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<?php
/**
* Server-side rendering of the `core/footnotes` block.
*
* @package WordPress
*/
/**
* Renders the `core/footnotes` block on the server.
*
* @since 6.3.0
*
* @param array $attributes Block attributes.
* @param string $content Block default content.
* @param WP_Block $block Block instance.
*
* @return string Returns the HTML representing the footnotes.
*/
function render_block_core_footnotes( $attributes, $content, $block ) {
// Bail out early if the post ID is not set for some reason.
if ( empty( $block->context['postId'] ) ) {
return '';
}
if ( post_password_required( $block->context['postId'] ) ) {
return;
}
$footnotes = get_post_meta( $block->context['postId'], 'footnotes', true );
if ( ! $footnotes ) {
return;
}
$footnotes = json_decode( $footnotes, true );
if ( ! is_array( $footnotes ) || count( $footnotes ) === 0 ) {
return '';
}
$wrapper_attributes = get_block_wrapper_attributes();
$block_content = '';
foreach ( $footnotes as $footnote ) {
$block_content .= sprintf(
'<li id="%1$s">%2$s <a href="#%1$s-link">↩︎</a></li>',
$footnote['id'],
$footnote['content']
);
}
return sprintf(
'<ol %1$s>%2$s</ol>',
$wrapper_attributes,
$block_content
);
}
/**
* Registers the `core/footnotes` block on the server.
*
* @since 6.3.0
*/
function register_block_core_footnotes() {
foreach ( array( 'post', 'page' ) as $post_type ) {
register_post_meta(
$post_type,
'footnotes',
array(
'show_in_rest' => true,
'single' => true,
'type' => 'string',
)
);
}
register_block_type_from_metadata(
__DIR__ . '/footnotes',
array(
'render_callback' => 'render_block_core_footnotes',
)
);
}
add_action( 'init', 'register_block_core_footnotes' );
/**
* Saves the footnotes meta value to the revision.
*
* @since 6.3.0
*
* @param int $revision_id The revision ID.
*/
function wp_save_footnotes_meta( $revision_id ) {
$post_id = wp_is_post_revision( $revision_id );
if ( $post_id ) {
$footnotes = get_post_meta( $post_id, 'footnotes', true );
if ( $footnotes ) {
// Can't use update_post_meta() because it doesn't allow revisions.
update_metadata( 'post', $revision_id, 'footnotes', wp_slash( $footnotes ) );
}
}
}
add_action( 'wp_after_insert_post', 'wp_save_footnotes_meta' );
/**
* Keeps track of the revision ID for "rest_after_insert_{$post_type}".
*
* @since 6.3.0
*
* @global int $wp_temporary_footnote_revision_id The footnote revision ID.
*
* @param int $revision_id The revision ID.
*/
function wp_keep_footnotes_revision_id( $revision_id ) {
global $wp_temporary_footnote_revision_id;
$wp_temporary_footnote_revision_id = $revision_id;
}
add_action( '_wp_put_post_revision', 'wp_keep_footnotes_revision_id' );
/**
* This is a specific fix for the REST API. The REST API doesn't update
* the post and post meta in one go (through `meta_input`). While it
* does fix the `wp_after_insert_post` hook to be called correctly after
* updating meta, it does NOT fix hooks such as post_updated and
* save_post, which are normally also fired after post meta is updated
* in `wp_insert_post()`. Unfortunately, `wp_save_post_revision` is
* added to the `post_updated` action, which means the meta is not
* available at the time, so we have to add it afterwards through the
* `"rest_after_insert_{$post_type}"` action.
*
* @since 6.3.0
*
* @global int $wp_temporary_footnote_revision_id The footnote revision ID.
*
* @param WP_Post $post The post object.
*/
function wp_add_footnotes_revisions_to_post_meta( $post ) {
global $wp_temporary_footnote_revision_id;
if ( $wp_temporary_footnote_revision_id ) {
$revision = get_post( $wp_temporary_footnote_revision_id );
if ( ! $revision ) {
return;
}
$post_id = $revision->post_parent;
// Just making sure we're updating the right revision.
if ( $post->ID === $post_id ) {
$footnotes = get_post_meta( $post_id, 'footnotes', true );
if ( $footnotes ) {
// Can't use update_post_meta() because it doesn't allow revisions.
update_metadata( 'post', $wp_temporary_footnote_revision_id, 'footnotes', wp_slash( $footnotes ) );
}
}
}
}
add_action( 'rest_after_insert_post', 'wp_add_footnotes_revisions_to_post_meta' );
add_action( 'rest_after_insert_page', 'wp_add_footnotes_revisions_to_post_meta' );
/**
* Restores the footnotes meta value from the revision.
