python下载是免费的吗-关于python下载imooc的免费视频的方法
前言
这几天收到很多回复，都是再说代码有问题，我很疑惑，经过反复几次回复我才知道，我的代码中一些关键的url被屏蔽掉了(imooc的网址)，所以导致代码报错，我服了，所以我打算把代码放到压缩包里面.在这里
软件功能方面
linux平台上，软件可以下载ｉmooc的视频并进行合成
windows平台需要ffmpeg并加入到环境变量里面
下面是原始文章
昨天心血来潮，突然想下载慕课网视频（免费视频），调试了几遍，得到了接口，接口很容易得到，只不过接口中的info字段是经过加密的，还有 m3u8的视频的AES-128秘钥也是经过加密的，还好他们用到的加密方法是一套，还不算费劲，后面我懒得写分析过程了（分析过程应该就属于浏览器调试的方法，后面我会单独出一篇文章）
慕课网的接口
{
"result": 1,
"data": {
"info": "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pTiPOMGyHRsJ",
"cdn": [
"aliyun",
"aliyun1",
"letv"
]
},
"msg": ""
}
这里面 info 里面字段就是加密（关于解密在后面）
这个url是获取 视频清晰度的, info字段就是3种清晰度的视频url
另外别的接口也都是有info字段的，所有的info字段都是经过加密的，主要的入口就是上面接口
获取视频的主要过程：
1.通过上面的接口——————返回3种清晰度视频的url
2.然后在请求其中一种清晰度url——————返回带有很多 .ts内容的url （其实就是相当于一个 index.m3u 文件，只不过也是将主要内容放到info字段进行加密了，是接口的形式，不是以文件的形式）
3.在第2步中返回值有秘钥的url(这个秘钥也是经过加密的放在info字段)请求这个秘钥url——————返回 秘钥在info字段中
4.请求多个ts文件并通过获取到的秘钥对ts视频进行解密
所以核心就是找到解密info的算法
解密info字段的js算法
简单调试找到了js的解密info的算法
function n(t, e) {
function r(t, e) {
var r = "";
if ("object" == typeof t)
for (var n = 0; n < t.length; n++)
r += String.fromCharCode(t[n]);
t = r || t;
for (var i, o, a = new Uint8Array(t.length), s = e.length, n = 0; n < t.length; n++)
o = n % s,
i = t[n],
i = i.toString().charCodeAt(0),
a[n] = i ^ e.charCodeAt(o);
return a
}
function n(t) {
var e = "";
if ("object" == typeof t)
for (var r = 0; r < t.length; r++)
e += String.fromCharCode(t[r]);
t = e || t;
var n = new Uint8Array(t.length);
for (r = 0; r < t.length; r++)
n[r] = t[r].toString().charCodeAt(0);
var i, o, r = 0;
for (r = 0; r < n.length; r++)
0 != (i = n[r] % 3) && r + i < n.length && (o = n[r + 1],
n[r + 1] = n[r + i],
n[r + i] = o,
r = r + i + 1);
return n
}
function i(t) {
var e = "";
if ("object" == typeof t)
for (var r = 0; r < t.length; r++)
e += String.fromCharCode(t[r]);
t = e || t;
var n = new Uint8Array(t.length);
for (r = 0; r < t.length; r++)
n[r] = t[r].toString().charCodeAt(0);
var r = 0,
i = 0,
o = 0,
a = 0;
for (r = 0; r < n.length; r++)
o = n[r] % 2,
o && r++,
a++;
var s = new Uint8Array(a);
for (r = 0; r < n.length; r++)
o = n[r] % 2,
s[i++] = o ? n[r++] : n[r];
return s
}
function o(t, e) {
var r = 0,
n = 0,
i = 0,
o = 0,
a = "";
if ("object" == typeof t)
for (var r = 0; r < t.length; r++)
a += String.fromCharCode(t[r]);
t = a || t;
var s = new Uint8Array(t.length);
for (r = 0; r < t.length; r++)
s[r] = t[r].toString().charCodeAt(0);
for (r = 0; r < t.length; r++) {
if (0 != (o = s[r] % 5) && 1 != o && r + o < s.length && (i = s[r + 1],
n = r + 2,
s[r + 1] = s[r + o],
s[o + r] = i,
(r = r + o + 1) - 2 > n)) {
for (; n < r - 2; n++) {
s[n] = s[n] ^ e.charCodeAt(n % e.length)
}
}
}
for (r = 0; r < t.length; r++)
s[r] = s[r] ^ e.charCodeAt(r % e.length);
return s
}
for (var a = {
data: {
info: t
}
}, s = {
q: r,
h: n,
m: i,
k: o
}, l = a.data.info, u = l.substring(l.length - 4).split(""), c = 0; c < u.length; c++)
u[c] = u[c].toString().charCodeAt(0) % 4;
u.reverse();
for (var d = [], c = 0; c < u.length; c++)
d.push(l.substring(u[c] + 1, u[c] + 2)),
l = l.substring(0, u[c] + 1) + l.substring(u[c] + 2);
a.data.encrypt_table = d,
a.data.key_table = [];
for (var c in a.data.encrypt_table)
"q" != a.data.encrypt_table[c] && "k" != a.data.encrypt_table[c] || (a.data.key_table.push(l.substring(l.length - 12)),
