Added IAM support

src/util/breakdown-arn.ts

@@ -0,0 +1,21 @@
+export type ArnParts = {
+  service: string;
+  region: string;
+  accountId: string;
+  identifier: string;
+}
+
+export const breakdownArn = (arn: string): ArnParts => {
+  if (!arn.startsWith('arn')) {
+    throw new Error('Invalid arn');
+  }
+
+  const [_arn, _aws, service, region, accountId, ...identifierData] = arn.split(':');
+
+  return {
+    service,
+    region,
+    accountId,
+    identifier: identifierData.join(':'),
+  }
+}