From c09bd5568c42db209476ddd205592716b182e62a Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Thu, 27 Jul 2023 16:08:14 +0200
Subject: [PATCH] Tweak the `useWorkerFetch` default value checks (PR 15879
 follow-up)

Currently we accidentally accept `cMapUrl` and `standardFontDataUrl` parameters that are empty strings or `null`, since e.g. `new URL(null, document.baseURI)` doesn't throw, when validating the `useWorkerFetch` parameter via the `isValidFetchUrl` helper function.
Please note that we are currently failing gracefully in this case, as intended, however the warning-messages printed in the console are perhaps less helpful without this patch.
---
 src/display/api.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/display/api.js b/src/display/api.js
index 8ce1cfb36..7fc56fcd9 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -316,6 +316,8 @@ function getDocument(src) {
       : (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
         (CMapReaderFactory === DOMCMapReaderFactory &&
           StandardFontDataFactory === DOMStandardFontDataFactory &&
+          cMapUrl &&
+          standardFontDataUrl &&
           isValidFetchUrl(cMapUrl, document.baseURI) &&
           isValidFetchUrl(standardFontDataUrl, document.baseURI));
   const canvasFactory =