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      1 /*
      2  * Copyright (C) 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 #ifndef DOMDataStore_h
     32 #define DOMDataStore_h
     33 
     34 #include "bindings/v8/DOMWrapperMap.h"
     35 #include "bindings/v8/DOMWrapperWorld.h"
     36 #include "bindings/v8/ScriptWrappable.h"
     37 #include "bindings/v8/WrapperTypeInfo.h"
     38 #include <v8.h>
     39 #include "wtf/Noncopyable.h"
     40 #include "wtf/StdLibExtras.h"
     41 
     42 namespace WebCore {
     43 
     44 class Node;
     45 
     46 class DOMDataStore {
     47     WTF_MAKE_NONCOPYABLE(DOMDataStore);
     48 public:
     49     explicit DOMDataStore(WrapperWorldType);
     50     ~DOMDataStore();
     51 
     52     static DOMDataStore& current(v8::Isolate*);
     53 
     54     template<typename V8T, typename T, typename Wrappable>
     55     static bool setReturnValueFromWrapperFast(v8::ReturnValue<v8::Value> returnValue, T* object, v8::Local<v8::Object> holder, Wrappable* wrappable)
     56     {
     57         // What we'd really like to check here is whether we're in the
     58         // main world or in an isolated world. The fastest way to do that
     59         // is to check that there is no isolated world and the 'object'
     60         // is an object that can exist in the main world. The second fastest
     61         // way is to check whether the wrappable's wrapper is the same as
     62         // the holder.
     63         if ((!DOMWrapperWorld::isolatedWorldsExist() && !canExistInWorker(object)) || holderContainsWrapper(holder, wrappable)) {
     64             if (ScriptWrappable::wrapperCanBeStoredInObject(object))
     65                 return ScriptWrappable::setReturnValueWithSecurityCheck<V8T>(returnValue, object);
     66             return mainWorldStore().m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
     67         }
     68         return current(returnValue.GetIsolate()).template setReturnValueFrom<V8T>(returnValue, object);
     69     }
     70 
     71     template<typename V8T, typename T>
     72     static bool setReturnValueFromWrapper(v8::ReturnValue<v8::Value> returnValue, T* object)
     73     {
     74         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && !canExistInWorker(object)) {
     75             if (LIKELY(!DOMWrapperWorld::isolatedWorldsExist()))
     76                 return ScriptWrappable::setReturnValueWithSecurityCheck<V8T>(returnValue, object);
     77         }
     78         return current(returnValue.GetIsolate()).template setReturnValueFrom<V8T>(returnValue, object);
     79     }
     80 
     81     template<typename V8T, typename T>
     82     static bool setReturnValueFromWrapperForMainWorld(v8::ReturnValue<v8::Value> returnValue, T* object)
     83     {
     84         if (ScriptWrappable::wrapperCanBeStoredInObject(object))
     85             return ScriptWrappable::setReturnValue(returnValue, object);
     86         return mainWorldStore().m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
     87     }
     88 
     89     template<typename V8T, typename T>
     90     static v8::Handle<v8::Object> getWrapper(T* object, v8::Isolate* isolate)
     91     {
     92         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && !canExistInWorker(object)) {
     93             if (LIKELY(!DOMWrapperWorld::isolatedWorldsExist())) {
     94                 v8::Handle<v8::Object> result = ScriptWrappable::getUnsafeWrapperFromObject(object).newLocal(isolate);
     95                 // Security: always guard against malicious tampering.
     96                 RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(result.IsEmpty() || result->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex) == V8T::toInternalPointer(object));
     97                 return result;
     98             }
     99         }
    100         return current(isolate).template get<V8T>(object, isolate);
    101     }
    102 
    103     template<typename V8T, typename T>
    104     static void setWrapperReference(const v8::Persistent<v8::Object>& parent, T* child, v8::Isolate* isolate)
    105     {
    106         if (ScriptWrappable::wrapperCanBeStoredInObject(child) && !canExistInWorker(child)) {
    107             if (LIKELY(!DOMWrapperWorld::isolatedWorldsExist())) {
    108                 UnsafePersistent<v8::Object> unsafePersistent = ScriptWrappable::getUnsafeWrapperFromObject(child);
    109                 // Security: always guard against malicious tampering.
