Apply meta tag referrer policy for preloaded requests

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 3135 matching lines @@
 
 void Document::updateViewportDescription()
 {
     if (frame() && frame()->isMainFrame()) {
         frameHost()->chromeClient().dispatchViewportPropertiesDidChange(m_viewportDescription);
     }
 }
 
 void Document::processReferrerPolicy(const String& policy)
 {
-    ASSERT(!policy.isNull());
+    ReferrerPolicy referrerPolicy;
+    if (!SecurityPolicy::referrerPolicyFromString(policy, &referrerPolicy)) {
+        addConsoleMessage(ConsoleMessage::create(RenderingMessageSource, ErrorMessageLevel, "Failed to set referrer policy: The value '" + policy + "' is not one of 'always', 'default', 'never', 'no-referrer', 'no-referrer-when-downgrade', 'origin', 'origin-when-crossorigin', or 'unsafe-url'. This document's referrer policy has been left unchanged."));
+        return;
+    }
 
-    if (equalIgnoringCase(policy, "no-referrer") || equalIgnoringCase(policy, "never"))
-        setReferrerPolicy(ReferrerPolicyNever);
-    else if (equalIgnoringCase(policy, "unsafe-url") || equalIgnoringCase(policy, "always"))
-        setReferrerPolicy(ReferrerPolicyAlways);
-    else if (equalIgnoringCase(policy, "origin"))
-        setReferrerPolicy(ReferrerPolicyOrigin);
-    else if (equalIgnoringCase(policy, "origin-when-cross-origin") || equalIgnoringCase(policy, "origin-when-crossorigin"))
-        setReferrerPolicy(ReferrerPolicyOriginWhenCrossOrigin);
-    else if (equalIgnoringCase(policy, "no-referrer-when-downgrade") || equalIgnoringCase(policy, "default"))
-        setReferrerPolicy(ReferrerPolicyNoReferrerWhenDowngrade);
-    else
-        addConsoleMessage(ConsoleMessage::create(RenderingMessageSource, ErrorMessageLevel, "Failed to set referrer policy: The value '" + policy + "' is not one of 'always', 'default', 'never', 'no-referrer', 'no-referrer-when-downgrade', 'origin', 'origin-when-crossorigin', or 'unsafe-url'. This document's referrer policy has been left unchanged."));
+    setReferrerPolicy(referrerPolicy);
 }
 
 String Document::outgoingReferrer()
 {
     // See http://www.whatwg.org/specs/web-apps/current-work/#fetching-resources
     // for why we walk the parent chain for srcdoc documents.
     Document* referrerDocument = this;
     if (LocalFrame* frame = m_frame) {
         while (frame->document()->isSrcdocDocument()) {
             // Srcdoc documents must be local within the containing frame.
@@ skipping 2629 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif