# Class to install and configure ISC Kea DHCP service.
# Check https://kb.isc.org/docs/kea-configuration-sections-explained for details
# for each parameter.
#
# [*ensure*]
#   present or absent. Default: present
#
# [*dhcp4_conf*]
#   Hash with the DHCP 4 service configuration. Sample content:
# Dhcp4:
#   interfaces-config:
#     interfaces:
#       - eth0
#   control-socket:
#     socket-type: "unix"
#     socket-name: "/run/kea/kea4-ctrl-socket"
#   lease-database:
#     type: memfile
#     lfc-interval: 3600
#   expired-leases-processing:
#     reclaim-timer-wait-time: 10
#     flush-reclaimed-timer-wait-time: 25
#     hold-reclaimed-time: 3600
#     max-reclaim-leases: 100
#     max-reclaim-time: 250
#     unwarned-reclaim-cycles: 5
#   renew-timer: 900
#   rebind-timer: 1800
#   valid-lifetime: 3600
#   option-data:
#     - name: domain-name-servers
#       data: "192.168.1.1, 192.168.1.2"
#     - name: "domain-search"
#       data: "example.com, example.org
#   client-classes: []
#   subnet4:
#     - subnet: "192.168.1.0/24"
#       pools:
#         - pool: "192.168.1.100 - 192.168.1.200"
#       option-data:
#         - name: "routers"
#           data: "192.168.1.1, 192.168.1.2"
#       reservations:
#         - hw-address: "1a:1b:1c:1d:1e:1f"
#           ip-address: "192.168.1.201"
#           hostname: "special-snowflake"
#   loggers:
#     - name: kea-dhcp4
#       output_options:
#         - output: "stdout"
#           pattern: "%-5p %m\n"
#       severity: "INFO"
#       debuglevel: 0
#   hooks-libraries:
#     - library: /usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_lease_cmds.so
#       parameters: {}
#     - library: /usr/lib/x86_64-linux-gnu/kea/hooks/libdhcp_ha.so
#       parameters:
#         high-availability:
#           - this-server-name: server1
#             trust-anchor: /etc/letsencrypt/live/server1/chain.pem
#             cert-file: /etc/letsencrypt/live/server1/cert.pem
#             key-file: /etc/letsencrypt/live/server1/privkey.pem
#             mode: hot-standby
#             heartbeat-delay: 10000
#             max-response-delay: 60000
#             max-ack-delay: 5000
#             max-unacked-clients: 5
#             peers:
#               - name: "server1"
#                 url: "http://192.168.1.1:8000/"
#                 role: "primary"
#                 auto-failover: true
#               - name: "server2"
#                 url: "http://192.168.1.2:8000/"
#                 role: "standby"
#                 auto-failover: true
#
# [*dhcp6_conf*]
#   Hash with the DHCP 4 service configuration. Sample content:
# Dhcp6:
#   interfaces-config:
#     interfaces:
#       - eth0
#   control-socket:
#     socket-type: "unix"
#     socket-name: "/run/kea/kea4-ctrl-socket"
#   lease-database:
#     type: memfile
#     lfc-interval: 3600
#   expired-leases-processing:
#     reclaim-timer-wait-time: 10
#     flush-reclaimed-timer-wait-time: 25
#     hold-reclaimed-time: 3600
#     max-reclaim-leases: 100
#     max-reclaim-time: 250
#     unwarned-reclaim-cycles: 5
#   renew-timer: 900
#   rebind-timer: 1800
#   valid-lifetime: 3600
#   option-data:
#     - name: domain-name-servers
#       data: "fd12:3456:789a:1::1, fd12:3456:789a:1::2"
#     - name: "domain-search"
#       data: "example.com, example.org"
#   client-classes: []
#   subnet6:
#     - subnet: "fd12:3456:789a:1::0/64"
#       pools:
#         - pool: "fd12:3456:789a:1::0/64"
#       option-data: []
#       reservations:
#         - hw-address: "1a:1b:1c:1d:1e:1f"
#           ip-address: "192.168.1.201"
#           hostname: "special-snowflake"
#   loggers:
#     - name: kea-dhcp4
#       output_options:
#         - output: "stdout"
#           pattern: "%-5p %m\n"
#       severity: "INFO"
#       debuglevel: 0
#
# [*ddns_conf*]
#   Hash with the Dynamic DNS configuration. Sample content:
# DhcpDdns:
#     ip-address: "127.0.0.1"
#     port: 53001
#     control-socket:
#         socket-type: "unix"
#         socket-name: "/run/kea/kea-ddns-ctrl-socket"
#     tsig-keys: []
#     forward-ddns : {}
#     reverse-ddns : {}
#     loggers:
#       - name: "kea-dhcp-ddns"
#         output_options: 
#           - output: stdout
#             pattern: "%-5p %m\n"
#     severity: INFO
#     debuglevel: 0
#
# [*ctrl_agent_conf*]
#   Hash with the Control Agent configuration. Sample content:
# Control-agent:
#     http-host: "127.0.0.1"
#     http-port: 8000
#     authentication:
#       type: "basic"
#       realm: "Kea Control Agent"
#     control-sockets:
#       dhcp4:
#         socket-type: "unix"
#         socket-name: "/run/kea/kea4-ctrl-socket"
#       dhcp6:
#         socket-type: "unix"
#         socket-name: "/run/kea/kea6-ctrl-socket"
#       d2:
#         socket-type: "unix"
#         socket-name: "/run/kea/kea-ddns-ctrl-socket"
#
# [*api_password*]
#   (Sensitive) String API password. So in your hiera data add the
# variable kea::api_password as an encrypted value and:
# lookup_options:
#   kea::api_password:
#     convert_to: "Sensitive"
#
class kea (
  String $ensure = 'present',
  Hash $dhcp4_conf = {},
  Hash $dhcp6_conf = {},
  Hash $ddns_conf = {},
  Hash $ctrl_agent_conf = {},
  Sensitive[String[1]] $api_password = '',
) {
  case $ensure {
    default: {
      $package_ensure = 'latest'
      $directory_ensure = 'directory'
      $link_ensure = 'link'
      $service_ensure = 'running'
    }
    /^(absent|delete|uninstall|remove|unregister)$/: {
      $package_ensure = 'absent'
      $directory_ensure = 'absent'
      $link_ensure = 'absent'
      $service_ensure = 'stopped'
    }
  }
  $services = [
    'kea-ctrl-agent.service',
    'kea-dhcp-ddns-server.service',
    'kea-dhcp4-server.service',
    'kea-dhcp6-server.service',
  ]
  package { 'kea':
    ensure => $package_ensure,
  }
  file { '/etc/kea/kea-api-password':
    ensure  => $ensure,
    content => $api_password,
    mode    => '0640',
    require => Package['kea'],
    notify  => Service[$services],
  }
  file { '/etc/kea/kea-dhcp4.conf':
    ensure  => $ensure,
    content => to_json_pretty($dhcp4_conf, nil, { indent => '    ' }),
    mode    => '0644',
    require => Package['kea'],
    notify  => Service[$services],
  }
  file { '/etc/kea/kea-dhcp6.conf':
    ensure  => $ensure,
    content => to_json_pretty($dhcp6_conf, nil, { indent => '    ' }),
    mode    => '0644',
    require => Package['kea'],
    notify  => Service[$services],
  }
  file { '/etc/kea/kea-dhcp-ddns.conf':
    ensure  => $ensure,
    content => to_json_pretty($ddns_conf, nil, { indent => '    ' }),
    mode    => '0644',
    require => Package['kea'],
    notify  => Service[$services],
  }
  file { '/etc/kea/kea-ctrl-agent.conf':
    ensure  => $ensure,
    content => to_json_pretty($ctrl_agent_conf, nil, { indent => '    ' }),
    mode    => '0644',
    require => Package['kea'],
    notify  => Service[$services],
  }
  service { $services:
    ensure  => $service_ensure,
    require => Package['kea'],
  }
}