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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
      6  * are met:
      7  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "IDBBindingUtilities.h"
     28 
     29 #if ENABLE(INDEXED_DATABASE)
     30 
     31 #include "IDBDatabaseException.h"
     32 #include "IDBKey.h"
     33 #include "IDBKeyPath.h"
     34 #include "SerializedScriptValue.h"
     35 #include "V8Binding.h"
     36 #include "V8IDBKey.h"
     37 #include <wtf/Vector.h>
     38 
     39 namespace WebCore {
     40 
     41 PassRefPtr<IDBKey> createIDBKeyFromValue(v8::Handle<v8::Value> value)
     42 {
     43     if (value->IsNull())
     44         return IDBKey::createNull();
     45     if (value->IsNumber())
     46         return IDBKey::createNumber(value->NumberValue());
     47     if (value->IsString())
     48         return IDBKey::createString(v8ValueToWebCoreString(value));
     49     if (value->IsDate())
     50         return IDBKey::createDate(value->NumberValue());
     51 
     52     return 0; // Signals type error.
     53 }
     54 
     55 namespace {
     56 
     57 template<typename T>
     58 bool getValueFrom(T indexOrName, v8::Handle<v8::Value>& v8Value)
     59 {
     60     v8::Local<v8::Object> object = v8Value->ToObject();
     61     if (!object->Has(indexOrName))
     62         return false;
     63     v8Value = object->Get(indexOrName);
     64     return true;
     65 }
     66 
     67 template<typename T>
     68 bool setValue(v8::Handle<v8::Value>& v8Object, T indexOrName, const v8::Handle<v8::Value>& v8Value)
     69 {
     70     v8::Local<v8::Object> object = v8Object->ToObject();
     71     ASSERT(!object->Has(indexOrName));
     72     return object->Set(indexOrName, v8Value);
     73 }
     74 
     75 bool get(v8::Handle<v8::Value>& object, const IDBKeyPathElement& keyPathElement)
     76 {
     77     switch (keyPathElement.type) {
     78     case IDBKeyPathElement::IsIndexed:
     79         return object->IsArray() && getValueFrom(keyPathElement.index, object);
     80     case IDBKeyPathElement::IsNamed:
     81         return object->IsObject() && getValueFrom(v8String(keyPathElement.identifier), object);
     82     default:
     83         ASSERT_NOT_REACHED();
     84     }
     85     return false;
     86 }
     87 
     88 bool set(v8::Handle<v8::Value>& object, const IDBKeyPathElement& keyPathElement, const v8::Handle<v8::Value>& v8Value)
     89 {
     90     switch (keyPathElement.type) {
     91     case IDBKeyPathElement::IsIndexed:
     92         return object->IsArray() && setValue(object, keyPathElement.index, v8Value);
     93     case IDBKeyPathElement::IsNamed:
     94         return object->IsObject() && setValue(object, v8String(keyPathElement.identifier), v8Value);
     95     default:
     96         ASSERT_NOT_REACHED();
     97     }
     98     return false;
     99 }
    100 
    101 class LocalContext {
    102 public:
    103     LocalContext()
    104         : m_context(v8::Context::New())
    105     {
    106         m_context->Enter();
    107     }
    108 
    109     ~LocalContext()
    110     {
    111         m_context->Exit();
    112         m_context.Dispose();
    113     }
    114 
    115 private:
    116     v8::HandleScope m_scope;
    117     v8::Persistent<v8::Context> m_context;
    118 };
    119 
    120 v8::Handle<v8::Value> getNthValueOnKeyPath(v8::Handle<v8::Value>& rootValue, const Vector<IDBKeyPathElement>& keyPathElements, size_t index)
    121 {
    122     v8::Handle<v8::Value> currentValue(rootValue);
    123 
    124     ASSERT(index <= keyPathElements.size());
    125     for (size_t i = 0; i < index; ++i) {
    126         if (!get(currentValue, keyPathElements[i]))
    127             return v8::Handle<v8::Value>();
    128     }
    129 
    130     return currentValue;
    131 }
    132 
    133 } // anonymous namespace
    134 
    135 PassRefPtr<IDBKey> createIDBKeyFromSerializedValueAndKeyPath(PassRefPtr<SerializedScriptValue> value, const Vector<IDBKeyPathElement>& keyPath)
    136 {
    137     LocalContext localContext;
    138     v8::Handle<v8::Value> v8Value(value->deserialize());
    139     v8::Handle<v8::Value> v8Key(getNthValueOnKeyPath(v8Value, keyPath, keyPath.size()));
    140     if (v8Key.IsEmpty())
    141         return 0;
    142     return createIDBKeyFromValue(v8Key);
    143 }
    144 
    145 PassRefPtr<SerializedScriptValue> injectIDBKeyIntoSerializedValue(PassRefPtr<IDBKey> key, PassRefPtr<SerializedScriptValue> value, const Vector<IDBKeyPathElement>& keyPath)
    146 {
    147     LocalContext localContext;
    148     if (!keyPath.size())
    149         return 0;
    150 
    151     v8::Handle<v8::Value> v8Value(value->deserialize());
    152     v8::Handle<v8::Value> parent(getNthValueOnKeyPath(v8Value, keyPath, keyPath.size() - 1));
    153     if (parent.IsEmpty())
    154         return 0;
    155 
    156     if (!set(parent, keyPath.last(), toV8(key.get())))
    157         return 0;
    158 
    159     return SerializedScriptValue::create(v8Value);
    160 }
    161 
    162 } // namespace WebCore
    163 
    164 #endif
    165