From 11f3deac56a9a410488883f86b3b17a1a69534d9 Mon Sep 17 00:00:00 2001
From: Tony Jin <tjin@box.com>
Date: Wed, 16 Dec 2015 17:26:03 -0800
Subject: [PATCH] Allow link rel to be customized. Defaults to 'noreferrer'

---
 src/display/annotation_layer.js | 5 +++++
 src/display/api.js              | 8 ++++++++
 2 files changed, 13 insertions(+)

diff --git a/src/display/annotation_layer.js b/src/display/annotation_layer.js
index f140d381a..e833204d6 100644
--- a/src/display/annotation_layer.js
+++ b/src/display/annotation_layer.js
@@ -311,6 +311,11 @@ var AnnotationLayer = (function AnnotationLayerClosure() {
       link.target = LinkTargetStringMap[PDFJS.externalLinkTarget];
     }
 
+    // Strip referrer
+    if (item.url) {
+      link.rel = PDFJS.externalLinkRel;
+    }
+
     if (!item.url) {
       if (item.action) {
         bindNamedAction(link, item.action);
diff --git a/src/display/api.js b/src/display/api.js
index 1cf5c513e..c890df102 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -230,6 +230,14 @@ PDFJS.openExternalLinksInNewWindow = (
 PDFJS.externalLinkTarget = (PDFJS.externalLinkTarget === undefined ?
                             PDFJS.LinkTarget.NONE : PDFJS.externalLinkTarget);
 
+/**
+ * Specifies the |rel| attribute for external links. Defaults to stripping
+ * the referrer.
+ * @var {string}
+ */
+PDFJS.externalLinkRel = (PDFJS.externalLinkRel === undefined ?
+                         'noreferrer' : PDFJS.externalLinkRel);
+
 /**
   * Determines if we can eval strings as JS. Primarily used to improve
   * performance for font rendering.