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