Python爬虫JS逆向案例教学，看看千元以上的外包都是怎么样的（附源码）

古城微笑少年丶 2022-09-11 14:21 83阅读 0赞

# 知识点： #

*  requests
 *  execjs

# 第三方库： #

*  requests >>> pip install requests
 *  execjs >>> pip install PyExecJS

# 开发环境： #

*  版 本：anaconda5.2.0（python3.6.5）
 *  编辑器：pycharm

【付费VIP完整版】只要看了就能学会的教程，80集Python基础入门视频教学

# [点这里即可免费在线观看][Link 1] #

# 分析，单首歌曲所在的链接、加密的规则 #

### 选定目标 ###

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5p2-6byg54ix5ZCD6aW85bmy_size_20_color_FFFFFF_t_70_g_se_x_16][]  
先点击动态加载，然后在点击播放按钮  
![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5p2-6byg54ix5ZCD6aW85bmy_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

先使用检索工具，复制歌曲ID，在检索工具里搜索，最后找到歌曲的数据包

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5p2-6byg54ix5ZCD6aW85bmy_size_20_color_FFFFFF_t_70_g_se_x_16 2]  
找到加密之后的数据，复制encSecKey到检索工具里查找

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5p2-6byg54ix5ZCD6aW85bmy_size_20_color_FFFFFF_t_70_g_se_x_16 3][]  
找到数据包后，右键点击Open in Sources panel

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5p2-6byg54ix5ZCD6aW85bmy_size_20_color_FFFFFF_t_70_g_se_x_16 4][]  
分析数据，复制代码  
![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBA5p2-6byg54ix5ZCD6aW85bmy_size_20_color_FFFFFF_t_70_g_se_x_16 5][]  
运行后得到加密参数  
![5dc4e8172eb64baca08647a896ab10ec.png][]

# 开始写代码 #

### 第一个解密 ###

import requests  # 发送网络请求
    import execjs  # 调用js代码的模块
    
        url = 'https://music.163.com/weapi/song/enhance/player/url/v1?csrf_token=f3cb47b2b44afb5c7d5b267cc60766cb'
        js = open('demo.js', 'r', encoding='utf-8').read()
        ctx = execjs.compile(js)
        # 调用js里面的函数 (第一个是函数名, 参数)
        result = ctx.call('start', song_id)
        data = { 
            'params': result['encText'],
            'encSecKey': result['encSecKey']
        }
        headers = { 
            'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36',
            # 用户信息标识
            'cookie': '_iuqxldmzr_=32; _ntes_nnid=ebf3d77c667fa506d26f9ddb18340c1a,1631792204854; _ntes_nuid=ebf3d77c667fa506d26f9ddb18340c1a; NMTID=00OR9oja7jRdVKsdkWjsSkzfpe6kDoAAAF77mUMdg; WNMCID=xzerkz.1631792205013.01.0; WEVNSM=1.0.0; WM_NI=vBQ2%2Bw17HytDYS1GI3g7DkT7VTr%2B4EXODB%2F33ynkt8Lb7U7Q8x8H6wR%2BOmpKo2yVbM5u9jad1RshFBs0VYnhDdMY6YnieHA%2FXZUX9B0lfGL7deJ0g5xFtC36hy1cLdVJUGs%3D; WM_NIKE=9ca17ae2e6ffcda170e2e6ee82b766aa92b998f05a92b88ab6c84a869f8a84f43af5edfbb0d769989aa7b0c22af0fea7c3b92ab69e9fd3aa7df3e9889af7509b8dffa8cc39a5e98c8cd73d968cbeccb74f9c918ca3ae39f1a7a28cf73490bef9b6b65bfca8f8a9b57d92f5818ef341adeeb7b7e147f7abf78be470f38ebd89c54ab1f09abaed6488bc83bab553aeb7aba9c4259c869bb9bc4af4b4aaa8cf3da8bb86d1e63fbc9abca4b23eaca7ff84cf7096969ba8f237e2a3; WM_TID=GAgBwBSskVpAURVAEAZ73v38OSZWFyaG; __csrf=f3cb47b2b44afb5c7d5b267cc60766cb; MUSIC_U=ef63db2826f2c58d750719abd63a4be1b03d88b788d670ba6fcb33633b202b19993166e004087dd3d78b6050a17a35e705925a4e6992f61dfe3f0151024f9e31; ntes_kaola_ad=1; JSESSIONID-WYYY=RkN1BuKQuGb4%5Csy%5CWRrXIDVpjajXMbdGrsnKDqT%5C9vS2wSxduz%2BcCS4ezpW0%5CCjs3zUBgSUyFA25V1qwv2nYxP%2BzmcKema2fyYpNfdnlpvbkAg%2FcC%2F8giulOPCM4kby5P1u4Xw%2BMXRViAaA4jxtFszXxwSK6MFddUGNo8%2B4dXnFm2NnJ%3A1631797886961; playerid=74269792'
        }

