回复5上传临时图片报错

对Promise不懂,不知道怎么检查

"use strict"
var Promise = require("bluebird")
// 对request进行promise化(可以使用then)
var request = Promise.promisify(require("request"))
var util = require("./util")
var fs = require("fs")

var prefix = "https://api.weixin.qq.com/cgi-bin/"
var api = {
    //access_token获取地址
    accessToken: prefix + "token?grant_type=client_credential",
    upload: "media/upload?"
}

function Wechat(opts) {
    // 将appjs里的config配置赋值给自身
    var that = this
    this.appID = opts.appID
    this.appSecret = opts.appSecret
    this.getAccessToken = opts.getAccessToken
    this.saveAccessToken = opts.saveAccessToken

    this.fetchAccessToken()
}

// 判断access_token是否可用
Wechat.prototype.isValidAccessToken = function (data) {
    // access_token是否合法
    if (!data || !data.access_token || data.expires_in) {
        return false
    }

    var access_token = data.access_token
    var expires_in = data.expires_in
    var now = (new Date().getTime())

    if (now < expires_in) {
        // 有效期内
        return ture
    }
    else {
        return false
    }
}

// 更新access_token
Wechat.prototype.updateAccessToken = function () {
    var appID = this.appID
    var appSecret = this.appSecret
    var url = api.accessToken + "&appid=" + appID + "&secret=" + appSecret
    // 发送get请求,本身是没有then的,我们用Promise进行了封装

    return new Promise(function(resolve, reject){
        request({url :url, json: true}).then(function(response) {
            var data = response[1]
            var now = (new Date().getTime())
            // 提前20秒刷新,考虑网络延迟
            var expires_in = now + (data.expires_in - 20) * 1000

            data.expires_in = expires_in
            resolve(data)
        })
    })
}

// 获取access_token
Wechat.prototype.fetchAccessToken = function (data) {
    var that = this
    if (this.access_token && this.expires_in){
        if (this.isValidAccessToken(this)){
            return Promise.resolve(this)
        }
    }
    this.getAccessToken()
        .then(function(data) {
            try {
                data = JSON.parse(data)
            }
            catch(e) {
                return that.updateAccessToken()
            }
            // 拿到票据后依然判断是否有效
            if (that.isValidAccessToken(data)){
                return Promise.resolve(data)
            }
            else {
                return that.updateAccessToken()
            }
        })
        .then(function (data) {
            that.access_token = data.access_token
            that.expires_in = data.expires_in
            // 将票据写入文件中
            that.saveAccessToken(data)
            return Promise.resolve(data)
        })
}

// 新增临时素材
Wechat.prototype.uploadMaterial = function (type, filepath) {
    var that = this
    var form = {
        media: fs.createReadStream(filepath)
    }

    // 发送get请求,本身是没有then的,我们用Promise进行了封装
    return new Promise(function(resolve, reject){

        that
            .fetchAccessToken()
            .then(function(data) {
                var url = prefix + api.upload + "&access_token=" + data.access_token + "&type=" + type
                request({method: "POST", url :url, formData: form, json: true})
                .then(function(response) {
                    var _data = response[1]
                    if (_data) {
                        resolve(_data)
                    }
                    else  {
                        throw new Error("upload material fails")
                    }
                })
                .catch(function (err) {
                    reject(err)
                })
            })
    })
}

Wechat.prototype.reply = function() {
    // 上下文已经改变,可以拿到this的变量
    var content = this.body
    //console.log("content内容是::" + this.body)
    var message = this.weixin
    var xml = util.tpl(content, message)

    this.status = 200
    this.type = "application/xml"
    this.body = xml
}

module.exports = Wechat