1 (* Copyright (C) 2002, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM 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 HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
27 let debug_print s = if debug then prerr_endline s;;
28 Http_common.debug := true;;
29 (* Http_common.debug := true;; *)
31 (** accepted HTTP servers for ask_uwobo method forwarding *)
32 let valid_servers = [ "mowgli.cs.unibo.it:58080" ] ;;
36 let postgresConnectionString =
38 Sys.getenv "POSTGRESQL_CONNECTION_STRING"
40 Not_found -> "host=mowgli.cs.unibo.it dbname=helm_mowgli_new_schema user=helm"
43 let daemon_name = "Search Engine";;
44 let default_port = 58085;;
45 let port_env_var = "SEARCH_ENGINE_PORT";;
49 Sys.getenv "SEARCH_ENGINE_HTML_DIR"
50 with Not_found -> "html" (* relative to searchEngine's document root *)
52 let interactive_user_uri_choice_TPL = pages_dir ^ "/templateambigpdq1.html";;
53 let interactive_interpretation_choice_TPL = pages_dir ^ "/templateambigpdq2.html";;
54 let final_results_TPL = pages_dir ^ "/templateambigpdq3.html";;
56 exception Chat_unfinished
58 (** pretty print a MathQL query result to an HELM theory file *)
59 let theory_of_result result =
60 let results_no = List.length result in
61 if results_no > 0 then
62 let mode = if results_no > 10 then "linkonly" else "typeonly" in
64 let idx = ref (results_no + 1) in
68 "<tr><td valign=\"top\">" ^ string_of_int !idx ^ ".</td><td><ht:OBJECT uri=\"" ^ uri ^ "\" mode=\"" ^ mode ^ "\"/></td></tr>" ^ i
71 "<h1>Query Results:</h1><table xmlns:ht=\"http://www.cs.unibo.it/helm/namespaces/helm-theory\">" ^ results ^ "</table>"
73 "<h1>Query Results:</h1><p>No results found!</p>"
76 let pp_result result =
77 "<html xmlns:ht=\"http://www.cs.unibo.it/helm/namespaces/helm-theory\">\n<head><title>Query Results</title><style> A { text-decoration: none } </style></head>\n<body>" ^ theory_of_result result ^ "</body></html>"
80 (** chain application of Pcre substitutions *)
81 let rec apply_substs substs line =
84 | (rex, templ) :: rest -> apply_substs rest (Pcre.replace ~rex ~templ line)
85 (** fold like function on files *)
86 let fold_file f init fname =
87 let inchan = open_in fname in
88 let rec fold_lines' value =
90 let line = input_line inchan in
91 fold_lines' (f value line)
92 with End_of_file -> value
94 let res = (try fold_lines' init with e -> (close_in inchan; raise e)) in
97 (** iter like function on files *)
98 let iter_file f = fold_file (fun _ line -> f line) ()
100 let (title_tag_RE, choices_tag_RE, msg_tag_RE, id_to_uris_RE, id_RE,
101 interpretations_RE, interpretations_labels_RE, results_RE, new_aliases_RE) =
102 (Pcre.regexp "@TITLE@", Pcre.regexp "@CHOICES@", Pcre.regexp "@MSG@",
103 Pcre.regexp "@ID_TO_URIS@", Pcre.regexp "@ID@",
104 Pcre.regexp "@INTERPRETATIONS@", Pcre.regexp "@INTERPRETATIONS_LABELS@",
105 Pcre.regexp "@RESULTS@", Pcre.regexp "@NEW_ALIASES@")
106 let server_and_port_url_RE = Pcre.regexp "^http://([^/]+)/.*$"
110 int_of_string (Sys.getenv port_env_var)
112 | Not_found -> default_port
113 | Failure "int_of_string" ->
114 prerr_endline "Warning: invalid port, reverting to default";
117 let pp_error = sprintf "<html><body><h1>Error: %s</h1></body></html>" in
118 let bad_request body outchan =
119 Http_daemon.respond_error ~status:(`Client_error `Bad_request) ~body outchan
121 let contype = "Content-Type", "text/html" in
123 (* SEARCH ENGINE functions *)
125 let refine_constraints (x, y, z) = (x, y, z), (Some x, Some y, Some z) in
127 (* HTTP DAEMON CALLBACK *)
129 let callback (req: Http_types.request) outchan =
131 debug_print (sprintf "Received request: %s" req#path);
132 if req#path <> "/getpage" then
133 Mqint.init postgresConnectionString;
136 let query_string = req#param "query" in
137 let lexbuf = Lexing.from_string query_string in
138 let query = MQueryUtil.query_of_text lexbuf in
139 let result = MQueryGenerator.execute_query query in
140 let result_string = pp_result result in
141 Http_daemon.respond ~body:result_string ~headers:[contype] outchan
143 let id = req#param "id" in
144 let result = MQueryGenerator.locate id in
145 Http_daemon.respond ~headers:[contype] ~body:(pp_result result) outchan
147 (* TODO implement "is_permitted" *)
148 (let is_permitted _ = true in
149 let remove_fragment uri = Pcre.replace ~pat:"#.*" uri in
150 let page = remove_fragment (req#param "url") in
152 | page when is_permitted page ->
153 Http_daemon.respond_file
154 ~fname:(sprintf "%s/%s" pages_dir (remove_fragment page)) outchan
155 | page -> Http_daemon.respond_forbidden ~url:page outchan)
157 let url = req#param "url" in
158 let server_and_port =
159 (Pcre.extract ~rex:server_and_port_url_RE url).(1)
161 if List.mem server_and_port valid_servers then
163 ~body:(Http_client.Convenience.http_get url)
