(* Copyright (C) 2000, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM 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.
 * 
 * HELM 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 HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://cs.unibo.it/helm/.
 *)

(* This resolver uses ClientHTTP to download the files from the Web *)
let url_resolver =
 let url_of_id =
  function
     Pxp_types.System url ->
      let http = Hashtbl.find Neturl.common_url_syntax "http" in
       Neturl.url_of_string http url
   | _ -> raise Pxp_reader.Not_competent
 in
 let channel_of_url _ url =
  let file = ClientHTTP.get_and_save_to_tmp (Neturl.string_of_url url) in
  let ch = open_in file in
   Unix.unlink file ;
   ch,None
 in
  new Pxp_reader.resolve_read_url_channel
   ~url_of_id ~channel_of_url ()
;;