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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/imports/HTMLImport.h"
     33 #include "core/rendering/RenderObject.h"
     34 #include "public/platform/Platform.h"
     35 
     36 namespace blink {
     37 
     38 bool PreloadRequest::isSafeToSendToAnotherThread() const
     39 {
     40     return m_initiatorName.isSafeToSendToAnotherThread()
     41         && m_charset.isSafeToSendToAnotherThread()
     42         && m_resourceURL.isSafeToSendToAnotherThread()
     43         && m_baseURL.isSafeToSendToAnotherThread();
     44 }
     45 
     46 KURL PreloadRequest::completeURL(Document* document)
     47 {
     48     return document->completeURLWithOverride(m_resourceURL, m_baseURL.isEmpty() ? document->url() : m_baseURL);
     49 }
     50 
     51 FetchRequest PreloadRequest::resourceRequest(Document* document)
     52 {
     53     ASSERT(isMainThread());
     54     FetchInitiatorInfo initiatorInfo;
     55     initiatorInfo.name = AtomicString(m_initiatorName);
     56     initiatorInfo.position = m_initiatorPosition;
     57     FetchRequest request(ResourceRequest(completeURL(document)), initiatorInfo);
     58 
     59     if (m_isCORSEnabled)
     60         request.setCrossOriginAccessControl(document->securityOrigin(), m_allowCredentials);
     61     return request;
     62 }
     63 
     64 inline HTMLResourcePreloader::HTMLResourcePreloader(Document& document)
     65     : m_document(document)
     66 {
     67 }
     68 
     69 PassOwnPtrWillBeRawPtr<HTMLResourcePreloader> HTMLResourcePreloader::create(Document& document)
     70 {
     71     return adoptPtrWillBeNoop(new HTMLResourcePreloader(document));
     72 }
     73 
     74 void HTMLResourcePreloader::trace(Visitor* visitor)
     75 {
     76     visitor->trace(m_document);
     77 }
     78 
     79 void HTMLResourcePreloader::takeAndPreload(PreloadRequestStream& r)
     80 {
     81     PreloadRequestStream requests;
     82     requests.swap(r);
     83 
     84     for (PreloadRequestStream::iterator it = requests.begin(); it != requests.end(); ++it)
     85         preload(it->release());
     86 }
     87 
     88 void HTMLResourcePreloader::preload(PassOwnPtr<PreloadRequest> preload)
     89 {
     90     FetchRequest request = preload->resourceRequest(m_document);
     91     request.setDefer(preload->defer());
     92     blink::Platform::current()->histogramCustomCounts("WebCore.PreloadDelayMs", static_cast<int>(1000 * (monotonicallyIncreasingTime() - preload->discoveryTime())), 0, 2000, 20);
     93     m_document->fetcher()->preload(preload->resourceType(), request, preload->charset());
     94 }
     95 
     96 }
     97