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Comments are now added in functions

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This commit is contained in:
killer069
2021-09-29 20:23:16 +05:30
parent 8e96e24aeb
commit 5d6b9167ed
15 changed files with 342 additions and 149 deletions
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37
play-dl/YouTube/utils/cipher.ts
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@@ -9,6 +9,7 @@ interface formatOptions {
cipher?: string;
s?: string;
}
// RegExp for various js functions
const var_js = '[a-zA-Z_\\$][a-zA-Z_0-9]*';
const singlequote_js = `'[^'\\\\]*(:?\\\\[\\s\\S][^'\\\\]*)*'`;
const duoblequote_js = `"[^"\\\\]*(:?\\\\[\\s\\S][^"\\\\]*)*"`;
@@ -37,7 +38,11 @@ const reverse_regexp = new RegExp(`(?:^|,)(${key_js})${reverse_function}`, 'm');
const slice_regexp = new RegExp(`(?:^|,)(${key_js})${slice_function}`, 'm');
const splice_regexp = new RegExp(`(?:^|,)(${key_js})${splice_function}`, 'm');
const swap_regexp = new RegExp(`(?:^|,)(${key_js})${swap_function}`, 'm');
/**
* Function to get tokens from html5player body data.
* @param body body data of html5player.
* @returns Array of tokens.
*/
export function js_tokens(body: string) {
const function_action = function_regexp.exec(body);
const object_action = obj_regexp.exec(body);
@@ -82,7 +87,12 @@ export function js_tokens(body: string) {
}
return tokens;
}
/**
* Function to decipher signature
* @param tokens Tokens from js_tokens function
* @param signature Signatured format url
* @returns deciphered signature
*/
function deciper_signature(tokens: string[], signature: string) {
let sig = signature.split('');
const len = tokens.length;
@@ -109,14 +119,24 @@ function deciper_signature(tokens: string[], signature: string) {
}
return sig.join('');
}
/**
* Function to swap positions in a array
* @param array array
* @param position position to switch with first element
* @returns new array with swapped positions.
*/
function swappositions(array: string[], position: number) {
const first = array[0];
array[0] = array[position];
array[position] = first;
return array;
}
/**
* Sets Download url with some extra parameter
* @param format video fomat
* @param sig deciphered signature
* @returns void
*/
function download_url(format: formatOptions, sig: string) {
let decoded_url;
if (!format.url) return;
@@ -132,8 +152,13 @@ function download_url(format: formatOptions, sig: string) {
}
format.url = parsed_url.toString();
}
export async function format_decipher(formats: formatOptions[], html5player: string) {
/**
* Main function which handles all queries related to video format deciphering
* @param formats video formats
* @param html5player url of html5player
* @returns array of format.
*/
export async function format_decipher(formats: formatOptions[], html5player: string): Promise<formatOptions[]> {
const body = await request(html5player);
const tokens = js_tokens(body);
formats.forEach((format) => {