Python爬蟲JS逆向案例教學，看看千元以上的外包都是怎么樣的（附源碼）

本文轉載自查看原文 2021-09-17 16:43 302 Python案例教學

知識點：

requests
execjs

第三方庫：

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

開發環境：

版本：anaconda5.2.0（python3.6.5）
編輯器：pycharm

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分析，單首歌曲所在的鏈接、加密的規則

選定目標

先點擊動態加載，然后在點擊播放按鈕

先使用檢索工具，復制歌曲ID，在檢索工具里搜索，最后找到歌曲的數據包

在這里插入圖片描述

找到加密之后的數據，復制encSecKey到檢索工具里查找

找到數據包后，右鍵點擊Open in Sources panel

分析數據，復制代碼

運行后得到加密參數

開始寫代碼

第一個解密

import requests  # 發送網絡請求
import execjs  # 調用js代碼的模塊

    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)
    # 調用js里面的函數 (第一個是函數名, 參數)
    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',
        # 用戶信息標識
        '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'
    }

第二個解密

js = open('demo.js', 'r', encoding='utf-8').read()
ctx = execjs.compile(js)
# 調用js里面的函數 (第一個是函數名, 參數)
result = ctx.call('main', input('請輸入你想要下載的歌曲名稱/歌手名稱:'))
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',
    # 用戶信息標識
    '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='

提取數據

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

拿到每一首歌的url地址

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

依次請求歌曲 url

# 音頻 圖片 視頻  二進制數據
mp3_data = requests.get(mp3_url, headers=headers).content

保存數據

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!!!')

完整代碼

import requests  # 發送網絡請求
import execjs  # 調用js代碼的模塊


js = open('demo.js', 'r', encoding='utf-8').read()
ctx = execjs.compile(js)
# 調用js里面的函數 (第一個是函數名, 參數)
result = ctx.call('main', input('請輸入你想要下載的歌曲名稱/歌手名稱:'))
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',
    # 用戶信息標識
    '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']    # 歌曲名稱
    song_id = song['id']        # 歌曲id
    singer_name = song['ar'][0]['name'] # 歌手名稱

    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)
    # 調用js里面的函數 (第一個是函數名, 參數)
    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',
        # 用戶信息標識
        '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'
    }
    # 如果你買了這首歌 有這首歌的權限 那么就可以下載
    # 拿到每一首歌的url地址
    mp3_url = requests.post(url, data=data, headers=headers).json()['data'][0]['url']
    # 依次請求 歌曲 url
    # .content: 拿到網頁當中的 二進制數據
    # 音頻 圖片 視頻  二進制數據
    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!!!')

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