Add filter on post/etc action links in the REST API

[rmccue]

With Gutenberg increasingly using more action links to control behaviour in the block editor, having a filter to adjust these links would be super useful. This allows developers to avoid a shotgun approach of hacking Gutenberg's UI, or using the very low-level filters to remove these actions.

This is probably useful to have as a general API to also add additional actions; e.g. for implementing something similar to Gutenberg's actions.

[TimothyBlynJacobs]

This makes sense to me. We'd probably also want a filter on get_schema_links.

[patopaiar]

@TimothyBlynJacobs I would like to contribute with this ticket, but I am not 100% sure of which links exactly would be the ones that need a filter added.

For your comment it is clearer, in get_schema_links function line 2452, instead of

$schema_links = $this->get_schema_links();

We can do

$schema_links = apply_filters( "rest_{$this->post_type}_item_schema_links" , $this->get_schema_links() );

But for the action links, how can I figure out which ones to add filters to?