大家好，我是辣条。
现在短视频可谓是一骑绝尘，吃饭的时候、休息的时候、躺在床上都在刷短视频，今天给大家带来python爬虫进阶 ：美拍视频地址加密解析。
短视频js逆向解析
抓取目标
工具使用
开发环境：win10、python3.7
开发工具：pycharm、Chrome
工具包：requests、xpath、base64
重点学习内容
爬虫采集数据的解析过程
js代码调试技巧
js逆向解析代码
Python代码的转换
项目思路解析
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# eplace()方法用于在字符串中用一些字符替换另一些字符# parseInt 数据转换成对应的整型# base64.atob 对base64编码过的字符串进行解码# substring 方法可在字符串中抽取从 start 下标开始的指定数目的字符
将js代码转换成Python代码
import base64def decode(data):def getHex(a):return {'str': a[4:],'hex': ''.join(list(a[:4])[::-1]),}def getDec(a):b = str(int(a, 16))return {'pre': list(b[:2]),'tail': list(b[2:]),}def substr(a, b):c = a[0: int(b[0])]d = a[int(b[0]): int(b[0]) + int(b[1])]return c + a[int(b[0]):].replace(d, "")def getPos(a, b):b[0] = len(a) - int(b[0]) - int(b[1])return bb = getHex(data)c = getDec(b['hex'])d = substr(b['str'], c['pre'])return base64.b64decode(substr(d, getPos(d, c['tail'])))print(decode("e121Ly9tBrI84RdnZpZGVvMTAubWVpdHVkYXRhLmNvbS82MGJjZDcwNTE3NGZieXBueG5udnRwMTA5N19IMjY0XzFfNWY3YThmM2U0MTEwNy5tc2JVjAu3EDQ="))
简易源码分享
import requestsfrom lxml import etreeimport base64def decode_mp4(data):def getHex(a):return {'str': a[4:],'hex': ''.join(list(a[:4])[::-1]),}def getDec(a):b = str(int(a, 16))return {'pre': list(b[:2]),'tail': list(b[2:]),}def substr(a, b):c = a[0: int(b[0])]d = a[int(b[0]): int(b[0]) + int(b[1])]return c + a[int(b[0]):].replace(d, "")def getPos(a, b):b[0] = len(a) - int(b[0]) - int(b[1])return bb = getHex(data)c = getDec(b['hex'])d = substr(b['str'], c['pre'])return base64.b64decode(substr(d, getPos(d, c['tail'])))# 运行主函数def main():url = 'https://www.meipai.com'headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36',}response = requests.get(url=url, headers=headers)html_data = etree.HTML(response.text)href_list = html_data.xpath('//div/a/@href')# print(href_list)for href in href_list:res = requests.get('https://www.meipai.com' + href, headers=headers)html = etree.HTML(res.text)name = html.xpath('//div[@id="detailVideo"]/img/@alt')[0]mp4_data = html.xpath('//div[@id="detailVideo"]/@data-video')[0]# print(name, mp4_data)mp4_url = decode_mp4(mp4_data).decode('utf-8')print(mp4_url)result = requests.get("http:" + mp4_url)with open(name + ".mp4", 'wb') as f:f.write(result.content)f.close()if __name__ == '__main__':main()
