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<?php
/**
* Customize API: WP_Customize_Selective_Refresh class
*
* @package WordPress
* @subpackage Customize
* @since 4.5.0
*/
/**
* Core Customizer class for implementing selective refresh.
*
* @since 4.5.0
*/
#[AllowDynamicProperties]
final class WP_Customize_Selective_Refresh {
/**
* Query var used in requests to render partials.
*
* @since 4.5.0
*/
const RENDER_QUERY_VAR = 'wp_customize_render_partials';
/**
* Customize manager.
*
* @since 4.5.0
* @var WP_Customize_Manager
*/
public $manager;
/**
* Registered instances of WP_Customize_Partial.
*
* @since 4.5.0
* @var WP_Customize_Partial[]
*/
protected $partials = array();
/**
* Log of errors triggered when partials are rendered.
*
* @since 4.5.0
* @var array
*/
protected $triggered_errors = array();
/**
* Keep track of the current partial being rendered.
*
* @since 4.5.0
* @var string|null
*/
protected $current_partial_id;
/**
* Plugin bootstrap for Partial Refresh functionality.
*
* @since 4.5.0
*
* @param WP_Customize_Manager $manager Customizer bootstrap instance.
*/
public function __construct( WP_Customize_Manager $manager ) {
$this->manager = $manager;
require_once ABSPATH . WPINC . '/customize/class-wp-customize-partial.php';
add_action( 'customize_preview_init', array( $this, 'init_preview' ) );
}
/**
* Retrieves the registered partials.
*
* @since 4.5.0
*
* @return array Partials.
*/
public function partials() {
return $this->partials;
}
/**
* Adds a partial.
*
* @since 4.5.0
*
* @see WP_Customize_Partial::__construct()
*
* @param WP_Customize_Partial|string $id Customize Partial object, or Partial ID.
* @param array $args Optional. Array of properties for the new Partials object.
* See WP_Customize_Partial::__construct() for information
* on accepted arguments. Default empty array.
* @return WP_Customize_Partial The instance of the partial that was added.
*/
public function add_partial( $id, $args = array() ) {
if ( $id instanceof WP_Customize_Partial ) {
$partial = $id;
} else {
$class = 'WP_Customize_Partial';
/** This filter is documented in wp-includes/customize/class-wp-customize-selective-refresh.php */
$args = apply_filters( 'customize_dynamic_partial_args', $args, $id );
/** This filter is documented in wp-includes/customize/class-wp-customize-selective-refresh.php */
$class = apply_filters( 'customize_dynamic_partial_class', $class, $id, $args );
$partial = new $class( $this, $id, $args );
}
$this->partials[ $partial->id ] = $partial;
return $partial;
}
/**
* Retrieves a partial.
*
* @since 4.5.0
*
* @param string $id Customize Partial ID.
* @return WP_Customize_Partial|null The partial, if set. Otherwise null.
*/
public function get_partial( $id ) {
if ( isset( $this->partials[ $id ] ) ) {
return $this->partials[ $id ];
} else {
return null;
}
}
/**
* Removes a partial.
*
* @since 4.5.0
*
* @param string $id Customize Partial ID.
*/
public function remove_partial( $id ) {
unset( $this->partials[ $id ] );
}
/**
* Initializes the Customizer preview.
*
* @since 4.5.0
*/
public function init_preview() {
add_action( 'template_redirect', array( $this, 'handle_render_partials_request' ) );
add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_preview_scripts' ) );
}
/**
* Enqueues preview scripts.
*
* @since 4.5.0
*/
public function enqueue_preview_scripts() {
wp_enqueue_script( 'customize-selective-refresh' );
add_action( 'wp_footer', array( $this, 'export_preview_data' ), 1000 );
}
/**
* Exports data in preview after it has finished rendering so that partials can be added at runtime.
