(* COCANWIKI scripts. * Written by Richard W.M. Jones . * Copyright (C) 2004 Merjis Ltd. * $Id: page.ml,v 1.4 2004/09/07 16:19:43 rich Exp $ *) open Apache open Registry open Cgi open Printf open ExtString open Cocanwiki open Cocanwiki_template open Cocanwiki_ok open Cocanwiki_date let template_page = get_template "page.html" let template_404 = get_template "page_404.html" (* Maximum level of redirection. *) let max_redirect = 4 type fp_status = FPOK of int * string * string * Dbi.datetime * bool | FPRedirect of string | FPNotFound let run r (q : cgi) (dbh : Dbi.connection) (hostid, _, _) user = let page = q#param "page" in let page = if page = "" then "index" else page in (* Host-specific CSS? *) let sth = dbh#prepare_cached "select css is not null from hosts where id = ?" in sth#execute [`Int hostid]; let has_host_css = match sth#fetch1 () with | [ `Bool has_host_css ] -> has_host_css | _ -> assert false in (* This code generates ordinary pages. *) let make_page title description pageid last_modified_date has_page_css version page page' = let t = template_page in t#set "title" title; t#set "description" description; t#set "pageid" (string_of_int pageid); t#set "last_modified_date" (printable_date last_modified_date); t#set "cocanwiki_package" Cocanwiki_version.package; t#set "cocanwiki_version" Cocanwiki_version.version; if page <> page' then (* redirection *) ( t#set "page" page'; t#set "original_page" page; (* XXX title - get it from database *) t#conditional "redirected" true ) else ( t#set "page" page; t#conditional "redirected" false ); t#conditional "has_host_css" has_host_css; t#conditional "has_page_css" has_page_css; (* Pull out the sections in this page. *) let sth = dbh#prepare_cached "select ordering, sectionname, content, divname from contents where pageid = ? order by ordering" in sth#execute [`Int pageid]; let sections = sth#map (function [`Int ordering; `String sectionname; `String content; (`Null | `String _) as divname] -> let divname, has_divname = match divname with `Null -> "", false | `String divname -> divname, true in [ "ordering", Template.VarString (string_of_int ordering); "sectionname", Template.VarString sectionname; "content", Template.VarString (Wikilib.xhtml_of_content dbh hostid content); "has_divname", Template.VarConditional has_divname; "divname", Template.VarString divname ] | _ -> assert false) in t#table "sections" sections; (* Are we showing an old version of the page? If so, warn. *) (match version with None -> t#conditional "is_old_version" false | Some pageid -> t#conditional "is_old_version" true; t#set "old_version" (string_of_int pageid)); (* Login status. *) (match user with Anonymous -> t#conditional "user_logged_in" false | User (_, username, _) -> t#conditional "user_logged_in" true; t#set "username" username); q#template t in (* This code generates 404 pages. *) let make_404 () = Request.set_status r 404; (* Return a 404 error code. *) let t = template_404 in t#set "page" page; let search_terms = String.map (function ('a'..'z' | 'A'..'Z' | '0'..'9') as c -> c | _ -> ' ') page in template_404#set "search_terms" search_terms; q#template t in (* Fetch a page by name. This function can give three answers: * (1) Page fetched OK (fetches some details of the page). * (2) Page is a redirect (fetches the name of the redirect page). * (3) Page not found in database, ie. 404 error. *) (* XXX Should do a case-insensitive matching of URLs, and if the URL differs * in case only should redirect to the lowercase version. *) let fetch_page page version allow_redirect = match version with | None -> if allow_redirect then ( let sth = dbh#prepare_cached "select redirect, id, title, description, last_modified_date, css is not null from pages where hostid = ? and url = ?" in sth#execute [`Int hostid; `String page]; (try (match sth#fetch1 () with | [ `Null; `Int id; `String title; `String description; `Timestamp last_modified_date; `Bool has_page_css ] -> FPOK (id, title, description, last_modified_date, has_page_css) | `String redirect :: _ -> FPRedirect redirect | _ -> assert false) with Not_found -> FPNotFound) ) else (* redirects not allowed ... *) ( let sth = dbh#prepare_cached "select id, title, description, last_modified_date, css is not null from pages where hostid = ? and url = ?" in sth#execute [`Int hostid; `String page]; (try (match sth#fetch1 () with | [ `Int id; `String title; `String description; `Timestamp last_modified_date; `Bool has_page_css ] -> FPOK (id, title, description, last_modified_date, has_page_css) | _ -> assert false) with Not_found -> FPNotFound) ) | Some version -> let sth = dbh#prepare_cached "select id, title, description, last_modified_date, css is not null from pages where hostid = ? and id = ? and (url = ? or url_deleted = ?)" in sth#execute [`Int hostid; `Int version; `String page; `String page]; (try (match sth#fetch1 () with | [ `Int id; `String title; `String description; `Timestamp last_modified_date; `Bool has_page_css ] -> FPOK (id, title, description, last_modified_date, has_page_css) | _ -> assert false) with Not_found -> FPNotFound) in (* Here we deal with the complex business of redirects and versions. *) let allow_redirect = not (q#param_true "no_redirect") in let version = try Some (int_of_string (q#param "version")) with Not_found -> None in let rec loop page' i = if i > max_redirect then ( error ~title:"Too many redirections" ~back_button:true q ("Too many redirects between pages. This may happen because " ^ "of a cycle of redirections."); raise CgiExit ) else match fetch_page page' version allow_redirect with | FPOK (pageid, title, description, last_modified_date, has_page_css)-> make_page title description pageid last_modified_date has_page_css version page page' | FPRedirect page' -> loop page' (i+1) | FPNotFound -> make_404 () in loop page 0 let () = register_script run