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Yii2+Swagger搭建RESTful风格的API项目

在现有的Advanced Template上搭建RESTful API项目的步骤:

本案例前提说明:

  • 本例中不使用/yii/rest/ActiveController自动创建的API,而是自定义一个API
  • 使用Auth2.0的Bearer模式进行身份验证
  • 使用MongoDB作为数据库,关于如何在Yii2中使用mongodb,请参考其他资料
  • 本例中将使用Yii2的RESTful Rate Limiting功能对API进行访问频率控制
  • 本例使用Swagger-UI生成公开的接口文档
  • 本例中,API的请求将使用秘钥对请求参数进行签名,签名参数sign将作为url的最后一部分,服务端将使用相同的签名方式进行签名并匹配sign的值,以确定访问是否被伪造

创建新项目myapi以及模块v1的步骤:

Step 1 - 添加一个新的API项目,名为myapi: 参考教程

Step 2 - 创建一个名为v1的Module,创建之后项目结构如下:

Yii2+Swagger搭建RESTful风格的API项目

注: 本例中models均放在myapi/models/v1下,也可以直接将models放在myapi/modules/v1/models下

Step 3 - 将创建的Module v1 添加到配置文件myapi/config/main.php中:

return [
    ...
    'modules' => [
        'v1' => [
            'class' => 'myapi/modules/v1/Module'
        ],
    ]
    ...
];

创建数据库以及ActiveRecord:

本例中,数据库包含以下两张表external_api_users(API的用户表)、external_api_settings(Rate Limiting设置表):

external_api_users数据结构如下:

{
    "_id" : ObjectId("57ac16a3c05b39f9f6bf06a0"),
    "userName" : "danielfu",
    "avatar" : "http://www.xxx.com/avatar/default.png",
    "authTokens" : [ 
        "abcde",  // token可以同时存在多个
        "12345"
    ],
    "apiKeyInfos" : {
        "apiKey" : "apikey-123",
        "publicKey" : "publickey-123",
        "secreteKey" : "secreteKey-123" // 用来对sign进行签名
    },
    "status" : "active",
    "isDeleted" : false
}

external_api_settings数据结构如下:

{
    "_id" : ObjectId("57ac16a81c35b1a5603c9869"),
    "userID" : "57ac16a3c05b39f9f6bf06a0", // 关联到external_api_users._id字段
    "apiURL" : "/v1/delivery/order-sheet",
    "rateLimit" : NumberLong(2), // 只能访问2次
    "duration" : NumberLong(10), // rateLimit的限制是10秒之内
    "allowance" : NumberLong(1), // 当前在固定时间内剩余的可访问次数为1次
    "allowanceLastUpdateTime" : NumberLong(1470896430) // 最后一次访问时间
}

注意:本例使用的是Mongodb作为数据库,因此表结构表示为json格式

Step 1 - 创建ExternalApiUser类:

use yii/mongodb/ActiveRecord;
use yii/filters/RateLimitInterface;
use yii/web/IdentityInterface;

// 要实现Rate Limiting功能,就需要实现 /yii/filters/RateLimitInterface 接口
class ExternalApiUser extends ActiveRecord implements RateLimitInterface, IdentityInterface 
{
    ...
    
    public function getRateLimit($request, $action)
    {
        return /myapi/models/v1/ExternalApiSettings::getRateLimit((string)$this->_id, $action->controller->module->module->requestedRoute);
    }

    public function loadAllowance($request, $action)
    {
        return /myapi/models/v1/ExternalApiSettings::loadAllowance((string)$this->_id, $action->controller->module->module->requestedRoute);
    }

    public function saveAllowance($request, $action, $allowance, $timestamp)
    {
        return /myapi/models/v1/ExternalApiSettings::saveAllowance((string)$this->_id, $action->controller->module->module->requestedRoute, $allowance, $timestamp);
    }
    
    ...
}

Step 2 - 创建ExternalApiSettings类:

class ExternalApiSettings extends /yii/mongodb/ActiveRecord
{
    ...
    public static function getRateLimit($userID, $apiUrl)
    {
        if (empty($userID) || empty($apiUrl)) {
            throw  new InvalidParamException('Parameter UserID and ApiURL is required!');
        }

        $setting = self::findOne(['userID' => $userID, 'apiURL' => $apiUrl]);
        if ($setting == null) {
            $setting = new self();
            $setting->userID = $userID;
            $setting->apiURL = $apiUrl;
            $setting->rateLimit = /Yii::$app->params['rateLimiting']['rateLimit'];
            $setting->duration = /Yii::$app->params['rateLimiting']['duration'];
            $setting->allowance = /Yii::$app->params['rateLimiting']['rateLimit'];
            $setting->save();
        }

        return [$setting->rateLimit, $setting->duration];
    }

    public static function loadAllowance($userID, $apiUrl)
    {
        if (empty($userID) || empty($apiUrl)) {
            throw  new InvalidParamException('Parameter UserID and ApiURL is required!');
        }

