如何使用aws中的cloudformation请求api网关中的参数并将其传递给lambda函数？

Question

我正在尝试使用 AWS CloudFormation 中的 API Gateway 请求参数。我想从 API 网关传递给 Lambda 函数的参数是“action”。我已经尝试了以下代码，到目前为止我遇到了错误，如下所述。有人可以帮我确定问题和可能的解决方案吗？

“指定的映射表达式无效：验证结果：警告：[]，错误：[指定的映射表达式无效：Integration.request.path.action]（服务：AmazonApiGateway；状态代码：400；错误代码：BadRequestException；请求ID : 037f4753-52b5-4276-979a-131a0f903e63)"

AWSTemplateFormatVersion: "2010-09-09"
Description: "API Gateway and Lambda function"

Resources:
  SampleApi:
    Type: "AWS::ApiGateway::RestApi"
    Properties:
      Name: Sample

  SampleApiMethod:
    Type: "AWS::ApiGateway::Method"
    Properties:
      AuthorizationType: "NONE"
      HttpMethod: "GET"
      RequestParameters:
        method.request.path.action: true
      RequestTemplates:
        application/yaml
      Integration:
        IntegrationHttpMethod: "POST"
        Type: "AWS_PROXY"
        RequestParameters:
          Integration.request.path.action: method.request.path.action 
        Uri: !Sub
          - "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${lambdaArn}/invocations"
          - lambdaArn: !GetAtt "SampleLambda.Arn"
        CacheKeyParameters:
          - method.request.path.action
      ResourceId: !GetAtt "SampleApi.RootResourceId"
      RestApiId: !Ref "SampleApi"

  SampleApiDeployment:
    Type: "AWS::ApiGateway::Deployment"
    DependsOn: "SampleApiMethod"
    Properties:
      RestApiId: !Ref "SampleApi"
      StageName: test

  SampleLambda:
    Type: "AWS::Lambda::Function"
    Properties:
      Code:
        ZipFile: |
            import yaml
            import boto3
            cf_client = boto3.client('cloudformation')
            cf_client.create_stack(
                StackName='your-stack',
                TemplateURL='Some URL',
                Parameters=[
                    {
                        'ParameterKey':'action',
                        'ParameterValue': 'kms:*'
                    },
                ]
            )
      Handler: "index.handler"
      Role: !GetAtt "SampleLambdaRole.Arn"
      Runtime: python3.7

  LambdaApiGatewayInvoke:
    Type: "AWS::Lambda::Permission"
    Properties:
      Action: "lambda:InvokeFunction"
      FunctionName: !GetAtt "SampleLambda.Arn"
      Principal: "apigateway.amazonaws.com"
      SourceArn: !Sub "arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${SampleApi}/*/GET/"

  SampleLambdaRole:
    Type: "AWS::IAM::Role"
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Action: ["sts:AssumeRole"]
            Effect: "Allow"
            Principal:
              Service: ["lambda.amazonaws.com"]
      Policies:
        - PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Action: ["cloudwatch:*", "logs:*"]
                Effect: "Allow"
                Resource: "*"
          PolicyName: "lambdaLogPolicy"  
Outputs:
  apiGatewayInvokeURL:
    Value: !Sub 'https://Sample.execute-api.${AWS::Region}.amazonaws.com/test' 

Answer 1

根据文档，RequestParameters 的键应类似于 integration.request.<location>.<name>，integration 应为小写 i。您正在使用大写字母 I。来自AWS CloudFormation docs：

使用以下模式integration.request.location.name 指定目标，其中location 是查询字符串、路径或标头，name 是有效的唯一参数名称。

此外，您上面的模板包含一个 RequestTemplates 属性，该属性放置在错误的层次结构级别。如AWS CloudFormation docs 中所述，它必须位于Integration 下方。这是AWS::ApiGateway::Method 的正确模板：

SampleApiMethod:
  Type: "AWS::ApiGateway::Method"
  Properties:
    AuthorizationType: "NONE"
    HttpMethod: "GET"
    RequestParameters:
      method.request.path.action: true
    Integration:
      IntegrationHttpMethod: "POST"
      Type: "AWS_PROXY"
      RequestParameters:
        integration.request.path.action: method.request.path.action
      RequestTemplates:
        "application/yaml": "<define your template here>"
      Uri: !Sub
        - "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${lambdaArn}/invocations"
        - lambdaArn: !GetAtt "SampleLambda.Arn"
      CacheKeyParameters:
        - method.request.path.action
    ResourceId: !GetAtt "SampleApi.RootResourceId"
    RestApiId: !Ref "SampleApi"

有关定义请求模板的更多信息可以在developer reference中找到。