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backend/app/core/security.py

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+from datetime import datetime, timedelta, timezone
+from uuid import UUID
+
+import jwt
+from argon2 import PasswordHasher
+from argon2.exceptions import VerifyMismatchError
+
+from app.core.config import get_settings
+
+_hasher = PasswordHasher()
+
+
+def hash_password(password: str) -> str:
+    return _hasher.hash(password)
+
+
+def verify_password(password: str, hashed: str) -> bool:
+    try:
+        return _hasher.verify(hashed, password)
+    except VerifyMismatchError:
+        return False
+
+
+def create_access_token(user_id: UUID) -> str:
+    settings = get_settings()
+    expires_at = datetime.now(timezone.utc) + timedelta(minutes=settings.jwt_expire_minutes)
+    payload = {"sub": str(user_id), "exp": expires_at}
+    return jwt.encode(payload, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)
+
+
+def decode_access_token(token: str) -> UUID | None:
+    settings = get_settings()
+    try:
+        payload = jwt.decode(token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm])
+    except jwt.InvalidTokenError:
+        return None
+    subject = payload.get("sub")
+    if subject is None:
+        return None
+    return UUID(subject)