Fastapi之JWT认证

JWT认证

from datetime import datetime, timedelta
from passlib.context import CryptContext
from jose import JWTError, jwt

SECRET_KEY = "60a633523fb43587dc02f6bd0f22a73a1d5d0b69f9de489de39523da92a7d2da"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 30


class Token(BaseModel):
    access_token: str
    token_type: str


pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
jwt_schema = OAuth2PasswordBearer(tokenUrl="/jwt")  # 认证接口地址

def verify_password(plain_password, hashed_password):
    """对密码进行校验"""
    return pwd_context.verify(plain_password, hashed_password)


def jwt_get_user(db, username: str):
    if username in db:
        user_dict = db[username]
        return UserInDB(**user_dict)


def jwt_authenticate_user(db, username: str, password: str):
    user = jwt_get_user(db, username)
    if not user:
        return False
    if not verify_password(password, user.hashed_password):
        return False
    return user


def create_access_token(data: dict, expire_delta: Optional[timedelta] = None):
    """创建Token"""
    to_encode = data.copy()
    if expire_delta:
        expire = datetime.utcnow() + expire_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=15)
    to_encode.update({"exp": expire})
    encode_jwt = jwt.encode(claims=to_encode, key=SECRET_KEY, algorithm=ALGORITHM)
    return encode_jwt


@tokens.post("/jwt", response_model=Token, summary="JWT获取token")
async def login_jwt(form_data: OAuth2PasswordRequestForm = Depends()):
    user = jwt_authenticate_user(db=fake_users_db, username=form_data.username, password=form_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"}
        )
    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    assess_token = create_access_token(data={"sub": form_data.username}, expire_delta=access_token_expires)
    return {"access_token": assess_token, "token_type": "Bearer"}


def jwt_get_user(db, username: str):
    if username in db:
        user_dict = db[username]
        return UserInDB(**user_dict)


async def jwt_get_current_user(token: str = Depends(jwt_schema)):
    """获取当前用户"""
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Can not validate credentials",
        headers={"WWW-Authenticate": "Bearer"}
    )
    try:
        # 校验Token合法性，内部会校验过期时间
        payload = jwt.decode(token=token, key=SECRET_KEY, algorithms=[ALGORITHM])
        username = payload.get("sub")
        if not username:
            raise credentials_exception
    except JWTError:
        raise credentials_exception
    user = jwt_get_user(db=fake_users_db, username=username)
    if not user:
        raise credentials_exception
    return user


async def jwt_get_current_activate_user(current_user: User = Depends(jwt_get_current_user)):
    """获取当前活跃的用户"""
    if current_user.disabled:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Inactive user"
        )
    return current_user


@tokens.get("/jwt_current_user", summary="获取活跃用户")
async def jwt_read_user_info(current_user: User = Depends(jwt_get_current_activate_user)):
    """获取活跃的用户"""
    return current_user