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/*
* Copyright (C) 2010 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 "third_party/blink/renderer/bindings/core/v8/v8_pop_state_event.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_history.h"
#include "third_party/blink/renderer/core/events/pop_state_event.h"
#include "third_party/blink/renderer/core/frame/history.h"
#include "third_party/blink/renderer/platform/bindings/v8_private_property.h"
namespace blink {
namespace {
// |kHistoryStateSymbolKey| is a key for a cached attribute for History.state.
// TODO(peria): Do not use this cached attribute directly.
constexpr char kHistoryStateSymbolKey[] = "History#State";
}
// Save the state value to a hidden attribute in the V8PopStateEvent, and return
// it, for convenience.
static v8::Local<v8::Value> CacheState(ScriptState* script_state,
v8::Local<v8::Object> pop_state_event,
v8::Local<v8::Value> state) {
V8PrivateProperty::GetPopStateEventState(script_state->GetIsolate())
.Set(pop_state_event, state);
return state;
}
void V8PopStateEvent::StateAttributeGetterCustom(
const v8::FunctionCallbackInfo<v8::Value>& info) {
v8::Isolate* isolate = info.GetIsolate();
ScriptState* script_state = ScriptState::Current(isolate);
V8PrivateProperty::Symbol property_symbol =
V8PrivateProperty::GetPopStateEventState(isolate);
v8::Local<v8::Value> result;
if (property_symbol.GetOrUndefined(info.Holder()).ToLocal(&result) &&
!result->IsUndefined()) {
V8SetReturnValue(info, result);
return;
}
PopStateEvent* event = V8PopStateEvent::ToImpl(info.Holder());
History* history = event->GetHistory();
if (!history || !event->SerializedState()) {
// If the event doesn't have serializedState(), it means that the
// event was initialized with PopStateEventInit. In such case, we need
// to get a v8 value for the current world from state().
if (event->SerializedState())
result = event->SerializedState()->Deserialize(isolate);
else
result = event->state(script_state).V8Value();
if (result.IsEmpty())
result = v8::Null(isolate);
V8SetReturnValue(info, CacheState(script_state, info.Holder(), result));
return;
}
// 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 is_same_state = history->IsSameAsCurrentState(event->SerializedState());
if (is_same_state) {
V8PrivateProperty::Symbol history_state =
V8PrivateProperty::GetSymbol(isolate, kHistoryStateSymbolKey);
v8::Local<v8::Value> v8_history_value =
ToV8(history, info.Holder(), isolate);
if (v8_history_value.IsEmpty())
return;
v8::Local<v8::Object> v8_history = v8_history_value.As<v8::Object>();
if (!history->stateChanged() && history_state.HasValue(v8_history)) {
v8::Local<v8::Value> value;
if (!history_state.GetOrUndefined(v8_history).ToLocal(&value))
return;
V8SetReturnValue(info, CacheState(script_state, info.Holder(), value));
return;
}
result = event->SerializedState()->Deserialize(isolate);
history_state.Set(v8_history, result);
} else {
result = event->SerializedState()->Deserialize(isolate);
}
V8SetReturnValue(info, CacheState(script_state, info.Holder(), result));
}
} // namespace blink
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