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/*
* Copyright (C) 2009-2021 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 "CanvasRenderingContext.h"
#include "CachedImage.h"
#include "CanvasPattern.h"
#include "DestinationColorSpace.h"
#include "GraphicsLayerContentsDisplayDelegate.h"
#include "HTMLCanvasElement.h"
#include "HTMLImageElement.h"
#include "HTMLVideoElement.h"
#include "Image.h"
#include "ImageBitmap.h"
#include "PixelFormat.h"
#include "SecurityOrigin.h"
#include <wtf/HashSet.h>
#include <wtf/IsoMallocInlines.h>
#include <wtf/Lock.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/URL.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(CanvasRenderingContext);
Lock CanvasRenderingContext::s_instancesLock;
HashSet<CanvasRenderingContext*>& CanvasRenderingContext::instances()
{
static NeverDestroyed<HashSet<CanvasRenderingContext*>> instances;
return instances;
}
Lock& CanvasRenderingContext::instancesLock()
{
return s_instancesLock;
}
CanvasRenderingContext::CanvasRenderingContext(CanvasBase& canvas)
: m_canvas(canvas)
{
Locker locker { instancesLock() };
instances().add(this);
}
CanvasRenderingContext::~CanvasRenderingContext()
{
Locker locker { instancesLock() };
ASSERT(instances().contains(this));
instances().remove(this);
}
void CanvasRenderingContext::ref()
{
m_canvas.refCanvasBase();
}
void CanvasRenderingContext::deref()
{
m_canvas.derefCanvasBase();
}
RefPtr<GraphicsLayerContentsDisplayDelegate> CanvasRenderingContext::layerContentsDisplayDelegate()
{
return nullptr;
}
PixelFormat CanvasRenderingContext::pixelFormat() const
{
return PixelFormat::BGRA8;
}
DestinationColorSpace CanvasRenderingContext::colorSpace() const
{
return DestinationColorSpace::SRGB();
}
bool CanvasRenderingContext::wouldTaintOrigin(const CanvasPattern* pattern)
{
if (m_canvas.originClean() && pattern && !pattern->originClean())
return true;
return false;
}
bool CanvasRenderingContext::wouldTaintOrigin(const CanvasBase* sourceCanvas)
{
if (m_canvas.originClean() && sourceCanvas && !sourceCanvas->originClean())
return true;
return false;
}
bool CanvasRenderingContext::wouldTaintOrigin(const HTMLImageElement* element)
{
if (!element || !m_canvas.originClean())
return false;
auto* cachedImage = element->cachedImage();
if (!cachedImage)
return false;
RefPtr image = cachedImage->image();
if (!image)
return false;
if (image->sourceURL().protocolIsData())
return false;
if (!image->hasSingleSecurityOrigin())
return true;
if (!cachedImage->isCORSSameOrigin())
return true;
ASSERT(m_canvas.securityOrigin());
ASSERT(cachedImage->origin());
ASSERT(m_canvas.securityOrigin()->toString() == cachedImage->origin()->toString());
return false;
}
bool CanvasRenderingContext::wouldTaintOrigin(const HTMLVideoElement* video)
{
#if ENABLE(VIDEO)
// FIXME: This check is likely wrong when a redirect is involved. We need
// to test the finalURL. Please be careful when fixing this issue not to
// make currentSrc be the final URL because then the
// HTMLMediaElement.currentSrc DOM API would leak redirect destinations!
if (!video || !m_canvas.originClean())
return false;
if (!video->hasSingleSecurityOrigin())
return true;
if (!(video->player() && video->player()->didPassCORSAccessCheck()) && video->wouldTaintOrigin(*m_canvas.securityOrigin()))
return true;
#else
UNUSED_PARAM(video);
#endif
return false;
}
bool CanvasRenderingContext::wouldTaintOrigin(const ImageBitmap* imageBitmap)
{
if (!imageBitmap || !m_canvas.originClean())
return false;
return !imageBitmap->originClean();
}
bool CanvasRenderingContext::wouldTaintOrigin(const URL& url)
{
if (!m_canvas.originClean())
return false;
if (url.protocolIsData())
return false;
return !m_canvas.securityOrigin()->canRequest(url);
}
void CanvasRenderingContext::checkOrigin(const URL& url)
{
if (wouldTaintOrigin(url))
m_canvas.setOriginTainted();
}
void CanvasRenderingContext::checkOrigin(const CSSStyleImageValue&)
{
m_canvas.setOriginTainted();
}
} // namespace WebCore
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