2 * Copyright (C) 2000, HELM Team.
4 * This file is part of HELM, an Hypertextual, Electronic
5 * Library of Mathematics, developed at the Computer Science
6 * Department, University of Bologna, Italy.
8 * HELM is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * HELM is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with HELM; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
23 * For details, see the HELM World-Wide-Web page,
24 * http://cs.unibo.it/helm/.
27 (* TODO optimization: precompile almost all regexp *)
29 open Http_getter_common;;
30 open Http_getter_types;;
33 (* debugging settings *)
35 let debug_print s = if debug then prerr_endline ("[HTTP-Getter] " ^ s);;
36 let http_debug = false;;
37 Http_common.debug := http_debug;;
40 debug_print ("Downloading URL: " ^ url);
42 Some (Http_client.Convenience.http_get url)
43 with Http_client.Http_error (code, _) ->
45 (sprintf "Failed to download %s, HTTP response was %d" url code);
49 let parse_format (req: Http_types.request) =
51 (match req#param "format" with
52 | "normal" -> Enc_normal
54 | s -> raise (Http_getter_bad_request ("Invalid format: " ^ s)))
55 with Http_types.Param_not_found _ -> Enc_normal
57 let parse_patch_dtd (req: Http_types.request) =
59 (match req#param "patch_dtd" with
60 | s when String.lowercase s = "yes" -> true
61 | s when String.lowercase s = "no" -> false
62 | s -> raise (Http_getter_bad_request ("Invalid patch_dtd value: " ^ s)))
63 with Http_types.Param_not_found _ -> true
65 let parse_ls_format (req: Http_types.request) =
66 match req#param "format" with
67 | s when String.lowercase s = "txt" -> Fmt_text
68 | s when String.lowercase s = "xml" -> Fmt_xml
69 | s -> raise (Http_getter_bad_request ("Invalid /ls format: " ^ s))
71 let parse_ls_uri (req: Http_types.request) =
72 let baseuri = req#param "baseuri" in
74 Pcre.extract ~pat:"^(\\w+):(.*)$" (Pcre.replace ~pat:"/+$" baseuri)
76 match (subs.(1), subs.(2)) with
77 | "cic", uri -> Cic uri
78 | "theory", uri -> Theory uri
79 | _ -> raise (Http_getter_bad_request ("Invalid /ls baseuri: " ^ baseuri))
82 let xml_map = new Http_getter_map.map Http_getter_env.xml_dbm in
83 let rdf_map = new Http_getter_map.map Http_getter_env.rdf_dbm in
84 let xsl_map = new Http_getter_map.map Http_getter_env.xsl_dbm in
86 let resolve uri = (* use global maps *)
89 | uri when is_xml_uri uri -> xml_map
90 | uri when is_rdf_uri uri -> rdf_map
91 | uri when is_xsl_uri uri -> xsl_map
92 | uri -> raise (Http_getter_unresolvable_URI uri)
96 let return_all_foo_uris map doctype filter outchan =
97 Http_daemon.send_basic_headers outchan;
98 Http_daemon.send_header "Content-Type" "text/xml" outchan;
99 Http_daemon.send_CRLF outchan;
103 "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>
104 <!DOCTYPE %s SYSTEM \"%s/getdtd?uri=%s.dtd\">;
109 Http_getter_env.my_own_url
115 output_string outchan (sprintf "\t<uri value=\"%s\" />\n" uri));
116 output_string outchan (sprintf "</%s>\n" doctype)
118 let return_all_uris = return_all_foo_uris xml_map "alluris" in
119 let return_all_rdf_uris = return_all_foo_uris rdf_map "allrdfuris" in
121 let (++) (oldann, oldtypes, oldbody) (newann, newtypes, newbody) =
122 ((if newann > oldann then newann else oldann),
123 (if newtypes > oldtypes then newtypes else oldtypes),
124 (if newbody > oldbody then newbody else oldbody))
