'use strict';

const Controller = require('egg').Controller;
const moment = require("moment");
const crypto = require("crypto");

const HOST = "https://infish-oss.oss-cn-beijing.aliyuncs.com";

class AliOssController extends Controller {

  async policy() {
        const { ctx } = this;
        let dir = ctx.request.query.dir;
        let time = moment(Date.now() + 30000).format("YYYY-MM-DDTHH:mm:ss.SSS") + "Z";
            
            let policyObj = JSON.stringify({
                "expiration": time,
                "conditions": [
                    ["content-length-range", 0, 1048576000],
                    ["starts-with", "$key", dir]
                ]
            })
            let policy = new Buffer(policyObj).toString('base64');
            let signature = crypto.createHmac('sha1', 'AHubozYEzXzi4fBL0ttLJ5sN1HMKA6').update(policy).digest().toString('base64');
            ctx.resultOK(
                {
                    accessid: 'LTAI4GHqGdgY3b14jVRTzL2w',
                    host:HOST,
                    dir,
                    policy,
                    expire:time,
                    signature
                }
            );
    }
}

module.exports = AliOssController;