- let redirect = if model.redirect = "" then `Null
- else `String model.redirect in
-
- (* Create the new page. *)
- let sth = dbh#prepare_cached "insert into pages (hostid, url, title,
- description, creation_date, logged_ip,
- logged_user, redirect, css)
- values (?, ?, ?, ?, ?, ?, ?, ?, ?)" in
- sth#execute [`Int hostid; `String url; `String title;
- `String model.description; creation_date; logged_ip;
- logged_user; redirect; css];
-
- (* New page ID <> old page ID model.id. *)
- let pageid = sth#serial "pages_id_seq" in
-
- (* Create the page contents. *)
- let sth = dbh#prepare_cached "insert into contents (pageid,
- ordering, sectionname, divname, content)
- values (?, ?, ?, ?, ?)" in
- let ordering = ref 0 in (* Creating new ordering. *)
- List.iter (fun (sectionname, divname, content) ->
- let divname =
- if string_is_whitespace divname then `Null
- else `String divname in
- let sectionname =
- if string_is_whitespace sectionname then `Null
- else `String sectionname in
- incr ordering; let ordering = !ordering in
- sth#execute [`Int pageid; `Int ordering;
- sectionname; divname;
- `String content])
- model.contents;
+ let redirect =
+ if model.redirect = "" then `Null
+ else `String model.redirect in
+
+ let url, pageid =
+ (* Creating a new page (id = 0)? If so, we're just going to insert
+ * a new row, which is easy.
+ *)
+ if model.id = 0 then (
+ (* Create the page title or URL. *)
+ let url, title =
+ match model.pt with
+ Page url -> url, url
+ | Title title ->
+ match Wikilib.generate_url_of_title dbh hostid title with
+ Wikilib.GenURL_OK url -> url, title
+ | Wikilib.GenURL_Duplicate url ->
+ error ~back_button:true ~title:"Page exists"
+ q ("While you were editing that page, it looks " ^
+ "like another user created the same page.");
+ return ()
+ | _ ->
+ assert false (* This should have been detected in
+ * begin_editing_new.
+ *) in
+
+ let sth = dbh#prepare_cached "insert into pages (hostid, url, title,
+ description, logged_ip, logged_user,
+ redirect)
+ values (?, ?, ?, ?, ?, ?, ?)" in
+ sth#execute [`Int hostid; `String url; `String title;
+ `String model.description; logged_ip; logged_user;
+ redirect];
+
+ let pageid = sth#serial "pages_id_seq" in
+
+ (* Create the page contents. *)
+ let sth = dbh#prepare_cached "insert into contents (pageid,
+ ordering, sectionname, divname,
+ content)
+ values (?, ?, ?, ?, ?)" in
+ let ordering = ref 0 in (* Creating new ordering. *)
+ List.iter (fun (sectionname, divname, content) ->
+ let divname =
+ if string_is_whitespace divname then `Null
+ else `String divname in
+ let sectionname =
+ if string_is_whitespace sectionname then `Null
+ else `String sectionname in
+ incr ordering; let ordering = !ordering in
+ sth#execute [`Int pageid; `Int ordering;
+ sectionname; divname;
+ `String content])
+ model.contents;
+
+ url, pageid
+ )
+ (* Otherwise it's an old page which we're updating. *)
+ else (
+ (* Pull out fields from the database. *)
+ let sth = dbh#prepare_cached "select creation_date,
+ coalesce (url, url_deleted),
+ title, css
+ from pages
+ where hostid = ? and id = ?" in
+ sth#execute [`Int hostid; `Int model.id];
+
+ let creation_date, url, title, css =
+ match sth#fetch1 () with
+ [ creation_date; `String url; `String title; css ] ->
+ creation_date, url, title, css
+ | _ -> assert false in
+
+ (* Has someone else edited this page in the meantime? *)
+ let sth = dbh#prepare_cached "select max(id) from pages
+ where hostid = ? and url = ?" in
+ sth#execute [`Int hostid; `String url];
+
+ let max_id = sth#fetch1int () in
+ let edited = max_id <> model.id in
+
+ if edited then (
+ (* Edited by someone else ... Get the other's changes. *)
+ let other_diff, _ =
+ get_diff dbh hostid url
+ ~old_version:model.id ~version:max_id () in
+
+ (* Synthesize our own changes. *)
+ let old_page = get_version_for_diff dbh model.id in
+ let new_page =
+ let css = match css with
+ `Null -> "" | `String css -> css
+ | _ -> assert false in
+ page_for_diff css (List.map (fun (sectionname, _, content) ->
+ sectionname, content) model.contents) in
+ let our_diff = diff_cmd old_page new_page in
+
+ (* Fill out the conflict template. *)
+ template_conflict#set "other_diff" other_diff;
+ template_conflict#set "our_diff" our_diff;
+ template_conflict#set "old_version" (string_of_int model.id);
+ template_conflict#set "new_version" (string_of_int max_id);
+ template_conflict#set "url" url;
+
+ q#template template_conflict;
+ return ()
+ );
+
+ (* Defer the pages_redirect_cn constraint because that would
+ * temporarily fail on the next UPDATE.
