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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "modules/navigatorconnect/NavigatorConnect.h"
#include "bindings/core/v8/ScriptPromiseResolver.h"
#include "core/dom/DOMException.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/MessageChannel.h"
#include "core/dom/MessagePort.h"
#include "public/platform/Platform.h"
#include "public/platform/WebNavigatorConnectProvider.h"
namespace blink {
namespace {
class ConnectCallbacks : public WebNavigatorConnectCallbacks {
public:
ConnectCallbacks(PassRefPtrWillBeRawPtr<ScriptPromiseResolver> resolver, PassRefPtrWillBeRawPtr<MessagePort> port)
: m_resolver(resolver), m_port(port)
{
ASSERT(m_resolver);
}
~ConnectCallbacks() override { }
void onSuccess() override
{
if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped()) {
return;
}
m_resolver->resolve(m_port);
}
void onError() override
{
if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped()) {
return;
}
m_resolver->reject(DOMException::create(AbortError));
}
private:
RefPtrWillBePersistent<ScriptPromiseResolver> m_resolver;
RefPtrWillBePersistent<MessagePort> m_port;
WTF_MAKE_NONCOPYABLE(ConnectCallbacks);
};
} // namespace
ScriptPromise NavigatorConnect::connect(ScriptState* scriptState, const String& url)
{
WebNavigatorConnectProvider* provider = Platform::current()->navigatorConnectProvider();
if (!provider)
return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(NotSupportedError));
RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
ScriptPromise promise = resolver->promise();
// Create a new MessageChannel, but immediately disentangle port2 (extract
// the WebMessagePortChannel from the port and mark it as being transfered).
// This way we have:
// - Ownership of port1 is kept in the ConnectCallbacks and later passed to
// javascript (or released if the connection is not accepted).
// - Ownership of port2 (or more precisely the WebMessagePortChannel backing
// it) is passed to the content layer to be transfered to the service
// provider.
// - Ownership of the MessageChannel object itself will be released at the
// end of this method. This is okay as it's the ports themselves that
// represent the actual message channel. MessageChannel is only used to
// create a pair of ports.
RefPtrWillBeRawPtr<MessageChannel> channel(MessageChannel::create(scriptState->executionContext()));
OwnPtr<WebMessagePortChannel> webchannel = channel->port2()->disentangle();
provider->connect(
scriptState->executionContext()->completeURL(url),
scriptState->executionContext()->securityOrigin()->toString(),
webchannel.leakPtr(),
new ConnectCallbacks(resolver, channel->port1()));
return promise;
}
} // namespace blink
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