(*
* Copyright (C) 2000, HELM Team.
*
* This file is part of HELM, an Hypertextual, Electronic
* Library of Mathematics, developed at the Computer Science
* Department, University of Bologna, Italy.
*
* HELM 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.
*
* HELM 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 HELM; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*
* For details, see the HELM World-Wide-Web page,
* http://cs.unibo.it/helm/.
*)
(* TODO optimization: precompile almost all regexp *)
open Http_getter_common;;
open Http_getter_types;;
open Printf;;
(* debugging settings *)
let debug = true;;
let debug_print s = if debug then prerr_endline ("[HTTP-Getter] " ^ s);;
let http_debug = false;;
Http_common.debug := http_debug;;
let http_get url =
debug_print ("Downloading URL: " ^ url);
try
Some (Http_client.Convenience.http_get url)
with Http_client.Http_error (code, _) ->
(debug_print
(sprintf "Failed to download %s, HTTP response was %d" url code);
None)
;;
let parse_format (req: Http_types.request) =
try
(match req#param "format" with
| "normal" -> Enc_normal
| "gz" -> Enc_gzipped
| s -> raise (Http_getter_bad_request ("Invalid format: " ^ s)))
with Http_types.Param_not_found _ -> Enc_normal
;;
let parse_patch_dtd (req: Http_types.request) =
try
(match req#param "patch_dtd" with
| s when String.lowercase s = "yes" -> true
| s when String.lowercase s = "no" -> false
| s -> raise (Http_getter_bad_request ("Invalid patch_dtd value: " ^ s)))
with Http_types.Param_not_found _ -> true
;;
let parse_ls_format (req: Http_types.request) =
match req#param "format" with
| s when String.lowercase s = "txt" -> Fmt_text
| s when String.lowercase s = "xml" -> Fmt_xml
| s -> raise (Http_getter_bad_request ("Invalid /ls format: " ^ s))
;;
let parse_ls_uri (req: Http_types.request) =
let baseuri = req#param "baseuri" in
let subs =
Pcre.extract ~pat:"^(\\w+):(.*)$" (Pcre.replace ~pat:"/+$" baseuri)
in
match (subs.(1), subs.(2)) with
| "cic", uri -> Cic uri
| "theory", uri -> Theory uri
| _ -> raise (Http_getter_bad_request ("Invalid /ls baseuri: " ^ baseuri))
;;
let xml_map = new Http_getter_map.map Http_getter_env.xml_dbm in
let rdf_map = new Http_getter_map.map Http_getter_env.rdf_dbm in
let xsl_map = new Http_getter_map.map Http_getter_env.xsl_dbm in
let resolve uri = (* use global maps *)
let map =
match uri with
| uri when is_xml_uri uri -> xml_map
| uri when is_rdf_uri uri -> rdf_map
| uri when is_xsl_uri uri -> xsl_map
| uri -> raise (Http_getter_unresolvable_URI uri)
in
map#resolve uri
in
let return_all_foo_uris map doctype filter outchan =
Http_daemon.send_basic_headers outchan;
Http_daemon.send_header "Content-Type" "text/xml" outchan;
Http_daemon.send_CRLF outchan;
output_string
outchan
(sprintf
"
;
<%s>
"
doctype
Http_getter_env.my_own_url
doctype
doctype);
map#iter
(fun uri _ ->
if filter uri then
output_string outchan (sprintf "\t\n" uri));
output_string outchan (sprintf "%s>\n" doctype)
in
let return_all_uris = return_all_foo_uris xml_map "alluris" in
let return_all_rdf_uris = return_all_foo_uris rdf_map "allrdfuris" in
let return_ls =
let (++) (oldann, oldtypes, oldbody) (newann, newtypes, newbody) =
((if newann > oldann then newann else oldann),
(if newtypes > oldtypes then newtypes else oldtypes),
(if newbody > oldbody then newbody else oldbody))
in
let basepartRE =
Pcre.regexp "^([^.]*\\.[^.]*)((\\.body)|(\\.types))?(\\.ann)?"
