From a415c29efee45520ae252d2aa28f1083a521cd7b Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 09:56:49 +0200
Subject: Adding upstream version 6.4.3+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 wp-includes/class-wp-navigation-fallback.php | 303 +++++++++++++++++++++++++++
 1 file changed, 303 insertions(+)
 create mode 100644 wp-includes/class-wp-navigation-fallback.php

(limited to 'wp-includes/class-wp-navigation-fallback.php')

diff --git a/wp-includes/class-wp-navigation-fallback.php b/wp-includes/class-wp-navigation-fallback.php
new file mode 100644
index 0000000..59fe023
--- /dev/null
+++ b/wp-includes/class-wp-navigation-fallback.php
@@ -0,0 +1,303 @@
+<?php
+/**
+ * WP_Navigation_Fallback class
+ *
+ * Manages fallback behavior for Navigation menus.
+ *
+ * @package WordPress
+ * @subpackage Navigation
+ * @since 6.3.0
+ */
+
+/**
+ * Manages fallback behavior for Navigation menus.
+ *
+ * @access public
+ * @since 6.3.0
+ */
+class WP_Navigation_Fallback {
+
+	/**
+	 * Updates the wp_navigation custom post type schema, in order to expose
+	 * additional fields in the embeddable links of WP_REST_Navigation_Fallback_Controller.
+	 *
+	 * The Navigation Fallback endpoint may embed the full Navigation Menu object
+	 * into the response as the `self` link. By default, the Posts Controller
+	 * will only expose a limited subset of fields but the editor requires
+	 * additional fields to be available in order to utilize the menu.
+	 *
+	 * Used with the `rest_wp_navigation_item_schema` hook.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param array $schema The schema for the `wp_navigation` post.
+	 * @return array The modified schema.
+	 */
+	public static function update_wp_navigation_post_schema( $schema ) {
+		// Expose top level fields.
+		$schema['properties']['status']['context']  = array_merge( $schema['properties']['status']['context'], array( 'embed' ) );
+		$schema['properties']['content']['context'] = array_merge( $schema['properties']['content']['context'], array( 'embed' ) );
+
+		/*
+		 * Exposes sub properties of content field.
+		 * These sub properties aren't exposed by the posts controller by default,
+		 * for requests where context is `embed`.
+		 *
+		 * @see WP_REST_Posts_Controller::get_item_schema()
+		 */
+		$schema['properties']['content']['properties']['raw']['context']           = array_merge( $schema['properties']['content']['properties']['raw']['context'], array( 'embed' ) );
+		$schema['properties']['content']['properties']['rendered']['context']      = array_merge( $schema['properties']['content']['properties']['rendered']['context'], array( 'embed' ) );
+		$schema['properties']['content']['properties']['block_version']['context'] = array_merge( $schema['properties']['content']['properties']['block_version']['context'], array( 'embed' ) );
+
+		/*
+		 * Exposes sub properties of title field.
+		 * These sub properties aren't exposed by the posts controller by default,
+		 * for requests where context is `embed`.
+		 *
+		 * @see WP_REST_Posts_Controller::get_item_schema()
+		 */
+		$schema['properties']['title']['properties']['raw']['context'] = array_merge( $schema['properties']['title']['properties']['raw']['context'], array( 'embed' ) );
+
+		return $schema;
+	}
+
+	/**
+	 * Gets (and/or creates) an appropriate fallback Navigation Menu.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @return WP_Post|null the fallback Navigation Post or null.
+	 */
+	public static function get_fallback() {
+		/**
+		 * Filters whether or not a fallback should be created.
+		 *
+		 * @since 6.3.0
+		 *
+		 * @param bool $create Whether to create a fallback navigation menu. Default true.
+		 */
+		$should_create_fallback = apply_filters( 'wp_navigation_should_create_fallback', true );
+
+		$fallback = static::get_most_recently_published_navigation();
+
+		if ( $fallback || ! $should_create_fallback ) {
+			return $fallback;
+		}
+
+		$fallback = static::create_classic_menu_fallback();
+
+		if ( $fallback && ! is_wp_error( $fallback ) ) {
+			// Return the newly created fallback post object which will now be the most recently created navigation menu.
+			return $fallback instanceof WP_Post ? $fallback : static::get_most_recently_published_navigation();
+		}
+
+		$fallback = static::create_default_fallback();
+
+		if ( $fallback && ! is_wp_error( $fallback ) ) {
+			// Return the newly created fallback post object which will now be the most recently created navigation menu.
+			return $fallback instanceof WP_Post ? $fallback : static::get_most_recently_published_navigation();
+		}
+
+		return null;
+	}
+
+	/**
+	 * Finds the most recently published `wp_navigation` post type.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @return WP_Post|null the first non-empty Navigation or null.
+	 */
+	private static function get_most_recently_published_navigation() {
+
+		$parsed_args = array(
+			'post_type'              => 'wp_navigation',
+			'no_found_rows'          => true,
+			'update_post_meta_cache' => false,
+			'update_post_term_cache' => false,
+			'order'                  => 'DESC',
+			'orderby'                => 'date',
+			'post_status'            => 'publish',
+			'posts_per_page'         => 1,
+		);
+
+		$navigation_post = new WP_Query( $parsed_args );
+
+		if ( count( $navigation_post->posts ) > 0 ) {
+			return $navigation_post->posts[0];
+		}
+
+		return null;
+	}
+
+	/**
+	 * Creates a Navigation Menu post from a Classic Menu.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @return int|WP_Error The post ID of the default fallback menu or a WP_Error object.
