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/*
* Copyright (C) 2006, 2007, 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 "third_party/blink/renderer/bindings/core/v8/v8_event_listener.h"
#include "third_party/blink/renderer/bindings/core/v8/script_controller.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/events/event.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
namespace blink {
V8EventListener::V8EventListener(bool is_attribute, ScriptState* script_state)
: V8AbstractEventListener(script_state->GetIsolate(),
is_attribute,
script_state->World()) {}
v8::Local<v8::Function> V8EventListener::GetListenerFunction(
ScriptState* script_state) {
v8::Local<v8::Object> listener =
GetListenerObject(ExecutionContext::From(script_state));
// Has the listener been disposed?
if (listener.IsEmpty())
return v8::Local<v8::Function>();
if (listener->IsFunction())
return v8::Local<v8::Function>::Cast(listener);
// The EventHandler callback function type (used for event handler
// attributes in HTML) has [TreatNonObjectAsNull], which implies that
// non-function objects should be treated as no-op functions that return
// undefined.
if (IsAttribute())
return v8::Local<v8::Function>();
// Getting the handleEvent property can runs script in the getter.
if (ScriptForbiddenScope::IsScriptForbidden()) {
V8ThrowException::ThrowError(GetIsolate(),
"Script execution is forbidden.");
return v8::Local<v8::Function>();
}
if (listener->IsObject()) {
// Check that no exceptions were thrown when getting the
// handleEvent property and that the value is a function.
v8::Local<v8::Value> property;
if (listener
->Get(script_state->GetContext(),
V8AtomicString(GetIsolate(), "handleEvent"))
.ToLocal(&property) &&
property->IsFunction())
return v8::Local<v8::Function>::Cast(property);
}
return v8::Local<v8::Function>();
}
v8::Local<v8::Value> V8EventListener::CallListenerFunction(
ScriptState* script_state,
v8::Local<v8::Value> js_event,
Event* event) {
DCHECK(!js_event.IsEmpty());
v8::Local<v8::Function> handler_function = GetListenerFunction(script_state);
v8::Local<v8::Object> receiver = GetReceiverObject(script_state, event);
if (handler_function.IsEmpty() || receiver.IsEmpty())
return v8::Local<v8::Value>();
ExecutionContext* execution_context =
ToExecutionContext(script_state->GetContext());
if (!execution_context->IsDocument())
return v8::Local<v8::Value>();
LocalFrame* frame = ToDocument(execution_context)->GetFrame();
if (!frame)
return v8::Local<v8::Value>();
// TODO(jochen): Consider moving this check into canExecuteScripts.
// http://crbug.com/608641
if (script_state->World().IsMainWorld() &&
!execution_context->CanExecuteScripts(kAboutToExecuteScript))
return v8::Local<v8::Value>();
v8::Local<v8::Value> parameters[1] = {js_event};
v8::Local<v8::Value> result;
if (!V8ScriptRunner::CallFunction(handler_function, frame->GetDocument(),
receiver, base::size(parameters),
parameters, script_state->GetIsolate())
.ToLocal(&result))
return v8::Local<v8::Value>();
return result;
}
} // namespace blink
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