From a69eac16aa3b780c129a2be90b8e31924d47cb12 Mon Sep 17 00:00:00 2001
From: Ori Livneh <ori@wikimedia.org>
Date: Wed, 7 Oct 2015 23:04:59 -0700
Subject: [PATCH] Small clean-ups for OutputPage::userCanPreview

Change-Id: Ibd973750b60cbcc8d1289686de6cabcfdca5c5d9
---
 includes/OutputPage.php | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/includes/OutputPage.php b/includes/OutputPage.php
index f48497fd8b..d85c60c3f6 100644
--- a/includes/OutputPage.php
+++ b/includes/OutputPage.php
@@ -3312,22 +3312,31 @@ class OutputPage extends ContextSource {
 	 * @return bool
 	 */
 	public function userCanPreview() {
-		if ( $this->getRequest()->getVal( 'action' ) != 'submit'
-			|| !$this->getRequest()->wasPosted()
-			|| !$this->getUser()->matchEditToken(
-				$this->getRequest()->getVal( 'wpEditToken' ) )
-		) {
+		$request = $this->getRequest();
+		if ( $request->getVal( 'action' ) !== 'submit' || !$request->wasPosted() ) {
+			return false;
+		}
+
+		$user = $this->getUser();
+		if ( !$user->matchEditToken( $request->getVal( 'wpEditToken' ) ) ) {
 			return false;
 		}
-		if ( !$this->getTitle()->isJsSubpage() && !$this->getTitle()->isCssSubpage() ) {
+
+		$title = $this->getTitle();
+		if ( !$title->isJsSubpage() && !$title->isCssSubpage() ) {
 			return false;
 		}
-		if ( !$this->getTitle()->isSubpageOf( $this->getUser()->getUserPage() ) ) {
+		if ( !$title->isSubpageOf( $user->getUserPage() ) ) {
 			// Don't execute another user's CSS or JS on preview (T85855)
 			return false;
 		}
 
-		return !count( $this->getTitle()->getUserPermissionsErrors( 'edit', $this->getUser() ) );
+		$errors = $title->getUserPermissionsErrors( 'edit', $user );
+		if ( count( $errors ) !== 0 ) {
+			return false;
+		}
+
+		return true;
 	}
 
 	/**
-- 
2.20.1