创建 IAM 策略时出现 MalformedPolicyDocument 错误

Question

我正在尝试通过 AWS CLI 创建托管策略：

POLICY='
{
  "Version":"2012-10-17",
  "Statement":
  [{
    "Effect":"Allow",
    "Action":
    [
      "cloudformation:*"
    ],
    "Resource":"*"
  },
  {
    "Effect":"Deny",
    "Action":
    [
      "cloudformation:UpdateStack",
      "cloudformation:DeleteStack"
    ],
    "Resource": "'${arn}'"
  }]
}'

# Create policy if not already created
[ $(aws iam list-policies | grep -ce CloudFormation-policy-${StackName}) -eq 0 ] && (aws iam create-policy --policy-name CloudFormation-policy-${StackName} --policy-document "'${POLICY}'")

当我 运行 脚本时出现此错误：

An error occurred (MalformedPolicyDocument) when calling the CreatePolicy operation: Syntax errors in policy.

我不知道错误在哪里。 有什么想法吗？

Answer 1

每个操作系统都有自己的处理单引号和双引号转义的方式，并且根据 AWS CLI documentation:

When passing in large blocks of data, you might find it easier to save the JSON to a file and reference it from the command line. JSON data in a file is easier to read, edit, and share with others.

Quoting Strings approach might not be best choice while passing Json data, instead use Loading parameters from file approach.