Privacy: Introduce Privacy Policy page helpers:

* `is_privacy_policy()` template tag
* `privacy-policy.php` template
* `.privacy-policy` body class
* `.menu-item-privacy-policy` menu item class

Props garrett-eclipse, birgire, xkon, Clorith.
Fixes #44005.
Built from https://develop.svn.wordpress.org/trunk@44966


git-svn-id: http://core.svn.wordpress.org/trunk@44797 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/file.php

@@ -36,6 +36,7 @@ $wp_file_descriptions = array(
 	'single.php'            => __( 'Single Post' ),
 	'page.php'              => __( 'Single Page' ),
 	'front-page.php'        => __( 'Homepage' ),
+	'privacy-policy.php'    => __( 'Privacy Policy Page' ),
 	// Attachments
 	'attachment.php'        => __( 'Attachment Template' ),
 	'image.php'             => __( 'Image Attachment Template' ),

wp-includes/class-wp-query.php

@@ -325,6 +325,14 @@ class WP_Query {
 	 */
 	public $is_home = false;
 
+	/**
+	 * Signifies whether the current query is for the Privacy Policy page.
+	 *
+	 * @since 5.2.0
+	 * @var bool
+	 */
+	public $is_privacy_policy = false;
+
 	/**
 	 * Signifies whether the current query couldn't find anything.
 	 *
@@ -463,6 +471,7 @@ class WP_Query {
 		$this->is_comment_feed      = false;
 		$this->is_trackback         = false;
 		$this->is_home              = false;
+		$this->is_privacy_policy    = false;
 		$this->is_404               = false;
 		$this->is_paged             = false;
 		$this->is_admin             = false;
@@ -998,6 +1007,10 @@ class WP_Query {
 				$this->is_home       = true;
 				$this->is_posts_page = true;
 			}
+
+			if ( isset( $this->queried_object_id ) && $this->queried_object_id == get_option( 'wp_page_for_privacy_policy' ) ) {
+				$this->is_privacy_policy = true;
+			}
 		}
 
 		if ( $qv['page_id'] ) {
@@ -1006,6 +1019,10 @@ class WP_Query {
 				$this->is_home       = true;
 				$this->is_posts_page = true;
 			}
+
+			if ( $qv['page_id'] == get_option( 'wp_page_for_privacy_policy' ) ) {
+				$this->is_privacy_policy = true;
+			}
 		}
 
 		if ( ! empty( $qv['post_type'] ) ) {
@@ -3877,6 +3894,27 @@ class WP_Query {
 		return (bool) $this->is_home;
 	}
 
+	/**
+	 * Is the query for the Privacy Policy page?
+	 *
+	 * This is the page which shows the Privacy Policy content of your site.
+	 *
+	 * Depends on the site's "Change your Privacy Policy page" Privacy Settings 'wp_page_for_privacy_policy'.
+	 *
+	 * This function will return true only on the page you set as the "Privacy Policy page".
+	 *
+	 * @since 5.2.0
+	 *
+	 * @return bool True, if Privacy Policy page.
+	 */
+	public function is_privacy_policy() {
+		if ( get_option( 'wp_page_for_privacy_policy' ) && $this->is_page( get_option( 'wp_page_for_privacy_policy' ) ) ) {
+			return true;
+		} else {
+			return false;
+		}
+	}
+
 	/**
 	 * Is the query for an existing month archive?
 	 *

wp-includes/nav-menu-template.php

@@ -363,6 +363,7 @@ function _wp_menu_item_classes_by_context( &$menu_items ) {
 
 	$front_page_url         = home_url();
 	$front_page_id          = (int) get_option( 'page_on_front' );
+	$privacy_policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );
 
 	foreach ( (array) $menu_items as $key => $menu_item ) {
 
@@ -378,6 +379,11 @@ function _wp_menu_item_classes_by_context( &$menu_items ) {
 			$classes[] = 'menu-item-home';
 		}
 