+ *)
+ let sth =
+ dbh#prepare_cached
+ "set constraints pages_redirect_cn, sitemenu_url_cn,
+ page_emails_url_cn, links_from_cn deferred" in
+ sth#execute [];
+
+ (* Mark the old page as deleted. NB. There is a small race
+ * condition here because PostgreSQL doesn't do isolation
+ * properly. If a user tries to visit this page between the
+ * delete and the creation of the new page, then they'll get
+ * a page not found error. (XXX)
+ *)
+ let sth = dbh#prepare_cached "update pages set url_deleted = url,
+ url = null
+ where hostid = ? and id = ?" in
+ sth#execute [`Int hostid; `Int model.id];
+
+ (* Create the new page. *)
+ let sth = dbh#prepare_cached "insert into pages (hostid, url, title,
+ description, creation_date, logged_ip,
+ logged_user, redirect, css)
+ values (?, ?, ?, ?, ?, ?, ?, ?, ?)" in
+ sth#execute [`Int hostid; `String url; `String title;
+ `String model.description; creation_date; logged_ip;
+ logged_user; redirect; css];
+
+ (* New page ID <> old page ID model.id. *)
+ let pageid = sth#serial "pages_id_seq" in
+
+ (* Create the page contents. *)
+ let sth = dbh#prepare_cached "insert into contents (pageid,
+ ordering, sectionname, divname,
+ content)
+ values (?, ?, ?, ?, ?)" in
+ let ordering = ref 0 in (* Creating new ordering. *)
+ List.iter (fun (sectionname, divname, content) ->
+ let divname =
+ if string_is_whitespace divname then `Null
+ else `String divname in
+ let sectionname =
+ if string_is_whitespace sectionname then `Null
+ else `String sectionname in
+ incr ordering; let ordering = !ordering in
+ sth#execute [`Int pageid; `Int ordering;
+ sectionname; divname;
+ `String content])
+ model.contents;
+
+ (* General email notification of page edits. Send an email to
+ * anyone in the page_emails table who has a confirmed address
+ * and who hasn't received an email already today.
+ *)
+ let sth = dbh#prepare_cached "select email, opt_out from page_emails
+ where hostid = ? and url = ?
+ and pending is null
+ and last_sent < current_date" in
+ sth#execute [`Int hostid; `String url];
+
+ let addrs = sth#map (function [`String email; `String opt_out] ->
+ email, opt_out
+ | _ -> assert false) in
+
+ if addrs <> [] then (
+ (* Construct the email. *)
+ template_email#set "hostname" hostname;
+ template_email#set "page" url;
+
+ let subject =
+ "Site notice: " ^ hostname ^ "/" ^ url ^ " has been updated" in
+
+ (* Send each email individually (they all have different opt out
+ * links).
+ *)
+ List.iter (fun (to_addr, opt_out) ->
+ template_email#set "opt_out" opt_out;
+ let body = template_email#to_string in
+ Sendmail.send_mail ~subject
+ ~to_addr:[to_addr] ~body ())
+ addrs
+ );
+
+ (* Update the database to record when these emails were sent. *)
+ let sth = dbh#prepare_cached "update page_emails
+ set last_sent = current_date
+ where hostid = ? and url = ?
+ and pending is null" in
+ sth#execute [`Int hostid; `String url];
+
+ url, pageid
+ ) in