From 4a9840e271eb6f4c713e6a4991571db390ea3d2b Mon Sep 17 00:00:00 2001
From: YuviPanda <yuvipanda@gmail.com>
Date: Tue, 20 Jan 2015 15:41:41 -0800
Subject: [PATCH] Add option to output referrer policy meta tag

Bug: T87276
Change-Id: I9ea4797c4d292cd4565f47b88e605b4e7afdb1d1
---
 includes/DefaultSettings.php | 10 ++++++++++
 includes/OutputPage.php      |  7 +++++++
 2 files changed, 17 insertions(+)

diff --git a/includes/DefaultSettings.php b/includes/DefaultSettings.php
index ee462d84ad..66f695c8d3 100644
--- a/includes/DefaultSettings.php
+++ b/includes/DefaultSettings.php
@@ -270,6 +270,16 @@ $wgFavicon = '/favicon.ico';
  */
 $wgAppleTouchIcon = false;
 
+/**
+ * Value for the referrer policy meta tag.
+ * One of 'never', 'default', 'origin', 'always'. Setting it to false just
+ * prevents the meta tag from being output.
+ * See http://www.w3.org/TR/referrer-policy/ for details.
+ *
+ * @since 1.25
+ */
+$wgReferrerPolicy = false;
+
 /**
  * The local filesystem path to a temporary directory. This is not required to
  * be web accessible.
diff --git a/includes/OutputPage.php b/includes/OutputPage.php
index a10946a4d1..4101d099f3 100644
--- a/includes/OutputPage.php
+++ b/includes/OutputPage.php
@@ -3284,6 +3284,13 @@ class OutputPage extends ContextSource {
 			'content' => "MediaWiki $wgVersion",
 		) );
 
+		if ( $config->get( 'ReferrerPolicy' ) !== false ) {
+			$tags['meta-referrer'] = Html::element( 'meta', array(
+				'name' => 'referrer',
+				'content' => $config->get( 'ReferrerPolicy' )
+			) );
+		}
+
 		$p = "{$this->mIndexPolicy},{$this->mFollowPolicy}";
 		if ( $p !== 'index,follow' ) {
 			// http://www.robotstxt.org/wc/meta-user.html
-- 
2.20.1