nukdokplex revised this gist . Go to revision
1 file changed, 43 insertions
telegram_webapp_validator.py(file created)
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| 1 | + | from hmac import new as hmac_new | |
| 2 | + | from hashlib import sha256 | |
| 3 | + | from urllib.parse import unquote | |
| 4 | + | ||
| 5 | + | ||
| 6 | + | def validate(init_data: str, token: str, c_str="WebAppData") -> None | dict[str, str]: | |
| 7 | + | """Validates init data from webapp to check if a method was received from Telegram | |
| 8 | + | Args: | |
| 9 | + | init_data (str): init_data string received from webapp | |
| 10 | + | token (str): token of bot that initiated webapp | |
| 11 | + | c_str (str, optional): Constant string for hash function, you shouldn't change that. Defaults to "WebAppData". | |
| 12 | + | Returns: | |
| 13 | + | 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 | |
| 14 | + | """ | |
| 15 | + | ||
| 16 | + | hash_string = "" | |
| 17 | + | ||
| 18 | + | init_data_dict = dict() | |
| 19 | + | ||
| 20 | + | for chunk in init_data.split("&"): | |
| 21 | + | [key, value] = chunk.split("=", 1) | |
| 22 | + | if key == "hash": | |
| 23 | + | hash_string = value | |
| 24 | + | continue | |
| 25 | + | init_data_dict[key] = unquote(value) | |
| 26 | + | ||
| 27 | + | if hash_string == "": | |
| 28 | + | return None | |
| 29 | + | ||
| 30 | + | init_data = "\n".join( | |
| 31 | + | [ | |
| 32 | + | f"{key}={init_data_dict[key]}" | |
| 33 | + | for key in sorted(init_data_dict.keys()) | |
| 34 | + | ] | |
| 35 | + | ) | |
| 36 | + | ||
| 37 | + | secret_key = hmac_new(c_str.encode(), token.encode(), sha256).digest() | |
| 38 | + | data_check = hmac_new(secret_key, init_data.encode(), sha256) | |
| 39 | + | ||
| 40 | + | if data_check.hexdigest() != hash_string: | |
| 41 | + | return None | |
| 42 | + | ||
| 43 | + | return init_data_dict | |
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