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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 #include "config.h"
     32 #include "DateExtension.h"
     33 
     34 #include "V8Proxy.h"
     35 #include "V8HiddenPropertyName.h"
     36 
     37 namespace WebCore {
     38 
     39 DateExtension* DateExtension::extension;
     40 
     41 static const char* dateExtensionName = "v8/DateExtension";
     42 static const char* dateExtensionScript =
     43     "(function () {"
     44     "  var counter;"
     45     "  var orig_getTime;"
     46     "  function getTimeOverride() {"
     47     "    if (++counter > 1000)"
     48     "      OnSleepDetected();"
     49     "    return orig_getTime.call(this);"
     50     "  };"
     51     "  function enableSleepDetection(enable) {"
     52     "    if (enable) {"
     53     "      counter = 0;"
     54     "      orig_getTime = Date.prototype.getTime;"
     55     "      Date.prototype.getTime = getTimeOverride;"
     56     "    } else {"
     57     "      Date.prototype.getTime = orig_getTime;"
     58     "    }"
     59     "  };"
     60     "  native function Setup();"
     61     "  native function OnSleepDetected();"
     62     "  Setup(Date, enableSleepDetection);"
     63     "})()";
     64 
     65 DateExtension::DateExtension() : v8::Extension(dateExtensionName, dateExtensionScript)
     66 {
     67 }
     68 
     69 DateExtension* DateExtension::get()
     70 {
     71     if (!extension)
     72         extension = new DateExtension();
     73     return extension;
     74 }
     75 
     76 void DateExtension::setAllowSleep(bool allow)
     77 {
     78     v8::Local<v8::Value> result = V8Proxy::currentContext()->Global()->Get(v8::String::New("Date"));
     79     if (result.IsEmpty() || !result->IsObject())
     80         return;
     81 
     82     v8::Handle<v8::Object> dateObject = v8::Handle<v8::Object>::Cast(result);
     83     if (dateObject.IsEmpty())
     84         return;
     85 
     86     v8::Local<v8::Value> sleepFunctionHandle = dateObject->GetHiddenValue(V8HiddenPropertyName::sleepFunction());
     87     if (sleepFunctionHandle.IsEmpty() || !sleepFunctionHandle->IsFunction())
     88         return;
     89 
     90     v8::Handle<v8::Value> argv[1];
     91     argv[0] = v8::Boolean::New(!allow);
     92     v8::Handle<v8::Function>::Cast(sleepFunctionHandle)->Call(v8::Object::New(), 1, argv);
     93 }
     94 
     95 v8::Handle<v8::FunctionTemplate> DateExtension::GetNativeFunction(v8::Handle<v8::String> name)
     96 {
     97     if (name->Equals(v8::String::New("Setup")))
     98         return v8::FunctionTemplate::New(Setup);
     99     if (name->Equals(v8::String::New("OnSleepDetected")))
    100         return v8::FunctionTemplate::New(OnSleepDetected);
    101 
    102     return v8::Handle<v8::FunctionTemplate>();
    103 }
    104 
    105 v8::Handle<v8::Value> DateExtension::Setup(const v8::Arguments& args)
    106 {
    107     if (args.Length() != 2 || !args[0]->IsObject() || !args[1]->IsFunction())
    108         return v8::Undefined();
    109 
    110     v8::Handle<v8::Object> dateObject = v8::Handle<v8::Object>::Cast(args[0]);
    111     v8::Handle<v8::Function> enableSleepDetectionFunction = v8::Handle<v8::Function>::Cast(args[1]);
    112 
    113     dateObject->SetHiddenValue(V8HiddenPropertyName::sleepFunction(), enableSleepDetectionFunction);
    114     return v8::Undefined();
    115 }
    116 
    117 v8::Handle<v8::Value> DateExtension::OnSleepDetected(const v8::Arguments&)
    118 {
    119     V8Proxy::throwError(V8Proxy::GeneralError, "Too much time spent in unload handler.");
    120     return v8::Undefined();
    121 }
    122 
    123 }  // namespace WebCore
    124