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docs/guide-zh-CN/rest-authentication.md

-Authentication
 认证
 ==============
 
-Unlike Web applications, RESTful APIs are usually stateless, which means sessions or cookies should not
-be used. Therefore, each request should come with some sort of authentication credentials because
-the user authentication status may not be maintained by sessions or cookies. A common practice is
-to send a secret access token with each request to authenticate the user. Since an access token
-can be used to uniquely identify and authenticate a user, **API requests should always be sent
-via HTTPS to prevent man-in-the-middle (MitM) attacks**.
 和Web应用不同，RESTful APIs 通常是无状态的，也就意味着不应使用sessions 或 cookies，
 因此每个请求应附带某种授权凭证，因为用户授权状态可能没通过sessions 或 cookies维护，
 常用的做法是每个请求都发送一个秘密的access token来认证用户，由于access token可以唯一识别和认证用户，
 **API 请求应通过HTTPS来防止man-in-the-middle (MitM) 中间人攻击**.
 
-There are different ways to send an access token:
 下面有几种方式来发送access token：
 
-* [HTTP Basic Auth](http://en.wikipedia.org/wiki/Basic_access_authentication): the access token
-  is sent as the username. This should only be used when an access token can be safely stored
-  on the API consumer side. For example, the API consumer is a program running on a server.
 * [HTTP 基本认证](http://en.wikipedia.org/wiki/Basic_access_authentication): access token
   当作用户名发送，应用在access token可安全存在API使用端的场景，例如，API使用端是运行在一台服务器上的程序。
-* Query parameter: the access token is sent as a query parameter in the API URL, e.g.,
-  `https://example.com/users?access-token=xxxxxxxx`. Because most Web servers will keep query
-  parameters in server logs, this approach should be mainly used to serve `JSONP` requests which
-  cannot use HTTP headers to send access tokens.
 * 请求参数: access token 当作API URL请求参数发送，例如
   `https://example.com/users?access-token=xxxxxxxx`，由于大多数服务器都会保存请求参数到日志，
   这种方式应主要用于`JSONP` 请求，因为它不能使用HTTP头来发送access token 
 * [OAuth 2](http://oauth.net/2/): 使用者从认证服务器上获取基于OAuth2协议的access token，然后通过
   [HTTP Bearer Tokens](http://tools.ietf.org/html/rfc6750) 发送到API 服务器。
 
-Yii supports all of the above authentication methods. You can also easily create new authentication methods.
 Yii 支持上述的认证方式，你也可很方便的创建新的认证方式。
 
-To enable authentication for your APIs, do the following steps:
 为你的APIs启用认证，做以下步骤：
 
-1. Configure the `user` application component:
-   - Set the [[yii\web\User::enableSession|enableSession]] property to be `false`.
-   - Set the [[yii\web\User::loginUrl|loginUrl]] property to be `null` to show a HTTP 403 error instead of redirecting to the login page. 
-2. Specify which authentication methods you plan to use by configuring the `authenticator` behavior
-   in your REST controller classes.
-3. Implement [[yii\web\IdentityInterface::findIdentityByAccessToken()]] in your [[yii\web\User::identityClass|user identity class]].
 1. 配置`user` 应用组件:
    - 设置 [[yii\web\User::enableSession|enableSession]] 属性为 `false`.
    - 设置 [[yii\web\User::loginUrl|loginUrl]] 属性为`null` 显示一个HTTP 403 错误而不是跳转到登录界面. 
 2. 在你的REST 控制器类中配置`authenticator` 行为来指定使用哪种认证方式
 3. 在你的[[yii\web\User::identityClass|user identity class]] 类中实现 [[yii\web\IdentityInterface::findIdentityByAccessToken()]] 方法.
 