### 第二个解密 ###

js = open('demo.js', 'r', encoding='utf-8').read()
    ctx = execjs.compile(js)
    # 调用js里面的函数 (第一个是函数名, 参数)
    result = ctx.call('main', input('请输入你想要下载的歌曲名称/歌手名称:'))
    data = { 
        'params': result['encText'],
        'encSecKey': result['encSecKey']
    }
    headers = { 
        'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36',
        # 用户信息标识
        'cookie': '_iuqxldmzr_=32; _ntes_nnid=ebf3d77c667fa506d26f9ddb18340c1a,1631792204854; _ntes_nuid=ebf3d77c667fa506d26f9ddb18340c1a; NMTID=00OR9oja7jRdVKsdkWjsSkzfpe6kDoAAAF77mUMdg; WNMCID=xzerkz.1631792205013.01.0; WEVNSM=1.0.0; WM_NI=vBQ2%2Bw17HytDYS1GI3g7DkT7VTr%2B4EXODB%2F33ynkt8Lb7U7Q8x8H6wR%2BOmpKo2yVbM5u9jad1RshFBs0VYnhDdMY6YnieHA%2FXZUX9B0lfGL7deJ0g5xFtC36hy1cLdVJUGs%3D; WM_NIKE=9ca17ae2e6ffcda170e2e6ee82b766aa92b998f05a92b88ab6c84a869f8a84f43af5edfbb0d769989aa7b0c22af0fea7c3b92ab69e9fd3aa7df3e9889af7509b8dffa8cc39a5e98c8cd73d968cbeccb74f9c918ca3ae39f1a7a28cf73490bef9b6b65bfca8f8a9b57d92f5818ef341adeeb7b7e147f7abf78be470f38ebd89c54ab1f09abaed6488bc83bab553aeb7aba9c4259c869bb9bc4af4b4aaa8cf3da8bb86d1e63fbc9abca4b23eaca7ff84cf7096969ba8f237e2a3; WM_TID=GAgBwBSskVpAURVAEAZ73v38OSZWFyaG; __csrf=f3cb47b2b44afb5c7d5b267cc60766cb; MUSIC_U=ef63db2826f2c58d750719abd63a4be1b03d88b788d670ba6fcb33633b202b19993166e004087dd3d78b6050a17a35e705925a4e6992f61dfe3f0151024f9e31; ntes_kaola_ad=1; JSESSIONID-WYYY=RkN1BuKQuGb4%5Csy%5CWRrXIDVpjajXMbdGrsnKDqT%5C9vS2wSxduz%2BcCS4ezpW0%5CCjs3zUBgSUyFA25V1qwv2nYxP%2BzmcKema2fyYpNfdnlpvbkAg%2FcC%2F8giulOPCM4kby5P1u4Xw%2BMXRViAaA4jxtFszXxwSK6MFddUGNo8%2B4dXnFm2NnJ%3A1631797886961; playerid=74269792'
    }
    url = 'https://music.163.com/weapi/cloudsearch/get/web?csrf_token='

# 提取数据 #

songs = requests.post(url, data=data, headers=headers).json()['result']['songs']
    for song in songs:
        song_name = song['name']    # 歌曲名称
        song_id = song['id']        # 歌曲id
        singer_name = song['ar'][0]['name'] # 歌手名称

