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")
def read_current_user(current_user: User | None = Depends(get_current_user)):

为了解决这个问题，我们首先将 `username` 和 `password` 转换为使用 UTF-8 编码的 `bytes` 。

然后我们可以使用 `secrets.compare_digest()` 来确保 `credentials.username` 是 `"stanleyjobson"`，且 `credentials.password` 是`"swordfish"`。

{* ../../docs_src/security/tutorial007_an_py310.py hl[1,12:24] *}

这类似于：

```Python
if not (credentials.username == "stanleyjobson") or not (credentials.password == "swordfish"):

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


def fake_decode_token(token):
    return User(
        username=token + "fakedecoded", email="******@****.***", full_name="John Doe"
    )

        private final String username;
        private final String password;

        public TestLoginCredential(String username, String password) {
            this.username = username;
            this.password = password;
        }

        public String getUsername() {
            return username;
        }

        public String getPassword() {
            return password;

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


class User(BaseModel):
    username: str
    email: str | None = None
    full_name: str | None = None
    disabled: bool | None = None


def fake_decode_token(token):
    return User(
        username=token + "fakedecoded", email="******@****.***", full_name="John Doe"
    )

                                    <label for="username" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.webauth_username"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="username"/>
                                        <la:text styleId="username" property="username" styleClass="form-control"/>

from fastapi import FastAPI, Form

app = FastAPI()


@app.post("/login/")
async def login(username: str = Form(), password: str = Form()):

# 패스워드와 Bearer를 이용한 간단한 OAuth2 { #simple-oauth2-with-password-and-bearer }

이제 이전 장에서 빌드하고 누락된 부분을 추가하여 완전한 보안 흐름을 갖도록 하겠습니다.

## `username`와 `password` 얻기 { #get-the-username-and-password }

**FastAPI** 보안 유틸리티를 사용하여 `username` 및 `password`를 가져올 것입니다.

OAuth2는 (우리가 사용하고 있는) "패스워드 플로우"을 사용할 때 클라이언트/유저가 `username` 및 `password` 필드를 폼 데이터로 보내야 함을 지정합니다.

그리고 사양에는 필드의 이름을 그렇게 지정해야 한다고 나와 있습니다. 따라서 `user-name` 또는 `email`은 작동하지 않습니다.

     * @param form the form containing the request header data
     * @param username the username of the user performing the operation
     * @param currentTime the current timestamp
     * @return optional entity containing the request header data, or empty if creation fails
     */
    public static OptionalEntity<RequestHeader> getEntity(final CreateForm form, final String username, final long currentTime) {
        switch (form.crudMode) {

     *
     * @param form the create form
     * @param username the current username
     * @param currentTime the current time
     * @return optional file authentication entity
     */
    public static OptionalEntity<FileAuthentication> getEntity(final CreateForm form, final String username, final long currentTime) {
        switch (form.crudMode) {
        case CrudMode.CREATE: