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/*
* Copyright (C) 2008, 2009 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "V8Utilities.h"
#include <v8.h>
#include "Document.h"
#include "Frame.h"
#include "ScriptExecutionContext.h"
#include "ScriptState.h"
#include "V8Binding.h"
#include "V8Proxy.h"
#include "WorkerContext.h"
#include "WorkerContextExecutionProxy.h"
#include <wtf/Assertions.h>
#include "Frame.h"
namespace WebCore {
// Use an array to hold dependents. It works like a ref-counted scheme.
// A value can be added more than once to the DOM object.
void createHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
{
v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
if (cache->IsNull() || cache->IsUndefined()) {
cache = v8::Array::New();
object->SetInternalField(cacheIndex, cache);
}
v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
cacheArray->Set(v8::Integer::New(cacheArray->Length()), value);
}
void removeHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
{
v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
if (!cache->IsArray())
return;
v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
for (int i = cacheArray->Length() - 1; i >= 0; --i) {
v8::Local<v8::Value> cached = cacheArray->Get(v8::Integer::New(i));
if (cached->StrictEquals(value)) {
cacheArray->Delete(i);
return;
}
}
}
void transferHiddenDependency(v8::Handle<v8::Object> object,
EventListener* oldValue,
v8::Local<v8::Value> newValue,
int cacheIndex)
{
if (oldValue) {
V8AbstractEventListener* oldListener = V8AbstractEventListener::cast(oldValue);
if (oldListener) {
v8::Local<v8::Object> oldListenerObject = oldListener->getExistingListenerObject();
if (!oldListenerObject.IsEmpty())
removeHiddenDependency(object, oldListenerObject, cacheIndex);
}
}
if (!newValue->IsNull() && !newValue->IsUndefined())
createHiddenDependency(object, newValue, cacheIndex);
}
bool processingUserGesture()
{
Frame* frame = V8Proxy::retrieveFrameForEnteredContext();
return frame && frame->script()->processingUserGesture();
}
bool shouldAllowNavigation(Frame* frame)
{
Frame* callingFrame = V8Proxy::retrieveFrameForCallingContext();
return callingFrame && callingFrame->loader()->shouldAllowNavigation(frame);
}
KURL completeURL(const String& relativeURL)
{
// For histoical reasons, we need to complete the URL using the dynamic frame.
Frame* frame = V8Proxy::retrieveFrameForEnteredContext();
if (!frame)
return KURL();
return frame->loader()->completeURL(relativeURL);
}
void navigateIfAllowed(Frame* frame, const KURL& url, bool lockHistory, bool lockBackForwardList)
{
Frame* callingFrame = V8Proxy::retrieveFrameForCallingContext();
if (!callingFrame)
return;
if (!protocolIsJavaScript(url) || ScriptController::isSafeScript(frame))
frame->redirectScheduler()->scheduleLocationChange(url.string(), callingFrame->loader()->outgoingReferrer(), lockHistory, lockBackForwardList, processingUserGesture());
}
ScriptExecutionContext* getScriptExecutionContext(ScriptState* scriptState)
{
#if ENABLE(WORKERS)
WorkerContextExecutionProxy* proxy = WorkerContextExecutionProxy::retrieve();
if (proxy)
return proxy->workerContext()->scriptExecutionContext();
#endif
Frame* frame;
if (scriptState) {
v8::HandleScope handleScope;
frame = V8Proxy::retrieveFrame(scriptState->context());
} else
frame = V8Proxy::retrieveFrameForCurrentContext();
if (frame)
return frame->document()->scriptExecutionContext();
return 0;
}
void reportException(ScriptState* scriptState, v8::TryCatch& exceptionCatcher)
{
String errorMessage;
int lineNumber = 0;
String sourceURL;
// There can be a situation that an exception is thrown without setting a message.
v8::Local<v8::Message> message = exceptionCatcher.Message();
if (message.IsEmpty()) {
v8::Local<v8::String> exceptionString = exceptionCatcher.Exception()->ToString();
// Conversion of the exception object to string can fail if an
// exception is thrown during conversion.
if (!exceptionString.IsEmpty())
errorMessage = toWebCoreString(exceptionString);
} else {
errorMessage = toWebCoreString(message->Get());
lineNumber = message->GetLineNumber();
sourceURL = toWebCoreString(message->GetScriptResourceName());
}
// Do not report the exception if the current execution context is Document because we do not want to lead to duplicate error messages in the console.
// FIXME (31171): need better design to solve the duplicate error message reporting problem.
ScriptExecutionContext* context = getScriptExecutionContext(scriptState);
// During the frame teardown, there may not be a valid context.
if (context && !context->isDocument())
context->reportException(errorMessage, lineNumber, sourceURL);
exceptionCatcher.Reset();
}
} // namespace WebCore
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