*
* @since 6.3.0
*
* @param int $post_id The post ID.
* @param int $revision_id The revision ID.
*/
function wp_restore_footnotes_from_revision( $post_id, $revision_id ) {
$footnotes = get_post_meta( $revision_id, 'footnotes', true );
if ( $footnotes ) {
update_post_meta( $post_id, 'footnotes', wp_slash( $footnotes ) );
} else {
delete_post_meta( $post_id, 'footnotes' );
}
}
add_action( 'wp_restore_post_revision', 'wp_restore_footnotes_from_revision', 10, 2 );
/**
* Adds the footnotes field to the revision.
*
* @since 6.3.0
*
* @param array $fields The revision fields.
* @return array The revision fields.
*/
function wp_add_footnotes_to_revision( $fields ) {
$fields['footnotes'] = __( 'Footnotes' );
return $fields;
}
add_filter( '_wp_post_revision_fields', 'wp_add_footnotes_to_revision' );
/**
* Gets the footnotes field from the revision.
*
* @since 6.3.0
*
* @param string $revision_field The field value, but $revision->$field
* (footnotes) does not exist.
* @param string $field The field name, in this case "footnotes".
* @param object $revision The revision object to compare against.
* @return string The field value.
*/
function wp_get_footnotes_from_revision( $revision_field, $field, $revision ) {
return get_metadata( 'post', $revision->ID, $field, true );
}
add_filter( '_wp_post_revision_field_footnotes', 'wp_get_footnotes_from_revision', 10, 3 );
/**
* The REST API autosave endpoint doesn't save meta, so we can use the
* `wp_creating_autosave` when it updates an exiting autosave, and
* `_wp_put_post_revision` when it creates a new autosave.
*
* @since 6.3.0
*
* @param int|array $autosave The autosave ID or array.
*/
function _wp_rest_api_autosave_meta( $autosave ) {
// Ensure it's a REST API request.
if ( ! defined( 'REST_REQUEST' ) || ! REST_REQUEST ) {
return;
}
$body = rest_get_server()->get_raw_data();
$body = json_decode( $body, true );
if ( ! isset( $body['meta']['footnotes'] ) ) {
return;
}
// `wp_creating_autosave` passes the array,
// `_wp_put_post_revision` passes the ID.
$id = is_int( $autosave ) ? $autosave : $autosave['ID'];
if ( ! $id ) {
return;
}
update_post_meta( $id, 'footnotes', wp_slash( $body['meta']['footnotes'] ) );
}
// See https://github.com/WordPress/wordpress-develop/blob/2103cb9966e57d452c94218bbc3171579b536a40/src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php#L391C1-L391C1.
add_action( 'wp_creating_autosave', '_wp_rest_api_autosave_meta' );
// See https://github.com/WordPress/wordpress-develop/blob/2103cb9966e57d452c94218bbc3171579b536a40/src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php#L398.
// Then https://github.com/WordPress/wordpress-develop/blob/2103cb9966e57d452c94218bbc3171579b536a40/src/wp-includes/revision.php#L367.
add_action( '_wp_put_post_revision', '_wp_rest_api_autosave_meta' );
/**
* This is a workaround for the autosave endpoint returning early if the
* revision field are equal. The problem is that "footnotes" is not real
* revision post field, so there's nothing to compare against.
*
* This trick sets the "footnotes" field (value doesn't matter), which will
* cause the autosave endpoint to always update the latest revision. That should
* be fine, it should be ok to update the revision even if nothing changed. Of
* course, this is temporary fix.
*
* @since 6.3.0
*
* @param WP_Post $prepared_post The prepared post object.
* @param WP_REST_Request $request The request object.
*
* See https://github.com/WordPress/wordpress-develop/blob/2103cb9966e57d452c94218bbc3171579b536a40/src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php#L365-L384.
* See https://github.com/WordPress/wordpress-develop/blob/2103cb9966e57d452c94218bbc3171579b536a40/src/wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php#L219.
*/
function _wp_rest_api_force_autosave_difference( $prepared_post, $request ) {
// We only want to be altering POST requests.
if ( $request->get_method() !== 'POST' ) {
return $prepared_post;
}
// Only alter requests for the '/autosaves' route.
if ( substr( $request->get_route(), -strlen( '/autosaves' ) ) !== '/autosaves' ) {
return $prepared_post;
}
$prepared_post->footnotes = '[]';
return $prepared_post;
}
add_filter( 'rest_pre_insert_post', '_wp_rest_api_force_autosave_difference', 10, 2 );