Vaadin modify IndexHtmlResponse to set meta tags

In order to improve SEO of my Vaadin application I'd like to set up custom meta tags.

For this purpose I'd like to use IndexHtmlRequestListener:

serviceInitEvent.addIndexHtmlRequestListener(new IndexHtmlRequestListener() {

            @Override
            public void modifyIndexHtmlResponse(IndexHtmlResponse indexHtmlResponse) {

                Optional<UI> optionalUI = indexHtmlResponse.getUI();

                if (optionalUI.isPresent()) {
                    UI ui = optionalUI.get();
                    Document document = indexHtmlResponse.getDocument();

                    String title = ui.getInternals().getTitle();
                    if(StringUtils.isNoneBlank(title)) {
                        setMetaTag(document, "og:title", title);
                    }

                    setMetaTag(document, "description", ...
                    setMetaTag(document, "og:image", ...
                }
            }

        });

}

As you may see, right now I'm able to get the title provided in the every single view via HasDynamicTitle interface. I'd like to follow the same schema for the rest of meta tags. Simply speaking - I want to define such set of tags in the every view and then be able to retrieve somehow such tags in modifyIndexHtmlResponse method and set up these values to the document meta tags.

Please advice how to access the current View instance from the modifyIndexHtmlResponse method.

Assuming you have a fully initialized UI instance, you can find the current view (along with any wrapping router layouts) from the list in ui.getInternals().getActiveRouterTargetsChain().