text: 'use strict';
  const { wxAppConfig } = require('pconfig');
  exports.main = async (event, context) => {
  	//event为客户端上传的参数
  	console.log('event : ', event)
  	let params = event.params || {}
  	var tokenApiUrl =
  		`https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=${wxAppConfig.appid}&secret=${wxAppConfig.appsecret}`
  	
  	// 获取token
  	let getToken = await uniCloud.httpclient.request(tokenApiUrl, {
  		method: 'GET',
  		dataType: 'json'
  	})
  	let token = getToken.data.access_token
  	// 获取Ticket
  	var ticketApiUrl = `https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=${token}&type=jsapi`
  	let getTicket = await uniCloud.httpclient.request(ticketApiUrl, {
  		method: 'GET',
  		dataType: 'json'
  	})
  	let jsapi_ticket = getTicket.data.ticket
  	// 获取签名
  	let signature = sign(jsapi_ticket, params.url)
  	signature.appid = wxAppConfig.appid
  	return signature
  };
  var createNonceStr = function() {
  	return Math.random().toString(36).substr(2, 15);
  };
  
  var createTimestamp = function() {
  	return parseInt(new Date().getTime() / 1000) + '';
  };
  
  var raw = function(args) {
  	var keys = Object.keys(args);
  	keys = keys.sort()
  	var newArgs = {};
  	keys.forEach(function(key) {
  		newArgs[key.toLowerCase()] = args[key];
  	});
  
  	var string = '';
  	for (var k in newArgs) {
  		string += '&' + k + '=' + newArgs[k];
  	}
  	string = string.substr(1);
  	return string;
  };
  var encodeUTF8 = function(s) {
  	var i, r = [],
  		c, x;
  	for (i = 0; i < s.length; i++)
  		if ((c = s.charCodeAt(i)) < 0x80) r.push(c);
  		else if (c < 0x800) r.push(0xC0 + (c >> 6 & 0x1F), 0x80 + (c & 0x3F));
  	else {
  		if ((x = c ^ 0xD800) >> 10 == 0) //对四字节UTF-16转换为Unicode
  			c = (x << 10) + (s.charCodeAt(++i) ^ 0xDC00) + 0x10000,
  			r.push(0xF0 + (c >> 18 & 0x7), 0x80 + (c >> 12 & 0x3F));
  		else r.push(0xE0 + (c >> 12 & 0xF));
  		r.push(0x80 + (c >> 6 & 0x3F), 0x80 + (c & 0x3F));
  	};
  	return r;
  }
  
  // 字符串加密成 hex 字符串
  var sha1 = function(s) {
  	var data = new Uint8Array(encodeUTF8(s))
  	var i, j, t;
  	var l = ((data.length + 8) >>> 6 << 4) + 16,
  		s = new Uint8Array(l << 2);
  	s.set(new Uint8Array(data.buffer)), s = new Uint32Array(s.buffer);
  	for (t = new DataView(s.buffer), i = 0; i < l; i++) s[i] = t.getUint32(i << 2);
  	s[data.length >> 2] |= 0x80 << (24 - (data.length & 3) * 8);
  	s[l - 1] = data.length << 3;
  	var w = [],
  		f = [
  			function() { return m[1] & m[2] | ~m[1] & m[3]; },
  			function() { return m[1] ^ m[2] ^ m[3]; },
  			function() { return m[1] & m[2] | m[1] & m[3] | m[2] & m[3]; },
  			function() { return m[1] ^ m[2] ^ m[3]; }
  		],
  		rol = function(n, c) { return n << c | n >>> (32 - c); },
  		k = [1518500249, 1859775393, -1894007588, -899497514],
  		m = [1732584193, -271733879, null, null, -1009589776];
  	m[2] = ~m[0], m[3] = ~m[1];
  	for (i = 0; i < s.length; i += 16) {
  		var o = m.slice(0);
  		for (j = 0; j < 80; j++)
  			w[j] = j < 16 ? s[i + j] : rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1),
  			t = rol(m[0], 5) + f[j / 20 | 0]() + m[4] + w[j] + k[j / 20 | 0] | 0,
  			m[1] = rol(m[1], 30), m.pop(), m.unshift(t);
  		for (j = 0; j < 5; j++) m[j] = m[j] + o[j] | 0;
  	};
  	t = new DataView(new Uint32Array(m).buffer);
  	for (var i = 0; i < 5; i++) m[i] = t.getUint32(i << 2);
  
  	var hex = Array.prototype.map.call(new Uint8Array(new Uint32Array(m).buffer), function(e) {
  		return (e < 16 ? "0" : "") + e.toString(16);
  	}).join("");
  	return hex;
  }
  /**
   * @synopsis 签名算法 
   *
   * @param jsapi_ticket 用于签名的 jsapi_ticket
   * @param url 用于签名的 url ，注意必须动态获取，不能 hardcode
   *
   * @returns
   */
  var sign = function(jsapi_ticket, url) {
  	var ret = {
  		jsapi_ticket: jsapi_ticket,
  		nonceStr: createNonceStr(),
  		timestamp: createTimestamp(),
  		url: url
  	};
  	var str = raw(ret);
  	ret.signature = sha1(str);
  
  	return ret;
  };
  