Validate Telegram Login Widget Auth Payloads in PHP and Yii2
Integrating the official Telegram Login Widget allows users to authenticate on a web application using their Telegram account. When a user authorizes via the widget, Telegram passes authentication parameters (such as id , first_name , username , auth_date , and hash ) back to your specified redirect URL or JavaScript callback. In this tutorial, we will construct a backend validation mechanism in…
This article provides a step-by-step guide for implementing a backend validation mechanism in PHP, specifically for a Yii2 application, that verifies authentication payloads received from the official Telegram Login Widget. The process involves constructing a data_check_string, generating a secret key using the SHA-256 hash of the bot token, and validating the payload signatures using the hash_equals() function.
The guide also explains how to bind verified telegram_id records in Yii2 and covers important aspects such as payload freshness verification and key derivation.
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