+sub legacy_redirects {
+ my ($ctx, $path_info) = @_;
+
+ # single-message pages
+ if ($path_info =~ m!$LISTNAME_RE/m/(\S+)/\z!o) {
+ r301($ctx, $1, $2);
+ } elsif ($path_info =~ m!$LISTNAME_RE/m/(\S+)/raw\z!o) {
+ r301($ctx, $1, $2, 'raw');
+
+ } elsif ($path_info =~ m!$LISTNAME_RE/f/(\S+)/\z!o) {
+ r301($ctx, $1, $2, 'f/');
+
+ # thread display
+ } elsif ($path_info =~ m!$LISTNAME_RE/t/(\S+)/\z!o) {
+ r301($ctx, $1, $2, 't/#u');
+
+ } elsif ($path_info =~ m!$LISTNAME_RE/t/(\S+)/mbox(\.gz)?\z!o) {
+ r301($ctx, $1, $2, "t.mbox$3");
+
+ # even older legacy redirects
+ } elsif ($path_info =~ m!$LISTNAME_RE/m/(\S+)\.html\z!o) {
+ r301($ctx, $1, $2);
+
+ } elsif ($path_info =~ m!$LISTNAME_RE/t/(\S+)\.html\z!o) {
+ r301($ctx, $1, $2, 't/#u');
+
+ } elsif ($path_info =~ m!$LISTNAME_RE/f/(\S+)\.html\z!o) {
+ r301($ctx, $1, $2, 'f/');
+
+ } elsif ($path_info =~ m!$LISTNAME_RE/(?:m|f)/(\S+)\.txt\z!o) {
+ r301($ctx, $1, $2, 'raw');
+
+ } elsif ($path_info =~ m!$LISTNAME_RE/t/(\S+)(\.mbox(?:\.gz)?)\z!o) {
+ r301($ctx, $1, $2, "t$3");
+
+ # legacy convenience redirects, order still matters
+ } elsif ($path_info =~ m!$LISTNAME_RE/m/(\S+)\z!o) {
+ r301($ctx, $1, $2);
+ } elsif ($path_info =~ m!$LISTNAME_RE/t/(\S+)\z!o) {
+ r301($ctx, $1, $2, 't/#u');
+ } elsif ($path_info =~ m!$LISTNAME_RE/f/(\S+)\z!o) {
+ r301($ctx, $1, $2, 'f/');
+
+ } else {
+ r404();
+ }
+}
+
+sub r301 {
+ my ($ctx, $listname, $mid, $suffix) = @_;
+ my $cgi = $ctx->{cgi};
+ my $url;
+ if (ref($cgi) eq 'CGI') {
+ $url = $cgi->url(-base) . '/';
+ } else {
+ $url = $cgi->base->as_string;
+ }
+
+ $url .= $listname . '/';
+ $url .= (uri_escape_utf8($mid) . '/') if (defined $mid);
+ $url .= $suffix if (defined $suffix);
+
+ [ 301,
+ [ Location => $url, 'Content-Type' => 'text/plain' ],
+ [ "Redirecting to $url\n" ] ]
+}
+