CanvasRenderingContext.cpp [plain text]
#include "config.h"
#include "CanvasRenderingContext.h"
#include "CachedImage.h"
#include "CanvasPattern.h"
#include "HTMLCanvasElement.h"
#include "HTMLImageElement.h"
#include "HTMLVideoElement.h"
#include "KURL.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->response().url()) && !cachedImage->passesAccessControlCheck(canvas()->securityOrigin());
}
bool CanvasRenderingContext::wouldTaintOrigin(const HTMLVideoElement* video)
{
#if ENABLE(VIDEO)
if (!video || !canvas()->originClean())
return false;
if (wouldTaintOrigin(video->currentSrc()))
return true;
if (!video->hasSingleSecurityOrigin())
return true;
#else
UNUSED_PARAM(video);
#endif
return false;
}
bool CanvasRenderingContext::wouldTaintOrigin(const KURL& url)
{
if (!canvas()->originClean() || m_cleanURLs.contains(url.string()))
return false;
if (canvas()->securityOrigin()->taintsCanvas(url))
return true;
if (url.protocolIsData())
return false;
m_cleanURLs.add(url.string());
return false;
}
void CanvasRenderingContext::checkOrigin(const KURL& url)
{
if (wouldTaintOrigin(url))
canvas()->setOriginTainted();
}
}