success: true, code: code}
} else {
return {success: false, msg: data.desc}
}
}
/**
* 产生任意长度随机数字组合
* @param {bool} randomFlag 是否任意长度
* @param {num} min 任意长度最小位[固定位数]
* @param {num} max 任意长度最大位
*/
function randomWord (randomFlag, min, max) {
let str = ""
let range = min
let arr = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
if (randomFlag) {
range = Math.round(Math.random() * (max - min)) + min
}
for (let i = 0 ; i < range; i++) {
let pos = Math.round(Math.random() * (arr.length-1))
str += arr[pos]
}
return str
}
/**
* 生成腾讯云接口鉴权签名
*/
exports.tencentCloudAuthorization = function () {
const current = Math.floor(Date.now() / 1000)
const rand = Math.floor(Math.random() * Math.pow(10, 10))
const expire = current + 30
const origin = `a=${config.idOCR.appid}&b=${config.idOCR.bucket}&k=${config.idOCR.SecretId}&e=${expire}&t=${current}&r=${rand}&u=0&f=`
var auth = crypto.createHmac('sha1', config.idOCR.SecretKey).update(origin).digest()
auth = Buffer.concat([auth, Buffer.from(origin, 'utf-8')])
return auth.toString('base64')
}
/**
* 获取腾讯云身份证识别接口结果
* @param {object File} file 身份证图片文件
* @param {integer} type 图片类型：正面：0， 反面：1
* @param {string} auth 接口鉴权签名
*/
getIdORCResult = async function(file, type, auth) {
let form = new FormData()
form.append('appid', config.idOCR.appid)
form.append('bucket', config.idOCR.bucket)
form.append('card_type', type)
form.append('image', file)
let formHead = form.getHeaders()
formHead.authorization = auth
let {data} = await axios.post(config.idOCR.url, form, {headers: formHead})
return data.result_list[0]
}
/**
* 异步写文件 Promise 版
*/
exports.writeFile = util.promisify(fs.writeFile)