Created
April 4, 2024 18:08
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Telegram WebApp init data validator on Python
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from hmac import new as hmac_new | |
from hashlib import sha256 | |
from urllib.parse import unquote | |
def validate(init_data: str, token: str, c_str="WebAppData") -> None | dict[str, str]: | |
"""Validates init data from webapp to check if a method was received from Telegram | |
Args: | |
init_data (str): init_data string received from webapp | |
token (str): token of bot that initiated webapp | |
c_str (str, optional): Constant string for hash function, you shouldn't change that. Defaults to "WebAppData". | |
Returns: | |
None | dict[str, str]: object with data deserialized (user is not deserialized, you can do it by own, it's simple json) on successful validation, otherwise None | |
""" | |
hash_string = "" | |
init_data_dict = dict() | |
for chunk in init_data.split("&"): | |
[key, value] = chunk.split("=", 1) | |
if key == "hash": | |
hash_string = value | |
continue | |
init_data_dict[key] = unquote(value) | |
if hash_string == "": | |
return None | |
init_data = "\n".join( | |
[ | |
f"{key}={init_data_dict[key]}" | |
for key in sorted(init_data_dict.keys()) | |
] | |
) | |
secret_key = hmac_new(c_str.encode(), token.encode(), sha256).digest() | |
data_check = hmac_new(secret_key, init_data.encode(), sha256) | |
if data_check.hexdigest() != hash_string: | |
return None | |
return init_data_dict |
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