(* COCANWIKI - a wiki written in Objective CAML. * Written by Richard W.M. Jones . * Copyright (C) 2004 Merjis Ltd. * $Id: page.ml,v 1.45 2006/03/28 16:24:07 rich Exp $ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; see the file COPYING. If not, write to * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. *) open Apache open Registry open Cgi open Printf open ExtString open ExtList open Cocanwiki open Cocanwiki_template open Cocanwiki_ok open Cocanwiki_date open Cocanwiki_server_settings open Cocanwiki_links type fp_status = FPOK of int32 * string * string * Calendar.t * bool | FPInternalRedirect of string | FPExternalRedirect of string | FPNotFound (* Referer strings which help us decide if the user came from * a search engine and highlight terms in the page appropriately. *) let search_engines = [ Pcre.regexp "^http://.*google\\.", [ "q"; "as_q"; "as_epq"; "as_oq" ]; Pcre.regexp "^http://.*yahoo\\.", [ "p" ]; Pcre.regexp "^http://.*msn\\.", [ "q"; "MT" ] ] let split_words = Pcre.regexp "\\W+" let split_qs_re = Pcre.regexp "\\?" let xhtml_re = Pcre.regexp "<.*?>|[^<>]+" let run r (q : cgi) dbh hostid ({ edit_anon = edit_anon; view_anon = view_anon } as host) user = let page = q#param "page" in let page = if page = "" then "index" else page in (* The main "page" template is split in two to improve the speed of * delivery of the page. The very first part ("page_header.html") * contains the page , crucially including all the links to the * stylesheets. We send this first and flush it out to the client so * that the client can begin requesting stylesheets, background images * and so on. After this we compose the main page ("page.html") and * send it out second. *) let template_page_header = get_template ~page dbh hostid "page_header.html" in let template_page = get_template ~page dbh hostid "page.html" in (* This is the simpler template for 404 pages. *) let template_404 = get_template dbh hostid "page_404.html" in (* Host-specific fields. *) let rows = PGSQL(dbh) "select css is not null, feedback_email is not null, mailing_list, navigation from hosts where id = $hostid" in let has_host_css, has_feedback_email, mailing_list, navigation = match rows with | [Some has_host_css, Some has_feedback_email, mailing_list, navigation] -> has_host_css, has_feedback_email, mailing_list, navigation | _ -> assert false in (* User permissions. *) let can_edit = can_edit host user in let can_manage_users = can_manage_users host user in (* Do we have a stats page set up? *) let has_stats = server_settings_stats_page dbh <> None in (* Given the referer string, return the list of search terms. If none * can be found, then throws Not_found. *) let search_terms_from_referer referer = let _, argnames = List.find (fun (rex, _) -> Pcre.pmatch ~rex referer) search_engines in let url, qs = match Pcre.split ~rex:split_qs_re ~max:2 referer with | [url] | [url;""] -> url, "" | [url;qs] -> url, qs | _ -> assert false in let args = Cgi_args.parse qs in let argname = List.find (fun argname -> List.mem_assoc argname args) argnames in let search_string = List.assoc argname args in Pcre.split ~rex:split_words search_string in (* Given a full page of XHTML, highlight search terms found in the * part of the page. *) let highlight_search_terms xhtml search_terms span_class = (* Split the original XHTML into strings and tags. For example if * the original string is: "This is some bold text.
