Query: network_security_group_not_configured_gateway_subnets

with all_subnet as (
  select
    *
  from
    terraform_resource
  where
    type = 'azurerm_subnet'
),
network_security_group_association as (
  select
    *
  from
    terraform_resource
  where
    type = 'azurerm_subnet_network_security_group_association'
)
select
  a.address as resource,
  case
    when (a.attributes_std ->> 'name') :: text = 'GatewaySubnet'
    and (s.attributes_std ->> 'subnet_id') is not null then 'alarm'
    when (a.attributes_std ->> 'name') :: text = 'GatewaySubnet'
    and (s.attributes_std ->> 'subnet_id') is null then 'ok'
    else 'skip'
  end as status,
  split_part(a.address, '.', 2) || case
    when (a.attributes_std ->> 'name') :: text = 'GatewaySubnet'
    and (s.attributes_std ->> 'subnet_id') is not null then ' Gateway subnet configured with network security group'
    when (a.attributes_std ->> 'name') :: text = 'GatewaySubnet'
    and (s.attributes_std ->> 'subnet_id') is null then ' Gateway subnet not configured with network security group'
    else ' not of gateway subnet type'
  end || '.' reason,
  a.path || ':' || a.start_line
from
  all_subnet as a
  left join network_security_group_association as s on a.name = (
    split_part((s.attributes_std ->> 'subnet_id'), '.', 2)
  );