TT#20696 Fix contract_id validation in reseller

When creating or updating a reseller, catch non-numeric contract_id
and return 422, otherwise 500 would be returned.

Change-Id: I0e22f6f514fef80f5265eca28d7ec97811c1172f

lib/NGCP/Panel/Controller/API/Resellers.pm

@@ -163,6 +163,10 @@ sub POST :Allow {
 
         my $form = $self->get_form($c);
         $resource->{contract_id} //= undef;
+        if(defined $resource->{contract_id} && !is_int($resource->{contract_id})) {
+            $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Invalid 'contract_id', not a number");
+            return;
+        }
         last unless $self->validate_form(
             c => $c,
             resource => $resource,

lib/NGCP/Panel/Role/API/Resellers.pm

@@ -87,6 +87,11 @@ sub update_reseller {
 
     $form //= $self->get_form($c);
     $resource->{contract_id} //= undef;
+    if(defined $resource->{contract_id} && !is_int($resource->{contract_id})) {
+        $self->error($c, HTTP_UNPROCESSABLE_ENTITY, "Invalid 'contract_id', not a number");
+        return;
+    }
+
     return unless $self->validate_form(
         c => $c,
         form => $form,