167 ~body:(pp_error ("Invalid UWOBO server: " ^ server_and_port))
169 | "/searchPattern" ->
170 let term_string = req#param "term" in
171 let lexbuf = Lexing.from_string term_string in
172 let (context, metasenv) = ([], []) in
173 let (dom, mk_metasenv_and_expr) =
174 CicTextualParserContext.main
175 ~context ~metasenv CicTextualLexer.token lexbuf
177 let id_to_uris_raw = req#param "aliases" in
178 let tokens = Pcre.split ~pat:"\\s" id_to_uris_raw in
179 let rec parse_tokens keys lookup = function (* TODO spostarla fuori *)
181 | "alias" :: key :: value :: rest ->
182 let key' = CicTextualParser0.Id key in
188 (CicTextualParser0.Uri (MQueryMisc.cic_textual_parser_uri_of_string value))
191 | _ -> failwith "Can't parse aliases"
193 let parse_choices choices_raw =
194 let choices = Pcre.split ~pat:";" choices_raw in
197 match Pcre.split ~pat:"\\s" x with
199 | id::tail when id<>"" ->
201 prerr_endline ("#### " ^ id ^ " :=");
202 List.iter (fun u -> prerr_endline ("<" ^ Netencoding.Url.decode u ^ ">")) tail;
204 Some (List.map (fun u -> Netencoding.Url.decode u) tail)
207 | _ -> failwith "Can't parse choices")
211 let (id_to_uris : Disambiguate.domain_and_interpretation) =
212 parse_tokens [] (fun _ -> None) tokens in
215 let choices_raw = req#param "choices" in
216 parse_choices choices_raw
217 with Http_types.Param_not_found _ -> (fun _ -> None)
219 let module Chat: Disambiguate.Callbacks =
222 let get_metasenv () =
223 !CicTextualParser0.metasenv
225 let set_metasenv metasenv =
226 CicTextualParser0.metasenv := metasenv
228 let output_html = prerr_endline
230 let interactive_user_uri_choice
232 ?enable_button_for_non_vars ~(title: string) ~(msg: string)
233 ~(id: string) (choices: string list)
235 (match id_to_choices id with
236 | Some choices -> choices
238 let msg = Pcre.replace ~pat:"\"" ~templ:"\\\"" msg in
239 (match selection_mode with
240 | `SINGLE -> assert false
242 Http_daemon.send_basic_headers ~code:200 outchan ;
243 Http_daemon.send_CRLF outchan ;
246 let formatted_choices =
248 (List.map (fun uri -> sprintf "\"%s\"" uri) choices)
252 [title_tag_RE, title;
253 choices_tag_RE, formatted_choices;
255 id_to_uris_RE, id_to_uris_raw;
259 output_string outchan (processed_line ^ "\n"))
260 interactive_user_uri_choice_TPL;
261 raise Chat_unfinished))
263 let interactive_interpretation_choice interpretations =
264 let html_interpretations_labels =
269 (String.concat "<br />"
272 (sprintf "alias %s %s" id value))
277 let html_interpretations =
285 (sprintf "alias %s %s"
287 (MQueryMisc.wrong_xpointer_format_from_wrong_xpointer_format'
293 Http_daemon.send_basic_headers ~code:200 outchan ;
294 Http_daemon.send_CRLF outchan ;
299 [interpretations_RE, html_interpretations;
300 interpretations_labels_RE, html_interpretations_labels]
303 output_string outchan (processed_line ^ "\n"))
304 interactive_interpretation_choice_TPL;
305 raise Chat_unfinished
307 let input_or_locate_uri ~title =
308 UriManager.uri_of_string "cic:/Coq/Init/DataTypes/nat_ind.con"
312 let module Disambiguate' = Disambiguate.Make (Chat) in
313 let (id_to_uris', metasenv', term') =
314 Disambiguate'.disambiguate_input
315 context metasenv dom mk_metasenv_and_expr id_to_uris
317 (match metasenv' with
319 let must = MQueryLevels2.get_constraints term' in
320 let must',only = refine_constraints must in
321 let results = MQueryGenerator.searchPattern must' only in
322 Http_daemon.send_basic_headers ~code:200 outchan ;
323 Http_daemon.send_CRLF outchan ;
327 match id_to_uris' with
332 sprintf "\"alias %s cic:%s\""
334 CicTextualParser0.Id name -> name
335 | _ -> assert false (*CSC: completare *))
337 | None -> assert false
338 | Some (CicTextualParser0.Uri t) ->
339 MQueryMisc.string_of_cic_textual_parser_uri
341 | _ -> assert false (*CSC: completare *)))
346 [results_RE, theory_of_result results ;
347 new_aliases_RE, new_aliases]
350 output_string outchan (processed_line ^ "\n"))
352 | _ -> (* unable to instantiate some implicit variable *)
355 ~body:"some implicit variables are still unistantiated :-("
359 Http_daemon.respond_error ~status:(`Client_error `Bad_request) outchan);
360 if req#path <> "/getpage" then
362 debug_print (sprintf "%s done!" req#path)
364 | Chat_unfinished -> prerr_endline "Chat unfinished, Try again!"
365 | Http_types.Param_not_found attr_name ->
366 bad_request (sprintf "Parameter '%s' is missing" attr_name) outchan
369 ~body:(pp_error ("Uncaught exception: " ^ (Printexc.to_string exc)))
372 printf "%s started and listening on port %d\n" daemon_name port;
373 printf "Current directory is %s\n" (Sys.getcwd ());
374 printf "HTML directory is %s\n" pages_dir;
376 Unix.putenv "http_proxy" "";
377 Mqint.set_database Mqint.postgres_db;
378 Http_daemon.start' ~port callback;
379 printf "%s is terminating, bye!\n" daemon_name