/*

 * Copyright (C) 2009 Google Inc. All rights reserved.

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 * modification, are permitted provided that the following conditions are

 * met:

 * 

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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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 * this software without specific prior written permission.

 * 

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

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 */

#ifndef BindingSecurity_h

#define BindingSecurity_h

#include "BindingSecurityBase.h"

#include "CSSHelper.h"

#include "Element.h"

#include "GenericBinding.h"

#include "HTMLFrameElementBase.h"

#include "HTMLNames.h"

namespace WebCore {

class DOMWindow;

class Frame;

class Node;

// Security functions shared by various language bindings.

template <class Binding>

class BindingSecurity : public BindingSecurityBase {

public:

    // Check if the active execution context can access the target frame.

    static bool canAccessFrame(State<Binding>*, Frame*, bool reportError);

    // Check if it is safe to access the given node from the

    // current security context.

    static bool checkNodeSecurity(State<Binding>*, Node* target);

    static bool allowSettingFrameSrcToJavascriptUrl(State<Binding>*, HTMLFrameElementBase*, String value);

    static bool allowSettingSrcToJavascriptURL(State<Binding>*, Element*, String name, String value);

private:

    explicit BindingSecurity() {}

    ~BindingSecurity();

    // Check if the current DOMWindow's security context can access the target

    // DOMWindow.  This function does not report errors, so most callers should

    // use canAccessFrame instead.

    static bool canAccessWindow(State<Binding>*, DOMWindow* target);

};

// Implementations of templated methods must be in this file.

template <class Binding>

bool BindingSecurity<Binding>::canAccessWindow(State<Binding>* state,

                                               DOMWindow* targetWindow)

{

    DOMWindow* activeWindow = state->getActiveWindow();

    return canAccess(activeWindow, targetWindow);

}

template <class Binding>

bool BindingSecurity<Binding>::canAccessFrame(State<Binding>* state,

                                              Frame* target,

                                              bool reportError)

{

    // The subject is detached from a frame, deny accesses.

    if (!target)

        return false;

    if (!canAccessWindow(state, getDOMWindow(target))) {

        if (reportError)

            state->immediatelyReportUnsafeAccessTo(target);

        return false;

    }

    return true;

}

template <class Binding>

bool BindingSecurity<Binding>::checkNodeSecurity(State<Binding>* state, Node* node)

{

    if (!node)

        return false;

    Frame* target = getFrame(node);

    if (!target)

        return false;

    return canAccessFrame(state, target, true);

}

template <class Binding>

bool BindingSecurity<Binding>::allowSettingFrameSrcToJavascriptUrl(State<Binding>* state, HTMLFrameElementBase* frame, String value)

{

    if (protocolIsJavaScript(deprecatedParseURL(value))) {

        Node* contentDoc = frame->contentDocument();

        if (contentDoc && !checkNodeSecurity(state, contentDoc))

            return false;

    }

    return true;

}

template <class Binding>

bool BindingSecurity<Binding>::allowSettingSrcToJavascriptURL(State<Binding>* state, Element* element, String name, String value)

{

    if ((element->hasTagName(HTMLNames::iframeTag) || element->hasTagName(HTMLNames::frameTag)) && equalIgnoringCase(name, "src"))

        return allowSettingFrameSrcToJavascriptUrl(state, static_cast<HTMLFrameElementBase*>(element), value);

    return true;

}

}

#endif // BindingSecurity_h