如何在模板之间共享授权人而不达到每个 API 的授权人限制

Question

我有十几个服务，每个服务都有自己的无服务器模板文件，在 API Gateway 上共享相同的根 API。我的根serverless.yml文件定义了 API 和授权者：

...
resources:
  Resources:
    ApiGatewayRestApi:
      Type: AWS::ApiGateway::RestApi
      Properties:
        Name: ${self:service.name}-${self:provider.stage}
        Description: Medimap API Gateway
    GatewayResponseDefault4XX:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        ResponseParameters:
          gatewayresponse.header.Access-Control-Allow-Origin: "'*'"
          gatewayresponse.header.Access-Control-Allow-Headers: "'*'"
        ResponseType: DEFAULT_4XX
        RestApiId:
          Ref: "ApiGatewayRestApi"

  Outputs:
    RestApiId:
      Value:
        Ref: ApiGatewayRestApi
      Export:
        Name: ${self:service.name}-${self:provider.stage}-RestApiId
    RootResourceId:
      Value:
        Fn::GetAtt: ApiGatewayRestApi.RootResourceId
      Export:
        Name: ${self:service.name}-${self:provider.stage}-ApiGatewayRestApiRootResourceId
    AuthenticationService:
      Value:
        Fn::GetAtt: AuthenticationServiceLambdaFunction.Arn
      Export:
        Name: ${self:service.name}-${self:provider.stage}-AuthenticationService

functions:
  authenticationService:
    handler: src/api/common/authenticationService.handler
    environment:
      JWT_SECRET: ${env:JWT_SECRET}
    events:
      - http:
          path: authenticationService
          method: post
          cors: true

在我的每项服务的模板中，我都有如下代码：

provider:
  ...
  apiGateway:
    restApiId:
      "Fn::ImportValue": "medimap-api-${self:provider.stage}-RestApiId"
    restApiRootResourceId:
      "Fn::ImportValue": "medimap-api-${self:provider.stage}-ApiGatewayRestApiRootResourceId"

custom:
  authorizer:
    name: example-authorizer
    arn:
      Fn::ImportValue: medimap-api-${self:provider.stage}-AuthenticationService

functions:
  exampleFunction:
    handler: src/api/example/exampleFunction.handler
    events:
      - http:
          path: example/exampleFunction
          method: get
          cors: true
          authorizer: ${self:custom.authorizer}

这工作正常，但是一旦我部署了 10 个服务，尝试使用相同的授权者部署第 11 个服务就会出现以下错误：

Maximum number of Authorizers for this API has been reached.  Please contact AWS if you need additional Authorizers.

现在，我可以联系 AWS 来增加限制，但由于它们在技术上都是相同的授权者，我觉得应该有一种方法可以让它工作，而无需为每个模板文件创建单独的授权者。

我尝试对所有这些人使用相同的授权者名称，但最终收到错误：

Authorizer name must be unique. Authorizer example-authorizer already exists in this RestApi

有没有一种方法可以让我在同一 API 上的所有服务之间共享此授权者，而不必为每个服务创建一个新命名的授权者，这样我就不会达到此限制？

Answer 1

您可以共享授权者本身，而不是只共享每个（新）授权者的 Lambda 函数：

API网关堆栈：

resources:
  Resources:
    ApiGatewayRestApi:
      Type: AWS::ApiGateway::RestApi
      Properties:
        Name: ${self:service.name}-${self:provider.stage}
        Description: Medimap API Gateway
    GatewayResponseDefault4XX:
      Type: "AWS::ApiGateway::GatewayResponse"
      Properties:
        ResponseParameters:
          gatewayresponse.header.Access-Control-Allow-Origin: "'*'"
          gatewayresponse.header.Access-Control-Allow-Headers: "'*'"
        ResponseType: DEFAULT_4XX
        RestApiId:
          Ref: "ApiGatewayRestApi"
    ApiGatewayAuthorizer:
      Type: AWS::ApiGateway::Authorizer
      Properties:
        AuthorizerUri:
          Fn::Join:
            - ''
            - - 'arn:'
              - { Ref: AWS::Partition }
              - ":apigateway:"
              - { Ref: AWS::Region }
              - ":lambda:path/2015-03-31/functions/"
              - { 'Fn::GetAtt': [${self:service.name}-${self:provider.stage}-authenticationService, 'Arn'] }
              - "/invocations"
        IdentitySource: method.request.header.Authorization
        Name: LambdaAuthorizer
        RestApiId:
          Ref: ApiGatewayRestApi
        Type: TOKEN

  Outputs:
    RestApiId:
      Value:
        Ref: ApiGatewayRestApi
      Export:
        Name: ${self:service.name}-${self:provider.stage}-RestApiId
    RootResourceId:
      Value:
        Fn::GetAtt: ApiGatewayRestApi.RootResourceId
      Export:
        Name: ${self:service.name}-${self:provider.stage}-ApiGatewayRestApiRootResourceId
    AuthenticationService:
      Value:
        { Ref: ApiGatewayAuthorizer }
      Export:
        Name: ${self:service.name}-${self:provider.stage}-AuthenticationService

functions:
  authenticationService:
    handler: src/api/common/authenticationService.handler
    environment:
      JWT_SECRET: ${env:JWT_SECRET}
    events:
      - http:
          path: authenticationService
          method: post
          cors: true

在你的其他堆栈中：

functions:
  exampleFunction:
    handler: src/api/example/exampleFunction.handler
    events:
      - http:
          path: example/exampleFunction
          method: get
          cors: true
          authorizer:           
            type: TOKEN 
            authorizerId:
              Fn::ImportValue: medimap-api-${self:provider.stage}-AuthenticationService

这是根据内存 + CloudFormation 文档完成的，因此请原谅任何编译错误......

来源：

https://serverless.com/framework/docs/providers/aws/events/apigateway#share-authorizer