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 1.8 2006/08/04 12:20:07 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 string option * string option * string option * string
31 (* (sectionname, divname, jsgo, content) *)
34 id : int32; (* Original page ID (0 = none). *)
35 pt : pt; (* Page of title (only used if id=0) *)
36 description : string; (* Description. *)
37 redirect : string option; (* Redirect to. *)
38 (* NB. Don't call this 'contents' because that clashes with the
39 * Pervasives.contents fields of the ref type.
41 contents_ : section list;
44 exception SaveURLError
45 exception SaveConflict of int32 * int32 * string * string option
51 | Title title -> title in
53 let model = { id = 0l;
55 description = description;
60 let new_page_with_title title =
61 (* Initial page contents. *)
62 let contents = [ None, None, None, "<b>" ^ title ^ "</b> is " ] in
63 let model = { id = 0l;
67 contents_ = contents } in
70 let load_page dbh hostid ~url ?version () =
71 (* Pull out the page itself from the database. *)
75 PGSQL(dbh) "select id, title, description, redirect
77 where hostid = $hostid and url = $url"
79 PGSQL(dbh) "select id, title, description, redirect
81 where hostid = $hostid and id = $version and
82 (url = $url or url_deleted = $url)" in
84 let pageid, title, description, redirect =
87 | _ -> raise Not_found in
89 (* Get the sections. *)
90 let contents = PGSQL(dbh)
91 "select sectionname, divname, jsgo, content
93 where pageid = $pageid
96 let model = { id = pageid;
98 description = description;
100 contents_ = contents } in
103 let save_page r dbh hostid ?user model =
104 (* Logging information, if available. *)
110 | User (id, _, _, _) -> Some id
114 try Some (Connection.remote_ip (Request.connection r))
115 with Not_found -> None in
118 (* Creating a new page (id = 0)? If so, we're just going to insert
119 * a new row, which is easy.
121 if model.id = 0l then (
122 (* Create the page title or URL. *)
127 match Wikilib.generate_url_of_title r dbh hostid title with
128 Wikilib.GenURL_OK url -> url, title
130 raise SaveURLError in
132 let description = model.description in
133 let redirect = model.redirect in
134 PGSQL(dbh) "insert into pages (hostid, url, title,
135 description, logged_ip, logged_user,
137 values ($hostid, $url, $title, $description,
138 $?logged_ip, $?logged_user, $?redirect)";
140 let pageid = PGOCaml.serial4 dbh "pages_id_seq" in
142 (* Create the page contents. *)
143 let ordering = ref 0 in (* Creating new ordering. *)
145 fun (sectionname, divname, jsgo, content) ->
146 incr ordering; let ordering = Int32.of_int !ordering in
148 "insert into contents (pageid, ordering, sectionname, divname,
150 values ($pageid, $ordering,
151 $?sectionname, $?divname, $?jsgo, $content)"
156 (* Otherwise it's an old page which we're updating. *)
158 (* Pull out fields from the database. *)
159 let model_id = model.id in
162 "select creation_date, coalesce (url, url_deleted),
165 where hostid = $hostid and id = $model_id" in
167 let creation_date, url, title, css =
170 | _ -> assert false in
171 let url = Option.get url in
176 | Title new_title when title <> new_title -> new_title
179 (* Has someone else edited this page in the meantime? *)
180 let max_id = Option.get (
182 PGSQL(dbh) "select max(id) from pages
183 where hostid = $hostid and url = $url"
187 let edited = max_id <> model_id in
190 raise (SaveConflict (max_id, model_id, url, css));
192 (* Defer the pages_redirect_cn constraint because that would
193 * temporarily fail on the next UPDATE.
197 pages_redirect_cn, sitemenu_url_cn,
198 page_emails_url_cn, links_from_cn, recently_visited_url_cn
201 (* Mark the old page as deleted. NB. There is a small race
202 * condition here because PostgreSQL doesn't do isolation
203 * properly. If a user tries to visit this page between the
204 * delete and the creation of the new page, then they'll get
205 * a page not found error. (XXX)
207 PGSQL(dbh) "update pages set url_deleted = url, url = null
208 where hostid = $hostid and id = $model_id";
210 let description = model.description in
211 let redirect = model.redirect in
213 "insert into pages (hostid, url, title,
214 description, creation_date, logged_ip,
215 logged_user, redirect, css)
216 values ($hostid, $url, $title, $description, $creation_date,
217 $?logged_ip, $?logged_user, $?redirect, $?css)";
219 (* New page ID <> old page ID model.id. *)
220 let pageid = PGOCaml.serial4 dbh "pages_id_seq" in
222 (* Create the page contents. *)
223 let ordering = ref 0 in (* Creating new ordering. *)
225 fun (sectionname, divname, jsgo, content) ->
226 incr ordering; let ordering = Int32.of_int !ordering in
227 PGSQL(dbh) "insert into contents (pageid,
228 ordering, sectionname, divname, jsgo, content)
229 values ($pageid, $ordering, $?sectionname,
230 $?divname, $?jsgo, $content)"
236 (* Keep the links table in synch. *)
237 Cocanwiki_links.update_links_for_page r dbh hostid url;