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amazon-web-services - 在策略资源中使用 AWS::Region

问题描述

我正在尝试根据当前的云形成堆栈区域动态更改 s3 资源名称。Cloudformation 堆栈更新没有任何错误。难道我做错了什么？我期望将 {AWS::Region} 的政策解析为 us-east-1。

        Version: 2012-10-17
        Statement:
          - Sid: RestrictS3Access
            Effect: Allow
            Action:
              - 's3:GetObject'
            Resource:
              - !Sub "arn:aws:s3:::dnsa-${AWS::Region}test/${cognito-identity.amazonaws.com:sub}"
              - !Sub "arn:aws:s3:::dnsa-${AWS::Region}test/${cognito-identity.amazonaws.com:sub}/*"

我期待看到如下政策。我正在检查 aws 控制台的结果。

{
"Version": "2012-10-17",
"Statement": [
    {
        "Action": [
            "s3:GetObject"
        ],
        "Resource": [
            "arn:aws:s3:::dnsa-us-east-1/${cognito-identity.amazonaws.com:sub}",
            "arn:aws:s3:::dnsa-us-east-1/${cognito-identity.amazonaws.com:sub}/*"
        ],
        "Effect": "Allow",
        "Sid": "RestrictS3Access"
    }

标签： amazon-web-servicesamazon-cloudformation

解决方案

如果你想${cognito-identity.amazonaws.com:sub}保持不变，你需要用${!}.

    Version: 2012-10-17
    Statement:
      - Sid: RestrictS3Access
        Effect: Allow
        Action:
          - 's3:GetObject'
        Resource:
          - !Sub "arn:aws:s3:::dnsa-${AWS::Region}test/${!cognito-identity.amazonaws.com:sub}"
          - !Sub "arn:aws:s3:::dnsa-${AWS::Region}test/${!cognito-identity.amazonaws.com:sub}/*"

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