/*
 * Copyright (C) 2009 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * 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
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER 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 "ScriptEventListener.h"

#include "Attribute.h"
#include "Document.h"
#include "EventListener.h"
#include "JSNode.h"
#include "Frame.h"
#include "XSSAuditor.h"
#include <runtime/JSLock.h>

using namespace JSC;

namespace WebCore {

static const String& eventParameterName(bool isSVGEvent)
{
    DEFINE_STATIC_LOCAL(const String, eventString, ("event"));
    DEFINE_STATIC_LOCAL(const String, evtString, ("evt"));
    return isSVGEvent ? evtString : eventString;
}

PassRefPtr<JSLazyEventListener> createAttributeEventListener(Node* node, Attribute* attr)
{
    ASSERT(node);
    ASSERT(attr);
    if (attr->isNull())
        return 0;

    int lineNumber = 1;
    String sourceURL;
    
    // FIXME: We should be able to provide accurate source information for frameless documents, too (e.g. for importing nodes from XMLHttpRequest.responseXML).
    if (Frame* frame = node->document()->frame()) {
        ScriptController* scriptController = frame->script();
        if (!scriptController->canExecuteScripts(AboutToExecuteScript))
            return 0;

        if (!scriptController->xssAuditor()->canCreateInlineEventListener(attr->localName().string(), attr->value())) {
            // This script is not safe to execute.
            return 0;
        }

        lineNumber = scriptController->eventHandlerLineNumber();
        sourceURL = node->document()->url().string();
    }

    return JSLazyEventListener::create(attr->localName().string(), eventParameterName(node->isSVGElement()), attr->value(), node, sourceURL, lineNumber, 0, mainThreadNormalWorld());
}

PassRefPtr<JSLazyEventListener> createAttributeEventListener(Frame* frame, Attribute* attr)
{
    if (!frame)
        return 0;

    ASSERT(attr);
    if (attr->isNull())
        return 0;

    int lineNumber = 1;
    String sourceURL;
    
    ScriptController* scriptController = frame->script();
    if (!scriptController->canExecuteScripts(AboutToExecuteScript))
        return 0;

    if (!scriptController->xssAuditor()->canCreateInlineEventListener(attr->localName().string(), attr->value())) {
        // This script is not safe to execute.
        return 0;
    }

    lineNumber = scriptController->eventHandlerLineNumber();
    sourceURL = frame->document()->url().string();
    JSObject* wrapper = toJSDOMWindow(frame, mainThreadNormalWorld());
    return JSLazyEventListener::create(attr->localName().string(), eventParameterName(frame->document()->isSVGDocument()), attr->value(), 0, sourceURL, lineNumber, wrapper, mainThreadNormalWorld());
}

String getEventListenerHandlerBody(ScriptExecutionContext* context, ScriptState* scriptState, EventListener* eventListener)
{
    const JSEventListener* jsListener = JSEventListener::cast(eventListener);
    if (!jsListener)
        return "";
    JSC::JSObject* jsFunction = jsListener->jsFunction(context);
    if (!jsFunction)
        return "";
    return jsFunction->toString(scriptState);
}

} // namespace WebCore
