Condition key for the Amazon Resource Name (ARN) of the source specified
in a request. The source ARN indicates which resource is affecting the
resource listed in your policy. For example, an SNS topic is the source
ARN when publishing messages from the topic to an SQS queue.
This condition key should only be used with ConditionFactory..::..ArnComparisonType enum.

C# |
public const string SOURCE_ARN_CONDITION_KEY