<?php

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/**

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* Post Meta source for the block bindings.

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*

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* @since 6.5.0

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* @package WordPress

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* @subpackage Block Bindings

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*/

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/**

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* Gets value for Post Meta source.

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*

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* @since 6.5.0

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* @access private

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*

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* @param array $source_args Array containing source arguments used to look up the override value.

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* Example: array( "key" => "foo" ).

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* @param WP_Block $block_instance The block instance.

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* @return mixed The value computed for the source.

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*/

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function _block_bindings_post_meta_get_value( array $source_args, $block_instance ) {

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if ( empty( $source_args['key'] ) ) {

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return null;

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}

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if ( empty( $block_instance->context['postId'] ) ) {

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return null;

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}

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$post_id = $block_instance->context['postId'];

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// If a post isn't public, we need to prevent unauthorized users from accessing the post meta.

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$post = get_post( $post_id );

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if ( ( ! is_post_publicly_viewable( $post ) && ! current_user_can( 'read_post', $post_id ) ) || post_password_required( $post ) ) {

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return null;

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}

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// Check if the meta field is protected.

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if ( is_protected_meta( $source_args['key'], 'post' ) ) {

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return null;

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}

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// Check if the meta field is registered to be shown in REST.

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$meta_keys = get_registered_meta_keys( 'post', $block_instance->context['postType'] );

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// Add fields registered for all subtypes.

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$meta_keys = array_merge( $meta_keys, get_registered_meta_keys( 'post', '' ) );

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if ( empty( $meta_keys[ $source_args['key'] ]['show_in_rest'] ) ) {

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return null;

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}

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return get_post_meta( $post_id, $source_args['key'], true );

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}

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/**

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* Registers Post Meta source in the block bindings registry.

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*

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* @since 6.5.0

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* @access private

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*/

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function _register_block_bindings_post_meta_source() {

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register_block_bindings_source(

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'core/post-meta',

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array(

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'label' => _x( 'Post Meta', 'block bindings source' ),

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'get_value_callback' => '_block_bindings_post_meta_get_value',

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'uses_context' => array( 'postId', 'postType' ),

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)

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);

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}

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add_action( 'init', '_register_block_bindings_post_meta_source' );

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