l = l.substring(0, l.length - 12));
a.data.key_table.reverse(),
a.data.info = l;
var f = new Array(-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
a.data.info = function(t) {
var e, r, n, i, o, a, s;
for (a = t.length,
o = 0,
s = ""; o < a;) {
do {
e = f[255 & t.charCodeAt(o++)]
} while (o < a && -1 == e);
if (-1 == e)
break;
do {
r = f[255 & t.charCodeAt(o++)]
} while (o < a && -1 == r);
if (-1 == r)
break;
s += String.fromCharCode(e << 2 | (48 & r) >> 4);
do {
if (61 == (n = 255 & t.charCodeAt(o++)))
return s;
n = f[n]
} while (o < a && -1 == n);
if (-1 == n)
break;
s += String.fromCharCode((15 & r) << 4 | (60 & n) >> 2);
do {
if (61 == (i = 255 & t.charCodeAt(o++)))
return s;
i = f[i]
} while (o < a && -1 == i);
if (-1 == i)
break;
s += String.fromCharCode((3 & n) << 6 | i)
}
return s
}(a.data.info);
for (var c in a.data.encrypt_table) {
var h = a.data.encrypt_table[c];
if ("q" == h || "k" == h) {
var p = a.data.key_table.pop();
a.data.info = s[a.data.encrypt_table[c]](a.data.info, p)
} else{
a.data.info = s[a.data.encrypt_table[c]](a.data.info)
}
}
if (e)
return a.data.info;
var g = "";
for (c = 0; c < a.data.info.length; c++)
g += String.fromCharCode(a.data.info[c]);
return g
}
简单测试一下这个加密算法是不是正确，在代码后面加上两句
a = n("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pTiPOMGyHRsJ")
console.log(a)
这个测试的内容就是第一个接口响应返回info中的内容
用node 运行一下结果
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=512000, RESOLUTION=1280x720
https://www.imooc.com/video/58ddf665e420e5315c8b461a/medium.m3u8?cdn=aliyun1&ssl=1&hxk_uri=aHR0cHM6Ly93d3cuaW1vb2MuY29tL3ZpZGVvLzU4ZGRmNjY1ZTQyMGU1MzE1YzhiNDYxYS9tZWRpdW0uaHhrP3RpbWVzdGFtcD0xNTY2MDkzMzYyJnRva2VuPWltb29jJTNBWWpSalpEVmtOMkkxTXpneU4yWXpObVU1T1dNM016TTVNREk0T1RNMU1qZG1OekF4WldReU13JTNEJTNE×tamp=1566093362&token=imooc%3AZDY1NzcyNWU1NDRmMWMzZWFlMDE3MTk2OTVkZDVhNTY2ODAzZjAwMg%3D%3D
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=384000, RESOLUTION=1280x720
https://www.imooc.com/video/58ddf665e420e5315c8b461a/medium.m3u8?cdn=aliyun1&ssl=1&hxk_uri=aHR0cHM6Ly93d3cuaW1vb2MuY29tL3ZpZGVvLzU4ZGRmNjY1ZTQyMGU1MzE1YzhiNDYxYS9tZWRpdW0uaHhrP3RpbWVzdGFtcD0xNTY2MDkzMzYyJnRva2VuPWltb29jJTNBWWpSalpEVmtOMkkxTXpneU4yWXpObVU1T1dNM016TTVNREk0T1RNMU1qZG1OekF4WldReU13JTNEJTNE×tamp=1566093362&token=imooc%3AZDY1NzcyNWU1NDRmMWMzZWFlMDE3MTk2OTVkZDVhNTY2ODAzZjAwMg%3D%3D
#EXT-X-STREAM-INF:PROGRAM-ID=1, BANDWIDTH=256000, RESOLUTION=720x480
https://www.imooc.com/video/58ddf665e420e5315c8b461a/low.m3u8?cdn=aliyun1&ssl=1&hxk_uri=aHR0cHM6Ly93d3cuaW1vb2MuY29tL3ZpZGVvLzU4ZGRmNjY1ZTQyMGU1MzE1YzhiNDYxYS9sb3cuaHhrP3RpbWVzdGFtcD0xNTY2MDkzMzYyJnRva2VuPWltb29jJTNBWWpSalpEVmtOMkkxTXpneU4yWXpObVU1T1dNM016TTVNREk0T1RNMU1qZG1OekF4WldReU13JTNEJTNE×tamp=1566093362&token=imooc%3AMzM2MjRjMDc1ODI0NjFkNDA0NjgwNjk4ZTc0NDEzNmFjOWQ2YzA2ZQ%3D%3D
可以看到已经解析出来3中清晰度视频的url了，可以说我用python调用node来完成info字段的解密，是完全没有问题的，但是总是感觉调用node不如使用完全的python好，所以我用python又实现了一遍这个算法，没错自从上次用python实现怎么学校的js(500多行)算法后，我就一发不可收拾了
python实现：enc.py(在压缩包里面)
python下载视频代码：api.py(在压缩包里面)
这段代码我挺满意的，因为里面的函数返回值都是像接口一样封装的，我用到的下载视频功能只是调用了每个函数的返回值中的一小部分，还有很多有用的信息我也都提取出来了，这里的main函数就相当于一个测试示例, 提供一个url就可以下载一个视频下面所有小节的视频了，如果这篇文章帮到你，可以给我个评论，谢谢，因为完成这个算法真的花费了我很大的力气
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