Used to record WKU's utility bills on a regular basis.

Overview

WKU水电费小助手

一个用于定期记录WKU水电费的脚本

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背景

由于WKU校园内的水电账单系统时常存在扣费延迟的现象,而补扣的费用缺乏令人信服的证明。不少学生为费用摸不着头脑,但也没有申诉的依据。为了更好地掌握水电费使用情况,留下一手证据,我开源了这个自动化脚本。配合定时任务,它可以根据设定的时间间隔,自动查询当前的剩余的水电费情况,并形成记录。

安装以及部署

步骤#1: 捕获必要的验证信息

在获取水电费数据过程中,Cookie是通过身份认证的必要元素。为了抓取用于认证的数据包,我从微信公众号 ”温州肯恩大学校园卡 “下的“一卡通充值”服务入手。

提示:在本篇教程中,我使用Fiddler作为抓包工具。

步骤#1.1: 启用对HTTPS流量的捕获功能

由于我们获取Cookie所需的参数是通过HTTPS通信的,所以我们必须确保在开始之前,抓包软件已经启用了这个功能。

fiddler_https

步骤#1.2: 抓取微信公众号下H5网页的HTTPS请求

在抓包软件开始正常抓包后,我们打开微信公众号 ”温州肯恩大学校园卡 “并依次点击 "校园服务"、"一卡通充值"、"缴水费"。

步骤#1.3: 获得验证数据

最后一步! 我们从抓包软件中找到请求头为 "POST /app/login/getThirdUserAuthorize HTTP/1.1"的请求。在文本视图中复制ymTokenymUserId备用。

fiddler_data

提示:如果文本包含特殊符号,你需要将其转换为ASCII码。例如,"="需要转换为"%3D"。

步骤#2:安装Python脚本的依赖包

这个项目使用了Python3以及相关的依赖包,请确保你已经安装了它们。

pip install -r requirements.txt

步骤#3: 获取你寝室的areaCode

步骤#3.1: 填入验证数据

还记得我们在第一步获取的ymTokenymUserId嘛?将它们复制到我所提供的两个脚本中。

example_ym

步骤#3.2: 执行firstRun.py

在firstRun脚本中,你需要按照提示依次选择所属楼栋、所在楼层以及寝室号。

python firstRun.py

Step#3.3: 获取areaCode

复制脚本提供的areaCode,以便之后部署水电费记录机器人。

example_firstRun

提示:如果显示的水电费与微信公众号不一样,请通过问题板块告诉我(或者见面告诉我)

第4步:部署水电费记录机器人

步骤#4.1: 执行logRobot.py

python logRobot.py "your_area_code"

example_logRobot

提示:areaCode参数需要用引号括起来,否则记录机器人会报错。

执行后,在当前目录下会产生一个以areaCode为名称的txt文件。时间和对应的水电费会被记录在其中。

example_logFile

步骤#4.2: 将机器人部署在你想要部署的地方

该脚本目前部署在我的私人NAS上,并通过crontab定期进行记录。下面是我设置的crontab任务。

0 */4 * * * cd /data/fee && /usr/bin/python3 logRobot.py [areaCode]

拓展

这个脚本在轻量改写后可以在钉钉中实现缴费预警的功能。代码会在以后公布(可能会吧 老鸽子了orz)

example_dingReport

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