    110                 RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(unsafePersistent.isEmpty() || unsafePersistent.value()->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex) == V8T::toInternalPointer(child));
    111                 unsafePersistent.setReferenceFrom(parent, isolate);
    112             }
    113         }
    114         current(isolate).template setReference<V8T>(parent, child, isolate);
    115     }
    116 
    117     template<typename V8T, typename T>
    118     static void setWrapper(T* object, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate, const WrapperConfiguration& configuration)
    119     {
    120         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && !canExistInWorker(object)) {
    121             if (LIKELY(!DOMWrapperWorld::isolatedWorldsExist())) {
    122                 ScriptWrappable::setWrapperInObject(object, wrapper, isolate, configuration);
    123                 return;
    124             }
    125         }
    126         return current(isolate).template set<V8T>(object, wrapper, isolate, configuration);
    127     }
    128 
    129     template<typename V8T, typename T>
    130     static bool containsWrapper(T* object, v8::Isolate* isolate)
    131     {
    132         return current(isolate).template containsWrapper<V8T>(object);
    133     }
    134 
    135     template<typename V8T, typename T>
    136     inline v8::Handle<v8::Object> get(T* object, v8::Isolate* isolate)
    137     {
    138         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && m_type == MainWorld)
    139             return ScriptWrappable::getUnsafeWrapperFromObject(object).newLocal(isolate);
    140         return m_wrapperMap.newLocal(V8T::toInternalPointer(object), isolate);
    141     }
    142 
    143     template<typename V8T, typename T>
    144     inline void setReference(const v8::Persistent<v8::Object>& parent, T* child, v8::Isolate* isolate)
    145     {
    146         if (ScriptWrappable::wrapperCanBeStoredInObject(child) && m_type == MainWorld) {
    147             ScriptWrappable::getUnsafeWrapperFromObject(child).setReferenceFrom(parent, isolate);
    148             return;
    149         }
    150         m_wrapperMap.setReference(parent, V8T::toInternalPointer(child), isolate);
    151     }
    152 
    153     template<typename V8T, typename T>
    154     inline bool setReturnValueFrom(v8::ReturnValue<v8::Value> returnValue, T* object)
    155     {
    156         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && m_type == MainWorld)
    157             return ScriptWrappable::setReturnValue(returnValue, object);
    158         return m_wrapperMap.setReturnValueFrom(returnValue, V8T::toInternalPointer(object));
    159     }
    160 
    161     template<typename V8T, typename T>
    162     inline bool containsWrapper(T* object)
    163     {
    164         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && m_type == MainWorld)
    165             return !ScriptWrappable::getUnsafeWrapperFromObject(object).isEmpty();
    166         return m_wrapperMap.containsKey(V8T::toInternalPointer(object));
    167     }
    168 
    169 private:
    170     template<typename V8T, typename T>
    171     inline void set(T* object, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate, const WrapperConfiguration& configuration)
    172     {
    173         ASSERT(!!object);
    174         ASSERT(!wrapper.IsEmpty());
    175         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && m_type == MainWorld) {
    176             ScriptWrappable::setWrapperInObject(object, wrapper, isolate, configuration);
    177             return;
    178         }
    179         m_wrapperMap.set(V8T::toInternalPointer(object), wrapper, configuration);
    180     }
    181 
    182     static DOMDataStore& mainWorldStore();
    183 
    184     static bool canExistInWorker(void*) { return true; }
    185     static bool canExistInWorker(Node*) { return false; }
    186 
    187     static bool holderContainsWrapper(v8::Local<v8::Object>, void*)
    188     {
    189         return false;
    190     }
    191 
    192     static bool holderContainsWrapper(v8::Local<v8::Object> holder, ScriptWrappable* wrappable)
    193     {
    194         // Verify our assumptions about the main world.
    195         UnsafePersistent<v8::Object> unsafePersistent = wrappable->unsafePersistent();
    196         ASSERT(unsafePersistent.isEmpty() || !(holder == *unsafePersistent.persistent()) || current(v8::Isolate::GetCurrent()).m_type == MainWorld);
    197         return holder == *unsafePersistent.persistent();
    198     }
    199 
    200     WrapperWorldType m_type;
    201     DOMWrapperMap<void> m_wrapperMap;
    202 };
    203 
    204 } // namespace WebCore
    205 
    206 #endif // DOMDataStore_h
    207