+	 */
+	private static function create_classic_menu_fallback() {
+		// See if we have a classic menu.
+		$classic_nav_menu = static::get_fallback_classic_menu();
+
+		if ( ! $classic_nav_menu ) {
+			return new WP_Error( 'no_classic_menus', __( 'No Classic Menus found.' ) );
+		}
+
+		// If there is a classic menu then convert it to blocks.
+		$classic_nav_menu_blocks = WP_Classic_To_Block_Menu_Converter::convert( $classic_nav_menu );
+
+		if ( is_wp_error( $classic_nav_menu_blocks ) ) {
+			return $classic_nav_menu_blocks;
+		}
+
+		if ( empty( $classic_nav_menu_blocks ) ) {
+			return new WP_Error( 'cannot_convert_classic_menu', __( 'Unable to convert Classic Menu to blocks.' ) );
+		}
+
+		// Create a new navigation menu from the classic menu.
+		$classic_menu_fallback = wp_insert_post(
+			array(
+				'post_content' => $classic_nav_menu_blocks,
+				'post_title'   => $classic_nav_menu->name,
+				'post_name'    => $classic_nav_menu->slug,
+				'post_status'  => 'publish',
+				'post_type'    => 'wp_navigation',
+			),
+			true // So that we can check whether the result is an error.
+		);
+
+		return $classic_menu_fallback;
+	}
+
+	/**
+	 * Determines the most appropriate classic navigation menu to use as a fallback.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @return WP_Term|null The most appropriate classic navigation menu to use as a fallback.
+	 */
+	private static function get_fallback_classic_menu() {
+		$classic_nav_menus = wp_get_nav_menus();
+
+		if ( ! $classic_nav_menus || is_wp_error( $classic_nav_menus ) ) {
+			return null;
+		}
+
+		$nav_menu = static::get_nav_menu_at_primary_location();
+
+		if ( $nav_menu ) {
+			return $nav_menu;
+		}
+
+		$nav_menu = static::get_nav_menu_with_primary_slug( $classic_nav_menus );
+
+		if ( $nav_menu ) {
+			return $nav_menu;
+		}
+
+		return static::get_most_recently_created_nav_menu( $classic_nav_menus );
+	}
+
+
+	/**
+	 * Sorts the classic menus and returns the most recently created one.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @param WP_Term[] $classic_nav_menus Array of classic nav menu term objects.
+	 * @return WP_Term The most recently created classic nav menu.
+	 */
+	private static function get_most_recently_created_nav_menu( $classic_nav_menus ) {
+		usort(
+			$classic_nav_menus,
+			static function ( $a, $b ) {
+				return $b->term_id - $a->term_id;
+			}
+		);
+
+		return $classic_nav_menus[0];
+	}
+
+	/**
+	 * Returns the classic menu with the slug `primary` if it exists.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @param WP_Term[] $classic_nav_menus Array of classic nav menu term objects.
+	 * @return WP_Term|null The classic nav menu with the slug `primary` or null.
+	 */
+	private static function get_nav_menu_with_primary_slug( $classic_nav_menus ) {
+		foreach ( $classic_nav_menus as $classic_nav_menu ) {
+			if ( 'primary' === $classic_nav_menu->slug ) {
+				return $classic_nav_menu;
+			}
+		}
+
+		return null;
+	}
+
+
+	/**
+	 * Gets the classic menu assigned to the `primary` navigation menu location
+	 * if it exists.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @return WP_Term|null The classic nav menu assigned to the `primary` location or null.
+	 */
+	private static function get_nav_menu_at_primary_location() {
+		$locations = get_nav_menu_locations();
+
+		if ( isset( $locations['primary'] ) ) {
+			$primary_menu = wp_get_nav_menu_object( $locations['primary'] );
+
+			if ( $primary_menu ) {
+				return $primary_menu;
+			}
+		}
+
+		return null;
+	}
+
+	/**
+	 * Creates a default Navigation Block Menu fallback.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @return int|WP_Error The post ID of the default fallback menu or a WP_Error object.
+	 */
+	private static function create_default_fallback() {
+
+		$default_blocks = static::get_default_fallback_blocks();
+
+		// Create a new navigation menu from the fallback blocks.
+		$default_fallback = wp_insert_post(
+			array(
+				'post_content' => $default_blocks,
+				'post_title'   => _x( 'Navigation', 'Title of a Navigation menu' ),
+				'post_name'    => 'navigation',
+				'post_status'  => 'publish',
+				'post_type'    => 'wp_navigation',
+			),
+			true // So that we can check whether the result is an error.
+		);
+
+		return $default_fallback;
+	}
+
+	/**
+	 * Gets the rendered markup for the default fallback blocks.
+	 *
+	 * @since 6.3.0
+	 *
+	 * @return string default blocks markup to use a the fallback.
+	 */
+	private static function get_default_fallback_blocks() {
+		$registry = WP_Block_Type_Registry::get_instance();
+
+		// If `core/page-list` is not registered then use empty blocks.
+		return $registry->is_registered( 'core/page-list' ) ? '<!-- wp:page-list /-->' : '';
+	}
+}
-- 
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