-# cgi_goto(CGI, [page])
-# Redirect to a specified page, or display "not found". If not specified,
-# the page param from the CGI object is used.
-sub cgi_goto ($;$) {
- my $q = shift;
- my $page = shift;
-
- if (!defined $page) {
- $page = decode_utf8($q->param("page"));
-
- if (!defined $page) {
- error("missing page parameter");
- }
- }
-
- loadindex();
-
- # If the page is internal (like a comment), see if it has a
- # permalink. Comments do.
- if (isinternal($page) &&
- defined $pagestate{$page}{meta}{permalink}) {
- redirect($q, $pagestate{$page}{meta}{permalink});
- }
-
- my $link = bestlink("", $page);
-
- if (! length $link) {
- print $q->header(-status => "404 Not Found");
- print misctemplate(gettext("missing page"),
- "<p>".
- sprintf(gettext("The page %s does not exist."),
- htmllink("", "", $page)).
- "</p>".
- # Internet Explorer won't show custom 404 responses
- # unless they're >= 512 bytes
- (" " x 512));
- }
- else {
- redirect($q, urlto($link, undef, 1));
- }
-
- exit;
-}
-
-sub cgi_page_from_404 ($$$) {
- my $path = shift;
- my $baseurl = shift;
- my $usedirs = shift;
-
- # fail if missing from environment or whatever
- return undef unless defined $path;
- return undef unless defined $baseurl;
-
- # with usedirs on, path is like /~fred/foo/bar/ or /~fred/foo/bar or
- # /~fred/foo/bar/index.html
- # with usedirs off, path is like /~fred/foo/bar.html
- # baseurl is like 'http://people.example.com/~fred'
-
- # convert baseurl to ~fred
- unless ($baseurl =~ s{^https?://[^/]+/?}{}) {
- return undef;
- }
-
- # convert path to /~fred/foo/bar
- if ($usedirs) {
- $path =~ s/\/*(?:index\.$config{htmlext})?$//;
- }
- else {
- $path =~ s/\.$config{htmlext}$//;
- }
-
- # remove /~fred/
- unless ($path =~ s{^/*\Q$baseurl\E/*}{}) {
- return undef;
- }
-
- # special case for the index
- unless ($path) {
- return 'index';
- }
-
- return $path;
-}
-