Question about Embed SRC formation

Hi all,

I've recently been working on some code additions to hypothes.is which would allow users to embed H5P activities in the annotation pane. The way I'm doing this currently is writing a javascript function which will detect (based on the URL for a published H5P activity) whether or not a link is an H5P activity and then outputting an iFrame. While I can write an indexOf call that will detect the pattern used for H5P activities on my particular WP installation, I don't know how H5P activities are published in other contexts and was wondering if someone could explain for me how H5P activities are published and the rules around URL production in all possible situations. For example, H5P activities published via the WordPress plugin seem to have "admin-ajax.php?action=h5p_embed&id=#" in their iframe src string, and the H5P activities you have embedded on this site seem to have "h5p/embed/#" in their src string. Is there a specific, recognizable pattern for H5P activities published via Drupal, or in Moodle, or elsewhere? Sorry if any of this is confusing--I'd be happy to schedule a quick call and do some screensharing if a demonstration/explanation would be more helpful.