+		// This menu item is set as the 'Privacy Policy Page'.
+		if ( 'post_type' === $menu_item->type && $privacy_policy_page_id === (int) $menu_item->object_id ) {
+			$classes[] = 'menu-item-privacy-policy';
+		}
+
 		// if the menu item corresponds to a taxonomy term for the currently-queried non-hierarchical post object
 		if ( $wp_query->is_singular && 'taxonomy' == $menu_item->type && in_array( $menu_item->object_id, $possible_object_parents ) ) {
 			$active_parent_object_ids[] = (int) $menu_item->object_id;

wp-includes/post-template.php

@@ -621,6 +621,9 @@ function get_body_class( $class = '' ) {
 	if ( is_home() ) {
 		$classes[] = 'blog';
 	}
+	if ( is_privacy_policy() ) {
+		$classes[] = 'privacy-policy';
+	}
 	if ( is_archive() ) {
 		$classes[] = 'archive';
 	}

wp-includes/query.php

@@ -489,6 +489,36 @@ function is_home() {
 	return $wp_query->is_home();
 }
 
+/**
+ * Determines whether the query is for the Privacy Policy page.
+ *
+ * The Privacy Policy page is the page that shows the Privacy Policy content of the site.
+ *
+ * is_privacy_policy() is dependent on the site's "Change your Privacy Policy page" Privacy Settings 'wp_page_for_privacy_policy'.
+ *
+ * This function will return true only on the page you set as the "Privacy Policy page".
+ *
+ * For more information on this and similar theme functions, check out
+ * the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
+ * Conditional Tags} article in the Theme Developer Handbook.
+ *
+ * @since 5.2.0
+ *
+ * @global WP_Query $wp_query Global WP_Query instance.
+ *
+ * @return bool
+ */
+function is_privacy_policy() {
+	global $wp_query;
+
+	if ( ! isset( $wp_query ) ) {
+		_doing_it_wrong( __FUNCTION__, __( 'Conditional query tags do not work before the query is run. Before then, they always return false.' ), '3.1.0' );
+		return false;
+	}
+
+	return $wp_query->is_privacy_policy();
+}
+
 /**
  * Determines whether the query is for an existing month archive.
  *

wp-includes/template-loader.php

@@ -51,6 +51,7 @@ if ( wp_using_themes() ) :
 	elseif ( is_search() && $template = get_search_template() ) :
 	elseif ( is_front_page() && $template = get_front_page_template() ) :
 	elseif ( is_home() && $template = get_home_template() ) :
+	elseif ( is_privacy_policy() && $template = get_privacy_policy_template() ) :
 	elseif ( is_post_type_archive() && $template = get_post_type_archive_template() ) :
 	elseif ( is_tax() && $template = get_taxonomy_template() ) :
 	elseif ( is_attachment() && $template = get_attachment_template() ) :

wp-includes/template.php

@@ -33,7 +33,7 @@ function get_query_template( $type, $templates = array() ) {
 	 * The last element in the array should always be the fallback template for this query type.
 	 *
 	 * Possible values for `$type` include: 'index', '404', 'archive', 'author', 'category', 'tag', 'taxonomy', 'date',
-	 * 'embed', 'home', 'frontpage', 'page', 'paged', 'search', 'single', 'singular', and 'attachment'.
+	 * 'embed', 'home', 'frontpage', 'privacypolicy', 'page', 'paged', 'search', 'single', 'singular', and 'attachment'.
 	 *
 	 * @since 4.7.0
 	 *
@@ -51,7 +51,7 @@ function get_query_template( $type, $templates = array() ) {
 	 * This hook also applies to various types of files loaded as part of the Template Hierarchy.
 	 *
 	 * Possible values for `$type` include: 'index', '404', 'archive', 'author', 'category', 'tag', 'taxonomy', 'date',
-	 * 'embed', 'home', 'frontpage', 'page', 'paged', 'search', 'single', 'singular', and 'attachment'.
+	 * 'embed', 'home', 'frontpage', 'privacypolicy', 'page', 'paged', 'search', 'single', 'singular', and 'attachment'.
 	 *
 	 * @since 1.5.0
 	 * @since 4.8.0 The `$type` and `$templates` parameters were added.
@@ -376,6 +376,24 @@ function get_front_page_template() {
 	return get_query_template( 'front_page', $templates );
 }
 
+/**
+ * Retrieve path of Privacy Policy page template in current or parent template.
+ *
+ * The template hierarchy and template path are filterable via the {@see '$type_template_hierarchy'}
+ * and {@see '$type_template'} dynamic hooks, where `$type` is 'privacypolicy'.
+ *
+ * @since 5.2.0
+ *
+ * @see get_query_template()
+ *
+ * @return string Full path to front page template file.
+ */
+function get_privacy_policy_template() {
+	$templates = array( 'privacy-policy.php' );
+
+	return get_query_template( 'privacy_policy', $templates );
+}
+
 /**
  * Retrieve path of page template in current or parent template.
  *

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.2-alpha-44965';
+$wp_version = '5.2-alpha-44966';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.