# 拿到每一首歌的url地址 #

mp3_url = requests.post(url, data=data, headers=headers).json()['data'][0]['url']

# 依次请求 歌曲 url #

# 音频 图片 视频 二进制数据
    mp3_data = requests.get(mp3_url, headers=headers).content

# 保存数据 #

with open(f'mp3/{ song_name}-{ singer_name}.mp3', mode='wb') as f:
        f.write(mp3_data)
    print(f'{ song_name}-{ singer_name}爬取成功!!!')

# 完整代码 #

import requests  # 发送网络请求
    import execjs  # 调用js代码的模块
    
    
    js = open('demo.js', 'r', encoding='utf-8').read()
    ctx = execjs.compile(js)
    # 调用js里面的函数 (第一个是函数名, 参数)
    result = ctx.call('main', input('请输入你想要下载的歌曲名称/歌手名称:'))
    data = { 
        'params': result['encText'],
        'encSecKey': result['encSecKey']
    }
    headers = { 
        'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36',
        # 用户信息标识
        'cookie': '_iuqxldmzr_=32; _ntes_nnid=ebf3d77c667fa506d26f9ddb18340c1a,1631792204854; _ntes_nuid=ebf3d77c667fa506d26f9ddb18340c1a; NMTID=00OR9oja7jRdVKsdkWjsSkzfpe6kDoAAAF77mUMdg; WNMCID=xzerkz.1631792205013.01.0; WEVNSM=1.0.0; WM_NI=vBQ2%2Bw17HytDYS1GI3g7DkT7VTr%2B4EXODB%2F33ynkt8Lb7U7Q8x8H6wR%2BOmpKo2yVbM5u9jad1RshFBs0VYnhDdMY6YnieHA%2FXZUX9B0lfGL7deJ0g5xFtC36hy1cLdVJUGs%3D; WM_NIKE=9ca17ae2e6ffcda170e2e6ee82b766aa92b998f05a92b88ab6c84a869f8a84f43af5edfbb0d769989aa7b0c22af0fea7c3b92ab69e9fd3aa7df3e9889af7509b8dffa8cc39a5e98c8cd73d968cbeccb74f9c918ca3ae39f1a7a28cf73490bef9b6b65bfca8f8a9b57d92f5818ef341adeeb7b7e147f7abf78be470f38ebd89c54ab1f09abaed6488bc83bab553aeb7aba9c4259c869bb9bc4af4b4aaa8cf3da8bb86d1e63fbc9abca4b23eaca7ff84cf7096969ba8f237e2a3; WM_TID=GAgBwBSskVpAURVAEAZ73v38OSZWFyaG; __csrf=f3cb47b2b44afb5c7d5b267cc60766cb; MUSIC_U=ef63db2826f2c58d750719abd63a4be1b03d88b788d670ba6fcb33633b202b19993166e004087dd3d78b6050a17a35e705925a4e6992f61dfe3f0151024f9e31; ntes_kaola_ad=1; JSESSIONID-WYYY=RkN1BuKQuGb4%5Csy%5CWRrXIDVpjajXMbdGrsnKDqT%5C9vS2wSxduz%2BcCS4ezpW0%5CCjs3zUBgSUyFA25V1qwv2nYxP%2BzmcKema2fyYpNfdnlpvbkAg%2FcC%2F8giulOPCM4kby5P1u4Xw%2BMXRViAaA4jxtFszXxwSK6MFddUGNo8%2B4dXnFm2NnJ%3A1631797886961; playerid=74269792'
    }
    url = 'https://music.163.com/weapi/cloudsearch/get/web?csrf_token='
    songs = requests.post(url, data=data, headers=headers).json()['result']['songs']
    for song in songs:
        song_name = song['name']    # 歌曲名称
        song_id = song['id']        # 歌曲id
        singer_name = song['ar'][0]['name'] # 歌手名称
    