        $setting = self::findOne(['userID' => $userID, 'apiURL' => $apiUrl]);
        if ($setting != null) {
            return [$setting->allowance, $setting->allowanceLastUpdateTime];
        }
    }

    public static function saveAllowance($userID, $apiUrl, $allowance, $allowanceLastUpdateTime)
    {
        if (empty($userID) || empty($apiUrl)) {
            throw  new InvalidParamException('Parameter UserID and ApiURL is required!');
        }

        $setting = self::findOne(['userID' => $userID, 'apiURL' => $apiUrl]);
        if ($setting != null) {
            $setting->allowance = $allowance;
            $setting->allowanceLastUpdateTime = $allowanceLastUpdateTime;
            $setting->save();
        }
    }
    ...
}

Step 3 - 在 /myapi/config/main.php 文件中配置用户身份认证类为刚才创建的ExternalApiUser类:

return [
    ...
    'components' => [
        ...
        'user' => [
            'identityClass' => 'myapi/models/v1/ExternalApiUser',
            'enableAutoLogin' => true,
        ]
        ...
    ]
    ...
];

创建RESTful API:

Step 1 - 在myapi/modules/v1/controllers下创建controller,名为DeliveryController:

// 特别注意的是需要将/yii/web/ActiveController改为/yii/rest/ActiveController
class DeliveryController extends /yii/rest/ActiveController
{
    // $modelClass是/yii/rest/ActiveController必须配置的属性,但是本例中我们不需要使用基于ActiveRecord快速生成的API接口,因此对应$modelClass属性的设置并没什么用处
    public $modelClass = 'myapi/models/v1/request/delivery/OrderSheetRequest';
    
    /* 
    /yii/rest/ActiveController会对应于$modelClass绑定的ActiveRecord快速生成如下API:
        GET /deliveries: list all deliveries page by page;
        HEAD /deliveries: show the overview information of deliveries listing;
        POST /deliveries: create a new delivery;
        GET /deliveries/123: return the details of the delivery 123;
        HEAD /deliveries/123: show the overview information of delivery 123;
        PATCH /deliveries/123 and PUT /users/123: update the delivery 123;
        DELETE /deliveries/123: delete the delivery 123;
        OPTIONS /deliveries: show the supported verbs regarding endpoint /deliveries;
        OPTIONS /deliveries/123: show the supported verbs regarding endpoint /deliveries/123.
    */
    ...
}

Step 2 - 将DeliveryController的身份验证模式改为Auth2.0的Bearer模式,并开启RESTful Rate Limiting功能:

class DeliveryController extends /yii/rest/ActiveController
{
    ...
    public function behaviors()
    {
        $behaviors = parent::behaviors();
        
        // 身份验证模式改为Auth2.0的Bearer模式
        $behaviors['authenticator'] = [
            'class' => /yii/filters/auth/HttpBearerAuth::className(),
        ];

        // 开启RESTful Rate Limiting功能
        $behaviors['rateLimiter']['enableRateLimitHeaders'] = true;

        ...
        
        return $behaviors;
    }
    ...
}

Step 3 - 创建自定义action,名为actionOrderSheet:

public function actionOrderSheet()
{
    ...
}

Step 4 - 在 /myapi/config/main.php 文件中配置自定义路由:

return [
    ...
    'components' => [
            'urlManager' => [
            'enablePrettyUrl' => true,
            'enableStrictParsing' => true,
            'showScriptName' => false,
            'rules' => [
                // 这一条配置是为了生成Swagger.json文档所预留的API,使用的还是基本的/yii/web/UrlRule
                [
                    'class' => 'yii/web/UrlRule',
                    'pattern' => 'site/gen-swg',
                    'route' => 'site/gen-swg'
                ],
                /* 这一条配置是配置自定义的RESTful API路由
                 本例中,我们的url将会是如下格式: http://www.xxx.com/v1/delivery/order-sheet/sn1001/c0bb9cfe4fdcc5ee0a4237b6601d1df4
                 其中,sn1001为shipping-number参数,c0bb9cfe4fdcc5ee0a4237b6601d1df4为sign参数
                */
                [
                    'class' => 'yii/rest/UrlRule',
                    'controller' => 'v1/delivery',
                    'pluralize' => false, // 不需要将delivery自动转换成deliveries
                    'tokens' => [
                        '{shipping-number}' => '<shipping-number://w+>',
                        '{sign}' => '<sign://w+>'
                    ],
                    'extraPatterns' => [
                        'POST order-sheet/{shipping-number}/{sign}' => 'order-sheet',
                    ],
                ]
            ],
        ],
    ],
    ...
];

到这里为止, http://www.xxx.com/v1/delivery/order-sheet/sn1001/c0bb9cfe4fdcc5ee0a4237b6601d1df4 已经可以被请求了,接下来我们通过Swagger将API接口公布出来,以便给他人调用。

集成Swagger:

Step 1 - 从https://github.com/swagger-api/swagger-ui/releases 下载Swagger-UI,并放到项目web目录下,同时可以创建一个swagger-docs目录用以存放swagger.json文件:

