226 lines
6.9 KiB
Python
226 lines
6.9 KiB
Python
"""
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Authentication and security utilities
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"""
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from datetime import datetime, timedelta, timezone
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from typing import Optional, Union, Tuple
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from uuid import uuid4
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from sqlalchemy.orm import Session
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from fastapi import HTTPException, status, Depends
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from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
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from app.config import settings
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from app.database.base import get_db
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from app.models.user import User
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from app.models.auth import RefreshToken
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# Password hashing
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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# JWT Security
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security = HTTPBearer()
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optional_security = HTTPBearer(auto_error=False)
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def verify_password(plain_password: str, hashed_password: str) -> bool:
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"""Verify a plain password against its hash"""
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password: str) -> str:
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"""Generate password hash"""
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return pwd_context.hash(password)
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def _encode_with_rotation(payload: dict) -> str:
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"""Encode JWT with active secret and algorithm."""
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return jwt.encode(payload, settings.secret_key, algorithm=settings.algorithm)
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def _decode_with_rotation(token: str) -> dict:
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"""Decode JWT trying current then previous secret if set."""
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try:
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return jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
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except JWTError:
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# Try previous secret to allow seamless rotation
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if settings.previous_secret_key:
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try:
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return jwt.decode(token, settings.previous_secret_key, algorithms=[settings.algorithm])
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except JWTError:
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pass
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raise
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def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
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"""Create JWT access token"""
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to_encode = data.copy()
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expire = datetime.now(timezone.utc) + (
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expires_delta if expires_delta else timedelta(minutes=settings.access_token_expire_minutes)
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)
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to_encode.update({
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"exp": expire,
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"iat": datetime.now(timezone.utc),
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"type": "access",
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})
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return _encode_with_rotation(to_encode)
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def create_refresh_token(user: User, user_agent: Optional[str], ip_address: Optional[str], db: Session) -> str:
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"""Create refresh token, store its JTI in DB for revocation."""
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jti = uuid4().hex
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expire = datetime.now(timezone.utc) + timedelta(minutes=settings.refresh_token_expire_minutes)
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payload = {
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"sub": user.username,
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"uid": user.id,
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"jti": jti,
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"type": "refresh",
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"exp": expire,
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"iat": datetime.now(timezone.utc),
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}
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token = _encode_with_rotation(payload)
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db_token = RefreshToken(
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user_id=user.id,
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jti=jti,
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user_agent=user_agent,
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ip_address=ip_address,
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issued_at=datetime.now(timezone.utc),
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expires_at=expire,
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revoked=False,
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)
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db.add(db_token)
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db.commit()
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return token
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def _to_utc_aware(dt: Optional[datetime]) -> Optional[datetime]:
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"""Convert a datetime to UTC-aware. If naive, assume it's already UTC and attach tzinfo."""
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if dt is None:
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return None
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if dt.tzinfo is None:
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return dt.replace(tzinfo=timezone.utc)
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return dt.astimezone(timezone.utc)
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def verify_token(token: str) -> Optional[str]:
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"""Verify JWT token and return username"""
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try:
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payload = _decode_with_rotation(token)
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username: str = payload.get("sub")
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token_type: str = payload.get("type")
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if username is None:
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return None
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# Only accept access tokens for auth
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if token_type and token_type != "access":
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return None
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return username
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except JWTError:
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return None
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def decode_refresh_token(token: str) -> Optional[dict]:
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"""Decode refresh token and return payload if valid and not revoked."""
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try:
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payload = _decode_with_rotation(token)
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if payload.get("type") != "refresh":
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return None
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return payload
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except JWTError:
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return None
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def is_refresh_token_revoked(jti: str, db: Session) -> bool:
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token_row = db.query(RefreshToken).filter(RefreshToken.jti == jti).first()
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if not token_row:
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return True
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if token_row.revoked:
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return True
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expires_at_utc = _to_utc_aware(token_row.expires_at)
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now_utc = datetime.now(timezone.utc)
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return expires_at_utc is not None and expires_at_utc <= now_utc
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def revoke_refresh_token(jti: str, db: Session) -> None:
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token_row = db.query(RefreshToken).filter(RefreshToken.jti == jti).first()
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if token_row and not token_row.revoked:
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token_row.revoked = True
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token_row.revoked_at = datetime.now(timezone.utc)
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db.commit()
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def authenticate_user(db: Session, username: str, password: str) -> Optional[User]:
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"""Authenticate user credentials"""
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user = db.query(User).filter(User.username == username).first()
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if not user:
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return None
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if not verify_password(password, user.hashed_password):
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return None
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return user
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def get_current_user(
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credentials: HTTPAuthorizationCredentials = Depends(security),
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db: Session = Depends(get_db)
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) -> User:
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"""Get current authenticated user"""
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token = credentials.credentials
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username = verify_token(token)
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if username is None:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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user = db.query(User).filter(User.username == username).first()
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if user is None:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="User not found",
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headers={"WWW-Authenticate": "Bearer"},
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)
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if not user.is_active:
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raise HTTPException(
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status_code=status.HTTP_400_BAD_REQUEST,
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detail="Inactive user"
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)
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return user
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def get_optional_current_user(
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(optional_security),
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db: Session = Depends(get_db)
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) -> Optional[User]:
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"""Get current authenticated user, but allow None if not authenticated"""
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if not credentials:
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return None
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try:
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token = credentials.credentials
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username = verify_token(token)
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if username is None:
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return None
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user = db.query(User).filter(User.username == username).first()
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if user is None or not user.is_active:
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return None
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return user
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except Exception:
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return None
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def get_admin_user(current_user: User = Depends(get_current_user)) -> User:
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"""Require admin privileges"""
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if not current_user.is_admin:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Not enough permissions"
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)
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return current_user |