127 Pcre.regexp "^([^.]*\\.[^.]*)((\\.body)|(\\.types))?(\\.ann)?"
129 fun lsuri format outchan ->
131 "^" ^ (match lsuri with Cic p -> ("cic:" ^ p) | Theory p -> ("theory:" ^ p))
134 let objs = Hashtbl.create 17 in
135 xml_map#iter (* BLEARGH Dbm module lacks support for fold-like functions *)
137 | uri when Pcre.pmatch ~pat:(pat ^ "/") uri -> (* directory hit *)
139 List.hd (Pcre.split ~pat:"/" (Pcre.replace ~pat:(pat ^ "/") uri))
142 | uri when Pcre.pmatch ~pat:(pat ^ "(\\.|$)") uri -> (* object hit *)
143 let localpart = Pcre.replace ~pat:"^.*/" uri in
144 let basepart = Pcre.replace ~rex:basepartRE ~templ:"$1" localpart in
147 Hashtbl.find objs basepart
148 with Not_found -> (false, No, No) (* no ann, no types no body *)
152 | s when Pcre.pmatch ~pat:"\\.types" s -> (false, Yes, No)
153 | s when Pcre.pmatch ~pat:"\\.types.ann" s -> (true, Ann, No)
154 | s when Pcre.pmatch ~pat:"\\.body" s -> (false, No, Yes)
155 | s when Pcre.pmatch ~pat:"\\.body.ann" s -> (true, No, Ann)
158 (Http_getter_internal_error ("Invalid /ls localpart: " ^ s))
160 Hashtbl.replace objs basepart (oldflags ++ newflags)
161 | _ -> () (* miss *));
165 "dir, " ^ (String.concat "\ndir, " (List.sort compare !dirs)) ^ "\n" ^
166 (Http_getter_misc.hashtbl_sorted_fold
167 (fun uri (annflag, typesflag, bodyflag) cont ->
169 "%sobject, %s, <%s,%s,%s>\n"
170 cont uri (if annflag then "YES" else "NO")
171 (string_of_ls_flag typesflag) (string_of_ls_flag bodyflag))
173 in Http_daemon.respond ~headers:["Content-Type", "text/txt"] ~body outchan
177 "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>
178 <!DOCTYPE ls SYSTEM \"%s/getdtd?uri=ls.dtd\"
184 Http_getter_env.my_own_url
189 (fun d -> "<section>" ^ d ^ "</section>")
190 (List.sort compare !dirs))) ^ "\n" ^
191 (Http_getter_misc.hashtbl_sorted_fold
192 (fun uri (annflag, typesflag, bodyflag) cont ->
194 "%s<object name=\"%s\">
196 \t<types value=\"%s\">
197 \t<body value=\"%s\">
200 cont uri (if annflag then "YES" else "NO")
201 (string_of_ls_flag typesflag)
202 (string_of_ls_flag bodyflag))
204 in Http_daemon.respond ~headers:["Content-Type", "text/xml"] ~body outchan
206 let update_from_server logmsg server_url = (* use global maps *)
207 let xml_url_of_uri = function
208 (* TODO missing sanity checks on server_url, e.g. it can contains $1 *)
209 | uri when (Pcre.pmatch ~pat:"^cic://" uri) ->
210 Pcre.replace ~pat:"^cic://" ~templ:server_url uri
211 | uri when (Pcre.pmatch ~pat:"^theory://" uri) ->
212 Pcre.replace ~pat:"^theory://" ~templ:server_url uri
213 | uri -> raise (Http_getter_invalid_URI uri)
215 let rdf_url_of_uri = function (* TODO as above *)
216 | uri when (Pcre.pmatch ~pat:"^helm:rdf.*//cic:" uri) ->
217 Pcre.replace ~pat:"^helm:rdf.*//cic:" ~templ:server_url uri
218 | uri when (Pcre.pmatch ~pat:"^helm:rdf.*//theory:" uri) ->
219 Pcre.replace ~pat:"^helm:rdf.*//theory:" ~templ:server_url uri
220 | uri -> raise (Http_getter_invalid_URI uri)
222 let log = ref ("Processing server: " ^ server_url ^ "<br />\n") in
223 let (xml_index, rdf_index, xsl_index) =
224 (* TODO keeps index in memory, is better to keep them on temp files? *)
225 (http_get (server_url ^ "/" ^ Http_getter_env.xml_index),
226 http_get (server_url ^ "/" ^ Http_getter_env.rdf_index),
227 http_get (server_url ^ "/" ^ Http_getter_env.xsl_index))
229 if (xml_index = None && rdf_index = None && xsl_index = None) then
230 debug_print (sprintf "Warning: useless server %s" server_url);
231 (match xml_index with
233 (log := !log ^ "Updating XML db ...<br />\n";
237 (match Pcre.split ~pat:"[ \\t]+" l with
