# 使用 Amazon CloudFormation 创建和配置 API 密钥和使用计划。
<a name="api-key-usage-plan-cfn"></a>

 您可以使用 Amazon CloudFormation 对于 API 方法要求 API 密钥并为 API 创建使用计划。示例 Amazon CloudFormation 模板执行以下操作：
+ 使用 `GET` 和 `POST` 方法创建 API Gateway API。
+ `GET` 和 `POST` 方法需要 API 密钥。此 API 从每个传入请求的 `X-API-KEY` 标头接收密钥。
+ 创建 API 密钥。
+ 创建使用计划，以指定每月限额为每月 1000 个请求，节流速率限制为每秒 100 个请求，而节流突增限制为每秒 200 个请求。
+ 为 `GET` 方法指定每秒 50 个请求的方法级节流速率限制和每秒 100 个请求的方法级节流突增限制。
+ 将 API 阶段和 API 密钥与使用计划关联。

```
AWSTemplateFormatVersion: 2010-09-09
Parameters:
  StageName:
    Type: String
    Default: v1
    Description: Name of API stage.
  KeyName:
    Type: String
    Default: MyKeyName
    Description: Name of an API key
Resources:
  Api:
    Type: 'AWS::ApiGateway::RestApi'
    Properties:
      Name: keys-api
      ApiKeySourceType: HEADER
  PetsResource:
    Type: 'AWS::ApiGateway::Resource'
    Properties:
      RestApiId: !Ref Api
      ParentId: !GetAtt Api.RootResourceId
      PathPart: 'pets'
  PetsMethodGet:
    Type: 'AWS::ApiGateway::Method'
    Properties:
      RestApiId: !Ref Api
      ResourceId: !Ref PetsResource
      HttpMethod: GET
      ApiKeyRequired: true
      AuthorizationType: NONE
      Integration:
        Type: HTTP_PROXY
        IntegrationHttpMethod: GET
        Uri: http://petstore-demo-endpoint.execute-api.com/petstore/pets/
  PetsMethodPost:
    Type: 'AWS::ApiGateway::Method'
    Properties:
      RestApiId: !Ref Api
      ResourceId: !Ref PetsResource
      HttpMethod: POST
      ApiKeyRequired: true
      AuthorizationType: NONE
      Integration:
        Type: HTTP_PROXY
        IntegrationHttpMethod: GET
        Uri: http://petstore-demo-endpoint.execute-api.com/petstore/pets/
  ApiDeployment:
    Type: 'AWS::ApiGateway::Deployment'
    DependsOn:
      - PetsMethodGet
    Properties:
      RestApiId: !Ref Api
      StageName: !Sub '${StageName}'
  UsagePlan:
    Type: AWS::ApiGateway::UsagePlan
    DependsOn:
      - ApiDeployment
    Properties:
      Description: Example usage plan with a monthly quota of 1000 calls and method-level throttling for /pets GET 
      ApiStages:
        - ApiId: !Ref Api
          Stage: !Sub '${StageName}'
          Throttle:
            "/pets/GET": 
              RateLimit: 50.0
              BurstLimit: 100
      Quota:
        Limit: 1000
        Period: MONTH
      Throttle:
        RateLimit: 100.0
        BurstLimit: 200
      UsagePlanName: "My Usage Plan"
  ApiKey:
    Type: AWS::ApiGateway::ApiKey
    Properties: 
      Description: API Key
      Name: !Sub '${KeyName}'
      Enabled: True
  UsagePlanKey:
    Type: AWS::ApiGateway::UsagePlanKey
    Properties:
      KeyId: !Ref ApiKey
      KeyType: API_KEY
      UsagePlanId: !Ref UsagePlan
Outputs:
  ApiRootUrl:
    Description: Root Url of the API
    Value: !Sub 'https://${Api}.execute-api.${AWS::Region}.amazonaws.com/${StageName}'
```