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" ; "localhost: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)
103 (Pcre.regexp "@TITLE@", Pcre.regexp "@CHOICES@", Pcre.regexp "@MSG@",
104 Pcre.regexp "@ID_TO_URIS@", Pcre.regexp "@ID@",
105 Pcre.regexp "@INTERPRETATIONS@", Pcre.regexp "@INTERPRETATIONS_LABELS@",
106 Pcre.regexp "@RESULTS@", Pcre.regexp "@NEW_ALIASES@")
107 let server_and_port_url_RE = Pcre.regexp "^http://([^/]+)/.*$"
111 int_of_string (Sys.getenv port_env_var)
113 | Not_found -> default_port
114 | Failure "int_of_string" ->
115 prerr_endline "Warning: invalid port, reverting to default";
118 let pp_error = sprintf "<html><body><h1>Error: %s</h1></body></html>" in
119 let bad_request body outchan =
120 Http_daemon.respond_error ~status:(`Client_error `Bad_request) ~body outchan
122 let contype = "Content-Type", "text/html" in
124 (* SEARCH ENGINE functions *)
126 let refine_constraints (x, y, z) = (x, y, z), (Some x, Some y, Some z) in
128 (* HTTP DAEMON CALLBACK *)
130 let callback (req: Http_types.request) outchan =
132 debug_print (sprintf "Received request: %s" req#path);
133 if req#path <> "/getpage" then
134 Mqint.init postgresConnectionString;
137 let query_string = req#param "query" in
138 let lexbuf = Lexing.from_string query_string in
139 let query = MQueryUtil.query_of_text lexbuf in
140 let result = MQueryGenerator.execute_query query in
141 let result_string = pp_result result in
142 Http_daemon.respond ~body:result_string ~headers:[contype] outchan
144 let id = req#param "id" in
145 let result = MQueryGenerator.locate id in
146 Http_daemon.respond ~headers:[contype] ~body:(pp_result result) outchan
148 (* TODO implement "is_permitted" *)
149 (let is_permitted _ = true in
150 let remove_fragment uri = Pcre.replace ~pat:"#.*" uri in
151 let page = remove_fragment (req#param "url") in
154 bool_of_string (req#param "preprocess")
155 with Invalid_argument _ | Http_types.Param_not_found _ -> false)
158 | page when is_permitted page ->
159 let fname = sprintf "%s/%s" pages_dir (remove_fragment page) in
160 if preprocess then begin
161 Http_daemon.send_basic_headers ~code:200 outchan;
162 Http_daemon.send_CRLF outchan;
165 output_string outchan
168 (function (key,value) ->
170 (Pcre.extract ~pat:"param\\.(.*)" key).(1)
172 Pcre.regexp ("@" ^ key' ^ "@"), value
175 (fun (key,_) as p-> Pcre.pmatch ~pat:"^param\\." key)
182 Http_daemon.respond_file ~fname outchan
183 | page -> Http_daemon.respond_forbidden ~url:page outchan))
185 let url = req#param "url" in
186 let server_and_port =
187 (Pcre.extract ~rex:server_and_port_url_RE url).(1)
189 if List.mem server_and_port valid_servers then
191 ~body:(Http_client.Convenience.http_get url)
195 ~body:(pp_error ("Invalid UWOBO server: " ^ server_and_port))
197 | "/searchPattern" ->
198 let term_string = req#param "term" in
199 let lexbuf = Lexing.from_string term_string in
200 let (context, metasenv) = ([], []) in
201 let (dom, mk_metasenv_and_expr) =
202 CicTextualParserContext.main
203 ~context ~metasenv CicTextualLexer.token lexbuf
205 let id_to_uris_raw = req#param "aliases" in
206 let tokens = Pcre.split ~pat:"\\s" id_to_uris_raw in
207 let rec parse_tokens keys lookup = function (* TODO spostarla fuori *)
209 | "alias" :: key :: value :: rest ->
210 let key' = CicTextualParser0.Id key in
216 (CicTextualParser0.Uri (MQueryMisc.cic_textual_parser_uri_of_string value))
219 | _ -> failwith "Can't parse aliases"
221 let parse_choices choices_raw =
222 let choices = Pcre.split ~pat:";" choices_raw in
225 match Pcre.split ~pat:"\\s" x with
227 | id::tail when id<>"" ->
229 prerr_endline ("#### " ^ id ^ " :=");
230 List.iter (fun u -> prerr_endline ("<" ^ Netencoding.Url.decode u ^ ">")) tail;
