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