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      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/html/HTMLImport.h"
     33 #include "core/css/MediaList.h"
     34 #include "core/css/MediaQueryEvaluator.h"
     35 #include "core/rendering/RenderObject.h"
     36 #include "public/platform/Platform.h"
     37 
     38 namespace WebCore {
     39 
     40 bool PreloadRequest::isSafeToSendToAnotherThread() const
     41 {
     42     return m_initiatorName.isSafeToSendToAnotherThread()
     43         && m_charset.isSafeToSendToAnotherThread()
     44         && m_resourceURL.isSafeToSendToAnotherThread()
     45         && m_mediaAttribute.isSafeToSendToAnotherThread()
     46         && m_baseURL.isSafeToSendToAnotherThread();
     47 }
     48 
     49 KURL PreloadRequest::completeURL(Document* document)
     50 {
     51     return document->completeURL(m_resourceURL, m_baseURL.isEmpty() ? document->url() : m_baseURL);
     52 }
     53 
     54 FetchRequest PreloadRequest::resourceRequest(Document* document)
     55 {
     56     ASSERT(isMainThread());
     57     FetchInitiatorInfo initiatorInfo;
     58     initiatorInfo.name = m_initiatorName;
     59     initiatorInfo.position = m_initiatorPosition;
     60     FetchRequest request(ResourceRequest(completeURL(document)), initiatorInfo);
     61 
     62     if (m_isCORSEnabled)
     63         request.setCrossOriginAccessControl(document->securityOrigin(), m_allowCredentials);
     64     return request;
     65 }
     66 
     67 void HTMLResourcePreloader::takeAndPreload(PreloadRequestStream& r)
     68 {
     69     PreloadRequestStream requests;
     70     requests.swap(r);
     71 
     72     for (PreloadRequestStream::iterator it = requests.begin(); it != requests.end(); ++it)
     73         preload(it->release());
     74 }
     75 
     76 static bool mediaAttributeMatches(Frame* frame, RenderStyle* renderStyle, const String& attributeValue)
     77 {
     78     RefPtr<MediaQuerySet> mediaQueries = MediaQuerySet::create(attributeValue);
     79     MediaQueryEvaluator mediaQueryEvaluator("screen", frame, renderStyle);
     80     return mediaQueryEvaluator.eval(mediaQueries.get());
     81 }
     82 
     83 void HTMLResourcePreloader::preload(PassOwnPtr<PreloadRequest> preload)
     84 {
     85     Document* executingDocument = m_document->import() ? m_document->import()->master() : m_document;
     86     Document* loadingDocument = m_document;
     87 
     88     ASSERT(executingDocument->frame());
     89     ASSERT(executingDocument->renderer());
     90     ASSERT(executingDocument->renderer()->style());
     91     if (!preload->media().isEmpty() && !mediaAttributeMatches(executingDocument->frame(), executingDocument->renderer()->style(), preload->media()))
     92         return;
     93 
     94     FetchRequest request = preload->resourceRequest(m_document);
     95     blink::Platform::current()->histogramCustomCounts("WebCore.PreloadDelayMs", static_cast<int>(1000 * (monotonicallyIncreasingTime() - preload->discoveryTime())), 0, 2000, 20);
     96     loadingDocument->fetcher()->preload(preload->resourceType(), request, preload->charset());
     97 }
     98 
     99 
    100 }
    101