user_has_cap difference in Classic and Block Editors

gistfile1.txt

<?php
/*
Plugin Name: Block Editor vs Classic user_has_cap proof of concept
Description: This plugin compares the user_has_cap filter functionality in the Classic and Block editors. It intends to allow Authors the ability to edit pages they are the author of.
Version:     1
Author:      Jason LeMahieu
Author URI:  https://jasonlemahieu.com
 */

/* When used in the Classic Editor, Authors can edit pages they are the author of.
   When used in the Block Editor, Authors can only "Submit for Review". they can not edit / save their changes */


add_filter( 'user_has_cap', 'ext_block_vs_classic_filters_test', 10, 3 );


/**
 * 
 *
 * @param array $allcaps All the capabilities of the user
 * @param array $cap     [0] Required capability
 * @param array $args    [0] Requested capability
 *                       [1] User ID
 *                       [2] Associated object ID
 **/
function ext_block_vs_classic_filters_test( $allcaps, $cap, $args ) {


	// allow authors to edit their own Pages
	switch ( $args[0] ) {

		case 'edit_post':
			$post_author_id = get_post_field( 'post_author', $args[2] );
			$current_user_id = get_current_user_id();

			if ( $post_author_id == $current_user_id ) {
				$allcaps[$cap[0]] = true;
			}

		break;

		case 'edit_pages':

			// args 2 is the associated object ID
			if ( isset( $args[2] ) && $args[2] ) {
				
				
				$post_author_id = get_post_field( 'post_author', $args[2] );
				$current_user_id = get_current_user_id();

				// asking about a specific page, so grant edit access if they arer an author of it
				if ( $post_author_id == $current_user_id ) {
					$allcaps[$cap[0]] = true;

					$allcaps['edit_published_pages'] = true;
					$allcaps['edit_published_posts'] = true;
					$allcaps['edit_others_posts'] = true;
				}	

			} else {
				// they've asked about the idea in general. say yes but it doesn't necessarily let them edit ALL pages. If they can edit Posts in the abstract, they can edit pages in the abstract
				if ( isset( $allcaps['edit_posts'] ) && $allcaps['edit_posts'] ) {
					$allcaps[$cap[0]] = true;
				}
			}

			break;

		case 'edit_published_pages':
			$allcaps[$cap[0]] = true;
			break;

		// For assistance in debugging
		case 'view_query_monitor':
			if ( is_user_logged_in() ) {
				$allcaps[$cap[0]] = true;
			}
			break;
	};

	return $allcaps;

}