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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 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 "core/inspector/ScriptArguments.h"
     33 
     34 #include "bindings/core/v8/ScriptValue.h"
     35 #include "bindings/core/v8/V8Binding.h"
     36 #include "wtf/text/StringBuilder.h"
     37 #include <v8.h>
     38 
     39 namespace blink {
     40 
     41 namespace {
     42 
     43 static const unsigned maxArrayItemsLimit = 10000;
     44 static const unsigned maxStackDepthLimit = 32;
     45 
     46 class V8ValueStringBuilder {
     47 public:
     48     static String toString(v8::Handle<v8::Value> value, v8::Isolate* isolate)
     49     {
     50         V8ValueStringBuilder builder(isolate);
     51         if (!builder.append(value))
     52             return String();
     53         return builder.toString();
     54     }
     55 
     56 private:
     57     enum {
     58         IgnoreNull = 1 << 0,
     59         IgnoreUndefined = 1 << 1,
     60     };
     61 
     62     V8ValueStringBuilder(v8::Isolate* isolate)
     63         : m_arrayLimit(maxArrayItemsLimit)
     64         , m_isolate(isolate)
     65     {
     66     }
     67 
     68     bool append(v8::Handle<v8::Value> value, unsigned ignoreOptions = 0)
     69     {
     70         if (value.IsEmpty())
     71             return true;
     72         if ((ignoreOptions & IgnoreNull) && value->IsNull())
     73             return true;
     74         if ((ignoreOptions & IgnoreUndefined) && value->IsUndefined())
     75             return true;
     76         if (value->IsString())
     77             return append(v8::Handle<v8::String>::Cast(value));
     78         if (value->IsStringObject())
     79             return append(v8::Handle<v8::StringObject>::Cast(value)->ValueOf());
     80         if (value->IsSymbol())
     81             return append(v8::Handle<v8::Symbol>::Cast(value));
     82         if (value->IsSymbolObject())
     83             return append(v8::Handle<v8::SymbolObject>::Cast(value)->ValueOf());
     84         if (value->IsNumberObject()) {
     85             m_builder.appendNumber(v8::Handle<v8::NumberObject>::Cast(value)->ValueOf());
     86             return true;
     87         }
     88         if (value->IsBooleanObject()) {
     89             m_builder.append(v8::Handle<v8::BooleanObject>::Cast(value)->ValueOf() ? "true" : "false");
     90             return true;
     91         }
     92         if (value->IsArray())
     93             return append(v8::Handle<v8::Array>::Cast(value));
     94         if (toDOMWindow(value, m_isolate)) {
     95             m_builder.append("[object Window]");
     96             return true;
     97         }
     98         if (value->IsObject()
     99             && !value->IsDate()
    100             && !value->IsFunction()
    101             && !value->IsNativeError()
    102             && !value->IsRegExp())
    103             return append(v8::Handle<v8::Object>::Cast(value)->ObjectProtoToString());
    104         return append(value->ToString());
    105     }
    106 
    107     bool append(v8::Handle<v8::Array> array)
    108     {
    109         if (m_visitedArrays.contains(array))
    110             return true;
    111         uint32_t length = array->Length();
    112         if (length > m_arrayLimit)
    113             return false;
    114         if (m_visitedArrays.size() > maxStackDepthLimit)
    115             return false;
    116 
    117         bool result = true;
    118         m_arrayLimit -= length;
    119         m_visitedArrays.append(array);
    120         for (uint32_t i = 0; i < length; ++i) {
    121             if (i)
    122                 m_builder.append(',');
    123             if (!append(array->Get(i), IgnoreNull | IgnoreUndefined)) {
    124                 result = false;
    125                 break;
    126             }
    127         }
    128         m_visitedArrays.removeLast();
    129         return result;
    130     }
    131 
    132     bool append(v8::Handle<v8::Symbol> symbol)
    133     {
    134         m_builder.appendLiteral("Symbol(");
    135         bool result = append(symbol->Name(), IgnoreUndefined);
    136         m_builder.append(')');
    137         return result;
    138     }
    139 
    140     bool append(v8::Handle<v8::String> string)
    141     {
    142         if (m_tryCatch.HasCaught())
    143             return false;
    144         if (!string.IsEmpty())
    145             m_builder.append(toCoreString(string));
    146         return true;
    147     }
    148 
    149     String toString()
    150     {
    151         if (m_tryCatch.HasCaught())
    152             return String();
    153         return m_builder.toString();
    154     }
    155 
    156     uint32_t m_arrayLimit;
    157     v8::Isolate* m_isolate;
    158     StringBuilder m_builder;
    159     Vector<v8::Handle<v8::Array> > m_visitedArrays;
    160     v8::TryCatch m_tryCatch;
    161 };
    162 
    163 } // namespace
    164 
    165 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(ScriptArguments)
    166 
    167 PassRefPtrWillBeRawPtr<ScriptArguments> ScriptArguments::create(ScriptState* scriptState, Vector<ScriptValue>& arguments)
    168 {
    169     return adoptRefWillBeNoop(new ScriptArguments(scriptState, arguments));
    170 }
    171 
    172 ScriptArguments::ScriptArguments(ScriptState* scriptState, Vector<ScriptValue>& arguments)
    173     : m_scriptState(scriptState)
    174 {
    175     m_arguments.swap(arguments);
    176 }
    177 
    178 const ScriptValue &ScriptArguments::argumentAt(size_t index) const
    179 {
    180     ASSERT(m_arguments.size() > index);
    181     return m_arguments[index];
    182 }
    183 
    184 bool ScriptArguments::getFirstArgumentAsString(String& result, bool checkForNullOrUndefined)
    185 {
    186     if (!argumentCount())
    187         return false;
    188 
    189     const ScriptValue& value = argumentAt(0);
    190     ScriptState::Scope scope(m_scriptState.get());
    191     if (checkForNullOrUndefined && (value.isNull() || value.isUndefined()))
    192         return false;
    193 
    194     result = V8ValueStringBuilder::toString(value.v8Value(), value.isolate());
    195     return true;
    196 }
    197 
    198 } // namespace blink
    199