infra/core/security/virtualnetwork.bicep

param name string
param location string = resourceGroup().location
param tags object = {}

param postgresServerName string

var databaseSubnetName = 'database-subnet'
var webappSubnetName = 'webapp-subnet'

resource virtualNetwork 'Microsoft.Network/virtualNetworks@2019-11-01' = {
  name: name
  location: location
  tags: tags
  properties: {
    addressSpace: {
      addressPrefixes: [
        '10.0.0.0/16'
      ]
    }
    subnets: [
      {
        name: databaseSubnetName
        properties: {
          addressPrefix: '10.0.0.0/24'
          delegations: [
            {
              name: '${name}-subnet-db'
              properties: {
                serviceName: 'Microsoft.DBforPostgreSQL/flexibleServers'
              }
            }
          ]
        }
      }
      {
        name: webappSubnetName
        properties: {
          addressPrefix: '10.0.1.0/24'
          delegations: [
            {
              name: '${name}-subnet-web'
              properties: {
                serviceName: 'Microsoft.Web/serverFarms'
              }
            }
          ]
        }
      }
    ]
  }
  resource databaseSubnet 'subnets' existing = {
    name: databaseSubnetName
  }
  resource webappSubnet 'subnets' existing = {
    name: webappSubnetName
  }
}

resource privateDnsZone 'Microsoft.Network/privateDnsZones@2020-06-01' = {
  name: '${postgresServerName}.private.postgres.database.azure.com'
  location: 'global'
  tags: tags
  dependsOn: [
    virtualNetwork
  ]
}

resource privateDnsZoneLink 'Microsoft.Network/privateDnsZones/virtualNetworkLinks@2020-06-01' = {
  parent: privateDnsZone
  name: '${name}-link'
  location: 'global'
  properties: {
    registrationEnabled: false
    virtualNetwork: {
      id: virtualNetwork.id
    }
  }
}

output databaseSubnetId string = virtualNetwork::databaseSubnet.id
output webSubnetId string = virtualNetwork::webappSubnet.id
output privateDnsZoneId string = privateDnsZone.id
output privateDnsZoneLink object = privateDnsZoneLink