| /* |
| * Copyright (C) 2009 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "core/html/canvas/CanvasRenderingContext.h" |
| |
| #include "core/fetch/ImageResource.h" |
| #include "core/html/HTMLImageElement.h" |
| #include "core/html/HTMLVideoElement.h" |
| #include "core/html/canvas/CanvasPattern.h" |
| #include "platform/weborigin/SecurityOrigin.h" |
| |
| namespace WebCore { |
| |
| CanvasRenderingContext::CanvasRenderingContext(HTMLCanvasElement* canvas) |
| : m_canvas(canvas) |
| { |
| ScriptWrappable::init(this); |
| } |
| |
| bool CanvasRenderingContext::wouldTaintOrigin(const CanvasPattern* pattern) |
| { |
| if (canvas()->originClean() && pattern && !pattern->originClean()) |
| return true; |
| return false; |
| } |
| |
| bool CanvasRenderingContext::wouldTaintOrigin(const HTMLCanvasElement* sourceCanvas) |
| { |
| if (canvas()->originClean() && sourceCanvas && !sourceCanvas->originClean()) |
| return true; |
| return false; |
| } |
| |
| bool CanvasRenderingContext::wouldTaintOrigin(const HTMLImageElement* image) |
| { |
| if (!image || !canvas()->originClean()) |
| return false; |
| |
| ImageResource* cachedImage = image->cachedImage(); |
| if (!cachedImage->image()->currentFrameHasSingleSecurityOrigin()) |
| return true; |
| |
| return wouldTaintOrigin(cachedImage->response().url()) && !cachedImage->passesAccessControlCheck(canvas()->securityOrigin()); |
| } |
| |
| bool CanvasRenderingContext::wouldTaintOrigin(const HTMLVideoElement* video) |
| { |
| // FIXME: This check is likely wrong when a redirect is involved. We need |
| // to test the finalURL. Please be careful when fixing this issue not to |
| // make currentSrc be the final URL because then the |
| // HTMLMediaElement.currentSrc DOM API would leak redirect destinations! |
| if (!video || !canvas()->originClean()) |
| return false; |
| |
| if (!video->hasSingleSecurityOrigin()) |
| return true; |
| |
| if (!(video->player() && video->player()->didPassCORSAccessCheck()) && wouldTaintOrigin(video->currentSrc())) |
| return true; |
| |
| return false; |
| } |
| |
| bool CanvasRenderingContext::wouldTaintOrigin(const KURL& url) |
| { |
| if (!canvas()->originClean() || m_cleanURLs.contains(url.string())) |
| return false; |
| |
| if (canvas()->securityOrigin()->taintsCanvas(url)) |
| return true; |
| |
| if (url.protocolIsData()) |
| return false; |
| |
| m_cleanURLs.add(url.string()); |
| return false; |
| } |
| |
| void CanvasRenderingContext::checkOrigin(const KURL& url) |
| { |
| if (wouldTaintOrigin(url)) |
| canvas()->setOriginTainted(); |
| } |
| |
| } // namespace WebCore |