in
fun lsuri format outchan ->
let pat =
"^" ^ (match lsuri with Cic p -> ("cic:" ^ p) | Theory p -> ("theory:" ^ p))
in
let dirs = ref [] in
let objs = Hashtbl.create 17 in
xml_map#iter (* BLEARGH Dbm module lacks support for fold-like functions *)
(fun _ -> function
| uri when Pcre.pmatch ~pat:(pat ^ "/") uri -> (* directory hit *)
let dir =
List.hd (Pcre.split ~pat:"/" (Pcre.replace ~pat:(pat ^ "/") uri))
in
dirs := dir :: !dirs
| uri when Pcre.pmatch ~pat:(pat ^ "(\\.|$)") uri -> (* object hit *)
let localpart = Pcre.replace ~pat:"^.*/" uri in
let basepart = Pcre.replace ~rex:basepartRE ~templ:"$1" localpart in
let oldflags =
try
Hashtbl.find objs basepart
with Not_found -> (false, No, No) (* no ann, no types no body *)
in
let newflags =
match localpart with
| s when Pcre.pmatch ~pat:"\\.types" s -> (false, Yes, No)
| s when Pcre.pmatch ~pat:"\\.types.ann" s -> (true, Ann, No)
| s when Pcre.pmatch ~pat:"\\.body" s -> (false, No, Yes)
| s when Pcre.pmatch ~pat:"\\.body.ann" s -> (true, No, Ann)
| s ->
raise
(Http_getter_internal_error ("Invalid /ls localpart: " ^ s))
in
Hashtbl.replace objs basepart (oldflags ++ newflags)
| _ -> () (* miss *));
match format with
| Fmt_text ->
let body =
"dir, " ^ (String.concat "\ndir, " (List.sort compare !dirs)) ^ "\n" ^
(Http_getter_misc.hashtbl_sorted_fold
(fun uri (annflag, typesflag, bodyflag) cont ->
sprintf
"%sobject, %s, <%s,%s,%s>\n"
cont uri (if annflag then "YES" else "NO")
(string_of_ls_flag typesflag) (string_of_ls_flag bodyflag))
objs "")
in Http_daemon.respond ~headers:["Content-Type", "text/txt"] ~body outchan
| Fmt_xml ->
let body =
sprintf
"
%s
"
Http_getter_env.my_own_url
("\n" ^
(String.concat
"\n"
(List.map
(fun d -> "" ^ d ^ "")
(List.sort compare !dirs))) ^ "\n" ^
(Http_getter_misc.hashtbl_sorted_fold
(fun uri (annflag, typesflag, bodyflag) cont ->
sprintf
"%s
"
cont uri (if annflag then "YES" else "NO")
(string_of_ls_flag typesflag)
(string_of_ls_flag bodyflag))
objs ""))
in Http_daemon.respond ~headers:["Content-Type", "text/xml"] ~body outchan
in
let update_from_server logmsg server_url = (* use global maps *)
let xml_url_of_uri = function
(* TODO missing sanity checks on server_url, e.g. it can contains $1 *)
| uri when (Pcre.pmatch ~pat:"^cic://" uri) ->
Pcre.replace ~pat:"^cic://" ~templ:server_url uri
| uri when (Pcre.pmatch ~pat:"^theory://" uri) ->
Pcre.replace ~pat:"^theory://" ~templ:server_url uri
| uri -> raise (Http_getter_invalid_URI uri)
in
let rdf_url_of_uri = function (* TODO as above *)
| uri when (Pcre.pmatch ~pat:"^helm:rdf.*//cic:" uri) ->
Pcre.replace ~pat:"^helm:rdf.*//cic:" ~templ:server_url uri
| uri when (Pcre.pmatch ~pat:"^helm:rdf.*//theory:" uri) ->
Pcre.replace ~pat:"^helm:rdf.*//theory:" ~templ:server_url uri
| uri -> raise (Http_getter_invalid_URI uri)
in
let log = ref ("Processing server: " ^ server_url ^ " \n") in
let (xml_index, rdf_index, xsl_index) =
(* TODO keeps index in memory, is better to keep them on temp files? *)
(http_get (server_url ^ "/" ^ Http_getter_env.xml_index),
http_get (server_url ^ "/" ^ Http_getter_env.rdf_index),
http_get (server_url ^ "/" ^ Http_getter_env.xsl_index))
in
if (xml_index = None && rdf_index = None && xsl_index = None) then
debug_print (sprintf "Warning: useless server %s" server_url);
(match xml_index with
| Some xml_index ->
(log := !log ^ "Updating XML db ... \n";
List.iter
(fun l ->
try
(match Pcre.split ~pat:"[ \\t]+" l with
| [uri; "gz"] -> xml_map#add uri ((xml_url_of_uri uri) ^ ".xml.gz")
| [uri] -> xml_map#add uri ((xml_url_of_uri uri) ^ ".xml")
| _ -> log := !log ^ "Ignoring invalid line: " ^ l ^ " \n")
