amazon-web-services - 如何使用 AWS CloudFormation 在 AWS API Gateway 集成中指定阶段变量？

Question

我正在尝试构建 AWS CloudFormation 模板来创建 API 网关。
当我手动创建 API Gateway 时，我使用阶段变量为不同阶段使用不同的 AWS 函数。

例如。我有一个名为 adminLogin 的阶段变量，
adminLogin 的值将是 -
dev_adminLogin 当 API Gateway 的阶段为 dev
stage_adminLogin(当 API 网关的阶段为 stage

时)

API Gateway 的资源集成请求 -

阶段变量映射 -

CloudFormation 模板片段 -

test:
    Type: 'AWS::ApiGateway::RestApi'
    Properties:
      Name: 'test'
      Body:
        swagger: "2.0"
        info:
          version: "2019-04-11T02:29:18Z"
          title: "Test"
        basePath: !Ref "testEnv"
        schemes:
          - "https"
        paths:
          /admin/login:
            post:
              consumes:
                - "application/json"
              produces:
                - "application/json"
              responses:
                '200':
                  description: "200 response"
                  schema:
                    $ref: "#/definitions/Empty"
              x-amazon-apigateway-integration:
                #uri: !Sub "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${stageVariables.adminLogin}/invocations"
                uri: !Join [
                    '', [
                      'arn:',
                      'aws:',
                      'apigateway:',
                      !Ref "AWS::Region",
                      ':lambda:',
                      'path/2015-03-31/functions/',
                      '${stageVariables.adminLogin}',
                      '/invocations'
                    ]
                  ]
                responses:
                  default:
                    statusCode: "200"
                passthroughBehavior: "when_no_templates"
                httpMethod: "POST"
                contentHandling: "CONVERT_TO_TEXT"
                type: "aws_proxy"

运行 cloudformation 模板时出现以下错误 -

Errors found during import: Unable to put integration on 'POST' for resource at path '/admin/login': Invalid lambda function 
(Service: AmazonApiGateway; 
Status Code: 400; 
Error Code: BadRequestException; 

问题肯定出在 uri 属性上，
我都尝试过 -

uri: !Sub "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${stageVariables.adminLogin}/invocations"

和

uri: !Join ['', ['arn:','aws:','apigateway:',!Ref "AWS::Region",':lambda:','path/2015-03-31/functions/','${!stageVariables.adminLogin}','/invocations']]

引用-

1. https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-apitgateway-method-integration.html#cfn-apigateway-method-integration-uri
   
2. https://docs.aws.amazon.com/apigateway/latest/developerguide/amazon-api-gateway-using-stage-variables.html

Answer 1

应使用 Lambda ARN(而不仅仅是 Lambda 函数名称)提及 Lambda 函数

例如:

uri: "arn:aws:apigateway:REGION:lambda:path/2015-03-31/functions/arn:aws:lambda:REGION:ACCOUNTID:function:dev_adminLogin/invocations"

按如下方式将其放在 cloudformation 中应该可以工作

uri: !Join
      - ''
      - - 'arn:aws:apigateway:'
        - !Ref "AWS::Region"
        - ':lambda:path/2015-03-31/functions/arn:aws:lambda:'
        - !Ref "AWS::Region"
        - ':'
        - !Ref "AWS::AccountId"
        - ':function:${stageVariables.adminLogin}/invocations'

还要记住添加 lambda 权限(对于 dev_adminLogin 和 stage_adminLogin)，否则 apigateway 将无法调用 lambda 并会收到 5XX 错误

使用 CLI:

aws lambda add-permission  --function-name "arn:aws:lambda:REGION:ACCOUNTID:function:dev_adminLogin"    --source-arn "arn:aws:execute-api:REGION:ACCOUNTID:API_ID/*/POST/admin/login"    --principal apigateway.amazonaws.com    --statement-id stmt1    --action lambda:InvokeFunction

aws lambda add-permission  --function-name "arn:aws:lambda:REGION:ACCOUNTID:function:stage_adminLogin"    --source-arn "arn:aws:execute-api:REGION:ACCOUNTID:API_ID/*/POST/admin/login"    --principal apigateway.amazonaws.com    --statement-id stmt2    --action lambda:InvokeFunction

引用号:https://docs.aws.amazon.com/cli/latest/reference/lambda/add-permission.html