Yii2+Swagger搭建RESTful风格的API项目

Step 2 - 在composer.json的required节点中添加zircote/swagger-php配置:

"requried": {
...
"zircote/swagger-php": "*", // 添加之后应该执行composer update命令安装该组件
...
}

Step 3 - 用Annotation语法标注actionOrderSheet方法,部分代码如下:

/**
     * @SWG/Post(path="/delivery/order-sheet/{shippingNumber}/{sign}",
     *   tags={"Delivery"},
     *   summary="Sync order sheet result from warehouse to Glitzhome",
     *   description="从仓库同步发货结果",
     *   operationId="delivery/order-sheet",
     *   produces={"application/xml", "application/json"},
     *   @SWG/Parameter(
     *     name="shippingNumber",
     *     in="path",
     *     description="Shipping Number",
     *     required=true,
     *     type="string"
     *   ),
     *   @SWG/Parameter(
     *     name="sign",
     *     in="path",
     *     description="Sign of request parameters",
     *     required=true,
     *     type="string"
     *   ),
     *   @SWG/Parameter(
     *     name="Authorization",
     *     in="header",
     *     description="授权Token,Bearer模式",
     *     required=true,
     *     type="string"
     *   ),
     *   @SWG/Parameter(
     *     in="body",
     *     name="orderSheet",
     *     description="仓库反馈的Order sheet的结果",
     *     required=true,
     *     type="array",
     *     @SWG/Schema(ref="#/definitions/OrderSheetRequest")
     *   ),
     *
     *   @SWG/Response(response=200, @SWG/Schema(ref="#/definitions/OrderSheetResponse"), description="successful operation"),
     *   @SWG/Response(response=400,description="Bad request"),
     *   @SWG/Response(response=401,description="Not authorized"),
     *   @SWG/Response(response=404,description="Method not found"),
     *   @SWG/Response(response=405,description="Method not allowed"),
     *   @SWG/Response(response=426,description="Upgrade required"),
     *   @SWG/Response(response=429,description="Rate limit exceeded"),
     *   @SWG/Response(response=499,description="Customized business errors"),
     *   @SWG/Response(response=500,description="Internal Server Error"),
     *   security={
     *     {"Authorization": {}},
     *   }
     * )
     *
     */
    public function actionOrderSheet()
    {
        ...
    }

实际使用中,需要通过Swagger Annotation生成完整的swagger.json文件,否则swagger-ui在解析时会出错而导致无法生成API文档。

Step 4 - 在SiteController中增加actionGenSwg方法,用来解析Swagger Annotation并生成swagger.json文件:

public function actionGenSwg()
{
    $projectRoot = Yii::getAlias('@myapiroot') . '/myapi';
    $swagger = /Swagger/scan($projectRoot);
    $json_file = $projectRoot . '/web/swagger-docs/swagger.json';
    $is_write = file_put_contents($json_file, $swagger);
    if ($is_write == true) {
        $this->redirect('/swagger-ui/dist/index.html');
    }
}

Step 5 - 在文件 /myapi/config/bootstrap.php 中定义 ‘@myapiroot’:

...
Yii::setAlias('myapiroot', dirname(dirname(__DIR__)));
...

通过Swagger-UI查看并测试API:

Step 1 - 在浏览器中打开 http://www.xxx.com/site/gen-swg

页面,Swagger-UI将会根据swagger-json文件生成如下界面:

Yii2+Swagger搭建RESTful风格的API项目

Step 2 - 在参数位置按要求填写参数,点击"试一下!"按钮:

Yii2+Swagger搭建RESTful风格的API项目

Step 3 - 返回调用结果:

Yii2+Swagger搭建RESTful风格的API项目

我们本例中使用Rate Limiting进行访问频率的限制,假设设置了该API每10秒之内最多访问2次,如果我们连续点击"试一下!"按钮,则会返回429 Rate limit exceeded错误:

Yii2+Swagger搭建RESTful风格的API项目

注:由于代码是在正式项目中的,因此无法直接提供完整的源码,请见谅。

最后附上签名的算法:

public static function validateSign($parameters, $secretCode)
{
    if (is_array($parameters) && !empty($secretCode)) {
        // 顺序排序
        ksort($parameters);

        // 将 sign 添加到最后
        $paramsWithSecret = array_merge($parameters, ["secret" => $secretCode]);

        // 连接成 key1=value&key2=value2....keyN=valueN&secret=secretCode 这样的格式
        $str = implode('&', array_map(
            function ($v, $k) {
                return sprintf("%s=%s", $k, json_encode($v));
            },
            $paramsWithSecret,
            array_keys($paramsWithSecret)
        ));

        // 计算MD5的值
        return md5($str);
    }

    return '';
}

在线参考文档

  • http://budiirawan.com/setup-restful-api-yii2/
  • Yii2 RESTful Rate Limiting
  • Swagger UI
  • Swagger在线语法解释器
  • Swagger在线语法验证工具
  • Swagger Annotations语法
  • Swagger for PHP Demo
原文  http://www.cnblogs.com/wushangjue/p/5788117.html
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