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/*
* Copyright (C) 2009 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 "HTMLImageElement.h"
#include "HTMLVideoElement.h"
#include "Image.h"
#include "URL.h"
#include "SecurityOrigin.h"
namespace WebCore {
CanvasRenderingContext::CanvasRenderingContext(HTMLCanvasElement* canvas)
: m_canvas(canvas)
{
}
bool CanvasRenderingContext::wouldTaintOrigin(const CanvasPattern* pattern)
{
if (canvas()->originClean() && pattern && !pattern->originClean())
return true;
return false;
}
bool CanvasRenderingContext::wouldTaintOrigin(const HTMLCanvasElement* sourceCanvas)
{
if (canvas()->originClean() && sourceCanvas && !sourceCanvas->originClean())
return true;
return false;
}
bool CanvasRenderingContext::wouldTaintOrigin(const HTMLImageElement* image)
{
if (!image || !canvas()->originClean())
return false;
CachedImage* cachedImage = image->cachedImage();
if (!cachedImage->image()->hasSingleSecurityOrigin())
return true;
return wouldTaintOrigin(cachedImage->responseForSameOriginPolicyChecks().url()) && !cachedImage->passesAccessControlCheck(*canvas()->securityOrigin());
}
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 || !canvas()->originClean())
return false;
if (!video->hasSingleSecurityOrigin())
return true;
if (!(video->player() && video->player()->didPassCORSAccessCheck()) && wouldTaintOrigin(video->currentSrc()))
return true;
#else
UNUSED_PARAM(video);
#endif
return false;
}
bool CanvasRenderingContext::wouldTaintOrigin(const URL& url)
{
if (!canvas()->originClean())
return false;
if (canvas()->securityOrigin()->taintsCanvas(url))
return true;
if (url.protocolIsData())
return false;
return false;
}
void CanvasRenderingContext::checkOrigin(const URL& url)
{
if (wouldTaintOrigin(url))
canvas()->setOriginTainted();
}
} // namespace WebCore
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