", then * after this step we will have the following list: * [ "This is some "; ""; "bold"; ""; " text."; "
" ] *) let xhtml = Pcre.extract_all ~rex:xhtml_re xhtml in let xhtml = Array.to_list xhtml in let xhtml = List.map (fun matches -> matches.(0)) xhtml in (* Find the ... tags. We only want to apply * highlighting to tags within this area. *) let rec list_split f acc = function | [] -> List.rev acc, [] | ((x :: _) as xs) when f x -> List.rev acc, xs | x :: xs -> let acc = x :: acc in list_split f acc xs in let head, body = list_split (fun str -> String.starts_with str "") [] body in (* NB: Hopefully, xhtml = head @ body @ tail. *) (* The search terms are a list of simple words. Turn into a big * regular expression, because we want to substitute for each. We * end up with a regexp like '(word1|word2|word3)'. *) let rex = Pcre.regexp ~flags:[`CASELESS] ("(" ^ String.concat "|" search_terms ^ ")") in (* Do the substitution, but only on text, not elements! *) let body = let subst text = "" ^ text ^ "" in List.map (fun str -> if String.length str > 0 && str.[0] != '<' then Pcre.substitute ~rex ~subst str else str) body in (* Join the XHTML fragments back together again. *) String.concat "" (List.concat [ head ; body ; tail ]) in (* Check the templates table for extensions. *) let get_extension url = try let name = List.hd ( PGSQL(dbh) "select extension from templates where $url ~ url_regexp order by ordering limit 1" ) in Some (List.assoc name !extensions) with Not_found | ExtList.List.Empty_list -> None in (* This code generates ordinary pages. *) let make_page title description pageid last_modified_date has_page_css version page page' extension = let t = template_page in let th = template_page_header in t#set "title" title; th#set "title" title; t#set "last_modified_date" last_modified_date; (match description with None -> th#conditional "has_description" false | Some description -> th#conditional "has_description" true; th#set "description" description); if page <> page' then (* redirection *) ( t#set "page" page'; th#set "page" page'; t#set "original_page" page; (* XXX title - get it from database *) t#conditional "redirected" true ) else ( t#set "page" page; th#set "page" page; t#conditional "redirected" false ); th#conditional "has_host_css" has_host_css; th#conditional "has_page_css" has_page_css; (* Are we showing an old version of the page? If so, warn. *) (match version with None -> t#conditional "is_old_version" false; th#conditional "is_old_version" false | Some pageid -> t#conditional "is_old_version" true; th#conditional "is_old_version" true; t#set "old_version" (Int32.to_string pageid); th#set "old_version" (Int32.to_string pageid)); (* At this point, we can print out the header and flush it back to * the user, allowing the browser to start fetching stylesheets * and background images while we compose the page. *) q#header (); ignore (print_string r th#to_string); ignore (Request.rflush r); t#conditional "has_feedback_email" has_feedback_email; t#conditional "mailing_list" mailing_list; t#conditional "navigation" navigation; t#conditional "can_edit" can_edit; t#conditional "can_manage_users" can_manage_users; t#conditional "has_stats" has_stats; (* Pull out the sections in this page. *) let sections = match pageid with None -> [] | Some pageid -> let rows = PGSQL(dbh) "select ordering, sectionname, content, divname from contents where pageid = $pageid order by ordering" in List.map (fun (ordering, sectionname, content, divname) -> let divname, has_divname = match divname with | None -> "", false | Some divname -> divname, true in let sectionname, has_sectionname = match sectionname with | None -> "", false | Some sectionname -> sectionname, true in let linkname = linkname_of_sectionname sectionname in [ "ordering", Template.VarString (Int32.to_string ordering); "has_sectionname", Template.VarConditional has_sectionname; "sectionname", Template.VarString sectionname; "linkname", Template.VarString linkname; "content", Template.VarString (Wikilib.xhtml_of_content dbh hostid content); "has_divname", Template.VarConditional has_divname; "divname", Template.VarString divname ]) rows in (* Call an extension to generate the first section in this page? *) let sections = match extension with None -> sections | Some extension -> let content = extension dbh hostid page' in let section = [ "ordering", Template.VarString "0"; "has_sectionname", Template.VarConditional false; "linkname", Template.VarString ""; "content", Template.VarString content; "has_divname", Template.VarConditional true; "divname", Template.VarString "form_div"; ] in section :: sections in t#table "sections" sections; (* Login status. *) (match user with Anonymous -> t#conditional "user_logged_in" false | User (_, username, _, _) -> t#conditional "user_logged_in" true; t#set "username" username); (* If logged in, we want to update the recently_visited table. *) if pageid <> None then ( match user with | User (userid, _, _, _) -> PGSQL(dbh) "delete from recently_visited where hostid = $hostid and userid = $userid and url = $page'"; PGSQL(dbh) "insert into recently_visited (hostid, userid, url) values ($hostid, $userid, $page')"; PGOCaml.commit dbh; PGOCaml.begin_work