From bab0d57578812da2e666dd985cfbade79a09ee9e Mon Sep 17 00:00:00 2001
From: danielbachhuber <danielbachhuber@git.wordpress.org>
Date: Sat, 13 Oct 2018 03:49:57 +0000
Subject: [PATCH] REST API: Include `permalink_template`/`generated_slug` for
 Posts

In order for clients to present permalink previews, the REST API must share the computed results of `get_sample_permalink()`. These two values are now exposed as `permalink_template` and `generated_slug` for public, viewable post types, but only for `context=edit`.

Props danielbachhuber, rahulsprajapati.
Fixes #45017.

Built from https://develop.svn.wordpress.org/branches/5.0@43720


git-svn-id: http://core.svn.wordpress.org/branches/5.0@43549 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 .../class-wp-rest-posts-controller.php        | 32 +++++++++++++++++++
 wp-includes/version.php                       |  2 +-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index 42ceec93d8..3465271a11 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -1575,6 +1575,23 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			}
 		}
 
+		$post_type_obj = get_post_type_object( $post->post_type );
+		if ( is_post_type_viewable( $post_type_obj ) && $post_type_obj->public  ) {
+
+			if ( ! function_exists( 'get_sample_permalink' ) ) {
+				require_once ABSPATH . '/wp-admin/includes/post.php';
+			}
+
+			$sample_permalink = get_sample_permalink( $post->ID, $post->post_title, '' );
+
+			if ( in_array( 'permalink_template', $fields, true ) ) {
+				$data['permalink_template'] = $sample_permalink[0];
+			}
+			if ( in_array( 'generated_slug', $fields, true ) ) {
+				$data['generated_slug'] = $sample_permalink[1];
+			}
+		}
+
 		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
 		$data    = $this->add_additional_fields_to_object( $data, $request );
 		$data    = $this->filter_response_by_context( $data, $context );
@@ -1907,6 +1924,21 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 		);
 
 		$post_type_obj = get_post_type_object( $this->post_type );
+		if ( is_post_type_viewable( $post_type_obj ) && $post_type_obj->public ) {
+			$schema['properties']['permalink_template'] = array(
+				'description' => __( 'Permalink template for the object.' ),
+				'type'        => 'string',
+				'context'     => array( 'edit' ),
+				'readonly'    => true,
+			);
+
+			$schema['properties']['generated_slug'] = array(
+				'description' => __( 'Slug automatically generated from the object title.' ),
+				'type'        => 'string',
+				'context'     => array( 'edit' ),
+				'readonly'    => true,
+			);
+		}
 
 		if ( $post_type_obj->hierarchical ) {
 			$schema['properties']['parent'] = array(
diff --git a/wp-includes/version.php b/wp-includes/version.php
index bfc85fbc01..a1feebf9bf 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43719';
+$wp_version = '5.0-alpha-43720';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.