Criando Endpoints de Auth

Agora precisamos mapear a função de geração e validação de tokens na API, expondo a URL /token para que possamos gerar um token para um usuário.

EDITE dundie/routes/auth.py

from datetime import timedelta

from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordRequestForm

from dundie.auth import (
    RefreshToken,
    Token,
    User,
    authenticate_user,
    create_access_token,
    create_refresh_token,
    get_user,
    validate_token,
)
from dundie.config import settings

ACCESS_TOKEN_EXPIRE_MINUTES = settings.security.access_token_expire_minutes  # pyright: ignore
REFRESH_TOKEN_EXPIRE_MINUTES = settings.security.refresh_token_expire_minutes  # pyright: ignore

router = APIRouter()


@router.post("/token", response_model=Token)
async def login_for_access_token(
    form_data: OAuth2PasswordRequestForm = Depends(),
):
    user = authenticate_user(get_user, form_data.username, form_data.password)
    if not user or not isinstance(user, 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)  # pyright: ignore
    access_token = create_access_token(
        data={"sub": user.username, "fresh": True},
        expires_delta=access_token_expires,
    )

    refresh_token_expires = timedelta(minutes=REFRESH_TOKEN_EXPIRE_MINUTES)  # pyright: ignore
    refresh_token = create_refresh_token(
        data={"sub": user.username}, expires_delta=refresh_token_expires
    )

    return {
        "access_token": access_token,
        "refresh_token": refresh_token,
        "token_type": "bearer",
    }


@router.post("/refresh_token", response_model=Token)
async def refresh_token(form_data: RefreshToken):
    user = await validate_token(token=form_data.refresh_token)

    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)  # pyright: ignore
    access_token = create_access_token(
        data={"sub": user.username, "fresh": False},
        expires_delta=access_token_expires,
    )

    refresh_token_expires = timedelta(minutes=REFRESH_TOKEN_EXPIRE_MINUTES)  # pyright: ignore
    refresh_token = create_refresh_token(
        data={"sub": user.username}, expires_delta=refresh_token_expires
    )

    return {
        "access_token": access_token,
        "refresh_token": refresh_token,
        "token_type": "bearer",
    }

E agora vamos adicionar essas URLS ao router principal

EDITE dundie/routes/__init__.py

No topo na linha 3

from .auth import router as auth_router

E depois na linha 9

main_router.include_router(auth_router, tags=["auth"])

Vamos testar a aquisição de um token via curl. (ou pode utilizar algum outro cliente HTTP de sua preferencia como o Imsomnia ou Postman)

curl -X 'POST' \
  'http://localhost:8000/token' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/x-www-form-urlencoded' \
  -d 'username=michael-scott&password=boss123'

passe como parametro os dados de um usuário que tenha criado via linha de comando.

Resposta:

{
  "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJhZG1pbiIsImZyZXNoIjp0cnVlLCJleHAiOjE2Njg2Mjg0NjgsInNjb3BlIjoiYWNjZXNzX3Rva2VuIn0.P-F3onD2vFFIld_ls1irE9rOgLNk17SNDASls31lgkU",
  "refresh_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJhZG1pbiIsImV4cCI6MTY2ODY2MjY2OCwic2NvcGUiOiJyZWZyZXNoX3Rva2VuIn0.AWV8QtySYmcukxTgTa9GedLK00o6wrbyMt9opW42eyQ",
  "token_type": "bearer"
}

agora sim já conseguimos gerar o token, só falta proteger as URLs -->