third_party/WebKit/Source/core/html/parser/HTMLResourcePreloader.cpp

   1 /*
   2  * Copyright (C) 2013 Google Inc. All Rights Reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "core/html/parser/HTMLResourcePreloader.h"
  28
  29 #include "core/dom/Document.h"
  30 #include "core/fetch/FetchInitiatorInfo.h"
  31 #include "core/fetch/ResourceFetcher.h"
  32 #include "core/loader/DocumentLoader.h"
  33 #include "public/platform/Platform.h"
  34
  35 namespace blink {
  36
  37 inline HTMLResourcePreloader::HTMLResourcePreloader(Document& document)
  38     : m_document(document)
  39 {
  40 }
  41
  42 PassOwnPtrWillBeRawPtr<HTMLResourcePreloader> HTMLResourcePreloader::create(Document& document)
  43 {
  44     return adoptPtrWillBeNoop(new HTMLResourcePreloader(document));
  45 }
  46
  47 DEFINE_TRACE(HTMLResourcePreloader)
  48 {
  49     visitor->trace(m_document);
  50 }
  51
  52 static void preconnectHost(PreloadRequest* request, const NetworkHintsInterface& networkHintsInterface)
  53 {
  54     ASSERT(request);
  55     ASSERT(request->isPreconnect());
  56     KURL host(request->baseURL(), request->resourceURL());
  57     if (!host.isValid() || !host.protocolIsInHTTPFamily())
  58         return;
  59     CrossOriginAttributeValue crossOrigin = CrossOriginAttributeNotSet;
  60     if (request->isCORS()) {
  61         if (request->isAllowCredentials())
  62             crossOrigin = CrossOriginAttributeUseCredentials;
  63         else
  64             crossOrigin = CrossOriginAttributeAnonymous;
  65     }
  66     networkHintsInterface.preconnectHost(host, crossOrigin);
  67 }
  68
  69 void HTMLResourcePreloader::preload(PassOwnPtr<PreloadRequest> preload, const NetworkHintsInterface& networkHintsInterface)
  70 {
  71     if (preload->isPreconnect()) {
  72         preconnectHost(preload.get(), networkHintsInterface);
  73         return;
  74     }
  75     // TODO(yoichio): Should preload if document is imported.
  76     if (!m_document->loader())
  77         return;
  78     FetchRequest request = preload->resourceRequest(m_document);
  79     // TODO(dgozman): This check should go to HTMLPreloadScanner, but this requires
  80     // making Document::completeURLWithOverride logic to be statically accessible.
  81     if (request.url().protocolIsData())
  82         return;
  83     if (preload->resourceType() == Resource::Script || preload->resourceType() == Resource::CSSStyleSheet || preload->resourceType() == Resource::ImportResource)
  84         request.setCharset(preload->charset().isEmpty() ? m_document->charset().string() : preload->charset());
  85     request.setForPreload(true);
  86     Platform::current()->histogramCustomCounts("WebCore.PreloadDelayMs", static_cast<int>(1000 * (monotonicallyIncreasingTime() - preload->discoveryTime())), 0, 2000, 20);
  87     m_document->loader()->startPreload(preload->resourceType(), request);
  88 }
  89
  90 } // namespace blink