107 lines
3.2 KiB
Python
107 lines
3.2 KiB
Python
"""
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Authentication and security utilities
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"""
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from datetime import datetime, timedelta
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from typing import Optional, Union
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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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# 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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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 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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if expires_delta:
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expire = datetime.utcnow() + expires_delta
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else:
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expire = datetime.utcnow() + timedelta(minutes=settings.access_token_expire_minutes)
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to_encode.update({"exp": expire})
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encoded_jwt = jwt.encode(to_encode, settings.secret_key, algorithm=settings.algorithm)
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return encoded_jwt
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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 = jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
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username: str = payload.get("sub")
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if username is None:
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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 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_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 |