1<?php
2/**
3 * Post Meta source for the block bindings.
4 *
5 * @since 6.5.0
6 * @package WordPress
7 * @subpackage Block Bindings
8 */
9
10/**
11 * Gets value for Post Meta source.
12 *
13 * @since 6.5.0
14 * @access private
15 *
16 * @param array $source_args Array containing source arguments used to look up the override value.
17 * Example: array( "key" => "foo" ).
18 * @param WP_Block $block_instance The block instance.
19 * @return mixed The value computed for the source.
20 */
21function _block_bindings_post_meta_get_value( array $source_args, $block_instance ) {
22 if ( empty( $source_args['key'] ) ) {
23 return null;
24 }
25
26 if ( empty( $block_instance->context['postId'] ) ) {
27 return null;
28 }
29 $post_id = $block_instance->context['postId'];
30
31 // If a post isn't public, we need to prevent unauthorized users from accessing the post meta.
32 $post = get_post( $post_id );
33 if ( ( ! is_post_publicly_viewable( $post ) && ! current_user_can( 'read_post', $post_id ) ) || post_password_required( $post ) ) {
34 return null;
35 }
36
37 // Check if the meta field is protected.
38 if ( is_protected_meta( $source_args['key'], 'post' ) ) {
39 return null;
40 }
41
42 // Check if the meta field is registered to be shown in REST.
43 $meta_keys = get_registered_meta_keys( 'post', $block_instance->context['postType'] );
44 // Add fields registered for all subtypes.
45 $meta_keys = array_merge( $meta_keys, get_registered_meta_keys( 'post', '' ) );
46 if ( empty( $meta_keys[ $source_args['key'] ]['show_in_rest'] ) ) {
47 return null;
48 }
49
50 return get_post_meta( $post_id, $source_args['key'], true );
51}
52
53/**
54 * Registers Post Meta source in the block bindings registry.
55 *
56 * @since 6.5.0
57 * @access private
58 */
59function _register_block_bindings_post_meta_source() {
60 register_block_bindings_source(
61 'core/post-meta',
62 array(
63 'label' => _x( 'Post Meta', 'block bindings source' ),
64 'get_value_callback' => '_block_bindings_post_meta_get_value',
65 'uses_context' => array( 'postId', 'postType' ),
66 )
67 );
68}
69
70add_action( 'init', '_register_block_bindings_post_meta_source' );
71