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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2021 Apple 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 <JavaScriptCore/HeapInlines.h>
#include <JavaScriptCore/JSCJSValueInlines.h>
namespace WebCore {
using namespace JSC;
JSValue JSPopStateEvent::state(JSGlobalObject& lexicalGlobalObject) const
{
if (m_state) {
// We cannot use a cached object if we are in a different world than the one it was created in.
if (isWorldCompatible(lexicalGlobalObject, m_state.get()))
return m_state.get();
ASSERT_NOT_REACHED();
}
// Save the lexicalGlobalObject value to the m_state member of a JSPopStateEvent, and return it, for convenience.
auto cacheState = [&lexicalGlobalObject, this] (JSC::JSValue eventState) {
m_state.set(lexicalGlobalObject.vm(), this, eventState);
return eventState;
};
PopStateEvent& event = wrapped();
if (event.state()) {
JSC::JSValue eventState = event.state().getValue();
// We need to make sure a PopStateEvent does not leak objects in its lexicalGlobalObject property across isolated DOM worlds.
// Ideally, we would check that the worlds have different privileges but that's not possible yet.
if (!isWorldCompatible(lexicalGlobalObject, eventState)) {
if (auto serializedValue = event.trySerializeState(lexicalGlobalObject))
eventState = serializedValue->deserialize(lexicalGlobalObject, globalObject());
else
eventState = jsNull();
}
return cacheState(eventState);
}
History* history = event.history();
if (!history || !event.serializedState())
return cacheState(jsNull());
// There's no cached value from a previous invocation, nor a lexicalGlobalObject value was provided by the
// event, but there is a history object, so first we need to see if the lexicalGlobalObject object has been
// deserialized through the history object already.
// The current history lexicalGlobalObject 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.lexicalGlobalObject.
bool isSameState = history->isSameAsCurrentState(event.serializedState());
JSValue result;
if (isSameState) {
JSHistory* jsHistory = jsCast<JSHistory*>(toJS(&lexicalGlobalObject, globalObject(), *history).asCell());
result = jsHistory->state(lexicalGlobalObject);
} else
result = event.serializedState()->deserialize(lexicalGlobalObject, globalObject());
return cacheState(result);
}
template<typename Visitor>
void JSPopStateEvent::visitAdditionalChildren(Visitor& visitor)
{
wrapped().state().visit(visitor);
}
DEFINE_VISIT_ADDITIONAL_CHILDREN(JSPopStateEvent);
} // namespace WebCore
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