238 | [uri; "gz"] -> xml_map#add uri ((xml_url_of_uri uri) ^ ".xml.gz")
239 | [uri] -> xml_map#add uri ((xml_url_of_uri uri) ^ ".xml")
240 | _ -> log := !log ^ "Ignoring invalid line: " ^ l ^ "<br />\n")
241 with Http_getter_invalid_URI uri ->
242 log := !log ^ "Ignoring invalid XML URI: " ^ uri)
243 (Pcre.split ~pat:"\n+" xml_index)) (* xml_index lines *)
245 (match rdf_index with
247 (log := !log ^ "Updating RDF db ...<br />\n";
251 (match Pcre.split ~pat:"[ \\t]+" l with
252 | [uri; "gz"] -> rdf_map#add uri ((rdf_url_of_uri uri) ^ ".xml.gz")
253 | [uri] -> rdf_map#add uri ((rdf_url_of_uri uri) ^ ".xml")
254 | _ -> log := !log ^ "Ignoring invalid line: " ^ l ^ "<br />\n")
255 with Http_getter_invalid_URI uri ->
256 log := !log ^ "Ignoring invalid RDF URI: " ^ uri)
257 (Pcre.split ~pat:"\n+" rdf_index)) (* rdf_index lines *)
259 (match xsl_index with
261 (log := !log ^ "Updating XSLT db ...<br />\n";
263 (fun l -> xsl_map#add l (server_url ^ "/" ^ l))
264 (Pcre.split ~pat:"\n+" xsl_index);
265 log := !log ^ "All done!<br />\n")
271 let callback (req: Http_types.request) outchan =
273 debug_print ("Connection from " ^ req#clientAddr);
274 debug_print ("Received request: " ^ req#path);
276 | "/help" -> return_html_msg Http_getter_const.usage_string outchan
277 | "/getxml" | "/getxslt" | "/getdtd" | "/resolve" | "/register" ->
278 (let uri = req#param "uri" in (* common parameter *)
281 let enc = parse_format req in
282 let patch_dtd = parse_patch_dtd req in
283 Http_getter_cache.respond_xml
284 ~url:(resolve uri) ~uri ~enc ~patch_dtd outchan
286 (* let patch_dtd = parse_patch_dtd req in *)
287 (* TODO add support and default value for patch_dtd *)
288 Http_getter_cache.respond_xsl ~url:(resolve uri) outchan
290 let patch_dtd = parse_patch_dtd req in
291 Http_getter_cache.respond_dtd
292 ~patch_dtd ~url:(Http_getter_env.dtd_dir ^ "/" ^ uri) outchan
296 (sprintf "<url value=\"%s\" />\n" (resolve uri))
298 with Http_getter_unresolvable_URI uri ->
299 return_xml_msg "<unresolved />\n" outchan)
301 let url = req#param "url" in
303 return_html_msg "Register done" outchan
306 (xml_map#clear; rdf_map#clear; xsl_map#clear;
310 "" (* initial logmsg: empty *)
311 (* reverse order: 1st server is the most important one *)
312 (List.rev Http_getter_env.servers)
314 return_html_msg log outchan)
318 (Pcre.pmatch ~pat:"^cic:" uri) &&
319 not (Pcre.pmatch ~pat:"\\.types$" uri))
321 | "/getallrdfuris" ->
322 (let classs = req#param "class" in
325 let base = "^helm:rdf:www\\.cs\\.unibo\\.it/helm/rdf/" in
327 | ("forward" as c) | ("backward" as c) ->
328 (fun uri -> Pcre.pmatch ~pat:(base ^ c) uri)
329 | c -> raise (Http_getter_invalid_RDF_class c)
331 return_all_rdf_uris filter outchan
332 with Http_getter_invalid_RDF_class c ->
333 raise (Http_getter_bad_request ("Invalid RDF class: " ^ c)))
334 | "/ls" -> return_ls (parse_ls_uri req) (parse_ls_format req) outchan
336 Http_daemon.respond ~body:Http_getter_const.empty_xml outchan
338 Http_daemon.respond_error ~status:(`Client_error `Bad_request) outchan)
340 | Http_types.Param_not_found attr_name ->
341 return_400 (sprintf "Parameter '%s' is missing" attr_name) outchan
342 | Http_getter_bad_request msg -> return_html_error msg outchan
343 | Http_getter_internal_error msg -> return_html_internal_error msg outchan
346 ("Uncaught exception: " ^ (Printexc.to_string exc))
350 (* daemon initialization *)
351 Http_getter_env.dump_env ();
353 Unix.putenv "http_proxy" "";
355 ~timeout:None ~port:Http_getter_env.port ~mode:`Thread callback