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<?php
/**
* Sitemaps: WP_Sitemaps_Renderer class
*
* Responsible for rendering Sitemaps data to XML in accordance with sitemap protocol.
*
* @package WordPress
* @subpackage Sitemaps
* @since 5.5.0
*/
/**
* Class WP_Sitemaps_Renderer
*
* @since 5.5.0
*/
#[AllowDynamicProperties]
class WP_Sitemaps_Renderer {
/**
* XSL stylesheet for styling a sitemap for web browsers.
*
* @since 5.5.0
*
* @var string
*/
protected $stylesheet = '';
/**
* XSL stylesheet for styling a sitemap for web browsers.
*
* @since 5.5.0
*
* @var string
*/
protected $stylesheet_index = '';
/**
* WP_Sitemaps_Renderer constructor.
*
* @since 5.5.0
*/
public function __construct() {
$stylesheet_url = $this->get_sitemap_stylesheet_url();
if ( $stylesheet_url ) {
$this->stylesheet = '<?xml-stylesheet type="text/xsl" href="' . esc_url( $stylesheet_url ) . '" ?>';
}
$stylesheet_index_url = $this->get_sitemap_index_stylesheet_url();
if ( $stylesheet_index_url ) {
$this->stylesheet_index = '<?xml-stylesheet type="text/xsl" href="' . esc_url( $stylesheet_index_url ) . '" ?>';
}
}
/**
* Gets the URL for the sitemap stylesheet.
*
* @since 5.5.0
*
* @global WP_Rewrite $wp_rewrite WordPress rewrite component.
*
* @return string The sitemap stylesheet URL.
*/
public function get_sitemap_stylesheet_url() {
global $wp_rewrite;
$sitemap_url = home_url( '/wp-sitemap.xsl' );
if ( ! $wp_rewrite->using_permalinks() ) {
$sitemap_url = home_url( '/?sitemap-stylesheet=sitemap' );
}
/**
* Filters the URL for the sitemap stylesheet.
*
* If a falsey value is returned, no stylesheet will be used and
* the "raw" XML of the sitemap will be displayed.
*
* @since 5.5.0
*
* @param string $sitemap_url Full URL for the sitemaps XSL file.
*/
return apply_filters( 'wp_sitemaps_stylesheet_url', $sitemap_url );
}
/**
* Gets the URL for the sitemap index stylesheet.
*
* @since 5.5.0
*
* @global WP_Rewrite $wp_rewrite WordPress rewrite component.
*
* @return string The sitemap index stylesheet URL.
*/
public function get_sitemap_index_stylesheet_url() {
global $wp_rewrite;
$sitemap_url = home_url( '/wp-sitemap-index.xsl' );
if ( ! $wp_rewrite->using_permalinks() ) {
$sitemap_url = home_url( '/?sitemap-stylesheet=index' );
}
/**
* Filters the URL for the sitemap index stylesheet.
*
* If a falsey value is returned, no stylesheet will be used and
* the "raw" XML of the sitemap index will be displayed.
*
* @since 5.5.0
*
* @param string $sitemap_url Full URL for the sitemaps index XSL file.
*/
return apply_filters( 'wp_sitemaps_stylesheet_index_url', $sitemap_url );
}
/**
* Renders a sitemap index.
*
* @since 5.5.0
*
* @param array $sitemaps Array of sitemap URLs.
*/
public function render_index( $sitemaps ) {
header( 'Content-Type: application/xml; charset=UTF-8' );
$this->check_for_simple_xml_availability();
$index_xml = $this->get_sitemap_index_xml( $sitemaps );
if ( ! empty( $index_xml ) ) {
// All output is escaped within get_sitemap_index_xml().
echo $index_xml;
}
}
/**
* Gets XML for a sitemap index.
*
* @since 5.5.0
*
* @param array $sitemaps Array of sitemap URLs.
* @return string|false A well-formed XML string for a sitemap index. False on error.
*/
public function get_sitemap_index_xml( $sitemaps ) {
$sitemap_index = new SimpleXMLElement(
sprintf(
'%1$s%2$s%3$s',
'<?xml version="1.0" encoding="UTF-8" ?>',
$this->stylesheet_index,
'<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" />'
)
);
foreach ( $sitemaps as $entry ) {
$sitemap = $sitemap_index->addChild( 'sitemap' );
// Add each element as a child node to the <sitemap> entry.
foreach ( $entry as $name => $value ) {
if ( 'loc' === $name ) {
$sitemap->addChild( $name, esc_url( $value ) );
} elseif ( 'lastmod' === $name ) {
$sitemap->addChild( $name, esc_xml( $value ) );
} else {
_doing_it_wrong(
__METHOD__,
sprintf(
/* translators: %s: List of element names. */
__( 'Fields other than %s are not currently supported for the sitemap index.' ),
implode( ',', array( 'loc', 'lastmod' ) )
),
'5.5.0'
);
}
}
}
return $sitemap_index->asXML();
}
/**
* Renders a sitemap.
*
* @since 5.5.0
*
* @param array $url_list Array of URLs for a sitemap.
*/
public function render_sitemap( $url_list ) {
header( 'Content-Type: application/xml; charset=UTF-8' );
$this->check_for_simple_xml_availability();
$sitemap_xml = $this->get_sitemap_xml( $url_list );
if ( ! empty( $sitemap_xml ) ) {
// All output is escaped within get_sitemap_xml().
echo $sitemap_xml;
}
}
/**
* Gets XML for a sitemap.
*
* @since 5.5.0
*
* @param array $url_list Array of URLs for a sitemap.
* @return string|false A well-formed XML string for a sitemap index. False on error.
*/
public function get_sitemap_xml( $url_list ) {
$urlset = new SimpleXMLElement(
sprintf(
'%1$s%2$s%3$s',
'<?xml version="1.0" encoding="UTF-8" ?>',
$this->stylesheet,
'<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" />'
)
);
foreach ( $url_list as $url_item ) {
$url = $urlset->addChild( 'url' );
// Add each element as a child node to the <url> entry.
foreach ( $url_item as $name => $value ) {
if ( 'loc' === $name ) {
$url->addChild( $name, esc_url( $value ) );
} elseif ( in_array( $name, array( 'lastmod', 'changefreq', 'priority' ), true ) ) {
$url->addChild( $name, esc_xml( $value ) );
} else {
_doing_it_wrong(
__METHOD__,
sprintf(
/* translators: %s: List of element names. */
__( 'Fields other than %s are not currently supported for sitemaps.' ),
implode( ',', array( 'loc', 'lastmod', 'changefreq', 'priority' ) )
),
'5.5.0'
);
}
}
}
return $urlset->asXML();
}
/**
* Checks for the availability of the SimpleXML extension and errors if missing.
*
* @since 5.5.0
*/
private function check_for_simple_xml_availability() {
if ( ! class_exists( 'SimpleXMLElement' ) ) {
add_filter(
'wp_die_handler',
static function () {
return '_xml_wp_die_handler';
}
);
wp_die(
sprintf(
/* translators: %s: SimpleXML */
esc_xml( __( 'Could not generate XML sitemap due to missing %s extension' ) ),
'SimpleXML'
),
esc_xml( __( 'WordPress › Error' ) ),
array(
'response' => 501, // "Not implemented".
)
);
}
}
}