1 (* COCANWIKI - a wiki written in Objective CAML.
2 * Written by Richard W.M. Jones <rich@merjis.com>.
3 * Copyright (C) 2004 Merjis Ltd.
4 * $Id: cocanwiki_pages.ml,v 1.7 2006/07/27 16:46:55 rich Exp $
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING. If not, write to
18 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
25 open Cocanwiki_strings
27 type pt = Page of string | Title of string
30 id : int32; (* Original page ID (0 = none). *)
31 pt : pt; (* Page of title (only used if id=0) *)
32 description : string; (* Description. *)
33 redirect : string option; (* Redirect to. *)
34 (* NB. Don't call this 'contents' because that clashes with the
35 * Pervasives.contents fields of the ref type.
37 contents_ : (string option * string option * string option * string) list;
38 (* (sectionname, divname, jsgo, content) for each section. *)
41 exception SaveURLError
42 exception SaveConflict of int32 * int32 * string * string
48 | Title title -> title in
50 let model = { id = 0l;
52 description = description;
57 let new_page_with_title title =
58 (* Initial page contents. *)
59 let contents = [ None, None, None, "<b>" ^ title ^ "</b> is " ] in
60 let model = { id = 0l;
64 contents_ = contents } in
67 let load_page dbh hostid ~url ?version () =
68 (* Pull out the page itself from the database. *)
72 PGSQL(dbh) "select id, title, description, redirect
74 where hostid = $hostid and url = $url"
76 PGSQL(dbh) "select id, title, description, redirect
78 where hostid = $hostid and id = $version and
79 (url = $url or url_deleted = $url)" in
81 let pageid, title, description, redirect =
84 | _ -> raise Not_found in
86 (* Get the sections. *)
87 let contents = PGSQL(dbh)
88 "select sectionname, divname, jsgo, content
90 where pageid = $pageid
93 let model = { id = pageid;
95 description = description;
97 contents_ = contents } in
100 let save_page r dbh hostid ?user model =
101 (* Logging information, if available. *)
107 | User (id, _, _, _) -> Some id
111 try Some (Connection.remote_ip (Request.connection r))
112 with Not_found -> None in
115 (* Creating a new page (id = 0)? If so, we're just going to insert
116 * a new row, which is easy.
118 if model.id = 0l then (
119 (* Create the page title or URL. *)
124 match Wikilib.generate_url_of_title r dbh hostid title with
125 Wikilib.GenURL_OK url -> url, title
127 raise SaveURLError in
129 let description = model.description in
130 let redirect = model.redirect in
131 PGSQL(dbh) "insert into pages (hostid, url, title,
132 description, logged_ip, logged_user,
134 values ($hostid, $url, $title, $description,
135 $?logged_ip, $?logged_user, $?redirect)";
137 let pageid = PGOCaml.serial4 dbh "pages_id_seq" in
139 (* Create the page contents. *)
140 let ordering = ref 0 in (* Creating new ordering. *)
142 fun (sectionname, divname, jsgo, content) ->
143 incr ordering; let ordering = Int32.of_int !ordering in
145 "insert into contents (pageid, ordering, sectionname, divname,
147 values ($pageid, $ordering,
148 $?sectionname, $?divname, $?jsgo, $content)"
153 (* Otherwise it's an old page which we're updating. *)
155 (* Pull out fields from the database. *)
156 let model_id = model.id in
159 "select creation_date, coalesce (url, url_deleted),
162 where hostid = $hostid and id = $model_id" in
164 let creation_date, url, title, css =
167 | _ -> assert false in
168 let url = Option.get url in
173 | Title new_title when title <> new_title -> new_title
176 (* Has someone else edited this page in the meantime? *)
177 let max_id = Option.get (
179 PGSQL(dbh) "select max(id) from pages
180 where hostid = $hostid and url = $url"
184 let edited = max_id <> model_id in
187 let css = match css with None -> "" | Some css -> css in
188 raise (SaveConflict (max_id, model_id, url, css))
191 (* Defer the pages_redirect_cn constraint because that would
192 * temporarily fail on the next UPDATE.
196 pages_redirect_cn, sitemenu_url_cn,
197 page_emails_url_cn, links_from_cn, recently_visited_url_cn
200 (* Mark the old page as deleted. NB. There is a small race
201 * condition here because PostgreSQL doesn't do isolation
202 * properly. If a user tries to visit this page between the
203 * delete and the creation of the new page, then they'll get
204 * a page not found error. (XXX)
206 PGSQL(dbh) "update pages set url_deleted = url, url = null
207 where hostid = $hostid and id = $model_id";
209 let description = model.description in
210 let redirect = model.redirect in
212 "insert into pages (hostid, url, title,
213 description, creation_date, logged_ip,
214 logged_user, redirect, css)
215 values ($hostid, $url, $title, $description, $creation_date,
216 $?logged_ip, $?logged_user, $?redirect, $?css)";
218 (* New page ID <> old page ID model.id. *)
219 let pageid = PGOCaml.serial4 dbh "pages_id_seq" in
221 (* Create the page contents. *)
222 let ordering = ref 0 in (* Creating new ordering. *)
224 fun (sectionname, divname, jsgo, content) ->
225 incr ordering; let ordering = Int32.of_int !ordering in
226 PGSQL(dbh) "insert into contents (pageid,
227 ordering, sectionname, divname, jsgo, content)
228 values ($pageid, $ordering, $?sectionname,
229 $?divname, $?jsgo, $content)"
235 (* Keep the links table in synch. *)
236 Cocanwiki_links.update_links_for_page r dbh hostid url;