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      1 /*
      2  * Copyright (C) 2006, 2007, 2008, 2009 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 
     33 #if ENABLE(WORKERS)
     34 
     35 #include "V8WorkerContextEventListener.h"
     36 
     37 #include "V8Binding.h"
     38 #include "V8DOMWrapper.h"
     39 #include "V8Event.h"
     40 #include "WorkerContext.h"
     41 #include "WorkerContextExecutionProxy.h"
     42 
     43 namespace WebCore {
     44 
     45 static WorkerContextExecutionProxy* workerProxy(ScriptExecutionContext* context)
     46 {
     47     ASSERT(context->isWorkerContext());
     48     WorkerContext* workerContext = static_cast<WorkerContext*>(context);
     49     return workerContext->script()->proxy();
     50 }
     51 
     52 V8WorkerContextEventListener::V8WorkerContextEventListener(v8::Local<v8::Object> listener, bool isInline, const WorldContextHandle& worldContext)
     53     : V8EventListener(listener, isInline, worldContext)
     54 {
     55 }
     56 
     57 void V8WorkerContextEventListener::handleEvent(ScriptExecutionContext* context, Event* event)
     58 {
     59     if (!context)
     60         return;
     61 
     62     // The callback function on XMLHttpRequest can clear the event listener and destroys 'this' object. Keep a local reference to it.
     63     // See issue 889829.
     64     RefPtr<V8AbstractEventListener> protect(this);
     65 
     66     v8::HandleScope handleScope;
     67 
     68     WorkerContextExecutionProxy* proxy = workerProxy(context);
     69     if (!proxy)
     70         return;
     71 
     72     v8::Handle<v8::Context> v8Context = proxy->context();
     73     if (v8Context.IsEmpty())
     74         return;
     75 
     76     // Enter the V8 context in which to perform the event handling.
     77     v8::Context::Scope scope(v8Context);
     78 
     79     // Get the V8 wrapper for the event object.
     80     v8::Handle<v8::Value> jsEvent = toV8(event);
     81 
     82     invokeEventHandler(context, event, jsEvent);
     83 }
     84 
     85 v8::Local<v8::Value> V8WorkerContextEventListener::callListenerFunction(ScriptExecutionContext* context, v8::Handle<v8::Value> jsEvent, Event* event)
     86 {
     87     v8::Local<v8::Function> handlerFunction = getListenerFunction(context);
     88     v8::Local<v8::Object> receiver = getReceiverObject(context, event);
     89     if (handlerFunction.IsEmpty() || receiver.IsEmpty())
     90         return v8::Local<v8::Value>();
     91 
     92     v8::Handle<v8::Value> parameters[1] = { jsEvent };
     93     v8::Local<v8::Value> result = handlerFunction->Call(receiver, 1, parameters);
     94 
     95     if (WorkerContextExecutionProxy* proxy = workerProxy(context))
     96         proxy->trackEvent(event);
     97 
     98     return result;
     99 }
    100 
    101 v8::Local<v8::Object> V8WorkerContextEventListener::getReceiverObject(ScriptExecutionContext* context, Event* event)
    102 {
    103     v8::Local<v8::Object> listener = getListenerObject(context);
    104 
    105     if (!listener.IsEmpty() && !listener->IsFunction())
    106         return listener;
    107 
    108     EventTarget* target = event->currentTarget();
    109     v8::Handle<v8::Value> value = V8DOMWrapper::convertEventTargetToV8Object(target);
    110     if (value.IsEmpty())
    111         return v8::Local<v8::Object>();
    112     return v8::Local<v8::Object>::New(v8::Handle<v8::Object>::Cast(value));
    113 }
    114 
    115 } // namespace WebCore
    116 
    117 #endif // WORKERS
    118