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 "bindings/core/v8/V8PopStateEvent.h" 33 34 #include "bindings/core/v8/SerializedScriptValue.h" 35 #include "bindings/core/v8/V8HiddenValue.h" 36 #include "bindings/core/v8/V8History.h" 37 #include "core/events/PopStateEvent.h" 38 #include "core/frame/History.h" 39 40 namespace blink { 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, v8::Isolate* isolate) 44 { 45 V8HiddenValue::setHiddenValue(isolate, popStateEvent, V8HiddenValue::state(isolate), state); 46 return state; 47 } 48 49 void V8PopStateEvent::stateAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info) 50 { 51 v8::Handle<v8::Value> result = V8HiddenValue::getHiddenValue(info.GetIsolate(), info.Holder(), V8HiddenValue::state(info.GetIsolate())); 52 53 if (!result.IsEmpty()) { 54 v8SetReturnValue(info, result); 55 return; 56 } 57 58 PopStateEvent* event = V8PopStateEvent::toImpl(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 = V8HiddenValue::getHiddenValueFromMainWorldWrapper(info.GetIsolate(), event, V8HiddenValue::state(info.GetIsolate())); 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, info.GetIsolate())); 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 = toV8(history, info.Holder(), info.GetIsolate()).As<v8::Object>(); 86 if (!history->stateChanged()) { 87 result = V8HiddenValue::getHiddenValue(info.GetIsolate(), v8History, V8HiddenValue::state(info.GetIsolate())); 88 if (!result.IsEmpty()) { 89 v8SetReturnValue(info, cacheState(info.Holder(), result, info.GetIsolate())); 90 return; 91 } 92 } 93 result = event->serializedState()->deserialize(info.GetIsolate()); 94 V8HiddenValue::setHiddenValue(info.GetIsolate(), v8History, V8HiddenValue::state(info.GetIsolate()), result); 95 } else { 96 result = event->serializedState()->deserialize(info.GetIsolate()); 97 } 98 99 v8SetReturnValue(info, cacheState(info.Holder(), result, info.GetIsolate())); 100 } 101 102 } // namespace blink 103