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/*
* Copyright (C) 2011 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 "JSPopStateEvent.h"
#include "DOMWrapperWorld.h"
#include "JSHistory.h"
#include <runtime/JSCJSValueInlines.h>
using namespace JSC;
namespace WebCore {
// Save the state value to the m_state member of a JSPopStateEvent, and return it, for convenience.
static const JSValue& cacheState(ExecState& state, const JSPopStateEvent* event, const JSValue& eventState)
{
event->m_state.set(state.vm(), event, eventState);
return eventState;
}
JSValue JSPopStateEvent::state(ExecState& state) const
{
JSValue cachedValue = m_state.get();
if (!cachedValue.isEmpty()) {
// We cannot use a cached object if we are in a different world than the one it was created in.
if (!cachedValue.isObject() || &worldForDOMObject(cachedValue.getObject()) == ¤tWorld(&state))
return cachedValue;
ASSERT_NOT_REACHED();
}
PopStateEvent& event = wrapped();
if (!event.state().hasNoValue()) {
// We need to make sure a PopStateEvent does not leak objects in its state property across isolated DOM worlds.
// Ideally, we would check that the worlds have different privileges but that's not possible yet.
JSValue eventState = event.state().jsValue();
if (eventState.isObject() && &worldForDOMObject(eventState.getObject()) != ¤tWorld(&state)) {
if (RefPtr<SerializedScriptValue> serializedValue = event.trySerializeState(&state))
eventState = serializedValue->deserialize(&state, globalObject(), nullptr);
else
eventState = jsNull();
}
return cacheState(state, this, eventState);
}
History* history = event.history();
if (!history || !event.serializedState())
return cacheState(state, this, jsNull());
// There's no cached value from a previous invocation, nor a state value was provided by the
// event, but there is a history object, so first we need to see if the state object has been
// deserialized through the history object already.
// The current history state object might've changed in the meantime, so we need to take care
// of using the correct one, and always share the same deserialization with history.state.
bool isSameState = history->isSameAsCurrentState(event.serializedState().get());
JSValue result;
if (isSameState) {
JSHistory* jsHistory = jsCast<JSHistory*>(toJS(&state, globalObject(), history).asCell());
result = jsHistory->state(state);
} else
result = event.serializedState()->deserialize(&state, globalObject(), 0);
return cacheState(state, this, result);
}
} // namespace WebCore
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