#!/bin/bash

set -e

do_init_regen() {
  if [[ $EUID -ne 0 ]]; then
      echo "You must be root to run this script" 1>&2
      exit 1
  fi

  do_pre_regen ""

  # fix some permissions
  chown root:openldap /etc/ldap/slapd.conf
  chown -R openldap:openldap /etc/ldap/schema/

  # check the slapd config file at first
  slaptest -Q -u -f /etc/ldap/slapd.conf

  # regenerate LDAP config directory from slapd.conf
  rm -Rf /etc/ldap/slapd.d
  mkdir /etc/ldap/slapd.d
  slaptest -f /etc/ldap/slapd.conf -F /etc/ldap/slapd.d/ 2>&1
  chown -R openldap:openldap /etc/ldap/slapd.d/

  service slapd restart
}

do_pre_regen() {
  pending_dir=$1

  cd /usr/share/yunohost/templates/slapd

  # remove legacy configuration file
  [ ! -f /etc/ldap/slapd-yuno.conf ] \
    || touch "${pending_dir}/etc/ldap/slapd-yuno.conf"

  # create needed directories
  ldap_dir="${pending_dir}/etc/ldap"
  schema_dir="${ldap_dir}/schema"
  mkdir -p "$ldap_dir" "$schema_dir"

  # copy configuration files
  cp -a ldap.conf slapd.conf "$ldap_dir"
  cp -a sudo.schema mailserver.schema "$schema_dir"

  install -D -m 644 slapd.default "${pending_dir}/etc/default/slapd"
}

do_post_regen() {
  regen_conf_files=$1

  # fix some permissions
  sudo chown root:openldap /etc/ldap/slapd.conf
  sudo chown -R openldap:openldap /etc/ldap/schema/
  sudo chown -R openldap:openldap /etc/ldap/slapd.d/

  [ -z "$regen_conf_files" ] && exit 0

  # retrieve current and new backends
  curr_backend=$(sudo slapcat -n 0 \
                   | sed -n 's/^dn: olcDatabase={1}\(.*\),cn=config$/\1/p')
  new_backend=$(grep '^database' /etc/ldap/slapd.conf | awk '{print $2}')

  # save current database in case of a backend change
  backend_change=0
  backup_dir="/var/backups/dc=yunohost,dc=org-${curr_backend}-$(date +%s)"
  if [[ -n "$curr_backend" && "$curr_backend" != "$new_backend" ]]; then
      backend_change=1
      sudo mkdir -p "$backup_dir"
      sudo slapcat -b dc=yunohost,dc=org \
        -l "${backup_dir}/dc=yunohost-dc=org.ldif"
  fi

  # check the slapd config file at first
  sudo slaptest -Q -u -f /etc/ldap/slapd.conf

  if [[ $backend_change -eq 1 ]]; then
      # regenerate LDAP config directory and import database as root
      # since the admin user may be unavailable
      sudo sh -c "rm -Rf /etc/ldap/slapd.d;
  mkdir /etc/ldap/slapd.d;
  slaptest -f /etc/ldap/slapd.conf -F /etc/ldap/slapd.d;
  chown -R openldap:openldap /etc/ldap/slapd.d;
  slapadd -F /etc/ldap/slapd.d -b dc=yunohost,dc=org \
    -l '${backup_dir}/dc=yunohost-dc=org.ldif';
  chown -R openldap:openldap /var/lib/ldap" 2>&1
  else
      # regenerate LDAP config directory from slapd.conf
      sudo rm -Rf /etc/ldap/slapd.d
      sudo mkdir /etc/ldap/slapd.d
      sudo slaptest -f /etc/ldap/slapd.conf -F /etc/ldap/slapd.d/ 2>&1
      sudo chown -R openldap:openldap /etc/ldap/slapd.d/
  fi

  sudo service slapd force-reload
}

FORCE=${2:-0}
DRY_RUN=${3:-0}

case "$1" in
  pre)
    do_pre_regen $4
    ;;
  post)
    do_post_regen $4
    ;;
  init)
    do_init_regen
    ;;
  *)
    echo "hook called with unknown argument \`$1'" >&2
    exit 1
    ;;
esac

exit 0