CGI: add cgi_page_from_404(), which remaps a path like $REDIRECT_URL to an IkiWiki...

[www/ikiwiki.git] / IkiWiki / CGI.pm

diff --git a/IkiWiki/CGI.pm b/IkiWiki/CGI.pm
index fe845726229137b8c623cb8fda86100785d82d07..82cad40c80ad92961fb88e1717f9d0f06049af9e 100644 (file)
--- a/IkiWiki/CGI.pm
+++ b/IkiWiki/CGI.pm
@@ -332,6 +332,46 @@ sub cgi_goto ($;$) {
        exit;
 }
 
+sub cgi_page_from_404 ($$$) {
+       my $path = shift;
+       my $baseurl = shift;
+       my $usedirs = shift;
+
+       # fail if missing from environment or whatever
+       return undef unless defined $path;
+       return undef unless defined $baseurl;
+
+       # with usedirs on, path is like /~fred/foo/bar/ or /~fred/foo/bar or
+       #    /~fred/foo/bar/index.html
+       # with usedirs off, path is like /~fred/foo/bar.html
+       # baseurl is like 'http://people.example.com/~fred'
+
+       # convert baseurl to ~fred
+       unless ($baseurl =~ s{^https?://[^/]+/?}{}) {
+               return undef;
+       }
+
+       # convert path to /~fred/foo/bar
+       if ($usedirs) {
+               $path =~ s/\/*(?:index\.$config{htmlext})?$//;
+       }
+       else {
+               $path =~ s/\.$config{htmlext}$//;
+       }
+
+       # remove /~fred/
+       unless ($path =~ s{^/*\Q$baseurl\E/*}{}) {
+               return undef;
+       }
+
+       # special case for the index
+       unless ($path) {
+               return 'index';
+       }
+
+       return $path;
+}
+
 sub cgi (;$$) {
        my $q=shift;
        my $session=shift;