From 6296427dd743ead4c57b613d277033e9f9d321e2 Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Mon, 24 May 2021 19:23:05 +0000
Subject: [PATCH] Site Health: Make sure the `submit_button()` function is
 available in `request_filesystem_credentials()`.

This avoids a fatal error when the function is called via REST API from `WP_Site_Health_Auto_Updates::test_check_wp_filesystem_method()`.

Props lakrisgubben, mukesh27, Clorith, SergeyBiryukov.
Fixes #53206.

git-svn-id: https://develop.svn.wordpress.org/trunk@50979 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-admin/includes/class-wp-site-health-auto-updates.php | 4 ++--
 src/wp-admin/includes/file.php                              | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/wp-admin/includes/class-wp-site-health-auto-updates.php b/src/wp-admin/includes/class-wp-site-health-auto-updates.php
index 1ddaa05feb..d1c133524d 100644
--- a/src/wp-admin/includes/class-wp-site-health-auto-updates.php
+++ b/src/wp-admin/includes/class-wp-site-health-auto-updates.php
@@ -273,7 +273,7 @@ class WP_Site_Health_Auto_Updates {
 	 * @return array The test results.
 	 */
 	function test_check_wp_filesystem_method() {
-		// Make sure the `request_filesystem_credentials` function is available during our REST call.
+		// Make sure the `request_filesystem_credentials()` function is available during our REST API call.
 		if ( ! function_exists( 'request_filesystem_credentials' ) ) {
 			require_once ABSPATH . '/wp-admin/includes/file.php';
 		}
@@ -324,7 +324,7 @@ class WP_Site_Health_Auto_Updates {
 			return false;
 		}
 
-		// Make sure the `get_core_checksums` function is available during our REST call.
+		// Make sure the `get_core_checksums()` function is available during our REST API call.
 		if ( ! function_exists( 'get_core_checksums' ) ) {
 			require_once ABSPATH . '/wp-admin/includes/update.php';
 		}
diff --git a/src/wp-admin/includes/file.php b/src/wp-admin/includes/file.php
index 97cef303c1..98e0f4962c 100644
--- a/src/wp-admin/includes/file.php
+++ b/src/wp-admin/includes/file.php
@@ -2369,6 +2369,12 @@ function request_filesystem_credentials( $form_post, $type = '', $error = false,
 			echo '<input type="hidden" name="' . esc_attr( $field ) . '" value="' . esc_attr( $submitted_form[ $field ] ) . '" />';
 		}
 	}
+
+	// Make sure the `submit_button()` function is available during the REST API call
+	// from WP_Site_Health_Auto_Updates::test_check_wp_filesystem_method().
+	if ( ! function_exists( 'submit_button' ) ) {
+		require_once ABSPATH . '/wp-admin/includes/template.php';
+	}
 	?>
 	<p class="request-filesystem-credentials-action-buttons">
 		<?php wp_nonce_field( 'filesystem-credentials', '_fs_nonce', false, true ); ?>