#!/bin/bash

set -e

tmp_backup_dir_file="/tmp/slapd-backup-dir.txt"

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/
  usermod -aG ssl-cert openldap

  # 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

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

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

  # remove temporary backup file
  rm -f "$tmp_backup_dir_file"

  # retrieve current and new backends
  curr_backend=$(grep '^database' /etc/ldap/slapd.conf 2>/dev/null | awk '{print $2}')
  new_backend=$(grep '^database' slapd.conf | awk '{print $2}')

  # save current database before any conf changes
  if [[ -n "$curr_backend" && "$curr_backend" != "$new_backend" ]]; then
    backup_dir="/var/backups/dc=yunohost,dc=org-${curr_backend}-$(date +%s)"
    mkdir -p "$backup_dir"
    slapcat -b dc=yunohost,dc=org \
      -l "${backup_dir}/dc=yunohost-dc=org.ldif"
    echo "$backup_dir" > "$tmp_backup_dir_file"
  fi

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

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

do_post_regen() {
  regen_conf_files=$1

  # ensure that slapd.d exists
  mkdir -p /etc/ldap/slapd.d

  # fix some permissions
  echo "Making sure we have the right permissions needed ..."
  # penldap user should be in the ssl-cert group to let it access the certificate for TLS
  usermod -aG ssl-cert openldap
  chown root:openldap /etc/ldap/slapd.conf
  chown -R openldap:openldap /etc/ldap/schema/
  chown -R openldap:openldap /etc/ldap/slapd.d/
  chown -R root:ssl-cert /etc/yunohost/certs/yunohost.org/
  chmod o-rwx /etc/yunohost/certs/yunohost.org/

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

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

  # check if a backup should be restored
  backup_dir=$(cat "$tmp_backup_dir_file" 2>/dev/null || true)
  if [[ -n "$backup_dir" && -f "${backup_dir}/dc=yunohost-dc=org.ldif" ]]; then
      # regenerate LDAP config directory and import database as root
      # since the admin user may be unavailable
      echo "Regenerate LDAP config directory and import the database using slapadd"
      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
      echo "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/
  fi

  echo "Running slapdindex"
  su openldap -s "/bin/bash" -c "/usr/sbin/slapindex"

  echo "Reloading slapd"
  service slapd force-reload

  # on slow hardware/vm this regen conf would exit before the admin user that
  # is stored in ldap is available because ldap seems to slow to restart
  # so we'll wait either until we are able to log as admin or until a timeout
  # is reached
  # we need to do this because the next hooks executed after this one during
  # postinstall requires to run as admin thus breaking postinstall on slow
  # hardware which mean yunohost can't be correctly installed on those hardware
  # and this sucks
  # wait a maximum time of 5 minutes
  # yes, force-reload behave like a restart
  number_of_wait=0
  while ! sudo su admin -c '' && ((number_of_wait < 60))
  do
      sleep 5
      ((number_of_wait += 1))
  done
}

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