在策略資源中使用 AWS::Region

Question

我正在嘗試根據當前的雲形成堆棧區域動態更改 s3 資源名稱。 Cloudformation 堆棧更新沒有任何錯誤。 難道我做錯了什么？ 我期待將 {AWS::Region} 的策略解析為 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。 我正在檢查來自 aws 控制台的結果。

{
"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"
    }

Answer 1

如果您希望${cognito-identity.amazonaws.com:sub}保持不變，則需要使用${!}對其進行轉義。

    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}/*"