dbh; | _ -> () ); (* Navigation links. *) if navigation then ( let max_links = 18 in (* Show no more links than this. *) (* What links here. *) let wlh = what_links_here dbh hostid page' in let wlh = List.take max_links wlh in let wlh_urls = List.map fst wlh in (* Just the URLs ... *) let rv = match user with | User (userid, _, _, _) -> (* Recently visited URLs, but don't repeat any from the 'what * links here' section, and don't link to self. *) let not_urls = page' :: wlh_urls in let limit = Int32.of_int (max_links - List.length wlh_urls) in let rows = PGSQL(dbh) "select rv.url, p.title, rv.visit_time from recently_visited rv, pages p where rv.hostid = $hostid and rv.userid = $userid and rv.url not in $@not_urls and rv.hostid = p.hostid and rv.url = p.url order by 3 desc limit $limit" in List.map ( fun (url, title, _) -> url, title ) rows | _ -> [] in (* Links to page. *) let f (page, title) = [ "page", Template.VarString page; "title", Template.VarString title ] in let table = List.map f wlh in t#table "what_links_here" table; t#conditional "has_what_links_here" (wlh <> []); let table = List.map f rv in t#table "recently_visited" table; t#conditional "has_recently_visited" (rv <> []); (* If both lists are empty (ie. an empty navigation box would * appear), then disable navigation altogether. *) if wlh = [] && rv = [] then t#conditional "navigation" false ); (* If we are coming from a search engine then we want to highlight * search terms throughout the whole page ... *) try let referer = Table.get (Request.headers_in r) "Referer" in let search_terms = search_terms_from_referer referer in (* Highlight the search terms. *) let xhtml = t#to_string in let xhtml = highlight_search_terms xhtml search_terms "search_term" in (* Deliver the page. *) ignore (print_string r xhtml) with Not_found -> (* No referer / no search terms / not a search engine referer. *) ignore (print_string r t#to_string) 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 t#set "search_terms" search_terms; t#conditional "can_edit" can_edit; t#conditional "can_manage_users" can_manage_users; t#conditional "has_stats" has_stats; 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, could be template or 404 error. *) let fetch_page page version allow_redirect = match version with | None -> if allow_redirect then ( let rows = PGSQL(dbh) "select url, redirect, id, title, description, last_modified_date, css is not null from pages where hostid = $hostid and lower (url) = lower ($page)" in match rows with | [Some page', _, _, _, _, _, _] when page <> page' -> (* different case *) FPExternalRedirect page' | [ _, None, id, title, description, last_modified_date, has_page_css ] -> let has_page_css = Option.get has_page_css in FPOK (id, title, description, last_modified_date, has_page_css) | [_, Some redirect, _, _, _, _, _] -> FPInternalRedirect redirect | [] -> FPNotFound | _ -> assert false ) else (* redirects not allowed ... *) ( let rows = PGSQL(dbh) "select id, title, description, last_modified_date, css is not null from pages where hostid = $hostid and url = $page" in match rows with | [ id, title, description, last_modified_date, has_page_css ] -> let has_page_css = Option.get has_page_css in FPOK (id, title, description, last_modified_date, has_page_css) | [] -> FPNotFound | _ -> assert false ) | Some version -> let rows = PGSQL(dbh) "select id, title, description, last_modified_date, css is not null from pages where hostid = $hostid and id = $version and (url = $page or url_deleted = $page)" in match rows with | [ id, title, description, last_modified_date, has_page_css ] -> let has_page_css = Option.get has_page_css in FPOK (id, title, description, last_modified_date, has_page_css) | [] -> FPNotFound | _ -> assert false in (* Here we deal with the complex business of redirects and versions. *) (* Only allow the no_redirect and version syntax for editors. *) let allow_redirect, version = if can_edit then ( not (q#param_true "no_redirect"), try Some (Int32.of_string (q#param "version")) with Not_found -> None ) else (true, None) in let rec loop page' i = if i > max_redirect then ( error ~title:"Too many redirections" ~back_button:true dbh hostid q ("Too many redirects between pages. This may happen because " ^ "of a cycle of redirections."); return () ) else match fetch_page page' version allow_redirect with | FPOK (pageid, title, description, last_modified_date, has_page_css)-> (* Check if the page is also a template. *) let extension = get_extension page' in make_page title (Some description) (Some pageid) (printable_date last_modified_date) has_page_css version page page' extension | FPInternalRedirect page' -> loop page' (i+1) | FPExternalRedirect page' -> (* This normally happens when a user has request an uppercase * page name. We redirect to the true (lowercase) version. *) q#redirect ("http://" ^ host.hostname ^ "/" ^ page'); return () | FPNotFound -> (* Might be a templated page with no content in it. *) let extension = get_extension page' in (match extension with | (Some _) as extension -> let title = page' in make_page title None None "Now" false None page page' extension | None -> make_404 ()) in loop page 0 let () = register_script ~restrict:[CanView] run