third_party/WebKit/Source/core/loader/TextTrackLoader.cpp

   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
   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 COMPUTER, 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 COMPUTER, 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
  28 #include "core/loader/TextTrackLoader.h"
  29
  30 #include "core/dom/Document.h"
  31 #include "core/fetch/FetchInitiatorTypeNames.h"
  32 #include "core/fetch/FetchRequest.h"
  33 #include "core/fetch/RawResource.h"
  34 #include "core/fetch/ResourceFetcher.h"
  35 #include "core/inspector/ConsoleMessage.h"
  36 #include "platform/Logging.h"
  37 #include "platform/SharedBuffer.h"
  38 #include "platform/weborigin/SecurityOrigin.h"
  39
  40 namespace blink {
  41
  42 TextTrackLoader::TextTrackLoader(TextTrackLoaderClient& client, Document& document)
  43     : m_client(client)
  44     , m_document(document)
  45     , m_cueLoadTimer(this, &TextTrackLoader::cueLoadTimerFired)
  46     , m_state(Idle)
  47     , m_newCuesAvailable(false)
  48 {
  49 }
  50
  51 TextTrackLoader::~TextTrackLoader()
  52 {
  53 }
  54
  55 void TextTrackLoader::cueLoadTimerFired(Timer<TextTrackLoader>* timer)
  56 {
  57     ASSERT_UNUSED(timer, timer == &m_cueLoadTimer);
  58
  59     if (m_newCuesAvailable) {
  60         m_newCuesAvailable = false;
  61         m_client.newCuesAvailable(this);
  62     }
  63
  64     if (m_state >= Finished)
  65         m_client.cueLoadingCompleted(this, m_state == Failed);
  66 }
  67
  68 void TextTrackLoader::cancelLoad()
  69 {
  70     clearResource();
  71 }
  72
  73 void TextTrackLoader::dataReceived(Resource* resource, const char* data, unsigned length)
  74 {
  75     ASSERT(this->resource() == resource);
  76
  77     if (m_state == Failed)
  78         return;
  79
  80     if (!m_cueParser)
  81         m_cueParser = VTTParser::create(this, document());
  82
  83     m_cueParser->parseBytes(data, length);
  84 }
  85
  86 void TextTrackLoader::corsPolicyPreventedLoad(SecurityOrigin* securityOrigin, const KURL& url)
  87 {
  88     String consoleMessage("Text track from origin '" + SecurityOrigin::create(url)->toString() + "' has been blocked from loading: Not at same origin as the document, and parent of track element does not have a 'crossorigin' attribute. Origin '" + securityOrigin->toString() + "' is therefore not allowed access.");
  89     document().addConsoleMessage(ConsoleMessage::create(SecurityMessageSource, ErrorMessageLevel, consoleMessage));
  90     m_state = Failed;
  91 }
  92
  93 void TextTrackLoader::notifyFinished(Resource* resource)
  94 {
  95     ASSERT(this->resource() == resource);
  96     if (m_state != Failed)
  97         m_state = resource->errorOccurred() ? Failed : Finished;
  98
  99     if (m_state == Finished && m_cueParser)
 100         m_cueParser->flush();
 101
 102     if (!m_cueLoadTimer.isActive())
 103         m_cueLoadTimer.startOneShot(0, FROM_HERE);
 104
 105     cancelLoad();
 106 }
 107
 108 bool TextTrackLoader::load(const KURL& url, const AtomicString& crossOriginMode)
 109 {
 110     cancelLoad();
 111
 112     FetchRequest cueRequest(ResourceRequest(document().completeURL(url)), FetchInitiatorTypeNames::texttrack);
 113
 114     if (!crossOriginMode.isNull()) {
 115         cueRequest.setCrossOriginAccessControl(document().securityOrigin(), crossOriginMode);
 116     } else if (!document().securityOrigin()->canRequestNoSuborigin(url)) {
 117         // Text track elements without 'crossorigin' set on the parent are "No CORS"; report error if not same-origin.
 118         corsPolicyPreventedLoad(document().securityOrigin(), url);
 119         return false;
 120     }
 121
 122     ResourceFetcher* fetcher = document().fetcher();
 123     setResource(RawResource::fetchTextTrack(cueRequest, fetcher));
 124     return resource();
 125 }
 126
 127 void TextTrackLoader::newCuesParsed()
 128 {
 129     if (m_cueLoadTimer.isActive())
 130         return;
 131
 132     m_newCuesAvailable = true;
 133     m_cueLoadTimer.startOneShot(0, FROM_HERE);
 134 }
 135
 136 void TextTrackLoader::newRegionsParsed()
 137 {
 138     m_client.newRegionsAvailable(this);
 139 }
 140
 141 void TextTrackLoader::fileFailedToParse()
 142 {
 143     WTF_LOG(Media, "TextTrackLoader::fileFailedToParse");
 144
 145     m_state = Failed;
 146
 147     if (!m_cueLoadTimer.isActive())
 148         m_cueLoadTimer.startOneShot(0, FROM_HERE);
 149
 150     cancelLoad();
 151 }
 152
 153 void TextTrackLoader::getNewCues(HeapVector<Member<TextTrackCue>>& outputCues)
 154 {
 155     ASSERT(m_cueParser);
 156     if (m_cueParser)
 157         m_cueParser->getNewCues(outputCues);
 158 }
 159
 160 void TextTrackLoader::getNewRegions(HeapVector<Member<VTTRegion>>& outputRegions)
 161 {
 162     ASSERT(m_cueParser);
 163     if (m_cueParser)
 164         m_cueParser->getNewRegions(outputRegions);
 165 }
 166
 167 DEFINE_TRACE(TextTrackLoader)
 168 {
 169     visitor->trace(m_cueParser);
 170     visitor->trace(m_document);
 171 }
 172
 173 }