(* 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/.
 *)

(* cut and paste from ../getter/clientHTTP.ml *)
exception HttpClientError of string * string;;	(* reason, uri *)

let send cmd =
 try
  ignore (Http_client.http_get cmd)
 with
  e -> raise (HttpClientError (Printexc.to_string e, cmd))
;;

let get uri =
 try
  Http_client.http_get uri
 with
  e -> raise (HttpClientError (Printexc.to_string e, uri))
;;

let get_and_save uri dest_filename =
 let reply = get uri
 and out_channel = open_out dest_filename in
  output_string out_channel reply ;
  close_out out_channel
;;

let get_and_save_to_tmp uri =
 let flat_string s s' c =
  let cs = String.copy s in
   for i = 0 to (String.length s) - 1 do
    if String.contains s' s.[i] then cs.[i] <- c
   done ;
   cs
 in
  let user = try Unix.getlogin () with _ -> "" in
  let tmp_file =
    Filename.temp_file (user ^ flat_string uri ".-=:;!?/&" '_') ""
  in
  get_and_save uri tmp_file ;
  tmp_file
;;
(* / cut and paste from ../getter/clientHTTP.ml *)

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 = 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 ()
;;