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The ARN of the IAM user that you want to specify as the simulated caller of the APIs. If you do not specify a CallerArn, it defaults to the ARN of the user that you specify in PolicySourceArn, if you specified a user. If you include both a PolicySourceArn (for example, arn:aws:iam::123456789012:user/David) and a CallerArn (for example, arn:aws:iam::123456789012:user/Bob), the result is that you simulate calling the APIs as Bob, as if Bob had David's policies.

You can specify only the ARN of an IAM user. You cannot specify the ARN of an assumed role, federated user, or a service principal.

CallerArn is required if you include a ResourcePolicy and the PolicySourceArn

is not the ARN for an IAM user. This is required so that the resource-based policy's Principal element has a value to use in evaluating the policy.

For more information about ARNs, see Amazon Resource Names (ARNs) and AWS Service Namespaces ( in the AWS General Reference.

CallerArn is referenced in 1 repository