import crypto from 'crypto-js';
import { encode, decode } from './base64.js';
import moment from 'moment'
// 计算签名。
function computeSignature(accessKeySecret, canonicalString) {
  return crypto.enc.Base64.stringify(crypto.HmacSHA1(canonicalString, accessKeySecret));
}
function getPolicy(){
	const date = new Date();
	date.setHours(date.getHours() + 1);
	const policyText = {
	  expiration: date.toISOString(), // 设置policy过期时间。
	  conditions: [
	    // 限制上传大小。
	    ["content-length-range", 0, 1024 * 1024 * 1024],
	  ],
	};
	return policyText;
}
function getKey(i,ext){
	let now=new Date();
	let date=moment(now).format('yyyyMMDD');
	let time=moment(now).format('HHmmss');
	let longTime=moment(now).format('yyyyMMDDHHmmss');
	let userId=JSON.parse(uni.getStorageSync('user')).id;
	return `${date}/${userId}/${time}/${longTime}${i}.${ext}`
}
module.exports={
	computeSignature,
	getPolicy,
	getKey
}