private int mainSize;
        private int inSize;
        private int outSize;

        TestSubSearcher(int mainSize, int inSize, int outSize) {
            this.mainSize = mainSize;
            this.inSize = inSize;
            this.outSize = outSize;
        }

        @Override

from fastapi import FastAPI, Security
from fastapi.security import OAuth2AuthorizationCodeBearer
from fastapi.testclient import TestClient

app = FastAPI()

oauth2_scheme = OAuth2AuthorizationCodeBearer(
    authorizationUrl="authorize", tokenUrl="token", auto_error=True
)


@app.get("/items/")
async def read_items(token: Optional[str] = Security(oauth2_scheme)):
    return {"token": token}


client = TestClient(app)

from fastapi import FastAPI, Security
from fastapi.security import OAuth2AuthorizationCodeBearer
from fastapi.testclient import TestClient

app = FastAPI()

oauth2_scheme = OAuth2AuthorizationCodeBearer(
    authorizationUrl="authorize",
    tokenUrl="token",
    description="OAuth2 Code Bearer",
    auto_error=True,
)


@app.get("/items/")
async def read_items(token: Optional[str] = Security(oauth2_scheme)):
    return {"token": token}

Sie werden etwa Folgendes sehen:

<img src="/img/tutorial/security/image01.png">

!!! check "Authorize-Button!"
    Sie haben bereits einen glänzenden, neuen „Authorize“-Button.

    Und Ihre *Pfadoperation* hat in der oberen rechten Ecke ein kleines Schloss, auf das Sie klicken können.

			for len(fieldBuf) >= 4 { // need at least tag and size
				attrTag := fieldBuf.uint16()
				attrSize := int(fieldBuf.uint16())
				if len(fieldBuf) < attrSize {
					continue parseExtras
				}
				attrBuf := fieldBuf.sub(attrSize)
				if attrTag != 1 || attrSize != 24 {
					continue // Ignore irrelevant attributes
				}

				const ticksPerSecond = 1e7    // Windows timestamp resolution

	size := 0
	// Figure out the data block length.
	for _, block := range enBlocks[:dataBlocks] {
		size += len(block)
	}
	return size
}

// Writes all the data blocks from encoded blocks until requested
// outSize length. Provides a way to skip bytes until the offset.
func writeDataBlocks(ctx context.Context, dst io.Writer, enBlocks [][]byte, dataBlocks int, offset int64, length int64) (int64, error) {
	// Offset and out size cannot be negative.

You will see something like this:

<img src="/img/tutorial/security/image01.png">

!!! check "Authorize button!"
    You already have a shiny new "Authorize" button.

    And your *path operation* has a little lock in the top-right corner that you can click.

界面如下图所示：

<img src="/img/tutorial/security/image01.png">

!!! check "Authorize 按钮！"

    页面右上角出现了一个「**Authorize**」按钮。

    *路径操作*的右上角也出现了一个可以点击的小锁图标。

点击 **Authorize** 按钮，弹出授权表单，输入 `username` 与 `password` 及其它可选字段：

<img src="/img/tutorial/security/image02.png">

!!! note "笔记"

    目前，在表单中输入内容不会有任何反应，后文会介绍相关内容。

    try {
      getList().listIterator(getNumElements() + 1);
      fail();
    } catch (IndexOutOfBoundsException expected) {
    }
  }

  public void testListIterator_atSize() {
    getList().listIterator(getNumElements());
    // TODO: run the iterator through ListIteratorTester
  }

  /**
   * Returns the {@link Method} instance for {@link #testListIterator_fullyModifiable()} so that

You'll see the user interface like:

<img src="/img/tutorial/security/image07.png">

Authorize the application the same way as before.

Using the credentials:

Username: `johndoe`
Password: `secret`

!!! check