中文编程抖音去水印思路解析-借鸡生蛋

随着5G的来临，未来必然是短视频的天下，公司最近想分拆商乾成立一个专门的日韩时尚搭配视频，影视解说的视频网站，目前应该最火的就是抖音了。于是找了好几家抖音去水印视频下载软件。

经测试确实是可以下载到去水印的抖音视频，本着追根究底的态度，决定研究一下，对方软件到底是通过第三方接口解析还是直接抖音的接口来去水印的。

打开抓包工具（https debugger）一探究竟。
随便整一个抖音分享链接：

去掉其他不需要的程序

发现4个访问链接，类型均为GET
链接1：https://v.douyin.com/JdXubs8/
request请求头信息：

1. GET /JdXubs8/ HTTP/1.1
   
2. Connection: Keep-Alive
   
3. Accept: */*
   
4. Accept-Language: zh-cn
   
5. Referer: https://v.douyin.com/JdXubs8/
   
6. User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1
   
7. Host: v.douyin.com
   
8. 
   

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response返回数据分析：

1. <a href="https://www.iesdouyin.com/share/video/6835237313107299599/?region=CN&mid=6835237325144984328&u_code=g401eh52&titleType=title&utm_source=copy_link&utm_campaign=client_share&utm_medium=android&app=aweme">Found</a>.
   

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返回头部信息

1. HTTP/1.1 302 Found
   
2. Server: Tengine
   
3. Content-Type: text/html; charset=utf-8
   
4. Connection: keep-alive
   
5. Date: Sat, 11 Jul 2020 08:16:12 GMT
   
6. location: https://www.iesdouyin.com/share/video/6835237313107299599/?region=CN&mid=6835237325144984328&u_code=g401eh52&titleType=title&utm_source=copy_link&utm_campaign=client_share&utm_medium=android&app=aweme
   
7. x-tt-logid: 2020071116161201001106010301076D0B
   
8. server-timing: inner; dur=0
   
9. x-tt-trace-host: 018bfdf19a3fe81db742c777826847ae75d8eb3eab040f0ef8291e92a9649e8fa35441c483a76b8c877705a974373dc0289516f2493ad3c1b9a1e1d3e3e33baed4e72c8ffb737f540241a669cd388b9064
   
10. x-tt-trace-tag: id=03;cdn-cache=miss;type=dyn
    
11. server-timing: cdn-cache;desc=MISS,edge;dur=0,origin;dur=43
    
12. Via: cache5.cn2005[43,0]
    
13. Timing-Allow-Origin: *
    
14. EagleId: 0ed7379915944553721347052e
    
15. Content-Length: 251
    
16. 
    
17. <a href="https://www.iesdouyin.com/share/video/6835237313107299599/?region=CN&mid=6835237325144984328&u_code=g401eh52&titleType=title&utm_source=copy_link&utm_campaign=client_share&utm_medium=android&app=aweme">Found</a>.
    
18. 
    

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查看第二个链接：
https://www.iesdouyin.com/web/ap ... 7313107299599&dytk=
item_ids=6835237313107299599访问第一个链接目的寻找item_ids
第二个链接请求头部信息：

1. GET /web/api/v2/aweme/iteminfo/?item_ids=6835237313107299599&dytk= HTTP/1.1
   
2. Connection: Keep-Alive
   
3. Accept: */*
   
4. Accept-Language: zh-cn
   
5. Referer: https://www.iesdouyin.com/web/api/v2/aweme/iteminfo/?item_ids=6835237313107299599&dytk=
   
6. User-Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1
   
7. Host: www.iesdouyin.com
   

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要构建头部请求信息例如：GET /web/api/v2/aweme/iteminfo/?item_ids=6835237313107299599&dytk= HTTP/1.1
Referer: https://www.iesdouyin.com/web/api/v2/aweme/iteminfo/?item_ids=6835237313107299599&dytk=
其他的不变，get访问第二个网址：

https://www.iesdouyin.com/web/ap ... 7313107299599&dytk=

response返回json数据树形解析后：

你会发现json数据里面的播放地址路径：['item_list'][0].video['play_addr']['url_list'][0]
json解析，取出播放地址

1. https://aweme.snssdk.com/aweme/v1/playwm/?video_id=v0200ff10000brdq80oghl0h1dsq6lmg&ratio=720p&line=0

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再次带上协议头GET访问

1. <a href="http://v9-dy-y.ixigua.com/c04dc4cfdd79daca6ea01ff1e115c80a/5f098375/video/tos/cn/tos-cn-ve-15/da479e91a41645d2ab4750b988e0729e/?a=1128&br=3003&bt=1001&cr=0&cs=0&dr=0&ds=6&er=&l=2020071116161201001404601227EEBE3F&lr=&mime_type=video_mp4&qs=0&rc=am90Z2tvajN0dTMzNGkzM0ApOThpNjRmNWQzN2RnNDs5aGdqM3AuLWVsNWFfLS1jLS9zc2EwLWFhYy4zMy8uLTFjNDE6Yw%3D%3D&vl=&vr=">Found</a>.
   
2. 
   

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得到无水印的抖音视频链接代码
然后取出链接：

1. http://v9-dy-y.ixigua.com/c04dc4cfdd79daca6ea01ff1e115c80a/5f098375/video/tos/cn/tos-cn-ve-15/da479e91a41645d2ab4750b988e0729e/?a=1128&br=3003&bt=1001&cr=0&cs=0&dr=0&ds=6&er=&l=2020071116161201001404601227EEBE3F&lr=&mime_type=video_mp4&qs=0&rc=am90Z2tvajN0dTMzNGkzM0ApOThpNjRmNWQzN2RnNDs5aGdqM3AuLWVsNWFfLS1jLS9zc2EwLWFhYy4zMy8uLTFjNDE6Yw%3D%3D&vl=&vr=

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这个就是我们要寻找的无水印的产品链接

然后就可以下载下来啦

{:4_152:}