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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "CanvasRenderingContext.h"
     28 
     29 #include "CachedImage.h"
     30 #include "CanvasPattern.h"
     31 #include "HTMLCanvasElement.h"
     32 #include "HTMLImageElement.h"
     33 #include "HTMLVideoElement.h"
     34 #include "KURL.h"
     35 #include "SecurityOrigin.h"
     36 
     37 namespace WebCore {
     38 
     39 CanvasRenderingContext::CanvasRenderingContext(HTMLCanvasElement* canvas)
     40     : m_canvas(canvas)
     41 {
     42 }
     43 
     44 void CanvasRenderingContext::ref()
     45 {
     46     m_canvas->ref();
     47 }
     48 
     49 void CanvasRenderingContext::deref()
     50 {
     51     m_canvas->deref();
     52 }
     53 
     54 void CanvasRenderingContext::checkOrigin(const CanvasPattern* pattern)
     55 {
     56     if (canvas()->originClean() && pattern && !pattern->originClean())
     57         canvas()->setOriginTainted();
     58 }
     59 
     60 void CanvasRenderingContext::checkOrigin(const HTMLCanvasElement* sourceCanvas)
     61 {
     62     if (canvas()->originClean() && sourceCanvas && !sourceCanvas->originClean())
     63         canvas()->setOriginTainted();
     64 }
     65 
     66 void CanvasRenderingContext::checkOrigin(const HTMLImageElement* image)
     67 {
     68     if (!image || !canvas()->originClean())
     69         return;
     70 
     71     CachedImage* cachedImage = image->cachedImage();
     72     checkOrigin(cachedImage->response().url());
     73 
     74     if (canvas()->originClean() && !cachedImage->image()->hasSingleSecurityOrigin())
     75         canvas()->setOriginTainted();
     76 }
     77 
     78 void CanvasRenderingContext::checkOrigin(const HTMLVideoElement* video)
     79 {
     80 #if ENABLE(VIDEO)
     81     checkOrigin(KURL(KURL(), video->currentSrc()));
     82     if (canvas()->originClean() && video && !video->hasSingleSecurityOrigin())
     83         canvas()->setOriginTainted();
     84 #endif
     85 }
     86 
     87 void CanvasRenderingContext::checkOrigin(const KURL& url)
     88 {
     89     if (!canvas()->originClean() || m_cleanOrigins.contains(url.string()))
     90         return;
     91 
     92     if (canvas()->securityOrigin().taintsCanvas(url))
     93         canvas()->setOriginTainted();
     94     else
     95         m_cleanOrigins.add(url.string());
     96 }
     97 
     98 } // namespace WebCore
     99