+
+(*
+ OCaml HTTP - do it yourself (fully OCaml) HTTP daemon
+
+ Copyright (C) <2002> 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;;
+
+exception Malformed_query of string
+exception Malformed_query_binding of string * string
+exception Unsupported_method of string
+exception Unsupported_HTTP_version of string
+exception Malformed_request_URI of string
+exception Malformed_request of string
+
+(*
+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);
+}
+
+ (** given a list of length 2
+ @return a pair formed by the elements of the list
+ @raise Assert_failure if the list length isn't 2
+ *)
+let pair_of_2_sized_list = function
+ | [a;b] -> (a,b)
+ | _ -> assert false
+
+ (** given an HTTP like query string (e.g. "name1=value1&name2=value2&...")
+ @return a list of pairs [("name1", "value1"); ("name2", "value2")]
+ @raise Malformed_query if the string isn't a valid query string
+ @raise Malformed_query_binding if some piece of the query isn't valid
+ *)
+let split_query_params =
+ let (bindings_sep, binding_sep) = (Pcre.regexp "&", Pcre.regexp "=") in
+ fun ~query ->
+ let bindings = Pcre.split ~rex:bindings_sep query in
+ if List.length bindings < 1 then
+ raise (Malformed_query query);
+ List.map
+ (fun binding ->
+ let pieces = Pcre.split ~rex:binding_sep binding in
+ if List.length pieces <> 2 then
+ raise (Malformed_query_binding (binding, query));
+ pair_of_2_sized_list pieces)
+ bindings
+
+ (** given an input channel and a separator
+ @return a line read from it (like Pervasives.input_line)
+ line is returned only after reading a separator string; separator string isn't
+ included in the returned value
+ FIXME what about efficiency?, input is performed char-by-char
+ *)
+let generic_input_line ~sep ~ic =
+ let sep_len = String.length sep in
+ if sep_len < 1 then
+ failwith ("Separator '" ^ sep ^ "' is too short!")
+ else (* valid separator *)
+ let line = ref "" in
+ let sep_pointer = ref 0 in
+ try
+ while true do
+ if !sep_pointer >= String.length sep then (* line completed *)
+ raise End_of_file
+ else begin (* incomplete line: need to read more *)
+ let ch = input_char ic in
+ if ch = String.get sep !sep_pointer then (* next piece of sep *)
+ incr sep_pointer
+ else begin (* useful char *)
+ for i = 0 to !sep_pointer - 1 do
+ line := !line ^ (String.make 1 (String.get sep i))
+ done;
+ sep_pointer := 0;
+ line := !line ^ (String.make 1 ch)
+ end
+ end
+ done;
+ assert false (* unreacheable statement *)
+ with End_of_file ->
+ if !line = "" then
+ raise End_of_file
+ else
+ !line
+
+ (** given an input channel, reads from it a GET HTTP request and
+ @return a pair <path, query_params> where path is a string representing the
+ requested path and query_params is a list of pairs <name, value> (the GET
+ parameters)
+ *)
+let parse_request =
+ let patch_empty_path s = (if s = "" then "/" else s) in
+ let pieces_sep = Pcre.regexp " " in
+ fun ic ->
+ let request_line = generic_input_line ~sep:Http_common.crlf ~ic in
+ match Pcre.split ~rex:pieces_sep request_line with
+ | [meth; request_uri_raw; http_version] ->
+ if meth <> "GET" then
+ raise (Unsupported_method meth);
+ (match http_version with
+ | "HTTP/1.0" | "HTTP/1.1" -> ()
+ | _ -> raise (Unsupported_HTTP_version http_version));
+ let request_uri =
+ try
+ url_of_string request_uri_syntax request_uri_raw
+ with Malformed_URL ->
+ raise (Malformed_request_URI request_uri_raw)
+ in
+ let path =
+ patch_empty_path (String.concat "/" (url_path request_uri))
+ in
+ let query_params =
+ try split_query_params (url_query request_uri) with Not_found -> []
+ in
+ (path, query_params)
+ | _ -> raise (Malformed_request request_line)
+