        url = 'https://music.163.com/weapi/song/enhance/player/url/v1?csrf_token=f3cb47b2b44afb5c7d5b267cc60766cb'
        js = open('demo.js', 'r', encoding='utf-8').read()
        ctx = execjs.compile(js)
        # 调用js里面的函数 (第一个是函数名, 参数)
        result = ctx.call('start', song_id)
        data = { 
            'params': result['encText'],
            'encSecKey': result['encSecKey']
        }
        headers = { 
            'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36',
            # 用户信息标识
            'cookie': '_iuqxldmzr_=32; _ntes_nnid=ebf3d77c667fa506d26f9ddb18340c1a,1631792204854; _ntes_nuid=ebf3d77c667fa506d26f9ddb18340c1a; NMTID=00OR9oja7jRdVKsdkWjsSkzfpe6kDoAAAF77mUMdg; WNMCID=xzerkz.1631792205013.01.0; WEVNSM=1.0.0; WM_NI=vBQ2%2Bw17HytDYS1GI3g7DkT7VTr%2B4EXODB%2F33ynkt8Lb7U7Q8x8H6wR%2BOmpKo2yVbM5u9jad1RshFBs0VYnhDdMY6YnieHA%2FXZUX9B0lfGL7deJ0g5xFtC36hy1cLdVJUGs%3D; WM_NIKE=9ca17ae2e6ffcda170e2e6ee82b766aa92b998f05a92b88ab6c84a869f8a84f43af5edfbb0d769989aa7b0c22af0fea7c3b92ab69e9fd3aa7df3e9889af7509b8dffa8cc39a5e98c8cd73d968cbeccb74f9c918ca3ae39f1a7a28cf73490bef9b6b65bfca8f8a9b57d92f5818ef341adeeb7b7e147f7abf78be470f38ebd89c54ab1f09abaed6488bc83bab553aeb7aba9c4259c869bb9bc4af4b4aaa8cf3da8bb86d1e63fbc9abca4b23eaca7ff84cf7096969ba8f237e2a3; WM_TID=GAgBwBSskVpAURVAEAZ73v38OSZWFyaG; __csrf=f3cb47b2b44afb5c7d5b267cc60766cb; MUSIC_U=ef63db2826f2c58d750719abd63a4be1b03d88b788d670ba6fcb33633b202b19993166e004087dd3d78b6050a17a35e705925a4e6992f61dfe3f0151024f9e31; ntes_kaola_ad=1; JSESSIONID-WYYY=RkN1BuKQuGb4%5Csy%5CWRrXIDVpjajXMbdGrsnKDqT%5C9vS2wSxduz%2BcCS4ezpW0%5CCjs3zUBgSUyFA25V1qwv2nYxP%2BzmcKema2fyYpNfdnlpvbkAg%2FcC%2F8giulOPCM4kby5P1u4Xw%2BMXRViAaA4jxtFszXxwSK6MFddUGNo8%2B4dXnFm2NnJ%3A1631797886961; playerid=74269792'
        }
        # 如果你买了这首歌 有这首歌的权限 那么就可以下载
        # 拿到每一首歌的url地址
        mp3_url = requests.post(url, data=data, headers=headers).json()['data'][0]['url']
        # 依次请求 歌曲 url
        # .content: 拿到网页当中的 二进制数据
        # 音频 图片 视频 二进制数据
        mp3_data = requests.get(mp3_url, headers=headers).content
        # 保存
        with open(f'mp3/{ song_name}-{ singer_name}.mp3', mode='wb') as f:
            f.write(mp3_data)
        print(f'{ song_name}-{ singer_name}爬取成功!!!')

# [对于本篇文章有疑问的同学也可以点这里][Link 2] #

[Link 1]: https://www.bilibili.com/video/BV1544y1C7g4?share_source=copy_web
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[5dc4e8172eb64baca08647a896ab10ec.png]: /images/20220828/52665fb293e348c4bc44bcca2a54c00a.png
[Link 2]: https://link.csdn.net/?target=https%3A%2F%2Fjq.qq.com%2F%3F_wv%3D1027%26k%3DSuR89RD4