getIamPolicy method
Gets the access control policy for a resource.
May be empty if no such policy or resource exists.
Request parameters:
project - Project ID for this request.
Value must have pattern
(?:(?:\[-a-z0-9\]{1,63}\.)*(?:\[a-z\](?:\[-a-z0-9\]{0,61}\[a-z0-9\])?):)?(?:\[0-9\]{1,19}|(?:\[a-z0-9\](?:\[-a-z0-9\]{0,61}\[a-z0-9\])?)).
resource - Name or id of the resource for this request.
Value must have pattern
\[a-z\](?:\[-a-z0-9_\]{0,61}\[a-z0-9\])?|\[1-9\]\[0-9\]{0,19}.
optionsRequestedPolicyVersion - Requested IAM Policy version.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Policy.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<Policy> getIamPolicy(
  core.String project,
  core.String resource, {
  core.int? optionsRequestedPolicyVersion,
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if (optionsRequestedPolicyVersion != null)
      'optionsRequestedPolicyVersion': ['${optionsRequestedPolicyVersion}'],
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'projects/' +
      commons.escapeVariable('$project') +
      '/global/machineImages/' +
      commons.escapeVariable('$resource') +
      '/getIamPolicy';
  final response_ = await _requester.request(
    url_,
    'GET',
    queryParams: queryParams_,
  );
  return Policy.fromJson(response_ as core.Map<core.String, core.dynamic>);
}