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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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/loader/PrerenderHandle.h"
     33 
     34 #include "core/dom/Document.h"
     35 #include "core/frame/LocalFrame.h"
     36 #include "core/loader/FrameLoader.h"
     37 #include "core/loader/PrerendererClient.h"
     38 #include "platform/Prerender.h"
     39 #include "platform/weborigin/ReferrerPolicy.h"
     40 #include "platform/weborigin/SecurityPolicy.h"
     41 
     42 namespace blink {
     43 
     44 // static
     45 PassOwnPtr<PrerenderHandle> PrerenderHandle::create(Document& document, PrerenderClient* client, const KURL& url, const unsigned prerenderRelTypes)
     46 {
     47     // Prerenders are unlike requests in most ways (for instance, they pass down fragments, and they don't return data),
     48     // but they do have referrers.
     49     const ReferrerPolicy referrerPolicy = document.referrerPolicy();
     50 
     51     if (!document.frame())
     52         return PassOwnPtr<PrerenderHandle>();
     53 
     54     const String referrer = SecurityPolicy::generateReferrerHeader(referrerPolicy, url, document.outgoingReferrer());
     55 
     56     RefPtr<Prerender> prerender = Prerender::create(client, url, prerenderRelTypes, referrer, referrerPolicy);
     57 
     58     PrerendererClient* prerendererClient = PrerendererClient::from(document.page());
     59     if (prerendererClient)
     60         prerendererClient->willAddPrerender(prerender.get());
     61     prerender->add();
     62 
     63     return adoptPtr(new PrerenderHandle(document, prerender.release()));
     64 }
     65 
     66 PrerenderHandle::PrerenderHandle(Document& document, PassRefPtr<Prerender> prerender)
     67     : DocumentLifecycleObserver(&document)
     68     , m_prerender(prerender)
     69 {
     70 }
     71 
     72 PrerenderHandle::~PrerenderHandle()
     73 {
     74     if (m_prerender)
     75         detach();
     76 }
     77 
     78 void PrerenderHandle::cancel()
     79 {
     80     // Avoid both abandoning and canceling the same prerender. In the abandon case, the LinkLoader cancels the
     81     // PrerenderHandle as the Document is destroyed, even through the DocumentLifecycleObserver has already abandoned
     82     // it.
     83     if (!m_prerender)
     84         return;
     85     m_prerender->cancel();
     86     detach();
     87 }
     88 
     89 const KURL& PrerenderHandle::url() const
     90 {
     91     return m_prerender->url();
     92 }
     93 
     94 void PrerenderHandle::documentWasDetached()
     95 {
     96     ASSERT(m_prerender);
     97     m_prerender->abandon();
     98     detach();
     99 }
    100 
    101 
    102 void PrerenderHandle::detach()
    103 {
    104     m_prerender->removeClient();
    105     m_prerender.clear();
    106 }
    107 
    108 }
    109