342 lines
3.1 KiB
Python
342 lines
3.1 KiB
Python
from dataclasses import dataclass
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from datetime import datetime, timedelta, timezone
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from fastapi import Depends, HTTPException, status
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from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
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from jose import JWTError, jwt
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from sqlalchemy import func, select
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from sqlalchemy.orm import Session
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from app.config import get_settings
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from app.database import get_db
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from app.models.user import USER_ROLE_ADMIN, User
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bearer_scheme = HTTPBearer(auto_error=False)
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@dataclass(frozen=True)
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class CurrentUser:
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username: str
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role: str
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@property
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def is_admin(self) -> bool:
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return self.role == USER_ROLE_ADMIN
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def create_access_token(subject: str, role: str) -> str:
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settings = get_settings()
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expire = datetime.now(timezone.utc) + timedelta(minutes=settings.jwt_expire_minutes)
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payload = {"sub": subject, "role": role, "exp": expire}
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return jwt.encode(payload, settings.jwt_secret, algorithm=settings.jwt_algorithm)
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def _user_from_db(db: Session, username: str) -> User:
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normalized = username.strip()
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user = db.scalar(select(User).where(func.lower(User.username) == normalized.lower()))
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if user is None or not user.is_active:
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raise HTTPException(status_code=401, detail="Invalid token")
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return user
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def _decode_current_user(token: str, db: Session | None = None) -> CurrentUser:
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settings = get_settings()
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try:
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payload = jwt.decode(
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token,
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settings.jwt_secret,
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algorithms=[settings.jwt_algorithm],
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)
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username = payload.get("sub")
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if not username:
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raise HTTPException(status_code=401, detail="Invalid token")
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if db is not None:
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user = _user_from_db(db, str(username))
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return CurrentUser(username=user.username, role=user.role)
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role = str(payload.get("role") or USER_ROLE_ADMIN)
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return CurrentUser(username=str(username), role=role)
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except JWTError as exc:
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raise HTTPException(status_code=401, detail="Invalid token") from exc
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def verify_access_token(token: str, db: Session | None = None) -> str:
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"""Проверка JWT (в т.ч. query-параметр для SSE). Возвращает username."""
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return _decode_current_user(token, db=db).username
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def get_current_user(
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credentials: HTTPAuthorizationCredentials | None = Depends(bearer_scheme),
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db: Session = Depends(get_db),
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) -> CurrentUser:
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if credentials is None or credentials.scheme.lower() != "bearer":
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Not authenticated",
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)
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return _decode_current_user(credentials.credentials, db=db)
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def require_admin(user: CurrentUser = Depends(get_current_user)) -> CurrentUser:
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if not user.is_admin:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Admin access required",
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)
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return user
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