Add <link rel=preconnect> crossorigin attribute (take 2)

Source/core/loader/LinkLoader.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
  */
 
 #include "config.h"
 #include "core/loader/LinkLoader.h"
 
 #include "core/dom/Document.h"
 #include "core/fetch/FetchInitiatorTypeNames.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/Settings.h"
+#include "core/html/CrossOriginAttribute.h"
 #include "core/html/LinkRelAttribute.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/loader/LinkHeader.h"
 #include "core/loader/PrerenderHandle.h"
 #include "platform/Prerender.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/network/NetworkHints.h"
 #include "public/platform/WebPrerender.h"
 
 namespace blink {
@@ skipping 71 matching lines @@
         // FIXME: The href attribute of the link element can be in "//hostname" form, and we shouldn't attempt
         // to complete that as URL <https://bugs.webkit.org/show_bug.cgi?id=48857>.
         if (settings && settings->dnsPrefetchingEnabled() && href.isValid() && !href.isEmpty()) {
             if (settings->logDnsPrefetchAndPreconnect())
                 document.addConsoleMessage(ConsoleMessage::create(OtherMessageSource, DebugMessageLevel, String("DNS prefetch triggered for " + href.host())));
             prefetchDNS(href.host());
         }
     }
 }
 
-static void preconnectIfNeeded(const LinkRelAttribute& relAttribute, const KURL& href, Document& document)
+static void preconnectIfNeeded(const LinkRelAttribute& relAttribute, const KURL& href, Document& document, const CrossOriginAttributeValue crossOrigin)
 {
     if (relAttribute.isPreconnect() && href.isValid()) {
         ASSERT(RuntimeEnabledFeatures::linkPreconnectEnabled());
         Settings* settings = document.settings();
-        if (settings && settings->logDnsPrefetchAndPreconnect())
+        if (settings && settings->logDnsPrefetchAndPreconnect()) {
             document.addConsoleMessage(ConsoleMessage::create(OtherMessageSource, DebugMessageLevel, String("Preconnect triggered for " + href.host())));
-        preconnect(href);
+            if (crossOrigin != CrossOriginAttributeNotSet) {
+                document.addConsoleMessage(ConsoleMessage::create(OtherMessageSource, DebugMessageLevel,
+                    String("Preconnect CORS setting is ") + String((crossOrigin == CrossOriginAttributeAnonymous) ? "anonymous" : "use-credentials")));
+            }
+        }
+        preconnect(href, crossOrigin);
     }
 }
 
 // TODO(yoav): Replace Resource:Type here with some way that conveys priority but not context.
 static bool getTypeFromAsAttribute(const String& as, Resource::Type& type)
 {
     if (as.isEmpty())
         return false;
     // TODO(yoav): Return false also when the `as` value is not a valid one.
     // TODO(yoav): Add actual types here and make sure priorities work accordingly.
@@ skipping 29 matching lines @@
     LinkHeaderSet headerSet(headerValue);
     for (auto& header : headerSet) {
         if (!header.valid() || header.url().isEmpty() || header.rel().isEmpty())
             return false;
         LinkRelAttribute relAttribute(header.rel());
         KURL url = document->completeURL(header.url());
         if (RuntimeEnabledFeatures::linkHeaderEnabled())
             dnsPrefetchIfNeeded(relAttribute, url, *document);
 
         if (RuntimeEnabledFeatures::linkPreconnectEnabled())
-            preconnectIfNeeded(relAttribute, url, *document);
+            preconnectIfNeeded(relAttribute, url, *document, header.crossOrigin());
 
         // FIXME: Add more supported headers as needed.
     }
     return true;
 }
 
 bool LinkLoader::loadLink(const LinkRelAttribute& relAttribute, const AtomicString& crossOriginMode, const String& type, const String& as, const KURL& href, Document& document)
 {
+    // TODO(yoav): Convert all uses of the CrossOriginAttribute to CrossOriginAttributeValue. crbug.com/486689
     // FIXME(crbug.com/463266): We're ignoring type here. Maybe we shouldn't.
     dnsPrefetchIfNeeded(relAttribute, href, document);
 
-    preconnectIfNeeded(relAttribute, href, document);
+    preconnectIfNeeded(relAttribute, href, document, crossOriginAttributeValue(crossOriginMode));
 
     preloadIfNeeded(relAttribute, href, document, as);
 
     // FIXME(crbug.com/323096): Should take care of import.
     if ((relAttribute.isLinkPrefetch() || relAttribute.isLinkSubresource() || relAttribute.isTransitionExitingStylesheet()) && href.isValid() && document.frame()) {
         if (!m_client->shouldLoadLink())
             return false;
         Resource::Type type = relAttribute.isLinkSubresource() ?  Resource::LinkSubresource : Resource::LinkPrefetch;
         FetchRequest linkRequest(ResourceRequest(document.completeURL(href)), FetchInitiatorTypeNames::link);
         if (!crossOriginMode.isNull())
@@ skipping 25 matching lines @@
         m_prerender.clear();
     }
 }
 
 DEFINE_TRACE(LinkLoader)
 {
     visitor->trace(m_prerender);
 }
 
 }