telegram bot URL authorization

Question

There are tg bots, which has opportunities to open websites in a webview(iframe), inside of a telegram app. Whenewer you press on a button inside bot, it opens a webview with specific url. This allows to understand for opened website, that this url was opened buy SOME_USER and his auth data is correct (at least I think so).

Example of an url:

https://SOME_WEBSITE/#/login?
user=USER_GUID
&tgWebAppVersion=7.2
&linkBot=https://t.me/SOME_BOT_bot
&tgWebAppData=query_id=QUERY_ID
&user={
   "id":1,
   "first_name":"FirstName",
   "last_name":"LastName",
   "username":"UserName",
   "language_code":"en",
   "allows_write_to_pm":true
}
&auth_date=1713881657
&hash=SOME_HASH
&tgWebAppVersion=7.2
&tgWebAppPlatform=weba
&tgWebAppThemeParams={"bg_color":"#ffffff", ......... , "destructive_text_color":"#e53935"}

This url is not generated by bot. The bot contains only https://SOME_WEBSITE/#/login this part inside of a button. But when you press on a button, the telegram itself add all this specific auth data to url params. And opens this url in a webview(I've have intercept this url after pressing the button).

Question: "How can I generate such params for URL, by my own ?"

What I've tried alredy:

1. reading docs and found perhaps something I need "https://corefork.telegram.org/api/url-authorization"
2. try to use this methods(Messages_RequestUrlAuth, Messages_AcceptUrlAuth) from "wtelegramclient" library. Whitout success, maybe doing something wrong(receiving null's)

var resolvedUser = await _client.Contacts_ResolveUsername("someBotUserName");
var msgBase = await _client.Messages_GetHistory(new InputPeerUser(resolvedUser.User.ID, resolvedUser.User.access_hash), limit: 1);

var test1 = await _client.Messages_RequestUrlAuth(url: "https://some_url");
var test2 = await _client.Messages_AcceptUrlAuth(new InputPeerUser(resolvedUser.User.ID, resolvedUser.User.access_hash), msg_id: msgBase.Messages[0].ID, url: "https://some_url");

Answer 1

Finally! After long time searching telegram api docs + gramJS lib, the solution was found!

We need to use Messages_RequestWebView method from WTelegramClinet, same method also exists in gramJS.

//some basic theme params, perhaps it may be different per user, but it doesn't matter

var tgThemeParams = new
{
    bg_color = "#ffffff",
    text_color = "#000000",
    hint_color = "#707579",
    link_color = "#3390ec",
    //......
};

var themeParams = JsonConvert.SerializeObject(tgThemeParams);

//resolvedUser is the chat(bot) where you need to sign in

var resolvedUser = await _client.Contacts_ResolveUsername(setting.ChatName!);
var userPeer = new InputPeerUser(resolvedUser.User.ID, resolvedUser.User.access_hash);

var webViewRes = await client.Messages_RequestWebView(
    peer: userPeer,
    bot: userPeer,
    platform: "android",
    reply_to: null,
    url: "url from button / or url you need to sign in",
    theme_params: new DataJSON { data = themeParams },
    start_param: null,
    send_as: null,
    from_bot_menu: true,
    silent: false
);

The result will be url with all auth data needed!