(*
  OCaml HTTP - do it yourself (fully OCaml) HTTP daemon

  Copyright (C) <2002-2004> Stefano Zacchiroli <zack@cs.unibo.it>

  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; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*)

open Neturl;;
open Printf;;

open Http_types;;
open Http_constants;;

(*
type url_syntax_option =
    Url_part_not_recognized
  | Url_part_allowed
  | Url_part_required

* (1) scheme://user:password@host:port/path;params?query#fragment
*)

let request_uri_syntax = {
  url_enable_scheme    = Url_part_not_recognized;
  url_enable_user      = Url_part_not_recognized;
  url_enable_password  = Url_part_not_recognized;
  url_enable_host      = Url_part_not_recognized;
  url_enable_port      = Url_part_not_recognized;
  url_enable_path      = Url_part_required;
  url_enable_param     = Url_part_not_recognized;
  url_enable_query     = Url_part_allowed;
  url_enable_fragment  = Url_part_not_recognized;
  url_enable_other     = Url_part_not_recognized;
  url_accepts_8bits    = false;
  url_is_valid         = (fun _ -> true);
}

  (* convention:
      foo_RE_raw  is the uncompiled regexp matching foo
      foo_RE      is the compiled regexp matching foo
      is_foo      is the predicate over string matching foo
  *)

let separators_RE_raw = "()<>@,;:\\\\\"/\\[\\]?={} \t"
let ctls_RE_raw = "\\x00-\\x1F\\x7F"
let token_RE_raw = "[^" ^ separators_RE_raw ^ ctls_RE_raw ^ "]+"
let lws_RE_raw = "(\r\n)?[ \t]"
let quoted_string_RE_raw = "\"(([^\"])|(\\\\\"))*\""
let text_RE_raw = "(([^" ^ ctls_RE_raw ^ "])|(" ^ lws_RE_raw ^ "))+"
let field_content_RE_raw =
  sprintf
    "^(((%s)|(%s)|(%s))|(%s))*$"
    token_RE_raw
    separators_RE_raw
    quoted_string_RE_raw
    text_RE_raw
(*
  (* following RFC 2616 specifications *)
let field_value_RE_raw = "((" ^ field_content_RE_raw ^ ")|(" ^ lws_RE_raw^ "))*"
*)
  (* smarter implementation: TEXT production is included in the regexp below *)
let field_value_RE_raw =
  sprintf
    "^((%s)|(%s)|(%s)|(%s))*$"
    token_RE_raw
    separators_RE_raw
    quoted_string_RE_raw
    lws_RE_raw

let token_RE = Pcre.regexp ("^" ^ token_RE_raw ^ "$")
let field_value_RE = Pcre.regexp ("^" ^ field_value_RE_raw ^ "$")
let heading_lws_RE = Pcre.regexp (sprintf "^%s*" lws_RE_raw)
let trailing_lws_RE = Pcre.regexp (sprintf "%s*$" lws_RE_raw)

let is_token s = Pcre.pmatch ~rex:token_RE s
let is_field_name = is_token
let is_field_value s = Pcre.pmatch ~rex:field_value_RE s

let heal_header_name s =
  if not (is_field_name s) then raise (Invalid_header_name s) else ()

let heal_header_value s =
  if not (is_field_value s) then raise (Invalid_header_value s) else ()

let normalize_header_value s =
  Pcre.replace ~rex:trailing_lws_RE
    (Pcre.replace ~rex:heading_lws_RE s)

let heal_header (name, value) =
  heal_header_name name;
  heal_header_value name
 
let url_of_string s =
  try
    url_of_string request_uri_syntax s
  with Neturl.Malformed_URL -> raise (Malformed_URL s)
let string_of_url = Neturl.string_of_url