app = FastAPI()


def verify_password(plain_password, hashed_password):
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password):
    return pwd_context.hash(password)


def get_user(db, username: str):
    if username in db:
        user_dict = db[username]
        return UserInDB(**user_dict)

!!! danger "Gefahr"
    Speichern Sie niemals das Klartext-Passwort eines Benutzers. Speichern Sie immer den „sicheren Hash“, den Sie verifizieren können.

    Falls Ihnen das nichts sagt, in den [Sicherheits-Kapiteln](security/simple-oauth2.md#passwort-hashing){.internal-link target=_blank} werden Sie lernen, was ein „Passwort-Hash“ ist.

## Mehrere Modelle

    assert verify_password("secret", fake_users_db["johndoe"]["hashed_password"])


@needs_py39
def test_get_password_hash():
    from docs_src.security.tutorial005_an_py39 import get_password_hash

    assert get_password_hash("secretalice")


@needs_py39
def test_create_access_token():
    from docs_src.security.tutorial005_an_py39 import create_access_token

    assert verify_password("secret", fake_users_db["johndoe"]["hashed_password"])


@needs_py310
def test_get_password_hash():
    from docs_src.security.tutorial005_py310 import get_password_hash

    assert get_password_hash("secretalice")


@needs_py310
def test_create_access_token():
    from docs_src.security.tutorial005_py310 import create_access_token

例えば`dict`が下記のようになっていた場合:

```Python
{
    "username": "johndoe",
    "hashed_password": "some_hash",
}
```

`UserInDB`には次のように渡されます:

```Python
UserInDB(username="johndoe", hashed_password="some_hash")
```

## **FastAPI** コードの実装

### `FastAPI` app の作成

```Python hl_lines="46"
{!../../../docs_src/nosql_databases/tutorial001.py!}
```

        "full_name": "Alice Wonderson",
        "email": "******@****.***",
        "hashed_password": "fakehashedsecret2",
        "disabled": True,
    },
}

app = FastAPI()


def fake_hash_password(password: str):
    return "fakehashed" + password


oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


class User(BaseModel):
    username: str
    email: Union[str, None] = None

        "full_name": "Alice Wonderson",
        "email": "******@****.***",
        "hashed_password": "fakehashedsecret2",
        "disabled": True,
    },
}

app = FastAPI()


def fake_hash_password(password: str):
    return "fakehashed" + password


oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


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

        "full_name": "Alice Wonderson",
        "email": "******@****.***",
        "hashed_password": "fakehashedsecret2",
        "disabled": True,
    },
}

app = FastAPI()


def fake_hash_password(password: str):
    return "fakehashed" + password


oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")


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

    return DBUser(name="John", surname="Doe", password_hash="secret")


@app.get("/response_model_list_of_model-no_annotation", response_model=List[User])
def response_model_list_of_model_no_annotation():
    return [
        DBUser(name="John", surname="Doe", password_hash="secret"),
        DBUser(name="Jane", surname="Does", password_hash="secret2"),
    ]

    {!> ../../../docs_src/extra_models/tutorial005.py!}
    ```

## 小结

针对不同场景，可以随意使用不同的 Pydantic 模型继承定义的基类。