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import axios from "axios";
import crypto from "crypto";
import createHttpError from "http-errors";
// https://megacloud.tv/embed-2/e-1/dBqCr5BcOhnD?k=1
const megacloud = {
script: "https://megacloud.tv/js/player/a/prod/e1-player.min.js?v=",
sources: "https://megacloud.tv/embed-2/ajax/e-1/getSources?id=",
} as const;
type track = {
file: string;
kind: string;
label?: string;
default?: boolean;
};
type intro_outro = {
start: number;
end: number;
};
type unencryptedSrc = {
file: string;
type: string;
};
type extractedSrc = {
sources: string | unencryptedSrc[];
tracks: track[];
encrypted: boolean;
intro: intro_outro;
outro: intro_outro;
server: number;
};
interface ExtractedData
extends Pick<extractedSrc, "intro" | "outro" | "tracks"> {
sources: { url: string; type: string }[];
}
class MegaCloud {
private serverName = "megacloud";
async extract(videoUrl: URL) {
try {
const extractedData: ExtractedData = {
tracks: [],
intro: {
start: 0,
end: 0,
},
outro: {
start: 0,
end: 0,
},
sources: [],
};
const videoId = videoUrl?.href?.split("/")?.pop()?.split("?")[0];
const { data: srcsData } = await axios.get<extractedSrc>(
megacloud.sources.concat(videoId || ""),
{
headers: {
Accept: "*/*",
"X-Requested-With": "XMLHttpRequest",
"User-Agent":
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36",
Referer: videoUrl.href,
},
}
);
if (!srcsData) {
throw createHttpError.NotFound("Url may have an invalid video id");
}
// console.log(JSON.stringify(srcsData, null, 2));
const encryptedString = srcsData.sources;
if (srcsData.encrypted && Array.isArray(encryptedString)) {
extractedData.intro = srcsData.intro;
extractedData.outro = srcsData.outro;
extractedData.tracks = srcsData.tracks;
extractedData.sources = encryptedString.map((s) => ({
url: s.file,
type: s.type,
}));
return extractedData;
}
let text: string;
const { data } = await axios.get(
megacloud.script.concat(Date.now().toString())
);
text = data;
if (!text) {
throw createHttpError.InternalServerError(
"Couldn't fetch script to decrypt resource"
);
}
const vars = this.extractVariables(text, "MEGACLOUD");
const { secret, encryptedSource } = this.getSecret(
encryptedString as string,
vars
);
const decrypted = this.decrypt(encryptedSource, secret);
try {
const sources = JSON.parse(decrypted);
extractedData.intro = srcsData.intro;
extractedData.outro = srcsData.outro;
extractedData.tracks = srcsData.tracks;
extractedData.sources = sources.map((s: any) => ({
url: s.file,
type: s.type,
}));
return extractedData;
} catch (error) {
throw createHttpError.InternalServerError("Failed to decrypt resource");
}
} catch (err) {
// console.log(err);
throw err;
}
}
extractVariables(text: string, sourceName: string) {
// extract needed variables
let allvars;
if (sourceName !== "MEGACLOUD") {
allvars =
text
.match(
/const (?:\w{1,2}=(?:'.{0,50}?'|\w{1,2}\(.{0,20}?\)).{0,20}?,){7}.+?;/gm
)
?.at(-1) ?? "";
} else {
allvars =
text
.match(/const \w{1,2}=new URLSearchParams.+?;(?=function)/gm)
?.at(-1) ?? "";
}
// and convert their values into an array of numbers
const vars = allvars
.slice(0, -1)
.split("=")
.slice(1)
.map((pair) => Number(pair.split(",").at(0)))
.filter((num) => num === 0 || num);
return vars;
}
getSecret(encryptedString: string, values: number[]) {
let secret = "",
encryptedSource = encryptedString,
totalInc = 0;
for (let i = 0; i < values[0]!; i++) {
let start, inc;
switch (i) {
case 0:
(start = values[2]), (inc = values[1]);
break;
case 1:
(start = values[4]), (inc = values[3]);
break;
case 2:
(start = values[6]), (inc = values[5]);
break;
case 3:
(start = values[8]), (inc = values[7]);
break;
case 4:
(start = values[10]), (inc = values[9]);
break;
case 5:
(start = values[12]), (inc = values[11]);
break;
case 6:
(start = values[14]), (inc = values[13]);
break;
case 7:
(start = values[16]), (inc = values[15]);
break;
case 8:
(start = values[18]), (inc = values[17]);
}
const from = start! + totalInc,
to = from + inc!;
(secret += encryptedString.slice(from, to)),
(encryptedSource = encryptedSource.replace(
encryptedString.substring(from, to),
""
)),
(totalInc += inc!);
}
return { secret, encryptedSource };
}
decrypt(encrypted: string, keyOrSecret: string, maybe_iv?: string) {
let key;
let iv;
let contents;
if (maybe_iv) {
key = keyOrSecret;
iv = maybe_iv;
contents = encrypted;
} else {
// copied from 'https://github.com/brix/crypto-js/issues/468'
const cypher = Buffer.from(encrypted, "base64");
const salt = cypher.subarray(8, 16);
const password = Buffer.concat([
Buffer.from(keyOrSecret, "binary"),
salt,
]);
const md5Hashes = [];
let digest = password;
for (let i = 0; i < 3; i++) {
md5Hashes[i] = crypto.createHash("md5").update(digest).digest();
digest = Buffer.concat([md5Hashes[i], password]);
}
key = Buffer.concat([md5Hashes[0], md5Hashes[1]]);
iv = md5Hashes[2];
contents = cypher.subarray(16);
}
const decipher = crypto.createDecipheriv("aes-256-cbc", key, iv);
const decrypted =
decipher.update(
contents as any,
typeof contents === "string" ? "base64" : undefined,
"utf8"
) + decipher.final();
return decrypted;
}
}
export default MegaCloud;
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