抖音网页版上传视频_signature分析
本帖最后由 韩龙 于 2020-2-5 02:13 编辑前几天。抖音网页版发布视频最后布加入了_signature参数
所以没有正确的SIGNATURE发布会直接显示，视频未通过
自己也尝试分析了下。但是还是没有提取出来。具体那个步骤出错还不清楚。
发布POST如下
media.douyin.com/web/api/media/aweme/create/?_signature=tVydtAAgEA1Hc6.zclu8-LVcnaAAOjK
video_id=v0200f550000bngc777a1hai6lt6tlrg&poster=tos-cn-p-0015%2Fa456e85a0e014581b8e3e9d92db53af1&poster_delay=0&text=123456789&text_extra=%5B%5D&visibility_type=0&challenges=%5B%5D&mentions=%5B%5D&third_text=123456789&download=0&upload_source=1&shop_draft_id=&mix_id=&mix_order=
其余参数都可以在其他地方获取到。具体的我不分析了，我只对signature分析谷歌浏览器，web开发工具插件
点开SOURCES资源。搜索signature
查找结果如下。一个个查看下。最终确定在最后一个
点击括号格式化代码
在当前的文档搜索signature
可以看到_signature是由i赋值过来的。
var i = Object(_byted_acrawler__WEBPACK_IMPORTED_MODULE_1__.sign)(o);
如我们不确定可以在这里下个断。上面截图中就是断下的i的值。证明我们是找对了地方的
_byted_acrawler__WEBPACK_IMPORTED_MODULE_1__这猜测是一个函数，但是又是什么玩意?玩上翻多几行。可以看到。
_byted_acrawler__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(“43703b0f330bf4830f6c”)
是通过webpack打包工具之后的一个请求。
继续全资源搜索这个43703b0f330bf4830f6c
只有2个地方出现过。我们点进去看看再说，
看到这里其实跟获取无水印的那个signature很相似。具体见最后的DEMO
var i = Object(_byted_acrawler__WEBPACK_IMPORTED_MODULE_1__.sign)(o);中的o是
在console中调试O好像没起作用
因为我这里要求不用到模块，调用。要扒出来用。
下面是我参考了获取无水印代码写的HTML。
<script type="text/javascript">
var s = function(l) {
this.navigator = {
userAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0)"
}
var e = {}
var n = (function () {
function e(e, a, r) {
return (b || (b = t("x,y", "return x " + e + " y")))(r, a)
}
function a(e, a, r) {
return (k || (k = t("x,y", "return new x(" + Array(r + 1).join(",x[++y]").substr(1) + ")")))(e, a)
}
function r(e, a, r) {
var n, t, s = {}, b = s.d = r ? r.d + 1 : 0;
for (s["$" + b] = s,
t = 0; t < b; t++)
s = r;
for (t = 0,
b = s.length = a.length; t < b; t++)
s = a;
return c(e, 0, s)
}
function c(t, b, k) {
function u(e) {
v = e
}
function f() {
return g = t.charCodeAt(b++) - 32,
t.substring(b, b += g)
}
function l() {
try {
y = c(t, b, k)
} catch (e) {
h = e,
y = l
}
}
for (var h, y, d, g, v = [], x = 0; ; )
switch (g = t.charCodeAt(b++) - 32) {
case 1:
u(!v[--x]);
break;
case 4:
v = f();
break;
case 5:
u(function(e) {
var a = 0
, r = e.length;
return function() {
var c = a < r;
return c && u(e),
c
}
}(v[--x]));
break;
case 6:
y = v[--x],
u(v[--x](y));
break;
case 8:
if (g = t.charCodeAt(b++) - 32,
l(),
b += g,
g = t.charCodeAt(b++) - 32,
y === c)
b += g;
else if (y !== l)
return y;
break;
case 9:
v = c;
break;
case 10:
u(s(v[--x]));
break;
case 11:
y = v[--x],
u(v[--x] + y);
break;
case 12:
for (y = f(),
d = [],
g = 0; g < y.length; g++)
d = y.charCodeAt(g) ^ g + y.length;
u(String.fromCharCode.apply(null, d));
