44 lines
2.6 KiB
Python
44 lines
2.6 KiB
Python
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from datetime import datetime, timedelta, timezone
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from typing import Optional
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from fastapi import Depends, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from pydantic import BaseModel
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SECRET_KEY = 'change-me-in-production'
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ALGORITHM = 'HS256'
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ACCESS_TOKEN_EXPIRE_MINUTES = 120
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pwd_context = CryptContext(schemes=['bcrypt'], deprecated='auto')
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl='/auth/token')
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class Token(BaseModel): access_token: str; token_type: str = 'bearer'
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class TokenData(BaseModel): username: Optional[str] = None
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class User(BaseModel): username: str; disabled: bool = False; role: str = 'viewer'
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class UserInDB(User): hashed_password: str
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fake_users_db = {'admin': {'username': 'admin', 'hashed_password': pwd_context.hash('admin123'), 'disabled': False, 'role': 'admin'}, 'viewer': {'username': 'viewer', 'hashed_password': pwd_context.hash('viewer123'), 'disabled': False, 'role': 'viewer'}}
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def verify_password(plain_password: str, hashed_password: str) -> bool: return pwd_context.verify(plain_password, hashed_password)
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def get_user(username: str) -> Optional[UserInDB]:
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user = fake_users_db.get(username)
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return UserInDB(**user) if user else None
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def authenticate_user(username: str, password: str) -> Optional[UserInDB]:
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user = get_user(username)
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return user if user and verify_password(password, user.hashed_password) else None
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def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
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to_encode = data.copy()
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expire = datetime.now(timezone.utc) + (expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES))
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to_encode.update({'exp': expire})
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return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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def get_current_user(token: str = Depends(oauth2_scheme)) -> User:
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credentials_exception = HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail='Could not validate credentials', headers={'WWW-Authenticate': 'Bearer'})
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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username: str = payload.get('sub')
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if username is None: raise credentials_exception
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except JWTError:
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raise credentials_exception
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user = get_user(username)
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if user is None: raise credentials_exception
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return User(username=user.username, disabled=user.disabled, role=user.role)
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def get_current_active_user(current_user: User = Depends(get_current_user)) -> User:
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if current_user.disabled: raise HTTPException(status_code=400, detail='Inactive user')
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return current_user
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