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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 "core/html/canvas/CanvasRenderingContext.h"
     28 
     29 #include "core/html/canvas/CanvasImageSource.h"
     30 #include "platform/weborigin/SecurityOrigin.h"
     31 
     32 namespace WebCore {
     33 
     34 CanvasRenderingContext::CanvasRenderingContext(HTMLCanvasElement* canvas)
     35     : m_canvas(canvas)
     36 {
     37 
     38 }
     39 
     40 bool CanvasRenderingContext::wouldTaintOrigin(CanvasImageSource* imageSource)
     41 {
     42     const KURL& sourceURL = imageSource->sourceURL();
     43     bool hasURL = (sourceURL.isValid() && !sourceURL.isAboutBlankURL());
     44 
     45     if (hasURL) {
     46         if (sourceURL.protocolIsData() || m_cleanURLs.contains(sourceURL.string()))
     47             return false;
     48         if (m_dirtyURLs.contains(sourceURL.string()))
     49             return true;
     50     }
     51 
     52     bool taintOrigin = imageSource->wouldTaintOrigin(canvas()->securityOrigin());
     53 
     54     if (hasURL) {
     55         if (taintOrigin)
     56             m_dirtyURLs.add(sourceURL.string());
     57         else
     58             m_cleanURLs.add(sourceURL.string());
     59     }
     60     return taintOrigin;
     61 }
     62 
     63 } // namespace WebCore
     64