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）

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

点这里即可免费在线观看

分析，单首歌曲所在的链接、加密的规则

选定目标

先点击动态加载，然后在点击播放按钮

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

找到加密之后的数据，复制encSecKey到检索工具里查找

找到数据包后，右键点击Open in Sources panel

分析数据，复制代码

运行后得到加密参数

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idsinger_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idsinger_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