Created
November 8, 2020 18:58
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Better sign check example (works in Python 3.6+)
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| from base64 import b64encode | |
| from hashlib import sha256 | |
| from hmac import HMAC | |
| from urllib.parse import urlparse, parse_qsl, urlencode | |
| def sign_checker(query: dict, secret: str) -> bool: | |
| """Check VK Apps signature""" | |
| vk_subset = filter( | |
| lambda key: key.startswith("vk_"), | |
| query | |
| ) | |
| ordered = {k: query[k] for k in sorted(vk_subset)} | |
| hash_code = b64encode( | |
| HMAC( | |
| secret.encode(), | |
| urlencode(ordered, doseq=True).encode(), | |
| sha256 | |
| ).digest() | |
| ).decode("utf-8") | |
| fixed_hash = hash_code[:-1 if hash_code[-1] == "=" else None].replace('+', '-').replace('/', '_') | |
| return query.get("sign") == fixed_hash |
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