@app.get("/items/{item_id}")
def get_item(item_id: str, username: Annotated[str, Depends(get_username)]):
    if item_id not in data:
        raise HTTPException(status_code=404, detail="Item not found")
    item = data[item_id]
    if item["owner"] != username:
        raise OwnerError(username)

So, let's review it from that simplified point of view:

* The user types the `username` and `password` in the frontend, and hits `Enter`.
* The frontend (running in the user's browser) sends that `username` and `password` to a specific URL in our API (declared with `tokenUrl="token"`).
* The API checks that `username` and `password`, and responds with a "token" (we haven't implemented any of this yet).

            },
            "user": {"username": "johndoe", "full_name": "John Doe"},
        },
    )
    assert response.status_code == 200
    assert response.json() == {
        "item_id": 5,
        "item": {
            "name": "Foo",
            "price": 50.5,
            "description": "Some Foo",
            "tax": 0.1,
        },
        "user": {"username": "johndoe", "full_name": "John Doe"},
    }

                    },
                },
                "User": {
                    "title": "User",
                    "required": ["username"],
                    "type": "object",
                    "properties": {
                        "username": {"title": "Username", "type": "string"},
                        "full_name": {
                            "title": "Full Name",

                            "type": "string",
                        },
                        "username": {
                            "title": "Username",
                            "type": "string",
                        },
                    },
                    "required": [
                        "username",
                        "email",
                    ],
                    "title": "User",

                    "type": "object",
                    "title": "HTTPValidationError",
                },
                "Subscription": {
                    "properties": {
                        "username": {"type": "string", "title": "Username"},
                        "monthly_fee": {"type": "number", "title": "Monthly Fee"},
                        "start_date": {
                            "type": "string",

## Obtenha o `username` e a `password` { #get-the-username-and-password }

É utilizado o utils de segurança da **FastAPI** para obter o `username` e a `password`.

OAuth2 especifica que ao usar o "password flow" (fluxo de senha), que estamos usando, o cliente/usuário deve enviar os campos `username` e `password` como dados do formulário.

from pydantic import BaseModel

app = FastAPI()

api_key = APIKeyQuery(name="key", description="API Key Query")


class User(BaseModel):
    username: str


def get_current_user(oauth_header: str = Security(api_key)):
    user = User(username=oauth_header)
    return user


@app.get("/users/me")
def read_current_user(current_user: User = Depends(get_current_user)):
    return current_user

                    },
                    "ModelB": {
                        "title": "ModelB",
                        "required": ["username"],
                        "type": "object",
                        "properties": {
                            "username": {"title": "Username", "type": "string"}
                        },
                    },
                    "ValidationError": {

<abbr title="Специфікація">spec</abbr> вимагає, щоб ці поля мали точні назви `username` і `password` та надсилалися у вигляді полів форми, а не JSON.

З `Form` Ви можете оголошувати ті ж конфігурації, що і з `Body` (та `Query`, `Path`, `Cookie`), включаючи валідацію, приклади, псевдоніми (наприклад, `user-name` замість `username`) тощо.

/// info | Інформація