Kai A. Hiller
54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
# -*- coding: future_fstrings -*-
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# mautrix-telegram - A Matrix-Telegram puppeting bridge
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# Copyright (C) 2018 Tulir Asokan
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from typing import Dict, Optional
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import json
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import base64
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import hashlib
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def _get_checksum(key: str, payload: bytes) -> str:
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hasher = hashlib.sha256()
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hasher.update(payload)
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hasher.update(key.encode("utf-8"))
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checksum = hasher.hexdigest()
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return checksum
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def sign_token(key: str, payload: Dict) -> str:
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payload_b64 = base64.urlsafe_b64encode(json.dumps(payload).encode("utf-8"))
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checksum = _get_checksum(key, payload_b64)
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return f"{checksum}:{payload_b64.decode('utf-8')}"
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def verify_token(key: str, data: str) -> Optional[Dict]:
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if not data:
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return None
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try:
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checksum, payload = data.split(":", 1)
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except ValueError:
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return None
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if checksum != _get_checksum(key, payload.encode("utf-8")):
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return None
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payload = base64.urlsafe_b64decode(payload).decode("utf-8")
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try:
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return json.loads(payload)
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except json.JSONDecodeError:
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return None
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