1<?php
  2/**
  3 * Post Data source for Block Bindings.
  4 *
  5 * @since 6.9.0
  6 * @package WordPress
  7 * @subpackage Block Bindings
  8 */
  9
 10/**
 11 * Gets value for Post Data source.
 12 *
 13 * @since 6.9.0
 14 * @access private
 15 *
 16 * @param array    $source_args    Array containing arguments used to look up the source value.
 17 *                                 Example: array( "field" => "foo" ).
 18 * @param WP_Block $block_instance The block instance.
 19 * @return mixed The value computed for the source.
 20 */
 21function _block_bindings_post_data_get_value( array $source_args, $block_instance ) {
 22	if ( empty( $source_args['field'] ) ) {
 23		// Backward compatibility for when the source argument was called `key` in Gutenberg plugin.
 24		if ( empty( $source_args['key'] ) ) {
 25			return null;
 26		}
 27		$field = $source_args['key'];
 28	} else {
 29		$field = $source_args['field'];
 30	}
 31
 32	/*
 33	 * BACKWARDS COMPATIBILITY: Hardcoded exception for navigation blocks.
 34	 * Required for WordPress 6.9+ navigation blocks. DO NOT REMOVE.
 35	 */
 36	$block_name          = $block_instance->name ?? '';
 37	$is_navigation_block = in_array(
 38		$block_name,
 39		array( 'core/navigation-link', 'core/navigation-submenu' ),
 40		true
 41	);
 42
 43	if ( $is_navigation_block ) {
 44		// Navigation blocks: read from block attributes.
 45		$post_id = $block_instance->attributes['id'] ?? null;
 46	} else {
 47		// All other blocks: use context.
 48		$post_id = $block_instance->context['postId'] ?? null;
 49	}
 50
 51	// If we don't have an entity ID, bail early.
 52	if ( empty( $post_id ) ) {
 53		return null;
 54	}
 55
 56	// If a post isn't public, we need to prevent unauthorized users from accessing the post data.
 57	$post = get_post( $post_id );
 58	if ( ( ! is_post_publicly_viewable( $post ) && ! current_user_can( 'read_post', $post_id ) ) || post_password_required( $post ) ) {
 59		return null;
 60	}
 61
 62	if ( 'date' === $field ) {
 63		return esc_attr( get_the_date( 'c', $post_id ) );
 64	}
 65
 66	if ( 'modified' === $field ) {
 67		// Only return the modified date if it is later than the publishing date.
 68		if ( get_the_modified_date( 'U', $post_id ) > get_the_date( 'U', $post_id ) ) {
 69			return esc_attr( get_the_modified_date( 'c', $post_id ) );
 70		} else {
 71			return '';
 72		}
 73	}
 74
 75	if ( 'link' === $field ) {
 76		$permalink = get_permalink( $post_id );
 77		return false === $permalink ? null : esc_url( $permalink );
 78	}
 79}
 80
 81/**
 82 * Registers Post Data source in the block bindings registry.
 83 *
 84 * @since 6.9.0
 85 * @access private
 86 */
 87function _register_block_bindings_post_data_source() {
 88	register_block_bindings_source(
 89		'core/post-data',
 90		array(
 91			'label'              => _x( 'Post Data', 'block bindings source' ),
 92			'get_value_callback' => '_block_bindings_post_data_get_value',
 93			'uses_context'       => array( 'postId', 'postType' ), // Both are needed on the client side.
 94		)
 95	);
 96}
 97
 98add_action( 'init', '_register_block_bindings_post_data_source' );
 99