123 lines
3.8 KiB
Python
123 lines
3.8 KiB
Python
import uuid
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from datetime import datetime, timedelta
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from typing import List, Optional, Tuple
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from fastapi import Depends, HTTPException, Security, status
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from fastapi.security import OAuth2PasswordBearer, SecurityScopes
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from jose import jwt
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from jose.exceptions import ExpiredSignatureError
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from jwt import PyJWTError
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from pydantic import BaseModel, ValidationError
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from sqlalchemy import select
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from sqlalchemy.orm import Session
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from ..core.config import settings
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from ..models.device import Device
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from ..models.user import User as UserModel
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# to get a string like this run:
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from ..schemas.user_token import UserToken
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/token", scopes={})
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class Token(BaseModel):
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access_token: str
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token_type: str
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class TokenData(BaseModel):
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username: str = ""
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scopes: List[str] = []
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def f7(seq):
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seen = set()
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seen_add = seen.add
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return [x for x in seq if not (x in seen or seen_add(x))]
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def create_access_token(*, data: dict, expires_delta: timedelta = None):
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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=15)
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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 get_user(username: str, id_: str, locked_out: bool, scopes: List[str]) -> UserToken:
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return UserToken(
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id_=uuid.UUID(id_),
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name=username,
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locked_out=locked_out,
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password="",
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permissions=scopes,
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)
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def authenticate_user(username: str, password: str, db: Session) -> Optional[UserModel]:
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user = UserModel.auth(username, password, db)
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return user
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def device_allowed(user: UserModel, device_id: Optional[uuid.UUID], db: Session) -> Tuple[bool, Device]:
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device: Device = db.execute(select(Device).where(Device.id == device_id)).scalars().one_or_none()
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if device is None:
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device = Device.create(db)
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allowed = "add-devices" in set([p.name.replace(" ", "-").lower() for r in user.roles for p in r.permissions])
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return allowed or device.enabled, device
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async def get_current_user(
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security_scopes: SecurityScopes,
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token: str = Depends(oauth2_scheme),
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) -> UserToken:
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if security_scopes.scopes:
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authenticate_value = f'Bearer scope="{security_scopes.scope_str}"'
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else:
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authenticate_value = "Bearer"
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credentials_exception = 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": authenticate_value},
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)
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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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raise credentials_exception
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token_scopes = payload.get("scopes", [])
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token_data = TokenData(scopes=token_scopes, username=username)
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except (PyJWTError, ValidationError, ExpiredSignatureError):
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raise credentials_exception
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user = get_user(
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username=token_data.username,
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id_=payload.get("userId", None),
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locked_out=payload.get("lockedOut", True),
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scopes=token_scopes,
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)
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if user is None:
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raise credentials_exception
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for scope in security_scopes.scopes:
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if scope not in token_data.scopes:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Not enough permissions",
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headers={"WWW-Authenticate": authenticate_value},
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)
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return user
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async def get_current_active_user(
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current_user: UserToken = Security(get_current_user, scopes=["authenticated"])
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) -> UserToken:
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if current_user.locked_out:
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raise HTTPException(status_code=400, detail="Inactive user")
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return current_user
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