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/*
* Copyright (C) 2011-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "TrackBase.h"
#include "Logging.h"
#include "ScriptExecutionContext.h"
#include "TrackListBase.h"
#include <wtf/Language.h>
#include <wtf/text/StringBuilder.h>
#if ENABLE(VIDEO)
namespace WebCore {
static int s_uniqueId = 0;
static bool isValidBCP47LanguageTag(const String&);
#if !RELEASE_LOG_DISABLED
static RefPtr<Logger>& nullLogger()
{
static NeverDestroyed<RefPtr<Logger>> logger;
return logger;
}
#endif
TrackBase::TrackBase(ScriptExecutionContext* context, Type type, const AtomString& id, const AtomString& label, const AtomString& language)
: ContextDestructionObserver(context)
, m_uniqueId(++s_uniqueId)
, m_id(id)
, m_label(label)
, m_language(language)
{
ASSERT(type != BaseTrack);
if (isValidBCP47LanguageTag(language))
m_validBCP47Language = language;
m_type = type;
#if !RELEASE_LOG_DISABLED
if (!nullLogger().get()) {
nullLogger() = Logger::create(this);
nullLogger()->setEnabled(this, false);
}
m_logger = nullLogger().get();
#endif
}
void TrackBase::setTrackList(TrackListBase& trackList)
{
m_trackList = trackList;
}
void TrackBase::clearTrackList()
{
m_trackList = nullptr;
}
TrackListBase* TrackBase::trackList() const
{
return m_trackList.get();
}
WebCoreOpaqueRoot TrackBase::opaqueRoot()
{
if (auto trackList = this->trackList())
return trackList->opaqueRoot();
return WebCoreOpaqueRoot { this };
}
// See: https://tools.ietf.org/html/bcp47#section-2.1
static bool isValidBCP47LanguageTag(const String& languageTag)
{
auto const length = languageTag.length();
// Max length picked as double the longest example tag in spec which is 49 characters:
// https://tools.ietf.org/html/bcp47#section-4.4.2
if (length < 2 || length > 100)
return false;
UChar firstChar = languageTag[0];
if (!isASCIIAlpha(firstChar))
return false;
UChar secondChar = languageTag[1];
if (length == 2)
return isASCIIAlpha(secondChar);
bool grandFatheredIrregularOrPrivateUse = (firstChar == 'i' || firstChar == 'x') && secondChar == '-';
unsigned nextCharIndexToCheck;
if (!grandFatheredIrregularOrPrivateUse) {
if (!isASCIIAlpha(secondChar))
return false;
if (length == 3)
return isASCIIAlpha(languageTag[2]);
if (isASCIIAlpha(languageTag[2])) {
if (languageTag[3] == '-')
nextCharIndexToCheck = 4;
else
return false;
} else if (languageTag[2] == '-')
nextCharIndexToCheck = 3;
else
return false;
} else
nextCharIndexToCheck = 2;
for (; nextCharIndexToCheck < length; ++nextCharIndexToCheck) {
UChar c = languageTag[nextCharIndexToCheck];
if (isASCIIAlphanumeric(c) || c == '-')
continue;
return false;
}
return true;
}
void TrackBase::setLanguage(const AtomString& language)
{
m_language = language;
if (language.isEmpty() || isValidBCP47LanguageTag(language)) {
m_validBCP47Language = language;
return;
}
m_validBCP47Language = emptyAtom();
auto context = scriptExecutionContext();
if (!context)
return;
String message;
if (language.contains((UChar)'\0'))
message = "The language contains a null character and is not a valid BCP 47 language tag."_s;
else
message = makeString("The language '", language, "' is not a valid BCP 47 language tag.");
context->addConsoleMessage(MessageSource::Rendering, MessageLevel::Warning, message);
}
#if !RELEASE_LOG_DISABLED
void TrackBase::setLogger(const Logger& logger, const void* logIdentifier)
{
m_logger = &logger;
m_logIdentifier = childLogIdentifier(logIdentifier, m_uniqueId);
}
WTFLogChannel& TrackBase::logChannel() const
{
return LogMedia;
}
#endif
MediaTrackBase::MediaTrackBase(ScriptExecutionContext* context, Type type, const AtomString& id, const AtomString& label, const AtomString& language)
: TrackBase(context, type, id, label, language)
{
}
void MediaTrackBase::setKind(const AtomString& kind)
{
setKindInternal(kind);
}
void MediaTrackBase::setKindInternal(const AtomString& kind)
{
if (isValidKind(kind))
m_kind = kind;
else
m_kind = emptyAtom();
}
} // namespace WebCore
#endif
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