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      1 /*
      2  * Copyright (C) 2011 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 
     32 #include "config.h"
     33 #include "core/loader/LinkLoader.h"
     34 
     35 #include "core/FetchInitiatorTypeNames.h"
     36 #include "core/dom/Document.h"
     37 #include "core/fetch/FetchRequest.h"
     38 #include "core/fetch/ResourceFetcher.h"
     39 #include "core/frame/Settings.h"
     40 #include "core/html/LinkRelAttribute.h"
     41 #include "core/loader/PrerenderHandle.h"
     42 #include "platform/Prerender.h"
     43 #include "platform/network/DNS.h"
     44 #include "public/platform/WebPrerender.h"
     45 
     46 namespace blink {
     47 
     48 static unsigned prerenderRelTypesFromRelAttribute(const LinkRelAttribute& relAttribute)
     49 {
     50     unsigned result = 0;
     51     if (relAttribute.isLinkPrerender())
     52         result |= blink::PrerenderRelTypePrerender;
     53     if (relAttribute.isLinkNext())
     54         result |= blink::PrerenderRelTypeNext;
     55 
     56     return result;
     57 }
     58 
     59 LinkLoader::LinkLoader(LinkLoaderClient* client)
     60     : m_client(client)
     61     , m_linkLoadTimer(this, &LinkLoader::linkLoadTimerFired)
     62     , m_linkLoadingErrorTimer(this, &LinkLoader::linkLoadingErrorTimerFired)
     63 {
     64 }
     65 
     66 LinkLoader::~LinkLoader()
     67 {
     68 }
     69 
     70 void LinkLoader::linkLoadTimerFired(Timer<LinkLoader>* timer)
     71 {
     72     ASSERT_UNUSED(timer, timer == &m_linkLoadTimer);
     73     m_client->linkLoaded();
     74 }
     75 
     76 void LinkLoader::linkLoadingErrorTimerFired(Timer<LinkLoader>* timer)
     77 {
     78     ASSERT_UNUSED(timer, timer == &m_linkLoadingErrorTimer);
     79     m_client->linkLoadingErrored();
     80 }
     81 
     82 void LinkLoader::notifyFinished(Resource* resource)
     83 {
     84     ASSERT(this->resource() == resource);
     85 
     86     if (resource->errorOccurred())
     87         m_linkLoadingErrorTimer.startOneShot(0, FROM_HERE);
     88     else
     89         m_linkLoadTimer.startOneShot(0, FROM_HERE);
     90 
     91     clearResource();
     92 }
     93 
     94 void LinkLoader::didStartPrerender()
     95 {
     96     m_client->didStartLinkPrerender();
     97 }
     98 
     99 void LinkLoader::didStopPrerender()
    100 {
    101     m_client->didStopLinkPrerender();
    102 }
    103 
    104 void LinkLoader::didSendLoadForPrerender()
    105 {
    106     m_client->didSendLoadForLinkPrerender();
    107 }
    108 
    109 void LinkLoader::didSendDOMContentLoadedForPrerender()
    110 {
    111     m_client->didSendDOMContentLoadedForLinkPrerender();
    112 }
    113 
    114 bool LinkLoader::loadLink(const LinkRelAttribute& relAttribute, const AtomicString& crossOriginMode, const String& type, const KURL& href, Document& document)
    115 {
    116     if (relAttribute.isDNSPrefetch()) {
    117         Settings* settings = document.settings();
    118         // FIXME: The href attribute of the link element can be in "//hostname" form, and we shouldn't attempt
    119         // to complete that as URL <https://bugs.webkit.org/show_bug.cgi?id=48857>.
    120         if (settings && settings->dnsPrefetchingEnabled() && href.isValid() && !href.isEmpty())
    121             prefetchDNS(href.host());
    122     }
    123 
    124     // FIXME(crbug.com/323096): Should take care of import.
    125     if ((relAttribute.isLinkPrefetch() || relAttribute.isLinkSubresource() || relAttribute.isTransitionExitingStylesheet()) && href.isValid() && document.frame()) {
    126         if (!m_client->shouldLoadLink())
    127             return false;
    128         Resource::Type type = relAttribute.isLinkSubresource() ?  Resource::LinkSubresource : Resource::LinkPrefetch;
    129         FetchRequest linkRequest(ResourceRequest(document.completeURL(href)), FetchInitiatorTypeNames::link);
    130         if (!crossOriginMode.isNull())
    131             linkRequest.setCrossOriginAccessControl(document.securityOrigin(), crossOriginMode);
    132         setResource(document.fetcher()->fetchLinkResource(type, linkRequest));
    133     }
    134 
    135     if (const unsigned prerenderRelTypes = prerenderRelTypesFromRelAttribute(relAttribute)) {
    136         if (!m_prerender) {
    137             m_prerender = PrerenderHandle::create(document, this, href, prerenderRelTypes);
    138         } else if (m_prerender->url() != href) {
    139             m_prerender->cancel();
    140             m_prerender = PrerenderHandle::create(document, this, href, prerenderRelTypes);
    141         }
    142         // TODO(gavinp): Handle changes to rel types of existing prerenders.
    143     } else if (m_prerender) {
    144         m_prerender->cancel();
    145         m_prerender.clear();
    146     }
    147     return true;
    148 }
    149 
    150 void LinkLoader::released()
    151 {
    152     // Only prerenders need treatment here; other links either use the Resource interface, or are notionally
    153     // atomic (dns prefetch).
    154     if (m_prerender) {
    155         m_prerender->cancel();
    156         m_prerender.clear();
    157     }
    158 }
    159 
    160 }
    161