3 OCaml HTTP - do it yourself (fully OCaml) HTTP daemon
5 Copyright (C) <2002> Stefano Zacchiroli <zack@cs.unibo.it>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 exception Malformed_query of string
26 exception Malformed_query_part of string * string
27 exception Unsupported_method of string
28 exception Unsupported_HTTP_version of string
29 exception Malformed_request_URI of string
30 exception Malformed_request of string
33 type url_syntax_option =
34 Url_part_not_recognized
38 * (1) scheme://user:password@host:port/path;params?query#fragment
41 let request_uri_syntax = {
42 url_enable_scheme = Url_part_not_recognized;
43 url_enable_user = Url_part_not_recognized;
44 url_enable_password = Url_part_not_recognized;
45 url_enable_host = Url_part_not_recognized;
46 url_enable_port = Url_part_not_recognized;
47 url_enable_path = Url_part_required;
48 url_enable_param = Url_part_not_recognized;
49 url_enable_query = Url_part_allowed;
50 url_enable_fragment = Url_part_not_recognized;
51 url_enable_other = Url_part_not_recognized;
52 url_accepts_8bits = false;
53 url_is_valid = (fun _ -> true);
56 (** given an HTTP like query string (e.g. "name1=value1&name2=value2&...")
57 @return a list of pairs [("name1", "value1"); ("name2", "value2")]
58 @raise Malformed_query if the string isn't a valid query string
59 @raise Malformed_query_part if some piece of the query isn't valid
61 let split_query_params =
62 let (bindings_sep, binding_sep) = (Pcre.regexp "&", Pcre.regexp "=") in
63 let http_decode url = Netencoding.Url.decode ~plus:false url in
65 let bindings = Pcre.split ~rex:bindings_sep query in
66 if List.length bindings < 1 then
67 raise (Malformed_query query);
70 match Pcre.split ~rex:binding_sep binding with
71 | [""; b] -> (* '=b' *) raise (Malformed_query_part (binding, query))
72 | [a; b] -> (* 'a=b' *) (http_decode a, http_decode b)
73 | [a] -> (* 'a=' || 'a' *) (http_decode a, "")
74 | _ -> raise (Malformed_query_part (binding, query)))
77 (** given an input channel and a separator
78 @return a line read from it (like Pervasives.input_line)
79 line is returned only after reading a separator string; separator string isn't
80 included in the returned value
81 FIXME what about efficiency?, input is performed char-by-char
83 let generic_input_line ~sep ~ic =
84 let sep_len = String.length sep in
86 failwith ("Separator '" ^ sep ^ "' is too short!")
87 else (* valid separator *)
89 let sep_pointer = ref 0 in
92 if !sep_pointer >= String.length sep then (* line completed *)
94 else begin (* incomplete line: need to read more *)
95 let ch = input_char ic in
96 if ch = String.get sep !sep_pointer then (* next piece of sep *)
98 else begin (* useful char *)
99 for i = 0 to !sep_pointer - 1 do
100 line := !line ^ (String.make 1 (String.get sep i))
103 line := !line ^ (String.make 1 ch)
107 assert false (* unreacheable statement *)
114 (** given an input channel, reads from it a GET HTTP request and
115 @return a pair <path, query_params> where path is a string representing the
116 requested path and query_params is a list of pairs <name, value> (the GET
120 let patch_empty_path s = (if s = "" then "/" else s) in
121 let pieces_sep = Pcre.regexp " " in
123 let request_line = generic_input_line ~sep:Http_common.crlf ~ic in
124 match Pcre.split ~rex:pieces_sep request_line with
125 | [meth; request_uri_raw; http_version] ->
126 if meth <> "GET" then
127 raise (Unsupported_method meth);
128 (match http_version with
129 | "HTTP/1.0" | "HTTP/1.1" -> ()
130 | _ -> raise (Unsupported_HTTP_version http_version));
133 url_of_string request_uri_syntax request_uri_raw
134 with Malformed_URL ->
135 raise (Malformed_request_URI request_uri_raw)
138 patch_empty_path (String.concat "/" (url_path request_uri))
141 try (* act on HTTP encoded URIs *)
142 split_query_params (url_query ~encoded:true request_uri)
145 Http_common.debug_print
147 "recevied request; path: %s; params: %s"
151 (List.map (fun (n, v) -> n ^ "=" ^ v) query_params)));
153 | _ -> raise (Malformed_request request_line)