*
* @since 4.5.0
*/
public function export_preview_data() {
$partials = array();
foreach ( $this->partials() as $partial ) {
if ( $partial->check_capabilities() ) {
$partials[ $partial->id ] = $partial->json();
}
}
$switched_locale = switch_to_user_locale( get_current_user_id() );
$l10n = array(
'shiftClickToEdit' => __( 'Shift-click to edit this element.' ),
'clickEditMenu' => __( 'Click to edit this menu.' ),
'clickEditWidget' => __( 'Click to edit this widget.' ),
'clickEditTitle' => __( 'Click to edit the site title.' ),
'clickEditMisc' => __( 'Click to edit this element.' ),
/* translators: %s: document.write() */
'badDocumentWrite' => sprintf( __( '%s is forbidden' ), 'document.write()' ),
);
if ( $switched_locale ) {
restore_previous_locale();
}
$exports = array(
'partials' => $partials,
'renderQueryVar' => self::RENDER_QUERY_VAR,
'l10n' => $l10n,
);
// Export data to JS.
wp_print_inline_script_tag( sprintf( 'var _customizePartialRefreshExports = %s;', wp_json_encode( $exports, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ) ) . "\n//# sourceURL=" . rawurlencode( __METHOD__ ) );
}
/**
* Registers dynamically-created partials.
*
* @since 4.5.0
*
* @see WP_Customize_Manager::add_dynamic_settings()
*
* @param string[] $partial_ids Array of the partial IDs to add.
* @return WP_Customize_Partial[] Array of added WP_Customize_Partial instances.
*/
public function add_dynamic_partials( $partial_ids ) {
$new_partials = array();
foreach ( $partial_ids as $partial_id ) {
// Skip partials already created.
$partial = $this->get_partial( $partial_id );
if ( $partial ) {
continue;
}
$partial_args = false;
$partial_class = 'WP_Customize_Partial';
/**
* Filters a dynamic partial's constructor arguments.
*
* For a dynamic partial to be registered, this filter must be employed
* to override the default false value with an array of args to pass to
* the WP_Customize_Partial constructor.
*
* @since 4.5.0
*
* @param false|array $partial_args The arguments to the WP_Customize_Partial constructor.
* @param string $partial_id ID for dynamic partial.
*/
$partial_args = apply_filters( 'customize_dynamic_partial_args', $partial_args, $partial_id );
if ( false === $partial_args ) {
continue;
}
/**
* Filters the class used to construct partials.
*
* Allow non-statically created partials to be constructed with custom WP_Customize_Partial subclass.
*
* @since 4.5.0
*
* @param string $partial_class WP_Customize_Partial or a subclass.
* @param string $partial_id ID for dynamic partial.
* @param array $partial_args The arguments to the WP_Customize_Partial constructor.
*/
$partial_class = apply_filters( 'customize_dynamic_partial_class', $partial_class, $partial_id, $partial_args );
$partial = new $partial_class( $this, $partial_id, $partial_args );
$this->add_partial( $partial );
$new_partials[] = $partial;
}
return $new_partials;
}
/**
* Checks whether the request is for rendering partials.
*
* Note that this will not consider whether the request is authorized or valid,
* just that essentially the route is a match.
*
* @since 4.5.0
*
* @return bool Whether the request is for rendering partials.
*/
public function is_render_partials_request() {
return ! empty( $_POST[ self::RENDER_QUERY_VAR ] );
}
/**
* Handles PHP errors triggered during rendering the partials.
*
* These errors will be relayed back to the client in the Ajax response.
*
* @since 4.5.0
*
* @param int $errno Error number.
* @param string $errstr Error string.
* @param string $errfile Error file.
* @param int $errline Error line.
* @return true Always true.
*/
public function handle_error( $errno, $errstr, $errfile = null, $errline = null ) {
$this->triggered_errors[] = array(
'partial' => $this->current_partial_id,
'error_number' => $errno,
'error_string' => $errstr,
'error_file' => $errfile,
'error_line' => $errline,
);
return true;
}
/**
* Handles the Ajax request to return the rendered partials for the requested placements.
*
* @since 4.5.0
*/
public function handle_render_partials_request() {
if ( ! $this->is_render_partials_request() ) {
return;
}
/*
* Note that is_customize_preview() returning true will entail that the
* user passed the 'customize' capability check and the nonce check, since
* WP_Customize_Manager::setup_theme() is where the previewing flag is set.
