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27 #include "CanvasRenderingContext.h"
29 #include "CachedImage.h"
30 #include "CanvasPattern.h"
31 #include "HTMLCanvasElement.h"
32 #include "HTMLImageElement.h"
33 #include "HTMLVideoElement.h"
35 #include "SecurityOrigin.h"
39 CanvasRenderingContext::CanvasRenderingContext(HTMLCanvasElement* canvas)
44 bool CanvasRenderingContext::wouldTaintOrigin(const CanvasPattern* pattern)
46 if (canvas()->originClean() && pattern && !pattern->originClean())
51 bool CanvasRenderingContext::wouldTaintOrigin(const HTMLCanvasElement* sourceCanvas)
53 if (canvas()->originClean() && sourceCanvas && !sourceCanvas->originClean())
58 bool CanvasRenderingContext::wouldTaintOrigin(const HTMLImageElement* image)
60 if (!image || !canvas()->originClean())
63 CachedImage* cachedImage = image->cachedImage();
64 if (!cachedImage->passesAccessControlCheck(canvas()->securityOrigin())) {
65 if (wouldTaintOrigin(cachedImage->response().url()))
69 if (!cachedImage->image()->hasSingleSecurityOrigin())
75 bool CanvasRenderingContext::wouldTaintOrigin(const HTMLVideoElement* video)
78 // FIXME: This check is likely wrong when a redirect is involved. We need
79 // to test the finalURL. Please be careful when fixing this issue not to
80 // make currentSrc be the final URL because then the
81 // HTMLMediaElement.currentSrc DOM API would leak redirect destinations!
82 if (!video || !canvas()->originClean())
85 if (wouldTaintOrigin(video->currentSrc()))
88 if (!video->hasSingleSecurityOrigin())
95 bool CanvasRenderingContext::wouldTaintOrigin(const KURL& url)
97 if (!canvas()->originClean() || m_cleanURLs.contains(url.string()))
100 if (canvas()->securityOrigin()->taintsCanvas(url))
103 m_cleanURLs.add(url.string());
107 void CanvasRenderingContext::checkOrigin(const KURL& url)
109 if (wouldTaintOrigin(url))
110 canvas()->setOriginTainted();
113 } // namespace WebCore