Implement referrerpolicy attribute for img elements

Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 33 matching lines @@
 #include "core/html/parser/HTMLSrcsetParser.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/LayoutImage.h"
 #include "core/page/Page.h"
 #include "core/style/ContentData.h"
 #include "platform/ContentType.h"
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/RuntimeEnabledFeatures.h"
+#include "platform/weborigin/SecurityPolicy.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 class HTMLImageElement::ViewportChangeListener final : public MediaQueryListListener {
 public:
     static RefPtrWillBeRawPtr<ViewportChangeListener> create(HTMLImageElement* element)
     {
         return adoptRefWillBeNoop(new ViewportChangeListener(element));
@@ skipping 20 matching lines @@
 
 HTMLImageElement::HTMLImageElement(Document& document, HTMLFormElement* form, bool createdByParser)
     : HTMLElement(imgTag, document)
     , m_imageLoader(HTMLImageLoader::create(this))
     , m_imageDevicePixelRatio(1.0f)
     , m_formWasSetByParser(false)
     , m_elementCreatedByParser(createdByParser)
     , m_intrinsicSizingViewportDependant(false)
     , m_useFallbackContent(false)
     , m_isFallbackImage(false)
+    , m_referrerPolicy(ReferrerPolicyDefault)
 {
     setHasCustomStyleCallbacks();
     if (form && form->inDocument()) {
 #if ENABLE(OILPAN)
         m_form = form;
 #else
         m_form = form->createWeakPtr();
 #endif
         m_formWasSetByParser = true;
         m_form->associate(*this);
@@ skipping 157 matching lines @@
         if (userAgentShadowRoot()) {
             Element* text = userAgentShadowRoot()->getElementById("alttext");
             String value = altText();
             if (text && text->textContent() != value)
                 text->setTextContent(altText());
         }
     } else if (name == srcAttr || name == srcsetAttr || name == sizesAttr) {
         selectSourceURL(ImageLoader::UpdateIgnorePreviousError);
     } else if (name == usemapAttr) {
         setIsLink(!value.isNull());
+    } else if (name == referrerpolicyAttr) {
+        ReferrerPolicy parsedPolicy;
+        if (value.isNull() || !SecurityPolicy::referrerPolicyFromString(value, &parsedPolicy)) {
+            m_referrerPolicy = ReferrerPolicyDefault;
+        } else {
+            m_referrerPolicy = parsedPolicy;
+        }

[Yoav Weiss, 2015/08/18 21:09:21]

We could replace the if{}else{} here similarly to my comment in
HTMLPreloadScanner

[estark, 2015/08/19 02:53:22]

Done.

     } else {
         HTMLElement::parseAttribute(name, value);
     }
 }
 
 String HTMLImageElement::altText() const
 {
     // lets figure out the alt text.. magic stuff
     // http://www.w3.org/TR/1998/REC-html40-19980424/appendix/notes.html#altgen
     // also heavily discussed by Hixie on bugzilla
@@ skipping 97 matching lines @@
         ImageCandidate candidate = findBestFitImageFromPictureParent();
         if (!candidate.isEmpty()) {
             setBestFitURLAndDPRFromImageCandidate(candidate);
             imageWasModified = true;
         }
     }
 
     // If we have been inserted from a layoutObject-less document,
     // our loader may have not fetched the image, so do it now.
     if ((insertionPoint->inDocument() && !imageLoader().image()) || imageWasModified)
-        imageLoader().updateFromElement(ImageLoader::UpdateNormal);
+        imageLoader().updateFromElement(ImageLoader::UpdateNormal, m_referrerPolicy);
 
     return HTMLElement::insertedInto(insertionPoint);
 }
 
 void HTMLImageElement::removedFrom(ContainerNode* insertionPoint)
 {
     if (!m_form || NodeTraversal::highestAncestorOrSelf(*m_form.get()) != NodeTraversal::highestAncestorOrSelf(*this))
         resetFormOwner();
     if (m_listener)
         document().mediaQueryMatcher().removeViewportListener(m_listener);
@@ skipping 254 matching lines @@
 {
     float value;
     // We don't care here if the sizes attribute exists, so we ignore the return value.
     // If it doesn't exist, we just return the default.
     sourceSizeValue(element, document(), value);
     return value;
 }
 
 void HTMLImageElement::forceReload() const
 {
-    imageLoader().updateFromElement(ImageLoader::UpdateForcedReload);
+    imageLoader().updateFromElement(ImageLoader::UpdateForcedReload, m_referrerPolicy);
 }
 
 void HTMLImageElement::selectSourceURL(ImageLoader::UpdateFromElementBehavior behavior)
 {
     if (!document().isActive())
         return;
 
     bool foundURL = false;
     ImageCandidate candidate = findBestFitImageFromPictureParent();
     if (!candidate.isEmpty()) {
         setBestFitURLAndDPRFromImageCandidate(candidate);
         foundURL = true;
     }
 
     if (!foundURL) {
         candidate = bestFitSourceForImageAttributes(document().devicePixelRatio(), sourceSize(*this), fastGetAttribute(srcAttr), fastGetAttribute(srcsetAttr), &document());
         setBestFitURLAndDPRFromImageCandidate(candidate);
     }
     if (m_intrinsicSizingViewportDependant && !m_listener) {
         m_listener = ViewportChangeListener::create(this);
         document().mediaQueryMatcher().addViewportListener(m_listener);
     }
-    imageLoader().updateFromElement(behavior);
+    imageLoader().updateFromElement(behavior, m_referrerPolicy);
 
     if (imageLoader().image() || (imageLoader().hasPendingActivity() && !imageSourceURL().isEmpty()))
         ensurePrimaryContent();
     else
         ensureFallbackContent();
 }
 
 const KURL& HTMLImageElement::sourceURL() const
 {
     return cachedImage()->response().url();
@@ skipping 56 matching lines @@
     ensureUserAgentShadowRoot();
 }
 
 bool HTMLImageElement::isOpaque() const
 {
     Image* image = const_cast<HTMLImageElement*>(this)->imageContents();
     return image && image->currentFrameKnownToBeOpaque();
 }
 
 }