*/
if ( ! is_customize_preview() ) {
wp_send_json_error( 'expected_customize_preview', 403 );
} elseif ( ! isset( $_POST['partials'] ) ) {
wp_send_json_error( 'missing_partials', 400 );
}
// Ensure that doing selective refresh on 404 template doesn't result in fallback rendering behavior (full refreshes).
status_header( 200 );
$partials = json_decode( wp_unslash( $_POST['partials'] ), true );
if ( ! is_array( $partials ) ) {
wp_send_json_error( 'malformed_partials' );
}
$this->add_dynamic_partials( array_keys( $partials ) );
/**
* Fires immediately before partials are rendered.
*
* Plugins may do things like call wp_enqueue_scripts() and gather a list of the scripts
* and styles which may get enqueued in the response.
*
* @since 4.5.0
*
* @param WP_Customize_Selective_Refresh $refresh Selective refresh component.
* @param array $partials Placements' context data for the partials rendered in the request.
* The array is keyed by partial ID, with each item being an array of
* the placements' context data.
*/
do_action( 'customize_render_partials_before', $this, $partials );
set_error_handler( array( $this, 'handle_error' ), error_reporting() );
$contents = array();
foreach ( $partials as $partial_id => $container_contexts ) {
$this->current_partial_id = $partial_id;
if ( ! is_array( $container_contexts ) ) {
wp_send_json_error( 'malformed_container_contexts' );
}
$partial = $this->get_partial( $partial_id );
if ( ! $partial || ! $partial->check_capabilities() ) {
$contents[ $partial_id ] = null;
continue;
}
$contents[ $partial_id ] = array();
// @todo The array should include not only the contents, but also whether the container is included?
if ( empty( $container_contexts ) ) {
// Since there are no container contexts, render just once.
$contents[ $partial_id ][] = $partial->render( null );
} else {
foreach ( $container_contexts as $container_context ) {
$contents[ $partial_id ][] = $partial->render( $container_context );
}
}
}
$this->current_partial_id = null;
restore_error_handler();
/**
* Fires immediately after partials are rendered.
*
* Plugins may do things like call wp_footer() to scrape scripts output and return them
* via the {@see 'customize_render_partials_response'} filter.
*
* @since 4.5.0
*
* @param WP_Customize_Selective_Refresh $refresh Selective refresh component.
* @param array $partials Placements' context data for the partials rendered in the request.
* The array is keyed by partial ID, with each item being an array of
* the placements' context data.
*/
do_action( 'customize_render_partials_after', $this, $partials );
$response = array(
'contents' => $contents,
);
if ( defined( 'WP_DEBUG_DISPLAY' ) && WP_DEBUG_DISPLAY ) {
$response['errors'] = $this->triggered_errors;
}
$setting_validities = $this->manager->validate_setting_values( $this->manager->unsanitized_post_values() );
$exported_setting_validities = array_map( array( $this->manager, 'prepare_setting_validity_for_js' ), $setting_validities );
$response['setting_validities'] = $exported_setting_validities;
/**
* Filters the response from rendering the partials.
*
* Plugins may use this filter to inject `$scripts` and `$styles`, which are dependencies
* for the partials being rendered. The response data will be available to the client via
* the `render-partials-response` JS event, so the client can then inject the scripts and
* styles into the DOM if they have not already been enqueued there.
*
* If plugins do this, they'll need to take care for any scripts that do `document.write()`
* and make sure that these are not injected, or else to override the function to no-op,
* or else the page will be destroyed.
*
* Plugins should be aware that `$scripts` and `$styles` may eventually be included by
* default in the response.
*
* @since 4.5.0
*
* @param array $response {
* Response.
*
* @type array $contents Associative array mapping a partial ID its corresponding array of contents
* for the containers requested.
* @type array $errors List of errors triggered during rendering of partials, if `WP_DEBUG_DISPLAY`
* is enabled.
* }
* @param WP_Customize_Selective_Refresh $refresh Selective refresh component.
* @param array $partials Placements' context data for the partials rendered in the request.
* The array is keyed by partial ID, with each item being an array of
* the placements' context data.
*/
$response = apply_filters( 'customize_render_partials_response', $response, $this, $partials );
wp_send_json_success( $response );
}
}