4c86a5b9ca
Self-hosted US Congress monitoring platform with AI policy briefs, bill/member/topic follows, ntfy + RSS + email notifications, alignment scoring, collections, and draft-letter generator. Authored by: Jack Levy
45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
"""Symmetric encryption for sensitive user prefs (e.g. ntfy password).
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Key priority:
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1. ENCRYPTION_SECRET_KEY env var (recommended — dedicated key, easily rotatable)
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2. Derived from JWT_SECRET_KEY (fallback for existing installs)
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Generate a dedicated key:
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python -c "from cryptography.fernet import Fernet; print(Fernet.generate_key().decode())"
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"""
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import base64
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import hashlib
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from cryptography.fernet import Fernet
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_PREFIX = "enc:"
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_fernet_instance: Fernet | None = None
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def _fernet() -> Fernet:
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global _fernet_instance
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if _fernet_instance is None:
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from app.config import settings
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if settings.ENCRYPTION_SECRET_KEY:
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# Use dedicated key directly (must be a valid 32-byte base64url key)
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_fernet_instance = Fernet(settings.ENCRYPTION_SECRET_KEY.encode())
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else:
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# Fallback: derive from JWT secret
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key_bytes = hashlib.sha256(settings.JWT_SECRET_KEY.encode()).digest()
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_fernet_instance = Fernet(base64.urlsafe_b64encode(key_bytes))
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return _fernet_instance
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def encrypt_secret(plaintext: str) -> str:
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"""Encrypt a string and return a prefixed ciphertext."""
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if not plaintext:
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return plaintext
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return _PREFIX + _fernet().encrypt(plaintext.encode()).decode()
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def decrypt_secret(value: str) -> str:
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"""Decrypt a value produced by encrypt_secret. Returns plaintext as-is (legacy support)."""
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if not value or not value.startswith(_PREFIX):
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return value # legacy plaintext — return unchanged
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return _fernet().decrypt(value[len(_PREFIX):].encode()).decode()
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