# == Definition: postfix::transport
#
# Manages content of the /etc/postfix/transport map.
#
# === Parameters
#
# [*name*]        - name of address postfix will lookup. See transport(5).
# [*destination*] - where the emails will be delivered to. See transport(5).
# [*ensure*]      - present/absent, defaults to present.
# [*nexthop*]     - A string to define where and how to deliver the mail. See transport(5).
#
# === Requires
#
# - Class["postfix"]
# - Postfix::Hash["/etc/postfix/transport"]
# - Postfix::Config["transport_maps"]
# - augeas
#
# === Examples
#
#   node "toto.example.com" {
#
#     include postfix
#
#     postfix::hash { "/etc/postfix/transport":
#       ensure => present,
#     }
#     postfix::config { "transport_maps":
#       value => "hash:/etc/postfix/transport"
#     }
#     postfix::transport { "mailman.example.com":
#       ensure      => present,
#       destination => "mailman",
#     }
#   }
#
define postfix::transport (
  $destination=undef,
  $nexthop=undef,
  $file='/etc/postfix/transport',
  $ensure='present'
) {
  include ::postfix::augeas

  validate_string($destination)
  validate_string($nexthop)
  validate_string($file)
  validate_absolute_path($file)
  validate_string($ensure)

  case $ensure {
    'present': {
      if ($destination) {
        $change_destination = "set pattern[. = '${name}']/transport '${destination}'"
      } else {
        $change_destination = "clear pattern[. = '${name}']/transport"
      }

      if ($nexthop) {
        $change_nexthop = "set pattern[. = '${name}']/nexthop '${nexthop}'"
      } else {
        $change_nexthop = "clear pattern[. = '${name}']/nexthop"
      }

      $changes = [
        "set pattern[. = '${name}'] '${name}'",
        $change_destination,
        $change_nexthop,
      ]
    }

    'absent': {
      $changes = "rm pattern[. = '${name}']"
    }

    default: {
      fail "\$ensure must be either 'present' or 'absent', got '${ensure}'"
    }
  }

  augeas {"Postfix transport - ${name}":
    lens    => 'Postfix_Transport.lns',
    incl    => $file,
    changes => $changes,
    require => [
      Package['postfix'],
      Augeas::Lens['postfix_transport'],
      ],
    notify  => Postfix::Hash['/etc/postfix/transport'],
  }
}