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

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

import { DataInterface } from "./interfaces/data.interface";

export class ExtractData {
  public static fromHeaders(request: any): DataInterface | null {
    const authDate = request.headers["tg-web-app-auth-date"];
    const queryId = request.headers["tg-web-app-query-id"];
    const userRaw = request.headers["tg-web-app-user"];

    if (!(authDate && queryId && userRaw)) {
      return null;
    }

    const userRawDecoded = decodeURIComponent(userRaw.toString());

    return {
      authDate: authDate as string,
      queryId: queryId as string,
      user: JSON.parse(userRawDecoded),
    };
  }
}