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refactor(Player.ts): Handle nsig failure gracefully

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Preping for future changes.
This commit is contained in:
Luan
2024-07-31 06:18:18 -03:00
parent 5529a6aca0
commit a89a5ac2dd
1 changed files with 17 additions and 16 deletions
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33
src/core/Player.ts
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@@ -8,16 +8,16 @@ const TAG = 'Player';
* Represents YouTube's player script. This is required to decipher signatures.
*/
export default class Player {
nsig_sc;
sig_sc;
sts;
player_id;
player_id: string;
sts: number;
nsig_sc?: string;
sig_sc?: string;
constructor(signature_timestamp: number, sig_sc: string, nsig_sc: string, player_id: string) {
constructor(player_id: string, signature_timestamp: number, sig_sc?: string, nsig_sc?: string) {
this.player_id = player_id;
this.sts = signature_timestamp;
this.nsig_sc = nsig_sc;
this.sig_sc = sig_sc;
this.sts = signature_timestamp;
this.player_id = player_id;
}
static async create(cache: ICache | undefined, fetch: FetchFunction = Platform.shim.fetch): Promise<Player> {
@@ -67,7 +67,7 @@ export default class Player {
Log.info(TAG, `Got signature timestamp (${sig_timestamp}) and algorithms needed to decipher signatures.`);
return await Player.fromSource(cache, sig_timestamp, sig_sc, nsig_sc, player_id);
return await Player.fromSource(player_id, sig_timestamp, cache, sig_sc, nsig_sc);
}
decipher(url?: string, signature_cipher?: string, cipher?: string, this_response_nsig_cache?: Map<string, string>): string {
@@ -79,7 +79,7 @@ export default class Player {
const args = new URLSearchParams(url);
const url_components = new URL(args.get('url') || url);
if (signature_cipher || cipher) {
if (this.sig_sc && (signature_cipher || cipher)) {
const signature = Platform.shim.eval(this.sig_sc, {
sig: args.get('s')
});
@@ -98,7 +98,7 @@ export default class Player {
const n = url_components.searchParams.get('n');
if (n) {
if (this.nsig_sc && n) {
let nsig;
if (this_response_nsig_cache && this_response_nsig_cache.has(n)) {
@@ -174,17 +174,18 @@ export default class Player {
const sig_sc = LZW.decompress(new TextDecoder().decode(sig_buf));
const nsig_sc = LZW.decompress(new TextDecoder().decode(nsig_buf));
return new Player(sig_timestamp, sig_sc, nsig_sc, player_id);
return new Player(player_id, sig_timestamp, sig_sc, nsig_sc);
}
static async fromSource(cache: ICache | undefined, sig_timestamp: number, sig_sc: string, nsig_sc: string, player_id: string): Promise<Player> {
const player = new Player(sig_timestamp, sig_sc, nsig_sc, player_id);
static async fromSource(player_id: string, sig_timestamp: number, cache?: ICache, sig_sc?: string, nsig_sc?: string): Promise<Player> {
const player = new Player(player_id, sig_timestamp, sig_sc, nsig_sc);
await player.cache(cache);
return player;
}
async cache(cache?: ICache): Promise<void> {
if (!cache) return;
if (!cache || !this.sig_sc || !this.nsig_sc)
return;
const encoder = new TextEncoder();
@@ -219,13 +220,13 @@ export default class Player {
return `function descramble_sig(a) { a = a.split(""); let ${obj_name}={${functions}}${calls} return a.join("") } descramble_sig(sig);`;
}
static extractNSigSourceCode(data: string): string {
static extractNSigSourceCode(data: string): string | undefined {
const match = data.match(/b=(?:a\.split\(|String\.prototype\.split\.call\(a,)""\).*?\}return (?:b\.join\(|Array\.prototype\.join\.call\(b,)""\)\}/s);
// Don't throw an error here.
if (!match) {
Log.warn(TAG, 'Failed to extract nsig decipher algorithm.');
return 'function descramble_nsig(a) { return a } descramble_nsig(nsig);';
return;
}
return `function descramble_nsig(a) { let ${match[0]} descramble_nsig(nsig)`;