From 352389c0c6500cac49c29f8b573379429f718315 Mon Sep 17 00:00:00 2001
From: Rob Wu <rob@robwu.nl>
Date: Tue, 6 Feb 2018 15:06:02 +0100
Subject: [PATCH] [CRX] Expose some headers to fetch requests
---
extensions/chromium/preserve-referer.js | 27 +++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/extensions/chromium/preserve-referer.js b/extensions/chromium/preserve-referer.js
index 9e78bcb37..1651676e3 100644
--- a/extensions/chromium/preserve-referer.js
+++ b/extensions/chromium/preserve-referer.js
@@ -117,8 +117,17 @@ chrome.runtime.onConnect.addListener(function onReceivePort(port) {
delete g_referrers[tabId][frameId];
}
chrome.webRequest.onBeforeSendHeaders.removeListener(onBeforeSendHeaders);
+ chrome.webRequest.onHeadersReceived.removeListener(exposeOnHeadersReceived);
});
+ // Expose some response headers for fetch API calls from PDF.js;
+ // This is a work-around for https://crbug.com/784528
+ chrome.webRequest.onHeadersReceived.addListener(exposeOnHeadersReceived, {
+ urls: ['https://*/*'],
+ types: ['xmlhttprequest'],
+ tabId: tabId,
+ }, ['blocking', 'responseHeaders']);
+
function onBeforeSendHeaders(details) {
if (details.frameId !== frameId) {
return;
@@ -137,4 +146,22 @@ chrome.runtime.onConnect.addListener(function onReceivePort(port) {
refererHeader.value = referer;
return { requestHeaders: headers, };
}
+
+ function exposeOnHeadersReceived(details) {
+ if (details.frameId !== frameId) {
+ return;
+ }
+ var headers = details.responseHeaders;
+ var aceh = getHeaderFromHeaders(headers, 'access-control-expose-headers');
+ // List of headers that PDF.js uses in src/display/network_utils.js
+ var acehValue =
+ 'accept-ranges,content-encoding,content-length,content-disposition';
+ if (aceh) {
+ aceh.value += ',' + acehValue;
+ } else {
+ aceh = { name: 'Access-Control-Expose-Headers', value: acehValue, };
+ headers.push(aceh);
+ }
+ return { responseHeaders: headers, };
+ }
});