dependencies.py

# dependencies.py
from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from jose import JWTError, jwt
from sqlalchemy.orm import Session
from database import SessionLocal
from models import User
from utils import SECRET_KEY, ALGORITHM

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="login")

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="No se pudo validar las credenciales",
        headers={"WWW-Authenticate": "Bearer"},
    )
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        username: str = payload.get("sub")
        if username is None:
            raise credentials_exception
    except JWTError:
        raise credentials_exception
    user = db.query(User).filter(User.username == username).first()
    if user is None:
        raise credentials_exception
    return user