-Step 1 is not required but is recommended for RESTful APIs which should be stateless. When [[yii\web\User::enableSession|enableSession]]
-is false, the user authentication status will NOT be persisted across requests using sessions. Instead, authentication
-will be performed for every request, which is accomplished by Step 2 and 3.
 步骤1不是必要的，但是推荐配置，因为RESTful APIs应为无状态的，当[[yii\web\User::enableSession|enableSession]]为false，
 请求中的用户认证状态就不能通过session来保持，每个请求的认证通过步骤2和3来实现。
 
-> Tip: You may configure [[yii\web\User::enableSession|enableSession]] of the `user` application component
-  in application configurations if you are developing RESTful APIs in terms of an application. If you develop
-  RESTful APIs as a module, you may put the following line in the module's `init()` method, like the following:
 > 提示: 如果你将RESTful APIs作为应用开发，可以设置应用配置中 `user` 组件的[[yii\web\User::enableSession|enableSession]]，
   如果将RESTful APIs作为模块开发，可以在模块的 `init()` 方法中增加如下代码，如下所示：
 
@@ -69,7 +40,6 @@ public function init()
 }
 ```
 
-For example, to use HTTP Basic Auth, you may configure the `authenticator` behavior as follows,
 例如，为使用HTTP Basic Auth，可配置`authenticator` 行为，如下所示：
 
 ```php
@@ -85,7 +55,6 @@ public function behaviors()
 }
 ```
 
-If you want to support all three authentication methods explained above, you can use `CompositeAuth` like the following,
 如果你系那个支持以上3个认证方式，可以使用`CompositeAuth`，如下所示：
 
 ```php
@@ -109,13 +78,9 @@ public function behaviors()
 }
 ```
 
-Each element in `authMethods` should be an auth method class name or a configuration array.
 `authMethods` 中每个单元应为一个认证方法名或配置数组。
 
 
-Implementation of `findIdentityByAccessToken()` is application specific. For example, in simple scenarios
-when each user can only have one access token, you may store the access token in an `access_token` column
-in the user table. The method can then be readily implemented in the `User` class as follows,
 `findIdentityByAccessToken()`方法的实现是系统定义的，
 例如，一个简单的场景，当每个用户只有一个access token, 可存储access token 到user表的`access_token`列中，
 方法可在`User`类中简单实现，如下所示：
@@ -134,31 +99,18 @@ class User extends ActiveRecord implements IdentityInterface
 }
 ```
 
-After authentication is enabled as described above, for every API request, the requested controller
-will try to authenticate the user in its `beforeAction()` step.
 在上述认证启用后，对于每个API请求，请求控制器都会在它的`beforeAction()`步骤中对用户进行认证。
 
-If authentication succeeds, the controller will perform other checks (such as rate limiting, authorization)
-and then run the action. The authenticated user identity information can be retrieved via `Yii::$app->user->identity`.
 如果认证成功，控制器再执行其他检查(如频率限制，操作权限)，然后再执行操作，
 授权用户信息可使用`Yii::$app->user->identity`获取.
 
-If authentication fails, a response with HTTP status 401 will be sent back together with other appropriate headers
-(such as a `WWW-Authenticate` header for HTTP Basic Auth).
 如果认证失败，会发送一个HTTP状态码为401的响应，并带有其他相关信息头(如HTTP 基本认证会有`WWW-Authenticate` 头信息).
 
 
-## Authorization <a name="authorization"></a>
 ## 授权 <a name="authorization"></a>
 
-After a user is authenticated, you probably want to check if he or she has the permission to perform the requested
-action for the requested resource. This process is called *authorization* which is covered in detail in
-the [Authorization section](security-authorization.md).
 在用户认证成功后，你可能想要检查他是否有权限执行对应的操作来获取资源，这个过程称为 *authorization* ，
 详情请参考 [Authorization section](security-authorization.md).
 
-If your controllers extend from [[yii\rest\ActiveController]], you may override
-the [[yii\rest\Controller::checkAccess()|checkAccess()]] method to perform authorization check. The method
-will be called by the built-in actions provided by [[yii\rest\ActiveController]].
 如果你的控制器从[[yii\rest\ActiveController]]类继承，可覆盖 [[yii\rest\Controller::checkAccess()|checkAccess()]] 方法
 来执行授权检查，该方法会被[[yii\rest\ActiveController]]内置的操作调用。