高教书苑的正确打开方式

糊涂涂 2022-9-6 445 9/6

免责声明

请遵守相关法律法规,本教程及脚本仅作研究分享,所有下载的PDF文件请在24小时内删除,切勿传播,所有法律责任由使用者自行承担,与本人无关!!!

缘由

成都疫情迫使我只能呆在家里上网课,因为没有返校所以也没有教材可用,于是我寻思着在网上找本电子书,这样还可以在我的ipad上做笔记(画画),太完美了!于是我打开了我的搜索引擎:

电子技术基础数字部分高等教育出版社第七版

好家伙,啥也搜不到,全是购书链接。 又不是没书,上学期在学长那里嫖到一本可惜被我放在寝室了,何必再买一本。于是我想到了高教书苑(https://ebook.hep.com.cn/ebooks/index.html#/),这上面有高等教育出版社出版的书的电子版可以在线阅读,我寻思着去碰碰运气。还真有!

初次尝试

我满心欢喜地打开它,直接开始操作:打印!可是弹出的打印框让我很失望:只有一页。怪不得网上没有电子版呢,这能难倒我吗?

查看源代码:

高教书苑的正确打开方式

干干净净,啥也没有,那就F12抓个包看看:

高教书苑的正确打开方式

这不就是好东西嘛,一看这整整齐齐的链接,刚刚好和页数一模一样,搞定!

原理

你想多了,点开链接,显示pdf格式错误,回来看看这个js文件,这么大一个KEY摆在这里,明显是加密的,经过一些特殊的技术方法我查到这是对pdf文件使用了AES加密,而这个密钥又采用了RSA加密,我们需要拿到RSA的私钥才能解密出真正的AES KEY,这里有两种方法:

  1. 1.逆向js找出前端是怎样生成RSA私钥的;
  2. 2.在前端用RSA私钥解密AES Key去渲染PDF的前一行源代码插入下载私钥的源代码

嗯,看起来就是无比万分复杂的样子。。。第一个难度太大不予考虑,第二个在这里不赘述了,因为作者还没完全实现,以后再来填坑。你是不是觉得我说了一堆废话?那下面就是干货了!

终极方法

首先我想到了一般这种网站肯定是有手机端的,而手机端一般会相对简单一些,所以我尝试进入手机端页面(https://ebook.hep.com.cn/ebooks/h5/index.html#/),相同方法找到authorize文件,奇妙的事情发生了:

高教书苑的正确打开方式

看上去一模一样是吧?但是这次链接变成了jpg文件了,有区别吗?区别就是打开链接你可以看见一张高清大图而不是“格式错误”,这已经前进了一大步了呢。

获取链接

为了方便我们直接把所有的jpg链接复制到url.txt文件中,由于格式本来就很整齐,我们直接用txt的替换功能清洗一下,把空格、"、,都去掉,只剩下链接:

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下载图片

接下来我们用python去挨个下载就好(这里最好下载的时候加个sleep,或者分两到三次下载,每次几十张就好,不要一次性下完,我已经被封了两个号了!!):


回来填个坑,分批次下载不会有事~


 

import platform
import requests
import sys

result = []
with open('url.txt', 'r') as f:  # url.txt文件与脚本放在相同目录下
    for line in f:
        result.append(list(line.strip('\n').split(',')))

for i in range(0, len(result)):
    url = ''
    url = url.join(result[i])  # 依次代入图片链接
    r = requests.get(url)
    with open("pdf/" + str(i) + ".jpeg", "wb") as f:  # 依次把图片储存在同目录下pdf文件夹中
        f.write(r.content)

合成pdf文件

下载好的图片已经保存在pdf文件夹中了,接下来用python自带的库来合成pdf文件:

import os
from fpdf import FPDF

pdf = FPDF()
pdf.set_auto_page_break(0)  # 自动分页设为False

path = r""  # 在这里填入储存图片的pdf文件夹的绝对路径
imagelist = [i for i in os.listdir(path)]

for image in sorted(imagelist):
    pdf.add_page()
    pdf.image(os.path.join(path, image), x=-10, w=216.5, h=302)  # 指定宽高

pdf.output(os.path.join(path, "1.pdf"), "F")

现在pdf文件已经生成在pdf文件夹中了,大功告成!

小记

其实这种方式有取巧的嫌疑,没有什么技术手段,但是高清图片生成的pdf文件虽然比不上解密出来的原始pdf,也还是勉强够用了。

- THE END -

糊涂涂

9月09日11:55

最后修改:2022年9月9日
5

非特殊说明,本博所有文章均为博主原创。

共有 8 条评论

  1. hututu博主

    😃

  2. 666

    666*666

  3. pdf

  4. tyhty

    🌝🌝🌚🌚

  5. 蒟蒻

    🐮

  6. PoisonedDog

    6*1mol

  7. 。。。

    666

  8. hututu博主

    😍

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