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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "V8PopStateEvent.h"
     33 
     34 #include "V8History.h"
     35 #include "bindings/v8/SerializedScriptValue.h"
     36 #include "bindings/v8/V8HiddenPropertyName.h"
     37 #include "core/dom/PopStateEvent.h"
     38 #include "core/page/History.h"
     39 
     40 namespace WebCore {
     41 
     42 // Save the state value to a hidden attribute in the V8PopStateEvent, and return it, for convenience.
     43 static v8::Handle<v8::Value> cacheState(v8::Handle<v8::Object> popStateEvent, v8::Handle<v8::Value> state)
     44 {
     45     popStateEvent->SetHiddenValue(V8HiddenPropertyName::state(), state);
     46     return state;
     47 }
     48 
     49 void V8PopStateEvent::stateAttrGetterCustom(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
     50 {
     51     v8::Handle<v8::Value> result = info.Holder()->GetHiddenValue(V8HiddenPropertyName::state());
     52 
     53     if (!result.IsEmpty()) {
     54         v8SetReturnValue(info, result);
     55         return;
     56     }
     57 
     58     PopStateEvent* event = V8PopStateEvent::toNative(info.Holder());
     59     History* history = event->history();
     60     if (!history || !event->serializedState()) {
     61         if (!event->serializedState()) {
     62             // If we're in an isolated world and the event was created in the main world,
     63             // we need to find the 'state' property on the main world wrapper and clone it.
     64             v8::Local<v8::Value> mainWorldState = getHiddenValueFromMainWorldWrapper(info.GetIsolate(), event, V8HiddenPropertyName::state());
     65             if (!mainWorldState.IsEmpty())
     66                 event->setSerializedState(SerializedScriptValue::createAndSwallowExceptions(mainWorldState, info.GetIsolate()));
     67         }
     68         if (event->serializedState())
     69             result = event->serializedState()->deserialize();
     70         else
     71             result = v8::Null(info.GetIsolate());
     72         v8SetReturnValue(info, cacheState(info.Holder(), result));
     73         return;
     74     }
     75 
     76     // There's no cached value from a previous invocation, nor a state value was provided by the
     77     // event, but there is a history object, so first we need to see if the state object has been
     78     // deserialized through the history object already.
     79     // The current history state object might've changed in the meantime, so we need to take care
     80     // of using the correct one, and always share the same deserialization with history.state.
     81 
     82     bool isSameState = history->isSameAsCurrentState(event->serializedState());
     83 
     84     if (isSameState) {
     85         v8::Handle<v8::Object> v8History = toV8Fast(history, info, event).As<v8::Object>();
     86         if (!history->stateChanged()) {
     87             result = v8History->GetHiddenValue(V8HiddenPropertyName::state());
     88             if (!result.IsEmpty()) {
     89                 v8SetReturnValue(info, cacheState(info.Holder(), result));
     90                 return;
     91             }
     92         }
     93         result = event->serializedState()->deserialize(info.GetIsolate());
     94         v8History->SetHiddenValue(V8HiddenPropertyName::state(), result);
     95     } else {
     96         result = event->serializedState()->deserialize(info.GetIsolate());
     97     }
     98 
     99     v8SetReturnValue(info, cacheState(info.Holder(), result));
    100 }
    101 
    102 } // namespace WebCore
    103