blocks.php

<?php
namespace SAFCA\SAFCA\Blocks;

/**
 * Set up theme defaults and register supported WordPress features.
 *
 * @since 0.1.0
 *
 * @uses add_action()
 *
 * @return void
 */
function setup() {
	$n = function( $function ) {
		return __NAMESPACE__ . "\\$function";
	};
	add_filter( 'allowed_block_types', $n( 'allowed_block_types' ) );
/* 	add_action( 'init', $n( 'about_blocks_template' ) ); */
/* add_action( 'wp_footer', $n( 'display_post_blocks' ) ); */
}

function allowed_block_types( $allowed_blocks ) {
	return array(
		'core/paragraph',
		'core/image',
		'core/heading',
		'core/list',
		'core/file',
		'core/video',
		'core/freeform',
		'core/html',
		'core/pullquote',
		'core/button',
		'core/columns',
		'core/media-text',
		'core/more',
		'core/separator',
		'core/spacer',
		'core/shortcode',
		'core/embed',
		'core-embed/youtube',
		'core/embed/vimeo',
		'acf/accordion',
		'acf/photo-video-gallery',
		'acf/suggested-content',
		'acf/related-projects',
		'acf/related-news',
		'acf/related-resources',
		'acf/about-hero',
		'gravityforms/block',
		'gravityforms/form'
	);
}

function about_blocks_template() {
	$post_id = $_GET['post'];
	if( 'templates/about.php' !== get_page_template_slug( $post_id ) ) {
		return false;
	}
	$page_type_object = get_post_type_object( 'page' );
	$post_type_object->template = array(
		array( 'core/paragraph', array(
            'placeholder' => 'Add Description...',
        ) ),
        array( 'core/heading', array(
            'placeholder' => 'Add Description...',
        ) ),
    );
    $post_type_object->template_lock = 'all';
}

function display_post_blocks() {
	global $post;
	wp_send_json( esc_html( $post->post_content ) );
}