setIamPolicy method
Sets the access control policy on the specified resource.
Replaces any existing policy.Can return NOT_FOUND, INVALID_ARGUMENT, and PERMISSION_DENIED errors.
request - The metadata request object.
Request parameters:
resource - REQUIRED: The resource for which the policy is being
specified. See Resource names
(https://cloud.google.com/apis/design/resource_names) for the appropriate
value for this field.
Value must have pattern
^projects/\[^/\]+/regions/\[^/\]+/workflowTemplates/\[^/\]+$.
$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> setIamPolicy(
  SetIamPolicyRequest request,
  core.String resource, {
  core.String? $fields,
}) async {
  final body_ = convert.json.encode(request);
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'v1/' + core.Uri.encodeFull('$resource') + ':setIamPolicy';
  final response_ = await _requester.request(
    url_,
    'POST',
    body: body_,
    queryParams: queryParams_,
  );
  return Policy.fromJson(response_ as core.Map<core.String, core.dynamic>);
}