1/*
2 * Copyright (C) 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#include "bindings/v8/V8Utilities.h"
33
34#include "V8MessagePort.h"
35#include "bindings/v8/ScriptState.h"
36#include "bindings/v8/V8AbstractEventListener.h"
37#include "bindings/v8/V8Binding.h"
38#include "bindings/v8/custom/V8ArrayBufferCustom.h"
39#include "core/dom/Document.h"
40#include "core/dom/ExceptionCode.h"
41#include "core/dom/MessagePort.h"
42#include "core/dom/ScriptExecutionContext.h"
43#include "core/page/Frame.h"
44#include "core/workers/WorkerGlobalScope.h"
45#include "wtf/ArrayBuffer.h"
46#include "wtf/text/WTFString.h"
47#include <v8.h>
48
49
50namespace WebCore {
51
52// Use an array to hold dependents. It works like a ref-counted scheme.
53// A value can be added more than once to the DOM object.
54void createHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex, v8::Isolate* isolate)
55{
56    v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
57    if (cache->IsNull() || cache->IsUndefined()) {
58        cache = v8::Array::New();
59        object->SetInternalField(cacheIndex, cache);
60    }
61
62    v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
63    cacheArray->Set(v8::Integer::New(cacheArray->Length(), isolate), value);
64}
65
66bool extractTransferables(v8::Local<v8::Value> value, MessagePortArray& ports, ArrayBufferArray& arrayBuffers, v8::Isolate* isolate)
67{
68    if (isUndefinedOrNull(value)) {
69        ports.resize(0);
70        arrayBuffers.resize(0);
71        return true;
72    }
73
74    uint32_t length = 0;
75    if (value->IsArray()) {
76        v8::Local<v8::Array> array = v8::Local<v8::Array>::Cast(value);
77        length = array->Length();
78    } else {
79        if (toV8Sequence(value, length, isolate).IsEmpty())
80            return false;
81    }
82
83    v8::Local<v8::Object> transferrables = v8::Local<v8::Object>::Cast(value);
84
85    // Validate the passed array of transferrables.
86    for (unsigned int i = 0; i < length; ++i) {
87        v8::Local<v8::Value> transferrable = transferrables->Get(i);
88        // Validation of non-null objects, per HTML5 spec 10.3.3.
89        if (isUndefinedOrNull(transferrable)) {
90            setDOMException(DataCloneError, isolate);
91            return false;
92        }
93        // Validation of Objects implementing an interface, per WebIDL spec 4.1.15.
94        if (V8MessagePort::HasInstance(transferrable, isolate, worldType(isolate))) {
95            RefPtr<MessagePort> port = V8MessagePort::toNative(v8::Handle<v8::Object>::Cast(transferrable));
96            // Check for duplicate MessagePorts.
97            if (ports.contains(port)) {
98                setDOMException(DataCloneError, isolate);
99                return false;
100            }
101            ports.append(port.release());
102        } else if (V8ArrayBuffer::HasInstance(transferrable, isolate, worldType(isolate)))
103            arrayBuffers.append(V8ArrayBuffer::toNative(v8::Handle<v8::Object>::Cast(transferrable)));
104        else {
105            setDOMException(DataCloneError, isolate);
106            return false;
107        }
108    }
109    return true;
110}
111
112bool getMessagePortArray(v8::Local<v8::Value> value, MessagePortArray& ports, v8::Isolate* isolate)
113{
114    if (isUndefinedOrNull(value)) {
115        ports.resize(0);
116        return true;
117    }
118    if (!value->IsArray()) {
119        throwTypeError(isolate);
120        return false;
121    }
122    bool success = false;
123    ports = toRefPtrNativeArray<MessagePort, V8MessagePort>(value, isolate, &success);
124    return success;
125}
126
127void removeHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex, v8::Isolate* isolate)
128{
129    v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
130    if (!cache->IsArray())
131        return;
132    v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
133    for (int i = cacheArray->Length() - 1; i >= 0; --i) {
134        v8::Local<v8::Value> cached = cacheArray->Get(v8::Integer::New(i, isolate));
135        if (cached->StrictEquals(value)) {
136            cacheArray->Delete(i);
137            return;
138        }
139    }
140}
141
142void transferHiddenDependency(v8::Handle<v8::Object> object, EventListener* oldValue, v8::Local<v8::Value> newValue, int cacheIndex, v8::Isolate* isolate)
143{
144    if (oldValue) {
145        V8AbstractEventListener* oldListener = V8AbstractEventListener::cast(oldValue);
146        if (oldListener) {
147            v8::Local<v8::Object> oldListenerObject = oldListener->getExistingListenerObject();
148            if (!oldListenerObject.IsEmpty())
149                removeHiddenDependency(object, oldListenerObject, cacheIndex, isolate);
150        }
151    }
152    if (!newValue->IsNull() && !newValue->IsUndefined())
153        createHiddenDependency(object, newValue, cacheIndex, isolate);
154}
155
156ScriptExecutionContext* getScriptExecutionContext()
157{
158    if (WorkerScriptController* controller = WorkerScriptController::controllerForContext())
159        return controller->workerGlobalScope();
160
161    return currentDocument();
162}
163
164} // namespace WebCore
165