public void write(char[] cbuf, int off, int len) throws IOException {
        super.write(cbuf, off, len);
        flush();
      }

      @Override
      public void write(String str, int off, int len) throws IOException {
        super.write(str, off, len);
        flush();
      }
    };
  }

def get_username():
    try:
        yield "Rick"
    except OwnerError as e:
        raise HTTPException(status_code=400, detail=f"Owner error: {e}")


@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:

{* ../../docs_src/security/tutorial002_an_py310.py hl[25] *}

## Get the user { #get-the-user }

`get_current_user` will use a (fake) utility function we created, that takes a token as a `str` and returns our Pydantic `User` model:

`get_current_user`는 이전에 생성한 것과 동일한 `oauth2_scheme`에 대한 의존성을 갖게 됩니다.

이전에 *경로 처리*에서 직접 수행했던 것과 동일하게, 새 의존성 `get_current_user`는 하위 의존성 `oauth2_scheme`로부터 `str`로 `token`을 받게 됩니다:

{* ../../docs_src/security/tutorial002_an_py310.py hl[25] *}

## 사용자 가져오기 { #get-the-user }

`get_current_user`는 우리가 만든 (가짜) 유틸리티 함수를 사용합니다. 이 함수는 `str`로 토큰을 받아 Pydantic `User` 모델을 반환합니다:

{* ../../docs_src/security/tutorial002_an_py310.py hl[19:22,26:27] *}

from collections.abc import AsyncIterable, Iterable

from fastapi import FastAPI
from fastapi.sse import EventSourceResponse
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    description: str | None


items = [
    Item(name="Plumbus", description="A multi-purpose household device."),
    Item(name="Portal Gun", description="A portal opening device."),

from fastapi import FastAPI, Header

app = FastAPI()


@app.get("/items/")
async def read_items(user_agent: str | None = Header(default=None)):

    yield "s"
    raise ValueError("Broken after yield")


app = FastAPI()


@app.get("/catching")
def catching(d: Annotated[str, Depends(catching_dep)]) -> Any:
    raise CustomError("Simulated error during streaming")


@app.get("/broken")
def broken(d: Annotated[str, Depends(broken_dep)]) -> Any:
    return {"message": "all good?"}


client = TestClient(app)


def test_catching():

from inline_snapshot import snapshot
from pydantic import BaseModel

app = FastAPI()

oid = OpenIdConnect(openIdConnectUrl="/openid", auto_error=False)


class User(BaseModel):
    username: str


def get_current_user(oauth_header: str | None = Security(oid)):
    if oauth_header is None:
        return None
    user = User(username=oauth_header)
    return user


@app.get("/users/me")

記得依賴可以有子依賴嗎？

`get_current_user` 會依賴我們先前建立的相同 `oauth2_scheme`。

如同先前在*路徑操作*中直接做的一樣，新的依賴 `get_current_user` 會從子依賴 `oauth2_scheme` 接收一個作為 `str` 的 `token`：

{* ../../docs_src/security/tutorial002_an_py310.py hl[25] *}

## 取得使用者 { #get-the-user }

`get_current_user` 會使用我們建立的（假的）工具函式，它接收一個作為 `str` 的 token，並回傳我們的 Pydantic `User` 模型：

{* ../../docs_src/security/tutorial002_an_py310.py hl[19:22,26:27] *}

from typing import Annotated

from fastapi import FastAPI, Header

app = FastAPI()


@app.get("/items/")
async def read_items(
    strange_header: Annotated[str | None, Header(convert_underscores=False)] = None,
):