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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 
workerProxy(ScriptExecutionContext * context)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 
V8WorkerContextEventListener(v8::Local<v8::Object> listener,bool isInline,const WorldContextHandle & worldContext)52 V8WorkerContextEventListener::V8WorkerContextEventListener(v8::Local<v8::Object> listener, bool isInline, const WorldContextHandle& worldContext)
53     : V8EventListener(listener, isInline, worldContext)
54 {
55 }
56 
handleEvent(ScriptExecutionContext * context,Event * event)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 
callListenerFunction(ScriptExecutionContext * context,v8::Handle<v8::Value> jsEvent,Event * event)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 
getReceiverObject(ScriptExecutionContext * context,Event * event)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