(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: edit_hostnames.ml,v 1.6 2004/09/23 11:56:47 rich Exp $
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *)

open Apache
open Registry
open Cgi
open Printf

open Cocanwiki
open Cocanwiki_ok
open Cocanwiki_strings

let split_re = Pcre.regexp "[\\s,;]+"

let run r (q : cgi) (dbh : Dbi.connection) _ host' _ =
  let hostid = int_of_string (q#param "hostid") in

  if q#param_true "cancel" then (
    let { hostname = hostname } = host' in
    q#redirect ("http://" ^ hostname ^ "/_bin/admin/host.cmo?hostid=" ^
		string_of_int hostid);
    return ()
  );

  let canonical_hostname = q#param "canonical_hostname" in
  let hostnames = try q#param "hostnames" with Not_found -> "" in

  (* In theory we could verify characters in hostnames, and call
   * error / return () if the format is incorrect.  However
   * it's probably best to assume the sysadmin knows what they're up to
   * here.  If this script is allowed to be accessed by untrusted users,
   * then this has security implications.
   *)
  let check_hostname h =
    let h = trim h in			(* Trim whitespace. *)
    let h = String.lowercase h in	(* Lowercase. *)
    h
  in

  let canonical_hostname = check_hostname canonical_hostname in
  let hostnames = Pcre.split ~rex:split_re hostnames in
  let hostnames = List.map check_hostname hostnames in
  let hostnames = List.filter ((<>) "") hostnames in

  (* Update the database. *)
  let sth = dbh#prepare_cached
	      "set constraints \"hosts_hostname_cn\" deferred" in
  sth#execute [];
  let sth = dbh#prepare_cached "update hosts set canonical_hostname = ?
                                 where id = ?" in
  sth#execute [`String canonical_hostname; `Int hostid];
  let sth = dbh#prepare_cached "delete from hostnames where hostid = ?" in
  sth#execute [`Int hostid];
  let sth = dbh#prepare_cached "insert into hostnames (hostid, name)
                                values (?, ?)" in
  sth#execute [`Int hostid; `String canonical_hostname];
  List.iter (fun name ->
	       sth#execute [`Int hostid; `String name]) hostnames;

  (* Commit to the database. *)
  dbh#commit ();

  (* Print confirmation page. *)
  let buttons = [
    { StdPages.label = "OK";
      StdPages.link = "/_bin/admin/host.cmo";
      StdPages.method_ = None;
      StdPages.params = [ "hostid", string_of_int hostid ] }
  ] in

  ok ~title:"Saved" ~buttons
    q "Hostnames updated."

let () =
  register_script run