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/*
* Copyright (C) 2021-2022 Igalia S.L. All rights reserved.
* Copyright (C) 2022 Metrological Group B.V.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "GStreamerDtlsTransportBackend.h"
#if ENABLE(WEB_RTC) && USE(GSTREAMER_WEBRTC)
#include "GStreamerIceTransportBackend.h"
#include "GStreamerWebRTCUtils.h"
#include <JavaScriptCore/ArrayBuffer.h>
#include <wtf/glib/GUniquePtr.h>
namespace WebCore {
GST_DEBUG_CATEGORY(webkit_webrtc_dtls_transport_debug);
#define GST_CAT_DEFAULT webkit_webrtc_dtls_transport_debug
class GStreamerDtlsTransportBackendObserver final : public ThreadSafeRefCounted<GStreamerDtlsTransportBackendObserver> {
public:
static Ref<GStreamerDtlsTransportBackendObserver> create(RTCDtlsTransportBackendClient& client, GRefPtr<GstWebRTCDTLSTransport>&& backend) { return adoptRef(*new GStreamerDtlsTransportBackendObserver(client, WTFMove(backend))); }
void start();
void stop();
private:
GStreamerDtlsTransportBackendObserver(RTCDtlsTransportBackendClient&, GRefPtr<GstWebRTCDTLSTransport>&&);
void stateChanged();
GRefPtr<GstWebRTCDTLSTransport> m_backend;
WeakPtr<RTCDtlsTransportBackendClient> m_client;
};
GStreamerDtlsTransportBackendObserver::GStreamerDtlsTransportBackendObserver(RTCDtlsTransportBackendClient& client, GRefPtr<GstWebRTCDTLSTransport>&& backend)
: m_backend(WTFMove(backend))
, m_client(client)
{
ASSERT(m_backend);
}
void GStreamerDtlsTransportBackendObserver::stateChanged()
{
if (!m_client)
return;
callOnMainThread([this, protectedThis = Ref { *this }]() mutable {
if (!m_client || !m_backend)
return;
GstWebRTCDTLSTransportState state;
g_object_get(m_backend.get(), "state", &state, nullptr);
#ifndef GST_DISABLE_GST_DEBUG
GUniquePtr<char> desc(g_enum_to_string(GST_TYPE_WEBRTC_DTLS_TRANSPORT_STATE, state));
GST_DEBUG_OBJECT(m_backend.get(), "DTLS transport state changed to %s", desc.get());
#endif
Vector<Ref<JSC::ArrayBuffer>> certificates;
// Access to DTLS certificates is not memory-safe in GStreamer versions older than 1.22.3.
// See also: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/d9c853f165288071b63af9a56b6d76e358fbdcc2
if (webkitGstCheckVersion(1, 22, 3)) {
GUniqueOutPtr<char> remoteCertificate;
GUniqueOutPtr<char> certificate;
g_object_get(m_backend.get(), "remote-certificate", &remoteCertificate.outPtr(), "certificate", &certificate.outPtr(), nullptr);
if (remoteCertificate)
certificates.append(JSC::ArrayBuffer::create(unsafeSpan8(remoteCertificate.get())));
if (certificate)
certificates.append(JSC::ArrayBuffer::create(unsafeSpan8(certificate.get())));
}
m_client->onStateChanged(toRTCDtlsTransportState(state), WTFMove(certificates));
});
}
void GStreamerDtlsTransportBackendObserver::start()
{
g_signal_connect_swapped(m_backend.get(), "notify::state", G_CALLBACK(+[](GStreamerDtlsTransportBackendObserver* observer) {
observer->stateChanged();
}), this);
}
void GStreamerDtlsTransportBackendObserver::stop()
{
m_client = nullptr;
g_signal_handlers_disconnect_by_data(m_backend.get(), this);
}
GStreamerDtlsTransportBackend::GStreamerDtlsTransportBackend(GRefPtr<GstWebRTCDTLSTransport>&& transport)
: m_backend(WTFMove(transport))
{
static std::once_flag debugRegisteredFlag;
std::call_once(debugRegisteredFlag, [] {
GST_DEBUG_CATEGORY_INIT(webkit_webrtc_dtls_transport_debug, "webkitwebrtcdtls", 0, "WebKit WebRTC DTLS Transport");
});
ASSERT(m_backend);
ASSERT(isMainThread());
}
GStreamerDtlsTransportBackend::~GStreamerDtlsTransportBackend()
{
unregisterClient();
}
UniqueRef<RTCIceTransportBackend> GStreamerDtlsTransportBackend::iceTransportBackend()
{
return makeUniqueRef<GStreamerIceTransportBackend>(GRefPtr<GstWebRTCDTLSTransport>(m_backend));
}
void GStreamerDtlsTransportBackend::registerClient(RTCDtlsTransportBackendClient& client)
{
m_observer = GStreamerDtlsTransportBackendObserver::create(client, GRefPtr<GstWebRTCDTLSTransport>(m_backend));
m_observer->start();
}
void GStreamerDtlsTransportBackend::unregisterClient()
{
if (m_observer)
m_observer->stop();
}
#undef GST_CAT_DEFAULT
} // namespace WebCore
#endif // ENABLE(WEB_RTC) && USE(GSTREAMER_WEBRTC)
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