passport-telegram-web-app/src/extract-hash.class.ts

A [Passport](https://www.passportjs.org/) strategy for [telegram web app (bots)](https://core.telegram.org/bots/webapps) authentication.

export class ExtractHash {
  public static fromHeaders(request: any): string | null {
    const hash = request.headers["tg-web-app-hash"];

    if (!hash) {
      return null;
    }

    return hash as string;
  }
}