Defining vhosts in Hiera, assigining them with an ENC

hiera.yaml

---
:hieradata:
  - vhosts/%{hostname}/%{vhost_name}
  - vhosts/%{vhost_name}
  - vhosts/common.yaml
  - common.yaml

:backends:
  - yaml

:datadir:
  - '/etc/puppet/hieradata'

vhost.pp

define apache::vhost {
  $vhost_name = "vhost_${name}"

  $vipname = hiera("vhost_vipname",$name)
  $cert    = hiera("vhost_cert", "${name}.crt")
  $docroot = hiera("vhost_docroot", "/var/www/${name}")

  #... resources and stuff ...

}

apache::vhost { $array_of_vhost_names_from_foreman: }