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 1.5 2006/03/27 16:43:44 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) list;
38 (* (sectionname, divname, content)
39 * for each section. *)
42 exception SaveURLError
43 exception SaveConflict of int32 * int32 * string * string
49 | Title title -> title in
51 let model = { id = 0l;
53 description = description;
58 let new_page_with_title title =
59 (* Initial page contents. *)
60 let contents = [ None, None, "<b>" ^ title ^ "</b> is " ] in
61 let model = { id = 0l;
65 contents_ = contents } in
68 let load_page dbh hostid ~url ?version () =
69 (* Pull out the page itself from the database. *)
73 PGSQL(dbh) "select id, title, description, redirect
75 where hostid = $hostid and url = $url"
77 PGSQL(dbh) "select id, title, description, redirect
79 where hostid = $hostid and id = $version and
80 (url = $url or url_deleted = $url)" in
82 let pageid, title, description, redirect =
85 | _ -> raise Not_found in
87 (* Get the sections. *)
88 let contents = PGSQL(dbh)
89 "select sectionname, divname, content
91 where pageid = $pageid
94 let model = { id = pageid;
96 description = description;
98 contents_ = contents } in
101 let save_page dbh hostid ?user ?r model =
102 (* Logging information, if available. *)
108 | User (id, _, _, _) -> Some id
115 try Some (Connection.remote_ip (Request.connection r))
116 with Not_found -> None in
119 (* Creating a new page (id = 0)? If so, we're just going to insert
120 * a new row, which is easy.
122 if model.id = 0l then (
123 (* Create the page title or URL. *)
128 match Wikilib.generate_url_of_title dbh hostid title with
129 Wikilib.GenURL_OK url -> url, title
131 raise SaveURLError in
133 let description = model.description in
134 let redirect = model.redirect in
135 PGSQL(dbh) "insert into pages (hostid, url, title,
136 description, logged_ip, logged_user,
138 values ($hostid, $url, $title, $description,
139 $?logged_ip, $?logged_user, $?redirect)";
141 let pageid = PGOCaml.serial4 dbh "pages_id_seq" in
143 (* Create the page contents. *)
144 let ordering = ref 0 in (* Creating new ordering. *)
146 fun (sectionname, divname, content) ->
147 incr ordering; let ordering = Int32.of_int !ordering in
149 "insert into contents (pageid, ordering, sectionname, divname,
151 values ($pageid, $ordering,
152 $?sectionname, $?divname, $content)"
157 (* Otherwise it's an old page which we're updating. *)
159 (* Pull out fields from the database. *)
160 let model_id = model.id in
163 "select creation_date, coalesce (url, url_deleted),
166 where hostid = $hostid and id = $model_id" in
168 let creation_date, url, title, css =
171 | _ -> assert false in
172 let url = Option.get url in
177 | Title new_title when title <> new_title -> new_title
180 (* Has someone else edited this page in the meantime? *)
181 let max_id = Option.get (
183 PGSQL(dbh) "select max(id) from pages
184 where hostid = $hostid and url = $url"
188 let edited = max_id <> model_id in
191 let css = match css with None -> "" | Some css -> css in
192 raise (SaveConflict (max_id, model_id, url, css))
195 (* Defer the pages_redirect_cn constraint because that would
196 * temporarily fail on the next UPDATE.
200 pages_redirect_cn, sitemenu_url_cn,
201 page_emails_url_cn, links_from_cn, recently_visited_url_cn
204 (* Mark the old page as deleted. NB. There is a small race
205 * condition here because PostgreSQL doesn't do isolation
206 * properly. If a user tries to visit this page between the
207 * delete and the creation of the new page, then they'll get
208 * a page not found error. (XXX)
210 PGSQL(dbh) "update pages set url_deleted = url, url = null
211 where hostid = $hostid and id = $model_id";
213 let description = model.description in
214 let redirect = model.redirect in
216 "insert into pages (hostid, url, title,
217 description, creation_date, logged_ip,
218 logged_user, redirect, css)
219 values ($hostid, $url, $title, $description, $creation_date,
220 $?logged_ip, $?logged_user, $?redirect, $?css)";
222 (* New page ID <> old page ID model.id. *)
223 let pageid = PGOCaml.serial4 dbh "pages_id_seq" in
225 (* Create the page contents. *)
226 let ordering = ref 0 in (* Creating new ordering. *)
228 fun (sectionname, divname, content) ->
229 incr ordering; let ordering = Int32.of_int !ordering in
230 PGSQL(dbh) "insert into contents (pageid,
231 ordering, sectionname, divname, content)
232 values ($pageid, $ordering, $?sectionname,
233 $?divname, $content)"
239 (* Keep the links table in synch. *)
240 Cocanwiki_links.update_links_for_page dbh hostid url;