2 (* Copyright (C) 2002, 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 quando si prova ad applicare uno stylesheet che non e' stato caricato
28 viene lasciata passare una eccezione Not_found *)
33 (* debugging settings *)
35 let debug_level = `Debug;;
36 let debug_print s = if debug then prerr_endline s;;
37 let http_debug = false;;
38 Http_common.debug := http_debug;;
40 (* environment settings *)
41 let daemon_name = "UWOBO OCaml";;
42 let default_port = 8082;;
43 let port_env_var = "UWOBO_PORT";;
44 let default_media_type = "text/html";;
45 let default_encoding = "utf8";;
48 int_of_string (Sys.getenv port_env_var)
50 | Not_found -> default_port
51 | Failure "int_of_string" ->
52 prerr_endline "Warning: invalid port, reverting to default";
57 let pp_error = sprintf "<html><body><h1>Error: %s</h1></body></html>" in
58 let return_error msg outchan =
59 (* return an ok (200) http response, which display in html an error message *)
60 Http_daemon.respond ~body:(pp_error msg) outchan
62 let bad_request body outchan = (* return a bad request http response *)
63 Http_daemon.respond_error ~status:(`Client_error `Bad_request) ~body outchan
66 (* values common to all threads *)
67 let syslogger = new Uwobo_logger.sysLogger ~level:debug_level () in
69 let styles = new Uwobo_styles.styles in
70 let usage_string = "Help message: not yet written!!" in (* TODO *)
73 let callback req outchan =
74 (* perform an 'action' that can be applied to a list of keys or, if no
75 keys was given, to all keys *)
76 let act_on_keys req styles outchan per_key_action all_keys_action logmsg =
77 let log = new Uwobo_logger.processingLogger () in
80 Pcre.split ~pat:"," (req#param "keys")
81 with Http_request.Param_not_found _ -> []
84 | [] -> (* no key provided, act on all stylesheets *)
85 log#log "reloading all stylesheets ...";
86 (try all_keys_action () with e -> log#log (Printexc.to_string e))
89 (fun key -> (* act on a single stylesheet *)
90 log#log (sprintf "%s stylesheet %s" logmsg key);
91 (try per_key_action key with e -> log#log (Printexc.to_string e)))
93 Http_daemon.respond ~body:log#asHtml outchan
95 let parse_apply_params = (* parse parameters for '/apply' action *)
96 let is_global_param x = Pcre.pmatch ~pat:"^param(\\.[^.]+){1}$" x in
97 let is_local_param x = Pcre.pmatch ~pat:"^param(\\.[^.]+){2}$" x in
98 let is_property x = Pcre.pmatch ~pat:"^prop\\.[^.]+$" x in
100 (fun (old_params, old_properties) (name, value) ->
102 | name when is_global_param name ->
103 let name = Pcre.replace ~pat:"^param\\." name in
104 ((fun x -> (old_params x) @ [name, value]), old_properties)
105 | name when is_local_param name ->
106 let pieces = Pcre.extract ~pat:"^param\\.([^.]+)\\.(.*)" name in
107 let (key, name) = (pieces.(1), pieces.(2)) in
109 | x when x = key -> [name, value] @ (old_params x)
110 | x -> old_params x),
112 | name when is_property name ->
113 let name = Pcre.replace ~pat:"^prop\\." name in
114 (old_params, ((name, value) :: old_properties))
115 | _ -> (old_params, old_properties))
116 ((fun _ -> []), []) (* no parameters, no properties *)
119 syslogger#log `Debug (sprintf "Received request: %s" req#path);
122 (let bindings = req#paramAll "bind" in
123 if bindings = [] then
124 return_error "No [key,stylesheet] binding provided" outchan
126 let log = new Uwobo_logger.processingLogger () in
128 (fun binding -> (* add a <key, stylesheet> binding *)
129 let pieces = Pcre.split ~pat:"," binding in
132 log#log (sprintf "adding binding <%s,%s>" key style);
134 styles#add key style;
136 log#log (Printexc.to_string e))
137 | _ -> log#log (sprintf "invalid binding %s" binding))
139 Http_daemon.respond ~body:log#asHtml outchan
142 (let log = new Uwobo_logger.processingLogger () in
143 log#log "Stylesheet list:";
144 List.iter (fun s -> log#log s) styles#list;
145 Http_daemon.respond ~body:log#asHtml outchan)
149 styles#remove (fun () -> styles#removeAll) "removing"
153 styles#reload (fun () -> styles#reloadAll) "reloading"
155 if Unix.fork () = 0 then
156 (let logger = new Uwobo_logger.processingLogger () in
157 let xmluri = req#param "xmluri" in
158 let keys = Pcre.split ~pat:"," (req#param "keys") in
159 (* notation: "local" parameters are those defined on a per-stylesheet
160 pasis (i.e. param.key.param=value), "global" parameters are those
161 defined for all stylesheets (i.e. param.param=value) *)
162 let (params, props) = parse_apply_params req#params in
163 syslogger#log `Debug (sprintf "Parsing input document %s ..." xmluri);
164 let domImpl = Gdome.domImplementation () in
165 let input = domImpl#createDocumentFromURI ~uri:xmluri () in
166 syslogger#log `Debug "Applying stylesheet chain ...";
168 let (write_result, media_type, encoding) = (* out_channel -> unit *)
170 ~logger:syslogger ~styles ~keys ~input ~params ~props
172 let content_type = (* value of Content-Type HTTP response header *)
175 (match media_type with None -> default_media_type | Some t -> t)
176 (match encoding with None -> default_encoding | Some e -> e)
181 "sending output to client (Content-Type: %s)...."
183 Http_daemon.send_basic_headers ~code:200 outchan;
184 Http_daemon.send_header "Content-Type" content_type outchan;
185 Http_daemon.send_CRLF outchan;
187 with Uwobo_failure errmsg ->
189 (sprintf "Stylesheet chain application failed: %s" errmsg)
191 | "/help" -> Http_daemon.respond ~body:usage_string outchan
193 Http_daemon.respond_error ~status:(`Client_error `Bad_request) outchan)
195 | Http_request.Param_not_found attr_name ->
196 bad_request (sprintf "Parameter '%s' is missing" attr_name) outchan
199 ~body:(pp_error ("Uncaught exception: " ^ (Printexc.to_string exc)))
203 (* daemon initialization *)
206 (sprintf "%s started and listening on port %d" daemon_name port);
207 syslogger#log `Notice (sprintf "current directory is %s" (Sys.getcwd ()));
208 Http_daemon.start' ~port ~mode:`Thread callback;
209 syslogger#log `Notice (sprintf "%s is terminating, bye!" daemon_name)