metadata-ttl.patch

--- a/usr/share/perl5/Lemonldap/NG/Portal/Issuer/OpenIDConnect.pm
+++ b/usr/share/perl5/Lemonldap/NG/Portal/Issuer/OpenIDConnect.pm
@@ -2704,8 +2704,13 @@ sub logout {
 sub metadata {
     my ( $self, $req ) = @_;
     $req->data->{dropCsp} = 1 if $self->conf->{oidcDropCspHeaders};
+    my %args;
+    if ( $self->conf->{oidcServiceMetadataTtl} ) {
+        $args{ttl}  = $self->conf->{oidcServiceMetadataTtl};
+        $args{date} = $self->conf->{cfgDate};
+    }
     return $self->p->sendJSONresponse( $req,
-        $self->metadataDoc( $self->get_issuer($req) ) );
+        $self->metadataDoc( $self->get_issuer($req) ), %args );
 }
 
 # Store request parameters in %ENV
--- a/usr/share/perl5/Lemonldap/NG/Portal/Main/Run.pm
+++ b/usr/share/perl5/Lemonldap/NG/Portal/Main/Run.pm
@@ -1444,6 +1444,10 @@ sub sendJSONresponse {
     # Handle caching
     if ( $args{ttl} and $args{ttl} =~ /^\d+$/ ) {
         push @{ $res->[1] }, 'Cache-Control' => 'public, max-age=' . $args{ttl};
+        push @{ $res->[1] },
+          'Last-Modified' =>
+          POSIX::strftime( "%a, %0e %b %Y %H:%M:%S GMT", gmtime($args{date}) )
+          if $args{date};
     }
     else {
         push @{ $res->[1] },