/*

 * 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 "WebBindings.h"

#include "npruntime_impl.h"

#include "npruntime_priv.h"

#if USE(V8)

#include "ChromiumDataObject.h"

#include "ClipboardChromium.h"

#include "EventNames.h"

#include "MouseEvent.h"

#include "NPV8Object.h"  // for PrivateIdentifier

#include "Range.h"

#include "V8BindingState.h"

#include "V8DOMWrapper.h"

#include "V8Event.h"

#include "V8Helpers.h"

#include "V8HiddenPropertyName.h"

#include "V8NPUtils.h"

#include "V8Proxy.h"

#include "V8Range.h"

#elif USE(JSC)

#include "bridge/c/c_utility.h"

#endif

#include "WebDragData.h"

#include "WebRange.h"

#if USE(JAVASCRIPTCORE_BINDINGS)

using JSC::Bindings::PrivateIdentifier;

#endif

using namespace WebCore;

namespace WebKit {

bool WebBindings::construct(NPP npp, NPObject *npobj, const NPVariant *args, uint32_t argCount, NPVariant* result)

{

    return _NPN_Construct(npp, npobj, args, argCount, result);

}

NPObject* WebBindings::createObject(NPP npp, NPClass* npClass)

{

    return _NPN_CreateObject(npp, npClass);

}

bool WebBindings::enumerate(NPP id, NPObject* obj, NPIdentifier** identifier, uint32_t* val)

{

    return _NPN_Enumerate(id, obj, identifier, val);

}

bool WebBindings::evaluate(NPP npp, NPObject* npObject, NPString* npScript, NPVariant* result)

{

    return _NPN_Evaluate(npp, npObject, npScript, result);

}

bool WebBindings::evaluateHelper(NPP npp, bool popups_allowed, NPObject* npobj, NPString* npscript, NPVariant* result)

{

    return _NPN_EvaluateHelper(npp, popups_allowed, npobj, npscript, result);

}

NPIdentifier WebBindings::getIntIdentifier(int32_t number)

{

    return _NPN_GetIntIdentifier(number);

}

bool WebBindings::getProperty(NPP npp, NPObject* obj, NPIdentifier propertyName, NPVariant *result)

{

    return _NPN_GetProperty(npp, obj, propertyName, result);

}

NPIdentifier WebBindings::getStringIdentifier(const NPUTF8* string)

{

    return _NPN_GetStringIdentifier(string);

}

void WebBindings::getStringIdentifiers(const NPUTF8** names, int32_t nameCount, NPIdentifier* identifiers)

{

    _NPN_GetStringIdentifiers(names, nameCount, identifiers);

}

bool WebBindings::hasMethod(NPP npp, NPObject* npObject, NPIdentifier methodName)

{

    return _NPN_HasMethod(npp, npObject, methodName);

}

bool WebBindings::hasProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName)

{

    return _NPN_HasProperty(npp, npObject, propertyName);

}

bool WebBindings::identifierIsString(NPIdentifier identifier)

{

    return _NPN_IdentifierIsString(identifier);

}

int32_t WebBindings::intFromIdentifier(NPIdentifier identifier)

{

    return _NPN_IntFromIdentifier(identifier);

}

void WebBindings::initializeVariantWithStringCopy(NPVariant* variant, const NPString* value)

{

#if USE(V8)

    _NPN_InitializeVariantWithStringCopy(variant, value);

#else

    NPN_InitializeVariantWithStringCopy(variant, value);

#endif

}

bool WebBindings::invoke(NPP npp, NPObject* npObject, NPIdentifier methodName, const NPVariant* arguments, uint32_t argumentCount, NPVariant* result)

{

    return _NPN_Invoke(npp, npObject, methodName, arguments, argumentCount, result);

}

bool WebBindings::invokeDefault(NPP id, NPObject* obj, const NPVariant* args, uint32_t count, NPVariant* result)

{

    return _NPN_InvokeDefault(id, obj, args, count, result);

}

void WebBindings::releaseObject(NPObject* npObject)

{

    return _NPN_ReleaseObject(npObject);

}

void WebBindings::releaseVariantValue(NPVariant* variant)

{

    _NPN_ReleaseVariantValue(variant);

}

bool WebBindings::removeProperty(NPP id, NPObject* object, NPIdentifier identifier)

{

    return  _NPN_RemoveProperty(id, object, identifier);

}

NPObject* WebBindings::retainObject(NPObject* npObject)

{

    return _NPN_RetainObject(npObject);

}

void WebBindings::setException(NPObject* obj, const NPUTF8* message)

{

    _NPN_SetException(obj, message);

}

bool WebBindings::setProperty(NPP id, NPObject* obj, NPIdentifier identifier, const NPVariant* variant)

