如何引用 SAM 模板中定义的角色？

Question

我是 AWS SAM 模板的新手，希望能够使用一系列策略创建角色，然后为 Lambda 函数引用该角色。但是，当我尝试部署时出现以下错误：

'role' 处的值 'MyRole' 未能满足约束：成员必须满足正则表达式模式：arn:(aws[a-zA-Z-]*)?:iam::\d{12}:role/?[a -zA-Z_0-9+=,.@-_/]+

这个答案提到我可以将策略直接添加到函数中，但我会有很多需要相同策略的函数，所以这不是一个非常 DRY 的方法 IAM 模板中的 IAM 角色

是!GetAtt新创建的角色无法使用的问题吗？

这是我的template.yml样子：

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  OMW Backend Services

Globals:
  Function:
    Timeout: 3

Resources:

  MyRole:
    Type: AWS::IAM::Role
    Properties:
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonRDSFullAccess'
        - 'arn:aws:iam::aws:policy/service-role/AmazonAPIGatewayPushToCloudWatchLogs'
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          -
            Effect: Allow
            Principal:
              Service:
                - 'lambda.amazonaws.com'
            Action:
              - 'sts:AssumeRole'
      Policies:       
          PolicyName: 'ParameterStoreDevParameterAccess'
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              -
                Effect: Allow
                Action:
                  - 'ssm:GetParameter*'
                Resource: !Sub 'arn:aws:ssm:${AWS::Region}:${AWS::AccountId}:parameter/dev/*'
        -
          PolicyName: 'ParameterStoreDevLambdaBasicExecution'
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              -
                Effect: Allow
                Action:
                  - 'logs:CreateLogGroup'
                  - 'logs:CreateLogStream'
                  - 'logs:PutLogEvents'
                Resource: '*'
        -
          PolicyName: 'ParameterStoreDevXRayAccess'
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              -
                Effect: Allow
                Action:
                  - 'xray:PutTraceSegments'
                  - 'xray:PutTelemetryRecords'
                Resource: '*'
  MyFunction:
    Type: AWS::Serverless::Function
      Tracing: Active
      CodeUri: functions/src/
      Handler: lookup.lambdaHandler
      Runtime: nodejs10.x
      Timeout: 10
      MemorySize: 256
      Role: !GetAtt MyRole.Arn
      Events:
        Lookup:
          Type: Api
          Properties:
            Path: /somePath/{id}
            Method: get            

Answer 1

您的 lambda 函数定义中缺少 Properties 标记，并且缺少策略列表 - 对于第一个策略。

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
  OMW Backend Services

Globals:
  Function:
    Timeout: 3

Resources:

  MyRole:
    Type: AWS::IAM::Role
    Properties:
      ManagedPolicyArns:
        - 'arn:aws:iam::aws:policy/service-role/AmazonRDSFullAccess'
        - 'arn:aws:iam::aws:policy/service-role/AmazonAPIGatewayPushToCloudWatchLogs'
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          -
            Effect: Allow
            Principal:
              Service:
                - 'lambda.amazonaws.com'
            Action:
              - 'sts:AssumeRole'
      Policies:
        -
          PolicyName: 'ParameterStoreDevParameterAccess'
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              -
                Effect: Allow
                Action:
                  - 'ssm:GetParameter*'
                Resource: !Sub 'arn:aws:ssm:${AWS::Region}:${AWS::AccountId}:parameter/dev/*'
        -
          PolicyName: 'ParameterStoreDevLambdaBasicExecution'
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              -
                Effect: Allow
                Action:
                  - 'logs:CreateLogGroup'
                  - 'logs:CreateLogStream'
                  - 'logs:PutLogEvents'
                Resource: '*'
        -
          PolicyName: 'ParameterStoreDevXRayAccess'
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              -
                Effect: Allow
                Action:
                  - 'xray:PutTraceSegments'
                  - 'xray:PutTelemetryRecords'
                Resource: '*'
  MyFunction:
    Type: AWS::Serverless::Function
    Properties:
      Tracing: Active
      CodeUri: functions/src/
      Handler: lookup.lambdaHandler
      Runtime: nodejs10.x
      Timeout: 10
      MemorySize: 256
      Role: !GetAtt MyRole.Arn
      Events:
        Lookup:
          Type: Api
          Properties:
            Path: /somePath/{id}
            Method: get