Add upstream

wp-content/plugins/jetpack/modules/sitemaps/sitemap-buffer-news-fallback.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ * Sitemaps (per the protocol) are essentially lists of XML fragments;
+ * lists which are subject to size constraints. The Jetpack_Sitemap_Buffer_News
+ * extends the Jetpack_Sitemap_Buffer class to represent the single news sitemap
+ * buffer.
+ *
+ * @since 5.3.0
+ * @package Jetpack
+ */
+
+/**
+ * A buffer for constructing sitemap image xml files for users without libxml support.
+ *
+ * @since 5.3.0
+ */
+class Jetpack_Sitemap_Buffer_News extends Jetpack_Sitemap_Buffer_Fallback {
+
+	protected function get_root_element() {
+		if ( ! isset( $this->root ) ) {
+
+			/**
+			 * Filter the attribute value pairs used for namespace and namespace URI mappings.
+			 *
+			 * @module sitemaps
+			 *
+			 * @since 4.8.0
+			 *
+			 * @param array $namespaces Associative array with namespaces and namespace URIs.
+			 */
+			$namespaces = apply_filters(
+				'jetpack_sitemap_news_ns',
+				array(
+					'xmlns:xsi'          => 'http://www.w3.org/2001/XMLSchema-instance',
+					'xsi:schemaLocation' => 'http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd',
+					'xmlns'              => 'http://www.sitemaps.org/schemas/sitemap/0.9',
+					'xmlns:news'         => 'http://www.google.com/schemas/sitemap-news/0.9',
+				)
+			);
+
+			$jetpack_version      = JETPACK__VERSION;
+			$news_sitemap_xsl_url = $this->finder->construct_sitemap_url( 'news-sitemap.xsl' );
+
+			$this->root = array(
+				"<!-- generator='jetpack-{$jetpack_version}' -->" . PHP_EOL
+				. "<?xml-stylesheet type='text/xsl' href='{$news_sitemap_xsl_url}'?>" . PHP_EOL
+				. '<urlset ' . $this->array_to_xml_attr_string( $namespaces ) . '>',
+				'</urlset>',
+			);
+
+			$this->byte_capacity -= strlen( join( '', $this->root ) );
+		}
+
+		return $this->root;
+	}
+}