知识点

• 动态数据抓包
• 动态页面分析
• requests携带参数发送请求
• json数据解析

开发环境

• python 3.8 更加新 稳定 运行代码
• pycharm 2021.2 辅助敲代码
• requests 第三方模块

一. 数据来源分析(思路分析)

1. 打开一个作者视频页面

2. 打开开发者工具刷新网页

• 右键点击检查 或者 F12 打开

• 选择network 然后刷新网页

  
  

• 随便点击打开一个视频

  
  [图片上传中...(QQ截图20220115163614.jpg-5299b0-1642235785075-0)]

• 点击搜到的内容

  
  
• 依次展开查看, 去找到我们需要的视频地址

4. 确定url地址, 请求方式, 请求参数, 请求头参数

• 请求头参数

  
  

• 请求参数

  
  

5. 总结

• 请求方式: POST
• 请求头(伪装):

headers = {
'content-type': 'application/json',
'Cookie': '你自己的cookie',
'Host': 'www.kuaishou.com',
'Origin': 'https://www.kuaishou.com',
'Referer': 'https://www.kuaishou.com/profile/3xv78fxycm35nn4',
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
(KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36'
}

• 请求参数:

data = {
'operationName': "visionProfilePhotoList",
'query': "query visionProfilePhotoList($pcursor: String, $userId: String, $page:
String, $webPageArea: String) {\n visionProfilePhotoList(pcursor: $pcursor, userId:
$userId, page: $page, webPageArea: $webPageArea) {\n result\n llsid\n
webPageArea\n feeds {\n type\n author {\n id\n name\n
following\n headerUrl\n headerUrls {\n cdn\n url\n
__typename\n }\n __typename\n }\n tags {\n type\n
name\n __typename\n }\n photo {\n id\n
duration\n caption\n likeCount\n realLikeCount\n
coverUrl\n coverUrls {\n cdn\n url\n __typename\n
}\n photoUrls {\n cdn\n url\n __typename\n
}\n photoUrl\n liked\n timestamp\n expTag\n
animatedCoverUrl\n stereoType\n videoRatio\n
profileUserTopPhoto\n __typename\n }\n canAddComment\n
currentPcursor\n llsid\n status\n __typename\n }\n hostName\n
pcursor\n __typename\n }\n}\n",
'variables': {'userId': "3x9dquvtb9n9fps", 'pcursor': "", 'page': "profile"}
}

• 后续如果需要翻页爬取, 需要使用递归实现

  
  

二. 代码实现

1. 发送请求 访问网站

url = 'https://www.kuaishou.com/graphql'
# 伪装
headers = {
    # 控制data类型 json类型字符串
    'content-type': 'application/json',
    'Cookie': 'kpf=PC_WEB; kpn=KUAISHOU_VISION; clientid=3; did=web_ea128125517a46bd491ae9ccb255e242; client_key=65890b29; userId=270932146; kuaishou.server.web_st=ChZrdWFpc2hvdS5zZXJ2ZXIud2ViLnN0EqABnjkpJPZ-QanEQnI0XWMVZxXtIqPj-hwjsXBn9DHaTzispQcLjGR-5Xr-rY4VFaIC-egxv508oQoRYdgafhxSBpZYqLnApsaeuAaoLj2xMbRoytYGCrTLF6vVWJvzz3nzBVzNSyrXyhz-RTlRJP4xe1VjSp7XLNLRnVFVEtGPuBz0xkOnemy7-1-k6FEwoPIbOau9qgO5mukNg0qQ2NLz_xoSKS0sDuL1vMmNDXbwL4KX-qDmIiCWJ_fVUQoL5jjg3553H5iUdvpNxx97u6I6MkKEzwOaSigFMAE; kuaishou.server.web_ph=b282f9af819333f3d13e9c45765ed62560a1',
    'Host': 'www.kuaishou.com',
    'Origin': 'https://www.kuaishou.com',
    'Referer': 'https://www.kuaishou.com/profile/3xauthkq46ftgkg',
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36',
}
# <Response [200]>: 发送请求成功结果
response = requests.post(url=url, headers=headers, json=data)

2. 获取数据

json_data = response.json()

3. 解析数据 去除不想要的内容

feeds = json_data['data']['visionProfilePhotoList']['feeds']
# 下一页需要的参数
pcursor = json_data['data']['visionProfilePhotoList']['pcursor']
# print(pcursor)
for feed in feeds:
    caption = feed['photo']['caption']    # 标题
    photoUrl = feed['photo']['photoUrl']   # 视频链接
    # \: 转义字符, 直接写\ 匹配不到 \
    # \\ 才能匹配到 \
    # 用css和xpath 是必须要你拿到的数据是一个网页源代码
    caption = re.sub('[\\/:*?"<>|\n\t]', '', caption)
    print(caption, photoUrl)

5. 获取数据 视频数据 拿到的是视频二进制数据

video_data = requests.get(url=photoUrl).content

6. 保存视频 通过二进制的方式保存

with open(f'video/{caption}.mp4', mode='wb') as f:
    f.write(video_data)
print(caption, '下载完成!')

翻页爬取

def get_page(pcursor):
    # 需要的数据得指定好
    # 递归, 自己调用自己 跳出递归
    data = {
        'operationName': "visionProfilePhotoList",
        'query': "query visionProfilePhotoList($pcursor: String, $userId: String, $page: String, $webPageArea: String) {\n  visionProfilePhotoList(pcursor: $pcursor, userId: $userId, page: $page, webPageArea: $webPageArea) {\n    result\n    llsid\n    webPageArea\n    feeds {\n      type\n      author {\n        id\n        name\n        following\n        headerUrl\n        headerUrls {\n          cdn\n          url\n          __typename\n        }\n        __typename\n      }\n      tags {\n        type\n        name\n        __typename\n      }\n      photo {\n        id\n        duration\n        caption\n        likeCount\n        realLikeCount\n        coverUrl\n        coverUrls {\n          cdn\n          url\n          __typename\n        }\n        photoUrls {\n          cdn\n          url\n          __typename\n        }\n        photoUrl\n        liked\n        timestamp\n        expTag\n        animatedCoverUrl\n        stereoType\n        videoRatio\n        profileUserTopPhoto\n        __typename\n      }\n      canAddComment\n      currentPcursor\n      llsid\n      status\n      __typename\n    }\n    hostName\n    pcursor\n    __typename\n  }\n}\n",
        'variables': {'userId': "3xauthkq46ftgkg", 'pcursor': pcursor, 'page': "profile"}
    }
    if pcursor == None:
        print('全部下载完成')
        return 0
    
    get_page(pcursor)

get_page('')

效果展示