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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 
CanvasRenderingContext(HTMLCanvasElement * canvas)39 CanvasRenderingContext::CanvasRenderingContext(HTMLCanvasElement* canvas)
40     : m_canvas(canvas)
41 {
42 }
43 
ref()44 void CanvasRenderingContext::ref()
45 {
46     m_canvas->ref();
47 }
48 
deref()49 void CanvasRenderingContext::deref()
50 {
51     m_canvas->deref();
52 }
53 
checkOrigin(const CanvasPattern * pattern)54 void CanvasRenderingContext::checkOrigin(const CanvasPattern* pattern)
55 {
56     if (canvas()->originClean() && pattern && !pattern->originClean())
57         canvas()->setOriginTainted();
58 }
59 
checkOrigin(const HTMLCanvasElement * sourceCanvas)60 void CanvasRenderingContext::checkOrigin(const HTMLCanvasElement* sourceCanvas)
61 {
62     if (canvas()->originClean() && sourceCanvas && !sourceCanvas->originClean())
63         canvas()->setOriginTainted();
64 }
65 
checkOrigin(const HTMLImageElement * image)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 
checkOrigin(const HTMLVideoElement * video)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 
checkOrigin(const KURL & url)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