diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/sitemaps/providers/class-wp-sitemaps-users.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/sitemaps/providers/class-wp-sitemaps-users.php	Tue Dec 15 13:49:49 2020 +0100
@@ -0,0 +1,163 @@
+<?php
+/**
+ * Sitemaps: WP_Sitemaps_Users class
+ *
+ * Builds the sitemaps for the 'user' object type.
+ *
+ * @package WordPress
+ * @subpackage Sitemaps
+ * @since 5.5.0
+ */
+
+/**
+ * Users XML sitemap provider.
+ *
+ * @since 5.5.0
+ */
+class WP_Sitemaps_Users extends WP_Sitemaps_Provider {
+	/**
+	 * WP_Sitemaps_Users constructor.
+	 *
+	 * @since 5.5.0
+	 */
+	public function __construct() {
+		$this->name        = 'users';
+		$this->object_type = 'user';
+	}
+
+	/**
+	 * Gets a URL list for a user sitemap.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @param int    $page_num       Page of results.
+	 * @param string $object_subtype Optional. Not applicable for Users but
+	 *                               required for compatibility with the parent
+	 *                               provider class. Default empty.
+	 * @return array Array of URLs for a sitemap.
+	 */
+	public function get_url_list( $page_num, $object_subtype = '' ) {
+		/**
+		 * Filters the users URL list before it is generated.
+		 *
+		 * Passing a non-null value will effectively short-circuit the generation,
+		 * returning that value instead.
+		 *
+		 * @since 5.5.0
+		 *
+		 * @param array  $url_list The URL list. Default null.
+		 * @param int    $page_num Page of results.
+		 */
+		$url_list = apply_filters(
+			'wp_sitemaps_users_pre_url_list',
+			null,
+			$page_num
+		);
+
+		if ( null !== $url_list ) {
+			return $url_list;
+		}
+
+		$args          = $this->get_users_query_args();
+		$args['paged'] = $page_num;
+
+		$query    = new WP_User_Query( $args );
+		$users    = $query->get_results();
+		$url_list = array();
+
+		foreach ( $users as $user ) {
+			$sitemap_entry = array(
+				'loc' => get_author_posts_url( $user->ID ),
+			);
+
+			/**
+			 * Filters the sitemap entry for an individual user.
+			 *
+			 * @since 5.5.0
+			 *
+			 * @param array   $sitemap_entry Sitemap entry for the user.
+			 * @param WP_User $user          User object.
+			 */
+			$sitemap_entry = apply_filters( 'wp_sitemaps_users_entry', $sitemap_entry, $user );
+			$url_list[]    = $sitemap_entry;
+		}
+
+		return $url_list;
+	}
+
+	/**
+	 * Gets the max number of pages available for the object type.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @see WP_Sitemaps_Provider::max_num_pages
+	 *
+	 * @param string $object_subtype Optional. Not applicable for Users but
+	 *                               required for compatibility with the parent
+	 *                               provider class. Default empty.
+	 * @return int Total page count.
+	 */
+	public function get_max_num_pages( $object_subtype = '' ) {
+		/**
+		 * Filters the max number of pages before it is generated.
+		 *
+		 * Passing a non-null value will effectively short-circuit the generation,
+		 * returning that value instead.
+		 *
+		 * @since 5.5.0
+		 *
+		 * @param int $max_num_pages The maximum number of pages. Default null.
+		 */
+		$max_num_pages = apply_filters( 'wp_sitemaps_users_pre_max_num_pages', null );
+
+		if ( null !== $max_num_pages ) {
+			return $max_num_pages;
+		}
+
+		$args  = $this->get_users_query_args();
+		$query = new WP_User_Query( $args );
+
+		$total_users = $query->get_total();
+
+		return (int) ceil( $total_users / wp_sitemaps_get_max_urls( $this->object_type ) );
+	}
+
+	/**
+	 * Returns the query args for retrieving users to list in the sitemap.
+	 *
+	 * @since 5.5.0
+	 *
+	 * @return array Array of WP_User_Query arguments.
+	 */
+	protected function get_users_query_args() {
+		$public_post_types = get_post_types(
+			array(
+				'public' => true,
+			)
+		);
+
+		// We're not supporting sitemaps for author pages for attachments.
+		unset( $public_post_types['attachment'] );
+
+		/**
+		 * Filters the query arguments for authors with public posts.
+		 *
+		 * Allows modification of the authors query arguments before querying.
+		 *
+		 * @see WP_User_Query for a full list of arguments
+		 *
+		 * @since 5.5.0
+		 *
+		 * @param array $args Array of WP_User_Query arguments.
+		 */
+		$args = apply_filters(
+			'wp_sitemaps_users_query_args',
+			array(
+				'has_published_posts' => array_keys( $public_post_types ),
+				'number'              => wp_sitemaps_get_max_urls( $this->object_type ),
+			)
+		);
+
+		return $args;
+	}
+}