return
		}
		for user := range users {
			checkedUserList = append(checkedUserList, user)
		}
		checkedUserList = append(checkedUserList, globalActiveCred.AccessKey)
	} else {
		for _, user := range users {
			// Validate the user
			_, ok := globalIAMSys.GetUser(ctx, user)
			if !ok {
				continue
			}
			checkedUserList = append(checkedUserList, user)
		}
	}

///

```Python hl_lines="10"
{!> ../../docs_src/security/tutorial001.py!}
```

////

But that is still not that useful.

Let's make it give us the current user.

## Create a user model

First, let's create a Pydantic user model.

The same way we use Pydantic to declare bodies, we can use it anywhere else:

//// tab | Python 3.10+

```Python hl_lines="5  12-16"

	if s3Err != ErrNone {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL)
		return
	}

	userDN := r.Form.Get("userDN")

	// If listing is requested for a specific user (who is not the request
	// sender), check that the user has permissions.
	if userDN != "" && userDN != cred.ParentUser {
		if !globalIAMSys.IsAllowed(policy.Args{
			AccountName:     cred.AccessKey,
			Groups:          cred.Groups,

```JSON
{
  "detail": "Not authenticated"
}
```

### Inactive user

Now try with an inactive user, authenticate with:

User: `alice`

Password: `secret2`

And try to use the operation `GET` with the path `/users/me`.

You will get an "Inactive user" error, like:

```JSON
{
  "detail": "Inactive user"
}
```

## Recap

That way, you can create a token with an expiration of, let's say, 1 week. And then when the user comes back the next day with the token, you know that user is still logged in to your system.

	mappedPolicies := make([]MappedPolicy, len(users))
	g := errgroup.WithNErrs(len(users))

	for index := range users {
		index := index
		g.Go(func() error {
			userName := strings.TrimSuffix(users[index], ".json")
			userMP, err := iamOS.loadMappedPolicyInternal(ctx, userName, userType, isGroup)

## 获取用户

`get_current_user` 使用创建的（伪）工具函数，该函数接收 `str` 类型的令牌，并返回 Pydantic 的 `User` 模型：

```Python hl_lines="19-22  26-27"
{!../../docs_src/security/tutorial002.py!}
```

## 注入当前用户

在*路径操作* 的 `Depends` 中使用 `get_current_user`：

```Python hl_lines="31"
{!../../docs_src/security/tutorial002.py!}
```

注意，此处把 `current_user` 的类型声明为 Pydantic 的 `User` 模型。

这有助于在函数内部使用代码补全和类型检查。

/// tip | "提示"

But in this case, the same **FastAPI** application will handle the API and the authentication.

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

* The user types the `username` and `password` in the frontend, and hits `Enter`.

		return nil, err
	}

	m.Range(func(user string, mappedPolicy MappedPolicy) bool {
		if userPredicate != nil && !userPredicate(user) {
			return true
		}
		stsMap[user] = mappedPolicy.Policies
		return true
	})

	for user := range store.getParentUsers(cache) {
		if _, ok := stsMap[user]; !ok {
			if userPredicate != nil && !userPredicate(user) {
				continue
			}
			stsMap[user] = ""

🕹 `items` 🔜 ✔️ 🔢 `router` (`items.router`). 👉 🎏 1️⃣ 👥 ✍ 📁 `app/routers/items.py`, ⚫️ `APIRouter` 🎚.

& ⤴️ 👥 🎏 🕹 `users`.

👥 💪 🗄 👫 💖:

```Python
from app.routers import items, users
```

/// info

🥇 ⏬ "⚖ 🗄":

```Python
from .routers import items, users
```

🥈 ⏬ "🎆 🗄":