<?php
/**
* Sitemaps: WP_Sitemaps class
*
* This is the main class integrating all other classes.
*
* @package WordPress
* @subpackage Sitemaps
* @since 5.5.0
*/

/**
* Class WP_Sitemaps.
*
* @since 5.5.0
*/
#[AllowDynamicProperties]
class WP_Sitemaps {
/**
* The main index of supported sitemaps.
*
* @since 5.5.0
*
* @var WP_Sitemaps_Index
*/
public $index;

/**
* The main registry of supported sitemaps.
*
* @since 5.5.0
*
* @var WP_Sitemaps_Registry
*/
public $registry;

/**
* An instance of the renderer class.
*
* @since 5.5.0
*
* @var WP_Sitemaps_Renderer
*/
public $renderer;

/**
* WP_Sitemaps constructor.
*
* @since 5.5.0
*/
public function __construct() {
$this->registry = new WP_Sitemaps_Registry();
$this->renderer = new WP_Sitemaps_Renderer();
$this->index = new WP_Sitemaps_Index( $this->registry );
}

/**
* Initiates all sitemap functionality.
*
* If sitemaps are disabled, only the rewrite rules will be registered
* by this method, in order to properly send 404s.
*
* @since 5.5.0
*/
public function init() {
// These will all fire on the init hook.
$this->register_rewrites();

add_action( 'template_redirect', array( $this, 'render_sitemaps' ) );

if ( ! $this->sitemaps_enabled() ) {
return;
}

$this->register_sitemaps();

// Add additional action callbacks.
add_filter( 'robots_txt', array( $this, 'add_robots' ), 0, 2 );
}

/**
* Determines whether sitemaps are enabled or not.
*
* @since 5.5.0
*
* @return bool Whether sitemaps are enabled.
*/
public function sitemaps_enabled() {
$is_enabled = (bool) get_option( 'blog_public' );

/**
* Filters whether XML Sitemaps are enabled or not.
*
* When XML Sitemaps are disabled via this filter, rewrite rules are still
* in place to ensure a 404 is returned.
*
* @see WP_Sitemaps::register_rewrites()
*
* @since 5.5.0
*
* @param bool $is_enabled Whether XML Sitemaps are enabled or not.
* Defaults to true for public sites.
*/
return (bool) apply_filters( 'wp_sitemaps_enabled', $is_enabled );
}

/**
* Registers and sets up the functionality for all supported sitemaps.
*
* @since 5.5.0
*/
public function register_sitemaps() {
$providers = array(
'posts' => new WP_Sitemaps_Posts(),
'taxonomies' => new WP_Sitemaps_Taxonomies(),
'users' => new WP_Sitemaps_Users(),
);

/* @var WP_Sitemaps_Provider $provider */
foreach ( $providers as $name => $provider ) {
$this->registry->add_provider( $name, $provider );
}
}

/**
* Registers sitemap rewrite tags and routing rules.
*
* @since 5.5.0
*/
public function register_rewrites() {
// Add rewrite tags.
add_rewrite_tag( '%sitemap%', '([^?]+)' );
add_rewrite_tag( '%sitemap-subtype%', '([^?]+)' );

// Register index route.
add_rewrite_rule( '^wp-sitemap\.xml$', 'index.php?sitemap=index', 'top' );

// Register rewrites for the XSL stylesheet.
add_rewrite_tag( '%sitemap-stylesheet%', '([^?]+)' );
add_rewrite_rule( '^wp-sitemap\.xsl$', 'index.php?sitemap-stylesheet=sitemap', 'top' );
add_rewrite_rule( '^wp-sitemap-index\.xsl$', 'index.php?sitemap-stylesheet=index', 'top' );

// Register routes for providers.
add_rewrite_rule(
'^wp-sitemap-([a-z]+?)-([a-z\d_-]+?)-(\d+?)\.xml$',
'index.php?sitemap=$matches[1]&sitemap-subtype=$matches[2]&paged=$matches[3]',
'top'
);
add_rewrite_rule(
'^wp-sitemap-([a-z]+?)-(\d+?)\.xml$',
'index.php?sitemap=$matches[1]&paged=$matches[2]',
'top'
);
}

/**
* Renders sitemap templates based on rewrite rules.
*
* @since 5.5.0
*
* @global WP_Query $wp_query WordPress Query object.
*/
public function render_sitemaps() {
global $wp_query;

$sitemap = sanitize_text_field( get_query_var( 'sitemap' ) );
$object_subtype = sanitize_text_field( get_query_var( 'sitemap-subtype' ) );
$stylesheet_type = sanitize_text_field( get_query_var( 'sitemap-stylesheet' ) );
$paged = absint( get_query_var( 'paged' ) );

// Bail early if this isn't a sitemap or stylesheet route.
if ( ! ( $sitemap || $stylesheet_type ) ) {
return;
}

if ( ! $this->sitemaps_enabled() ) {
$wp_query->set_404();
status_header( 404 );
return;
}

// Render stylesheet if this is stylesheet route.
if ( $stylesheet_type ) {
$stylesheet = new WP_Sitemaps_Stylesheet();

$stylesheet->render_stylesheet( $stylesheet_type );
exit;
}

// Render the index.
if ( 'index' === $sitemap ) {
$sitemap_list = $this->index->get_sitemap_list();

$this->renderer->render_index( $sitemap_list );
exit;
}

$provider = $this->registry->get_provider( $sitemap );

if ( ! $provider ) {
return;
}

if ( empty( $paged ) ) {
$paged = 1;
}

$url_list = $provider->get_url_list( $paged, $object_subtype );

// Force a 404 and bail early if no URLs are present.
if ( empty( $url_list ) ) {
$wp_query->set_404();
status_header( 404 );
return;
}

$this->renderer->render_sitemap( $url_list );
exit;
}

/**
* Redirects a URL to the wp-sitemap.xml
*
* @since 5.5.0
* @deprecated 6.7.0 Deprecated in favor of {@see WP_Rewrite::rewrite_rules()}
*
* @param bool $bypass Pass-through of the pre_handle_404 filter value.
* @param WP_Query $query The WP_Query object.
* @return bool Bypass value.
*/
public function redirect_sitemapxml( $bypass, $query ) {
_deprecated_function( __FUNCTION__, '6.7.0' );

// If a plugin has already utilized the pre_handle_404 function, return without action to avoid conflicts.
if ( $bypass ) {
return $bypass;
}

// 'pagename' is for most permalink types, name is for when the %postname% is used as a top-level field.
if ( 'sitemap-xml' === $query->get( 'pagename' )
|| 'sitemap-xml' === $query->get( 'name' )
) {
wp_safe_redirect( $this->index->get_index_url() );
exit();
}

return $bypass;
}

/**
* Adds the sitemap index to robots.txt.
*
* @since 5.5.0
*
* @param string $output robots.txt output.
* @param bool $is_public Whether the site is public.
* @return string The robots.txt output.
*/
public function add_robots( $output, $is_public ) {
if ( $is_public ) {
$output .= "\nSitemap: " . esc_url( $this->index->get_index_url() ) . "\n";
}

return $output;
}
}