This is not an officially supported Google product.
The Telegram Login Widget has been deprecated. The updated documentation refers to the login widget as the "legacy iframe-based JavaScript widget".
go-telegram-widget doesn't provide any relevant functionality for Log In With Telegram. Use a library that verifies the signature of JSON Web Tokens (JWTs) instead.
go-telegram-widget remains available for users of the Telegram Login Widget. However, no further updates to this library are planned.
go-telegram-widget simplifies the process of interacting with the Telegram login widget. This library provides a data type for expressing a Telegram user. It also provides utilities for interpreting the results of either the JavaScript callback or the URL redirect into this Telegram user data structure.
This library also verifies the Telegram user data as it interprets it. The library calls for interpreting the data also perform verification by comparing with the HMAC code returned from Telegram.