232 Some (List.map (fun u -> Netencoding.Url.decode u) tail)
235 | _ -> failwith "Can't parse choices")
239 let (id_to_uris : Disambiguate.domain_and_interpretation) =
240 parse_tokens [] (fun _ -> None) tokens in
243 let choices_raw = req#param "choices" in
244 parse_choices choices_raw
245 with Http_types.Param_not_found _ -> (fun _ -> None)
247 let module Chat: Disambiguate.Callbacks =
250 let get_metasenv () =
251 !CicTextualParser0.metasenv
253 let set_metasenv metasenv =
254 CicTextualParser0.metasenv := metasenv
256 let output_html = prerr_endline
258 let interactive_user_uri_choice
260 ?enable_button_for_non_vars ~(title: string) ~(msg: string)
261 ~(id: string) (choices: string list)
263 (match id_to_choices id with
264 | Some choices -> choices
266 let msg = Pcre.replace ~pat:"\"" ~templ:"\\\"" msg in
267 (match selection_mode with
268 | `SINGLE -> assert false
270 Http_daemon.send_basic_headers ~code:200 outchan ;
271 Http_daemon.send_CRLF outchan ;
274 let formatted_choices =
276 (List.map (fun uri -> sprintf "\"%s\"" uri) choices)
280 [title_tag_RE, title;
281 choices_tag_RE, formatted_choices;
283 id_to_uris_RE, id_to_uris_raw;
287 output_string outchan (processed_line ^ "\n"))
288 interactive_user_uri_choice_TPL;
289 raise Chat_unfinished))
291 let interactive_interpretation_choice interpretations =
292 let html_interpretations_labels =
297 (String.concat "<br />"
300 (sprintf "alias %s %s" id value))
305 let html_interpretations =
313 (sprintf "alias %s %s"
315 (MQueryMisc.wrong_xpointer_format_from_wrong_xpointer_format'
321 Http_daemon.send_basic_headers ~code:200 outchan ;
322 Http_daemon.send_CRLF outchan ;
327 [interpretations_RE, html_interpretations;
328 interpretations_labels_RE, html_interpretations_labels]
331 output_string outchan (processed_line ^ "\n"))
332 interactive_interpretation_choice_TPL;
333 raise Chat_unfinished
335 let input_or_locate_uri ~title =
336 UriManager.uri_of_string "cic:/Coq/Init/DataTypes/nat_ind.con"
340 let module Disambiguate' = Disambiguate.Make (Chat) in
341 let (id_to_uris', metasenv', term') =
342 Disambiguate'.disambiguate_input
343 context metasenv dom mk_metasenv_and_expr id_to_uris
345 (match metasenv' with
347 let must = MQueryLevels2.get_constraints term' in
348 let must',only = refine_constraints must in
349 let results = MQueryGenerator.searchPattern must' only in
350 Http_daemon.send_basic_headers ~code:200 outchan ;
351 Http_daemon.send_CRLF outchan ;
355 match id_to_uris' with
360 sprintf "\"alias %s cic:%s\""
362 CicTextualParser0.Id name -> name
363 | _ -> assert false (*CSC: completare *))
365 | None -> assert false
366 | Some (CicTextualParser0.Uri t) ->
367 MQueryMisc.string_of_cic_textual_parser_uri
369 | _ -> assert false (*CSC: completare *)))
374 [results_RE, theory_of_result results ;
375 new_aliases_RE, new_aliases]
378 output_string outchan (processed_line ^ "\n"))
380 | _ -> (* unable to instantiate some implicit variable *)
383 ~body:"some implicit variables are still unistantiated :-("
387 Http_daemon.respond_error ~status:(`Client_error `Bad_request) outchan);
388 if req#path <> "/getpage" then
390 debug_print (sprintf "%s done!" req#path)
392 | Chat_unfinished -> prerr_endline "Chat unfinished, Try again!"
393 | Http_types.Param_not_found attr_name ->
394 bad_request (sprintf "Parameter '%s' is missing" attr_name) outchan
397 ~body:(pp_error ("Uncaught exception: " ^ (Printexc.to_string exc)))
400 printf "%s started and listening on port %d\n" daemon_name port;
401 printf "Current directory is %s\n" (Sys.getcwd ());
402 printf "HTML directory is %s\n" pages_dir;
404 Unix.putenv "http_proxy" "";
405 Mqint.set_database Mqint.postgres_db;
406 Http_daemon.start' ~port callback;
407 printf "%s is terminating, bye!\n" daemon_name