Add option to disable local auth

src/lib/Hydra/Controller/User.pm

@@ -25,6 +25,8 @@ sub login :Local :Args(0) :ActionClass('REST') { }
 sub login_POST {
     my ($self, $c) = @_;
 
+    badRequest($c, "Local authentication is disabled.") if $c->config->{disable_local_auth};
+
     my $username = $c->stash->{params}->{username} // "";
     my $password = $c->stash->{params}->{password} // "";
 

src/root/topbar.tt

@@ -146,7 +146,9 @@
         <a class="dropdown-item" href="/github-redirect?after=[% c.req.path | uri %]">Sign in with GitHub</a>
         <div class="dropdown-divider"></div>
       [% END %]
-      <a class="dropdown-item" href="#hydra-signin" data-toggle="modal">Sign in with a Hydra account</a>
+      [% UNLESS c.config.disable_local_auth %]
+        <a class="dropdown-item" href="#hydra-signin" data-toggle="modal">Sign in with a Hydra account</a>
+      [% END %]
     [% END %]
   [% END %]