with Http_getter_invalid_URI uri ->
log := !log ^ "Ignoring invalid XML URI: " ^ uri)
(Pcre.split ~pat:"\n+" xml_index)) (* xml_index lines *)
| None -> ());
(match rdf_index with
| Some rdf_index ->
(log := !log ^ "Updating RDF db ... \n";
List.iter
(fun l ->
try
(match Pcre.split ~pat:"[ \\t]+" l with
| [uri; "gz"] -> rdf_map#add uri ((rdf_url_of_uri uri) ^ ".xml.gz")
| [uri] -> rdf_map#add uri ((rdf_url_of_uri uri) ^ ".xml")
| _ -> log := !log ^ "Ignoring invalid line: " ^ l ^ " \n")
with Http_getter_invalid_URI uri ->
log := !log ^ "Ignoring invalid RDF URI: " ^ uri)
(Pcre.split ~pat:"\n+" rdf_index)) (* rdf_index lines *)
| None -> ());
(match xsl_index with
| Some xsl_index ->
(log := !log ^ "Updating XSLT db ... \n";
List.iter
(fun l -> xsl_map#add l (server_url ^ "/" ^ l))
(Pcre.split ~pat:"\n+" xsl_index);
log := !log ^ "All done! \n")
| None -> ());
!log
in
(* thread action *)
let callback (req: Http_types.request) outchan =
try
debug_print ("Connection from " ^ req#clientAddr);
debug_print ("Received request: " ^ req#path);
(match req#path with
| "/help" -> return_html_msg Http_getter_const.usage_string outchan
| "/getxml" | "/getxslt" | "/getdtd" | "/resolve" | "/register" ->
(let uri = req#param "uri" in (* common parameter *)
match req#path with
| "/getxml" ->
let enc = parse_format req in
let patch_dtd = parse_patch_dtd req in
Http_getter_cache.respond_xml
~url:(resolve uri) ~uri ~enc ~patch_dtd outchan
| "/getxslt" ->
(* let patch_dtd = parse_patch_dtd req in *)
(* TODO add support and default value for patch_dtd *)
Http_getter_cache.respond_xsl ~url:(resolve uri) outchan
| "/getdtd" ->
let patch_dtd = parse_patch_dtd req in
Http_getter_cache.respond_dtd
~patch_dtd ~url:(Http_getter_env.dtd_dir ^ "/" ^ uri) outchan
| "/resolve" ->
(try
return_xml_msg
(sprintf "\n" (resolve uri))
outchan
with Http_getter_unresolvable_URI uri ->
return_xml_msg "\n" outchan)
| "/register" ->
let url = req#param "url" in
xml_map#add uri url;
return_html_msg "Register done" outchan
| _ -> assert false)
| "/update" ->
(xml_map#clear; rdf_map#clear; xsl_map#clear;
let log =
List.fold_left
update_from_server
"" (* initial logmsg: empty *)
(* reverse order: 1st server is the most important one *)
(List.rev Http_getter_env.servers)
in
return_html_msg log outchan)
| "/getalluris" ->
return_all_uris
(fun uri ->
(Pcre.pmatch ~pat:"^cic:" uri) &&
not (Pcre.pmatch ~pat:"\\.types$" uri))
outchan
| "/getallrdfuris" ->
(let classs = req#param "class" in
try
let filter =
let base = "^helm:rdf:www\\.cs\\.unibo\\.it/helm/rdf/" in
match classs with
| ("forward" as c) | ("backward" as c) ->
(fun uri -> Pcre.pmatch ~pat:(base ^ c) uri)
| c -> raise (Http_getter_invalid_RDF_class c)
in
return_all_rdf_uris filter outchan
with Http_getter_invalid_RDF_class c ->
raise (Http_getter_bad_request ("Invalid RDF class: " ^ c)))
| "/ls" -> return_ls (parse_ls_uri req) (parse_ls_format req) outchan
| "/getempty" ->
Http_daemon.respond ~body:Http_getter_const.empty_xml outchan
| invalid_request ->
Http_daemon.respond_error ~status:(`Client_error `Bad_request) outchan)
with
| Http_types.Param_not_found attr_name ->
return_400 (sprintf "Parameter '%s' is missing" attr_name) outchan
| Http_getter_bad_request msg -> return_html_error msg outchan
| Http_getter_internal_error msg -> return_html_internal_error msg outchan
| exc ->
return_html_error
("Uncaught exception: " ^ (Printexc.to_string exc))
outchan
in
(* daemon initialization *)
Http_getter_env.dump_env ();
flush stdout;
Unix.putenv "http_proxy" "";
Http_daemon.start'
~timeout:None ~port:Http_getter_env.port ~mode:`Thread callback