break;
case 13:
y = v[--x],
h = delete v[--x];
break;
case 14:
v = t.charCodeAt(b++) - 32;
break;
case 59:
u((g = t.charCodeAt(b++) - 32) ? (y = x,
v.slice(x -= g, y)) : []);
break;
case 61:
u(v[--x]);
break;
case 62:
g = v[--x],
k = 65599 * k + k.charCodeAt(g) >>> 0;
break;
case 65:
h = v[--x],
y = v[--x],
v[--x] = h;
break;
case 66:
u(e(t, v[--x], v[--x]));
break;
case 67:
y = v[--x],
d = v[--x],
u((g = v[--x]).x === c ? r(g.y, y, g.z) : g.apply(d, y));
break;
case 68:
u(e((g = t) < "<" ? (b--,
f()) : g + g, v[--x], v[--x]));
break;
case 70:
u(!1);
break;
case 71:
v = n;
break;
case 72:
v = +f();
break;
case 73:
u(parseInt(f(), 36));
break;
case 75:
if (v[--x]) {
b++;
break
}
case 74:
g = t.charCodeAt(b++) - 32 << 16 >> 16,
b += g;
break;
case 76:
u(k);
break;
case 77:
y = v[--x],
u(v[--x]);
break;
case 78:
g = t.charCodeAt(b++) - 32,
u(a(v, x -= g + 1, g));
break;
case 79:
g = t.charCodeAt(b++) - 32,
u(k["$" + g]);
break;
case 81:
h = v[--x],
v[--x] = h;
break;
case 82:
u(v[--x]);
break;
case 83:
h = v[--x],
k = h;
break;
case 84:
v = !0;
break;
case 85:
v = void 0;
break;
case 86:
u(v);
break;
case 88:
h = v[--x],
y = v[--x],
v = h,
v = y;
break;
case 89:
u(function() {
function e() {
return r(e.y, arguments, k)
}
return e.y = f(),
e.x = c,
e.z = k,
e
}());
break;
case 90:
v = null;
break;
case 91:
v = h;
break;
case 93:
h = v[--x];
break;
case 0:
return v[--x];
default:
u((g << 16 >> 16) - 16)
}
}
var n = this
, t = n.Function
, s = Object.keys || function(e) {
var a = {}
, r = 0;
for (var c in e)
a = c;
return a.length = r,
a
}
, b = {}
, k = {};
return r
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return e.sign(l)
}
this.o = {
url: "https://media.douyin.com/web/api/media/aweme/create/",
body:{
challenges: "[]",
download: "0",
mentions: "[]",
mix_id: "",
mix_order: "",
poster: "tos-cn-p-0015/dbcd771230284c068a414e57d3ecb1b8",
poster_delay: "0",
shop_draft_id: "",
text: "123456789",
text_extra: "[]",
third_text: "123456789",
upload_source: "1",
video_id: "v0200fab0000bngc7rjcp2317mrq6mkg",
visibility_type: "0"
}
}
document.write(s(o))
</script>
后面扒出来之后生成的signature不对。卡在这里了….
最重要是算法下面那个高混淆的代码我不会还原，不知道啥逻辑在里面
今天抽空翻了下github找了下解决方案。
简介明了：https://github.com/coder-fly/douyin-signature
厉害，这一大串case看的有点上头。。。 本帖最后由 韩龙 于 2019-12-4 00:11 编辑
majia4075669072 发表于 2019-12-4 00:05
厉害，这一大串case看的有点上头。。。
没用阿:rggrg那串算法代码浏览器可以解析出来的 略有帮助，感谢分享~！ mzhsohu 发表于 2019-12-4 01:02
略有帮助，感谢分享~！
我发现我是来求助的。反而是帮助了{:1_907:} 为认真的人点赞 我也遇到这个问题，楼主解决了么？ xhchjuan 发表于 2020-1-7 09:10
我也遇到这个问题，楼主解决了么？
没有解决 signature 这个参数我也没搞定。 这个signature，如果是用网页做，就用去年那个JS就行了，但反JS移到APP里，就是不行，从来没所到过，哈哈,应该是需要某个特别的协议头或COOKIES