Flask 6（反爬策略：数据加密、js动态加载）

比眉伴天荒 2023-10-08 12:03 39阅读 0赞

#### Flask 数据传输加密 ####

*   *  1、先创建一个库并添加、查询
     *  2、反爬策略：数据加密、js动态加载
     *   *  2.1、先把数据变成js加载
         *  2.2、对news\_content进行base64加密
         *  2.3、爬取看看能获取什么数据
         *  2.4、隐藏js
         *   *  2.4.1、番外：爬取这类加密的小技巧

### 1、先创建一个库并添加、查询 ###

建一个新的表  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70]  
视图  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 1]

@blue.route("/addnews/")
    def add_news():
        news = News()
        time = datetime.datetime.now()
        news.n_title = "今日全国新增892例"
        news.n_content = "截止今日（%s）全国确诊总人数75571" % time.date()
        db.session.add(news)
        db.session.commit()
    
        return "添加新闻成功"
    
    
    @blue.route("/getnews/")
    def get_news():
        news_list = News.query.all()
        return render_template("NewsList.html", news_list=news_list)

新建App/templates/NewsList.html

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    <h2>最新消息</h2>
    <ul>
        {% for news in news_list %}
            <li>{
       { news.n_title }}</li>
            <li>{
       { news.n_content }}</li>
        {% endfor %}
        
    </ul>
    </body>
    </html>

迁移

python manage.py db migrate
    python manage.py db upgrade

运行

python manage.py runserver -r -d

访问  
![在这里插入图片描述][20200221161719567.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 2]

### 2、反爬策略：数据加密、js动态加载 ###

#### 2.1、先把数据变成js加载 ####

新建news\_content.html  
把下图这部分代码移到news\_content.html中  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 4]

修改视图  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 5]  
修改NewsList.html  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 6]  
运行并访问  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 7]

#### 2.2、对news\_content进行base64加密 ####

视图  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 8]

@blue.route("/jiami/")
    def jiami():
        news_list = News.query.all()
        news_content = render_template("news_content.html", news_list=news_list)
    
        # decode("utf-8")的作用是将utf-8转换成unicode编码
        # encode("utf-8")的作用是将unicode编码转换成utf-8
    
        # 第一次加密
        encode_1 = base64.standard_b64encode(news_content.encode("utf-8")).decode("utf-8")
        # 添加混淆字符
        add_encode_1 = "ComeonWuhan" + encode_1 + "ComeonChina"
        # 第二次加密
        encode_2 = base64.standard_b64encode(add_encode_1.encode("utf-8")).decode("utf-8")
    
        return render_template("NewsList.html", news_content=news_content, encode_2=encode_2)

NewsList.html  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 9]  
新建static/js/base64\_decode.js 内容如下  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 10]

运行并访问  
访问之前先清空一下浏览器的缓存，每次有js更改的地方建议都清除一下缓存，不然有可能不能更新js。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 11]  
访问：这是成功经过base64加密并用字符串混淆后，再经过js解密过来的字符  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 12]

#### 2.3、爬取看看能获取什么数据 ####

写一个爬虫爬取试试

> 没有安装requests可以先安装一下  
> pip install requests

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 13]

import requests
    
    
    def get_html():
        respose = requests.get('http://127.0.0.1:5000/jiami/')
        print(respose.content.decode("utf-8"))
    
    
    if __name__ == "__main__":
        get_html()

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 14]  
爬取后，我们发现只能获取加密后的字符  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 15]  
虽然爬取不到直接的数据，但是我们的解密文件base64\_decode.js是能被人获取到的  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 16]

#### 2.4、隐藏js ####

写一个能获取js的路由  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 17]

@blue.route("/getjs/")
    def getjs():
        with open(os.path.join(BASE_DIR,"App/static/js/base64_decode.js"),"r", encoding='UTF-8') as file:
            js = file.read()
        return js

这里的os、BASE\_DIR两个导包注意一下  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 18]  
修改html  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 19]  
清空浏览器缓存  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 20]  
运行并访问试试  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 21]  
右击/getjs/  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 22]  
我们发现也能打开js  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 23]  
我们将js的加载也变成动态的  
修改html

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 24]

修改视图  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 25]

@blue.route("/getjs/")
    def getjs():
    
        t = request.args.get('t')
        c = time.time() * 1000
    
        try:
            t = int(t)
        except:
            return "别改了，改了也获取不了我的js"
    
        if c > t and c - t < 1000:
            with open(os.path.join(BASE_DIR, "App/static/js/base64_decode.js"), "r", encoding='UTF-8') as file:
                js = file.read()
                return js
        else:
            return "想抓取我js，没门"

运行并访问试试  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 26]  
获取js  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 27]  
![在这里插入图片描述][20200223001757799.png]  
![在这里插入图片描述][20200223001853573.png]  
用爬虫爬取试试  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 28]  
只能获取到加密后字符  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 29]

##### 2.4.1、番外：爬取这类加密的小技巧 #####

首先我们访问类网站是会看到js里面对应的解密方法  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 30]  
这里这个方法叫loop（）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 31]  
在控制台，输入loop  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 32]  
点进去就能看见js代码  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70 33]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200221155147593.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FfX2ludF9f,size_16,color_FFFFFF,t_70
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[20200221161719567.png]: https://img-blog.csdnimg.cn/20200221161719567.png
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