src/third_party/blink/Source/bindings/core/v8/BindingSecurity.cpp

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "bindings/core/v8/BindingSecurity.h"

#include "bindings/core/v8/V8Binding.h"
#include "core/dom/Document.h"
#include "core/frame/LocalDOMWindow.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Settings.h"
#include "core/html/HTMLFrameElementBase.h"
#include "platform/weborigin/SecurityOrigin.h"

namespace blink {

static bool isDocumentAccessibleFromDOMWindow(Document* targetDocument, LocalDOMWindow* callingWindow)
{
    if (!targetDocument)
        return false;

    if (!callingWindow)
        return false;

    if (callingWindow->document()->securityOrigin()->canAccess(targetDocument->securityOrigin()))
        return true;

    return false;
}

static bool canAccessDocument(v8::Isolate* isolate, Document* targetDocument, ExceptionState& exceptionState)
{
    LocalDOMWindow* callingWindow = callingDOMWindow(isolate);
    if (isDocumentAccessibleFromDOMWindow(targetDocument, callingWindow))
        return true;

    if (targetDocument->domWindow())
        exceptionState.throwSecurityError(targetDocument->domWindow()->sanitizedCrossDomainAccessErrorMessage(callingWindow), targetDocument->domWindow()->crossDomainAccessErrorMessage(callingWindow));
    return false;
}

static bool canAccessDocument(v8::Isolate* isolate, Document* targetDocument, SecurityReportingOption reportingOption = ReportSecurityError)
{
    LocalDOMWindow* callingWindow = callingDOMWindow(isolate);
    if (isDocumentAccessibleFromDOMWindow(targetDocument, callingWindow))
        return true;

    if (reportingOption == ReportSecurityError && targetDocument->domWindow()) {
        if (LocalFrame* frame = targetDocument->frame())
            frame->domWindow()->printErrorMessage(targetDocument->domWindow()->crossDomainAccessErrorMessage(callingWindow));
    }

    return false;
}

bool BindingSecurity::shouldAllowAccessToFrame(v8::Isolate* isolate, Frame* target, SecurityReportingOption reportingOption)
{
    if (!target || !target->isLocalFrame())
        return false;
    return canAccessDocument(isolate, toLocalFrame(target)->document(), reportingOption);
}

bool BindingSecurity::shouldAllowAccessToFrame(v8::Isolate* isolate, Frame* target, ExceptionState& exceptionState)
{
    if (!target || !target->isLocalFrame())
        return false;
    return canAccessDocument(isolate, toLocalFrame(target)->document(), exceptionState);
}

bool BindingSecurity::shouldAllowAccessToNode(v8::Isolate* isolate, Node* target, ExceptionState& exceptionState)
{
    return target && canAccessDocument(isolate, &target->document(), exceptionState);
}

}