Pre-select theme css in backend

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/Travelynx.pm b/lib/Travelynx.pm
index c4a2b53..2c15154 100755
--- a/lib/Travelynx.pm
+++ b/lib/Travelynx.pm
@@ -93,6 +93,23 @@ sub startup {
 
 	$self->defaults( layout => 'default' );
 
+	$self->hook(
+		before_dispatch => sub {
+			my ($self) = @_;
+
+          # The "theme" cookie is set client-side if the theme we delivered was
+          # changed by dark mode detection or by using the theme switcher). It's
+          # not part of Mojolicious' session data (and can't be, due to
+          # signing and HTTPOnly), so we need to add it here.
+			for my $cookie ( @{ $self->req->cookies } ) {
+				if ( $cookie->name eq 'theme' ) {
+					$self->session( theme => $cookie->value );
+					return;
+				}
+			}
+		}
+	);
+
 	$self->attr(
 		cache_iris_main => sub {
 			my ($self) = @_;