{

    return _NPN_SetProperty(id, obj, identifier, variant);

}

void WebBindings::unregisterObject(NPObject* npObject)

{

#if USE(V8)

    _NPN_UnregisterObject(npObject);

#endif

}

NPUTF8* WebBindings::utf8FromIdentifier(NPIdentifier identifier)

{

    return _NPN_UTF8FromIdentifier(identifier);

}

void WebBindings::extractIdentifierData(const NPIdentifier& identifier, const NPUTF8*& string, int32_t& number, bool& isString)

{

    PrivateIdentifier* priv = static_cast<PrivateIdentifier*>(identifier);

    if (!priv) {

        isString = false;

        number = 0;

        return;

    }

    isString = priv->isString;

    if (isString)

        string = priv->value.string;

    else

        number = priv->value.number;

}

#if USE(V8)

static v8::Local<v8::Value> getEvent(const v8::Handle<v8::Context>& context)

{

    return context->Global()->GetHiddenValue(V8HiddenPropertyName::event());

}

static bool getDragDataImpl(NPObject* npobj, int* eventId, WebDragData* data)

{

    if (!npobj)

        return false;

    if (npobj->_class != npScriptObjectClass)

        return false;

    v8::HandleScope handleScope;

    v8::Handle<v8::Context> context = v8::Context::GetEntered();

    if (context.IsEmpty())

        return false;

    // Get the current WebCore event.

    v8::Handle<v8::Value> currentEvent(getEvent(context));

    Event* event = V8Event::toNative(v8::Handle<v8::Object>::Cast(currentEvent));

    if (!event)

        return false;

    // Check that the given npobj is that event.

    V8NPObject* object = reinterpret_cast<V8NPObject*>(npobj);

    Event* given = V8Event::toNative(object->v8Object);

    if (given != event)

        return false;

    // Check the execution frames are same origin.

    V8Proxy* current = V8Proxy::retrieve(V8Proxy::retrieveFrameForCurrentContext());

    Frame* frame = V8Proxy::retrieveFrame(context);

    if (!current || !V8BindingSecurity::canAccessFrame(V8BindingState::Only(), frame, false))

        return false;

    const EventNames& names(eventNames());

    const AtomicString& eventType(event->type());

    enum DragTargetMouseEventId {

        DragEnterId = 1, DragOverId = 2, DragLeaveId = 3, DropId = 4

    };

    // The event type should be a drag event.

    if (eventType == names.dragenterEvent)

        *eventId = DragEnterId;

    else if (eventType == names.dragoverEvent)

        *eventId = DragOverId;

    else if (eventType == names.dragleaveEvent)

        *eventId = DragLeaveId;

    else if (eventType == names.dropEvent)

        *eventId = DropId;

    else

        return false;

    // Drag events are mouse events and should have a clipboard.

    MouseEvent* me = static_cast<MouseEvent*>(event);

    Clipboard* clipboard = me->clipboard();

    if (!clipboard)

        return false;

    // And that clipboard should be accessible by WebKit policy.

    ClipboardChromium* chrome = static_cast<ClipboardChromium*>(clipboard);

    HashSet<String> accessible(chrome->types());

    if (accessible.isEmpty())

        return false;

    RefPtr<ChromiumDataObject> dataObject(chrome->dataObject());

    if (dataObject && data)

        *data = WebDragData(dataObject);

    return dataObject;

}

static bool getRangeImpl(NPObject* npobj, WebRange* range)

{

    V8NPObject* v8npobject = reinterpret_cast<V8NPObject*>(npobj);

    v8::Handle<v8::Object> v8object(v8npobject->v8Object);

    if (!V8Range::info.equals(V8DOMWrapper::domWrapperType(v8object)))

        return false;

    Range* native = V8Range::toNative(v8object);

    if (!native)

        return false;

    *range = WebRange(native);

    return true;

}

#endif

bool WebBindings::getDragData(NPObject* event, int* eventId, WebDragData* data)

{

#if USE(V8)

    return getDragDataImpl(event, eventId, data);

#else

    // Not supported on other ports (JSC, etc).

    return false;

#endif

}

bool WebBindings::isDragEvent(NPObject* event)

{

    int eventId;

    return getDragData(event, &eventId, 0);

}

bool WebBindings::getRange(NPObject* range, WebRange* webrange)

{

#if USE(V8)

    return getRangeImpl(range, webrange);

#else

    // Not supported on other ports (JSC, etc).

    return false;

#endif

}

void WebBindings::pushExceptionHandler(ExceptionHandler handler, void* data)

{

    WebCore::pushExceptionHandler(handler, data);

}

void WebBindings::popExceptionHandler()

{

    WebCore::popExceptionHandler();

}

} // namespace WebKit