2 * Written by Richard W.M. Jones <rich@merjis.com>.
3 * Copyright (C) 2004 Merjis Ltd.
4 * $Id: page.ml,v 1.1 2004/09/07 10:14:09 rich Exp $
19 let template_page = get_template "page.html"
20 let template_404 = get_template "page_404.html"
22 (* Maximum level of redirection. *)
25 type fp_status = FPOK of int * string * string * Dbi.datetime * bool
26 | FPRedirect of string
29 let run r (q : cgi) (dbh : Dbi.connection) (hostid, _) _ =
30 let page = q#param "page" in
31 let page = if page = "" then "index" else page in
33 (* Host-specific CSS? *)
34 let sth = dbh#prepare_cached "select css is not null from hosts
36 sth#execute [`Int hostid];
38 match sth#fetch1 () with
39 | [ `Bool has_host_css ] -> has_host_css
40 | _ -> assert false in
42 (* This code generates ordinary pages. *)
43 let make_page title description pageid last_modified_date has_page_css
45 let t = template_page in
47 t#set "description" description;
48 t#set "pageid" (string_of_int pageid);
49 t#set "last_modified_date" (printable_date last_modified_date);
50 t#set "cocanwiki_package" Cocanwiki_version.package;
51 t#set "cocanwiki_version" Cocanwiki_version.version;
53 if page <> page' then (* redirection *) (
55 t#set "original_page" page; (* XXX title - get it from database *)
56 t#conditional "redirected" true
59 t#conditional "redirected" false
62 t#conditional "has_host_css" has_host_css;
63 t#conditional "has_page_css" has_page_css;
65 (* Pull out the sections in this page. *)
66 let sth = dbh#prepare_cached
67 "select ordering, sectionname, content, divname
71 sth#execute [`Int pageid];
75 (function [`Int ordering; `String sectionname; `String content;
76 (`Null | `String _) as divname] ->
77 let divname, has_divname =
80 | `String divname -> divname, true in
81 [ "ordering", Template.VarString (string_of_int ordering);
82 "sectionname", Template.VarString sectionname;
85 (Wikilib.xhtml_of_content dbh hostid content);
86 "has_divname", Template.VarConditional has_divname;
87 "divname", Template.VarString divname ]
88 | _ -> assert false) in
90 t#table "sections" sections;
92 (* Are we showing an old version of the page? If so, warn. *)
95 t#conditional "is_old_version" false
97 t#conditional "is_old_version" true;
98 t#set "old_version" (string_of_int pageid));
103 (* This code generates 404 pages. *)
105 Request.set_status r 404; (* Return a 404 error code. *)
107 let t = template_404 in
113 ('a'..'z' | 'A'..'Z' | '0'..'9') as c -> c
116 template_404#set "search_terms" search_terms;
121 (* Fetch a page by name. This function can give three answers:
122 * (1) Page fetched OK (fetches some details of the page).
123 * (2) Page is a redirect (fetches the name of the redirect page).
124 * (3) Page not found in database, ie. 404 error.
126 (* XXX Should do a case-insensitive matching of URLs, and if the URL differs
127 * in case only should redirect to the lowercase version.
129 let fetch_page page version allow_redirect =
132 if allow_redirect then (
135 "select redirect, id, title, description, last_modified_date,
137 from pages where hostid = ? and url = ?" in
138 sth#execute [`Int hostid; `String page];
140 (match sth#fetch1 () with
141 | [ `Null; `Int id; `String title; `String description;
142 `Timestamp last_modified_date; `Bool has_page_css ] ->
143 FPOK (id, title, description, last_modified_date,
145 | `String redirect :: _ ->
149 Not_found -> FPNotFound)
150 ) else (* redirects not allowed ... *) (
153 "select id, title, description, last_modified_date,
155 from pages where hostid = ? and url = ?" in
156 sth#execute [`Int hostid; `String page];
158 (match sth#fetch1 () with
159 | [ `Int id; `String title; `String description;
160 `Timestamp last_modified_date; `Bool has_page_css ] ->
161 FPOK (id, title, description, last_modified_date,
165 Not_found -> FPNotFound)
170 "select id, title, description, last_modified_date,
173 where hostid = ? and id = ? and
174 (url = ? or url_deleted = ?)" in
175 sth#execute [`Int hostid; `Int version;
176 `String page; `String page];
178 (match sth#fetch1 () with
179 | [ `Int id; `String title; `String description;
180 `Timestamp last_modified_date; `Bool has_page_css ] ->
181 FPOK (id, title, description, last_modified_date,
185 Not_found -> FPNotFound)
188 (* Here we deal with the complex business of redirects and versions. *)
189 let allow_redirect = not (q#param_true "no_redirect") in
191 try Some (int_of_string (q#param "version")) with Not_found -> None in
193 let rec loop page' i =
194 if i > max_redirect then (
195 error ~title:"Too many redirections" ~back_button:true
196 q ("Too many redirects between pages. This may happen because " ^
197 "of a cycle of redirections.");
200 match fetch_page page' version allow_redirect with
201 | FPOK (pageid, title, description, last_modified_date, has_page_css)->
202 make_page title description pageid last_modified_date has_page_css
204 | FPRedirect page' ->