dependencies.py

from fastapi import Depends, HTTPException
from main import SECRET_KEY, ALGORITHM
from models import db
from  sqlalchemy.orm import sessionmaker, Session
from models import Usuario
from jose import jwt, JWTError

def pegar_sessao():
  try:
    Session = sessionmaker(bind=db)
    session = Session()
    yield session
  finally:  
    session.close()

def verificar_token(token, session = Depends(pegar_sessao)):
    try:
       dic_info = jwt.decode(token, SECRET_KEY, ALGORITHM)
       user_id = int(dic_info.get("sub"))
    except JWTError:
       raise HTTPException(status_code=401, detail="Acesso Negado, verifique  a validade do token")   
    usuario = session.query(Usuario).filter(Usuario.id==user_id).first()
    if not usuario:
       raise HTTPException(status_code=401, detail="Acesso Inválido")
    return usuario