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 "FetchInitiatorTypeNames.h" 31 #include "core/dom/Document.h" 32 #include "core/html/track/WebVTTParser.h" 33 #include "core/loader/CrossOriginAccessControl.h" 34 #include "core/loader/cache/FetchRequest.h" 35 #include "core/loader/cache/ResourceFetcher.h" 36 #include "core/loader/cache/TextTrackResource.h" 37 #include "core/platform/Logging.h" 38 #include "core/platform/SharedBuffer.h" 39 #include "weborigin/SecurityOrigin.h" 40 41 namespace WebCore { 42 43 TextTrackLoader::TextTrackLoader(TextTrackLoaderClient* client, ScriptExecutionContext* context) 44 : m_client(client) 45 , m_scriptExecutionContext(context) 46 , m_cueLoadTimer(this, &TextTrackLoader::cueLoadTimerFired) 47 , m_state(Idle) 48 , m_parseOffset(0) 49 , m_newCuesAvailable(false) 50 { 51 } 52 53 TextTrackLoader::~TextTrackLoader() 54 { 55 if (m_cachedCueData) 56 m_cachedCueData->removeClient(this); 57 } 58 59 void TextTrackLoader::cueLoadTimerFired(Timer<TextTrackLoader>* timer) 60 { 61 ASSERT_UNUSED(timer, timer == &m_cueLoadTimer); 62 63 if (m_newCuesAvailable) { 64 m_newCuesAvailable = false; 65 m_client->newCuesAvailable(this); 66 } 67 68 if (m_state >= Finished) 69 m_client->cueLoadingCompleted(this, m_state == Failed); 70 } 71 72 void TextTrackLoader::cancelLoad() 73 { 74 if (m_cachedCueData) { 75 m_cachedCueData->removeClient(this); 76 m_cachedCueData = 0; 77 } 78 } 79 80 void TextTrackLoader::processNewCueData(Resource* resource) 81 { 82 ASSERT(m_cachedCueData == resource); 83 84 if (m_state == Failed || !resource->resourceBuffer()) 85 return; 86 87 SharedBuffer* buffer = resource->resourceBuffer(); 88 if (m_parseOffset == buffer->size()) 89 return; 90 91 if (!m_cueParser) 92 m_cueParser = WebVTTParser::create(this, m_scriptExecutionContext); 93 94 const char* data; 95 unsigned length; 96 97 while ((length = buffer->getSomeData(data, m_parseOffset))) { 98 m_cueParser->parseBytes(data, length); 99 m_parseOffset += length; 100 } 101 } 102 103 // FIXME: This is a very unusual pattern, no other ResourceClient does this. Refactor to use notifyFinished() instead. 104 void TextTrackLoader::deprecatedDidReceiveResource(Resource* resource) 105 { 106 ASSERT(m_cachedCueData == resource); 107 108 if (!resource->resourceBuffer()) 109 return; 110 111 processNewCueData(resource); 112 } 113 114 void TextTrackLoader::corsPolicyPreventedLoad() 115 { 116 DEFINE_STATIC_LOCAL(String, consoleMessage, ("Cross-origin text track load denied by Cross-Origin Resource Sharing policy.")); 117 Document* document = toDocument(m_scriptExecutionContext); 118 document->addConsoleMessage(SecurityMessageSource, ErrorMessageLevel, consoleMessage); 119 m_state = Failed; 120 } 121 122 void TextTrackLoader::notifyFinished(Resource* resource) 123 { 124 ASSERT(m_cachedCueData == resource); 125 126 Document* document = toDocument(m_scriptExecutionContext); 127 if (!m_crossOriginMode.isNull() 128 && !document->securityOrigin()->canRequest(resource->response().url()) 129 && !resource->passesAccessControlCheck(document->securityOrigin())) { 130 131 corsPolicyPreventedLoad(); 132 } 133 134 if (m_state != Failed) { 135 processNewCueData(resource); 136 if (m_state != Failed) 137 m_state = resource->errorOccurred() ? Failed : Finished; 138 } 139 140 if (!m_cueLoadTimer.isActive()) 141 m_cueLoadTimer.startOneShot(0); 142 143 cancelLoad(); 144 } 145 146 bool TextTrackLoader::load(const KURL& url, const String& crossOriginMode) 147 { 148 cancelLoad(); 149 150 if (!m_client->shouldLoadCues(this)) 151 return false; 152 153 ASSERT(m_scriptExecutionContext->isDocument()); 154 Document* document = toDocument(m_scriptExecutionContext); 155 FetchRequest cueRequest(ResourceRequest(document->completeURL(url)), FetchInitiatorTypeNames::texttrack); 156 157 if (!crossOriginMode.isNull()) { 158 m_crossOriginMode = crossOriginMode; 159 StoredCredentials allowCredentials = equalIgnoringCase(crossOriginMode, "use-credentials") ? AllowStoredCredentials : DoNotAllowStoredCredentials; 160 updateRequestForAccessControl(cueRequest.mutableResourceRequest(), document->securityOrigin(), allowCredentials); 161 } else { 162 // Cross-origin resources that are not suitably CORS-enabled may not load. 163 if (!document->securityOrigin()->canRequest(url)) { 164 corsPolicyPreventedLoad(); 165 return false; 166 } 167 } 168 169 ResourceFetcher* fetcher = document->fetcher(); 170 m_cachedCueData = fetcher->requestTextTrack(cueRequest); 171 if (m_cachedCueData) 172 m_cachedCueData->addClient(this); 173 174 m_client->cueLoadingStarted(this); 175 176 return true; 177 } 178 179 void TextTrackLoader::newCuesParsed() 180 { 181 if (m_cueLoadTimer.isActive()) 182 return; 183 184 m_newCuesAvailable = true; 185 m_cueLoadTimer.startOneShot(0); 186 } 187 188 #if ENABLE(WEBVTT_REGIONS) 189 void TextTrackLoader::newRegionsParsed() 190 { 191 m_client->newRegionsAvailable(this); 192 } 193 #endif 194 195 void TextTrackLoader::fileFailedToParse() 196 { 197 LOG(Media, "TextTrackLoader::fileFailedToParse"); 198 199 m_state = Failed; 200 201 if (!m_cueLoadTimer.isActive()) 202 m_cueLoadTimer.startOneShot(0); 203 204 cancelLoad(); 205 } 206 207 void TextTrackLoader::getNewCues(Vector<RefPtr<TextTrackCue> >& outputCues) 208 { 209 ASSERT(m_cueParser); 210 if (m_cueParser) 211 m_cueParser->getNewCues(outputCues); 212 } 213 214 #if ENABLE(WEBVTT_REGIONS) 215 void TextTrackLoader::getNewRegions(Vector<RefPtr<TextTrackRegion> >& outputRegions) 216 { 217 ASSERT(m_cueParser); 218 if (m_cueParser) 219 m_cueParser->getNewRegions(outputRegions); 220 } 221 #endif 222 } 223 224
