Source/WebKit/GPUProcess/media/RemoteCDMFactoryProxy.cpp

/*
 * Copyright (C) 2020-2022 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer in the
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 * 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 APPLE INC. OR ITS CONTRIBUTORS
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#include "config.h"
#include "RemoteCDMFactoryProxy.h"

#if ENABLE(GPU_PROCESS) && ENABLE(ENCRYPTED_MEDIA)

#include "GPUProcess.h"
#include "RemoteCDMConfiguration.h"
#include "RemoteCDMInstanceProxy.h"
#include "RemoteCDMInstanceSessionProxy.h"
#include "RemoteCDMProxy.h"
#include <WebCore/CDMFactory.h>
#include <wtf/Algorithms.h>

namespace WebKit {

using namespace WebCore;

RemoteCDMFactoryProxy::RemoteCDMFactoryProxy(GPUConnectionToWebProcess& connection)
    : m_gpuConnectionToWebProcess(connection)
{
}

RemoteCDMFactoryProxy::~RemoteCDMFactoryProxy() = default;

static CDMFactory* factoryForKeySystem(const String& keySystem)
{
    auto& factories = CDMFactory::registeredFactories();
    auto foundIndex = factories.findIf([&] (auto& factory) { return factory->supportsKeySystem(keySystem); });
    if (foundIndex == notFound)
        return nullptr;
    return factories[foundIndex];
}

void RemoteCDMFactoryProxy::createCDM(const String& keySystem, CompletionHandler<void(RemoteCDMIdentifier&&, RemoteCDMConfiguration&&)>&& completion)
{
    auto factory = factoryForKeySystem(keySystem);
    if (!factory) {
        completion({ }, { });
        return;
    }

    auto privateCDM = factory->createCDM(keySystem);
    if (!privateCDM) {
        completion({ }, { });
        return;
    }

    auto proxy = RemoteCDMProxy::create(*this, WTFMove(privateCDM));
    auto identifier = RemoteCDMIdentifier::generate();
    RemoteCDMConfiguration configuration = proxy->configuration();
    addProxy(identifier, WTFMove(proxy));
    completion(WTFMove(identifier), WTFMove(configuration));
}

void RemoteCDMFactoryProxy::supportsKeySystem(const String& keySystem, CompletionHandler<void(bool)>&& completion)
{
    completion(factoryForKeySystem(keySystem));
}

void RemoteCDMFactoryProxy::didReceiveCDMMessage(IPC::Connection& connection, IPC::Decoder& decoder)
{
    if (auto* proxy = m_proxies.get(makeObjectIdentifier<RemoteCDMIdentifierType>(decoder.destinationID())))
        proxy->didReceiveMessage(connection, decoder);
}

void RemoteCDMFactoryProxy::didReceiveCDMInstanceMessage(IPC::Connection& connection, IPC::Decoder& decoder)
{
    if (auto* instance = m_instances.get(makeObjectIdentifier<RemoteCDMInstanceIdentifierType>(decoder.destinationID())))
        instance->didReceiveMessage(connection, decoder);
}

void RemoteCDMFactoryProxy::didReceiveCDMInstanceSessionMessage(IPC::Connection& connection, IPC::Decoder& decoder)
{
    if (auto* session = m_sessions.get(makeObjectIdentifier<RemoteCDMInstanceSessionIdentifierType>(decoder.destinationID())))
        session->didReceiveMessage(connection, decoder);
}

bool RemoteCDMFactoryProxy::didReceiveSyncCDMMessage(IPC::Connection& connection, IPC::Decoder& decoder, UniqueRef<IPC::Encoder>& encoder)
{
    if (auto* proxy = m_proxies.get(makeObjectIdentifier<RemoteCDMIdentifierType>(decoder.destinationID())))
        return proxy->didReceiveSyncMessage(connection, decoder, encoder);
    return false;
}

bool RemoteCDMFactoryProxy::didReceiveSyncCDMInstanceMessage(IPC::Connection& connection, IPC::Decoder& decoder, UniqueRef<IPC::Encoder>& encoder)
{
    if (auto* instance = m_instances.get(makeObjectIdentifier<RemoteCDMInstanceIdentifierType>(decoder.destinationID())))
        return instance->didReceiveSyncMessage(connection, decoder, encoder);
    return false;
}

bool RemoteCDMFactoryProxy::didReceiveSyncCDMInstanceSessionMessage(IPC::Connection& connection, IPC::Decoder& decoder, UniqueRef<IPC::Encoder>& encoder)
{
    if (auto* session = m_sessions.get(makeObjectIdentifier<RemoteCDMInstanceSessionIdentifierType>(decoder.destinationID())))
        return session->didReceiveSyncMessage(connection, decoder, encoder);
    return false;
}

void RemoteCDMFactoryProxy::addProxy(const RemoteCDMIdentifier& identifier, std::unique_ptr<RemoteCDMProxy>&& proxy)
{
    ASSERT(!m_proxies.contains(identifier));
    m_proxies.set(identifier, WTFMove(proxy));
}

void RemoteCDMFactoryProxy::removeProxy(const RemoteCDMIdentifier& identifier)
{
    ASSERT(m_proxies.contains(identifier));
    m_proxies.remove(identifier);
}

void RemoteCDMFactoryProxy::addInstance(const RemoteCDMInstanceIdentifier& identifier, std::unique_ptr<RemoteCDMInstanceProxy>&& instance)
{
    ASSERT(!m_instances.contains(identifier));
    m_instances.set(identifier, WTFMove(instance));
}

void RemoteCDMFactoryProxy::removeInstance(const RemoteCDMInstanceIdentifier& identifier)
{
    ASSERT(m_instances.contains(identifier));
    m_instances.remove(identifier);
    if (m_gpuConnectionToWebProcess && allowsExitUnderMemoryPressure())
        m_gpuConnectionToWebProcess->gpuProcess().tryExitIfUnusedAndUnderMemoryPressure();
}

RemoteCDMInstanceProxy* RemoteCDMFactoryProxy::getInstance(const RemoteCDMInstanceIdentifier& identifier)
{
    return m_instances.get(identifier);
}

void RemoteCDMFactoryProxy::addSession(const RemoteCDMInstanceSessionIdentifier& identifier, std::unique_ptr<RemoteCDMInstanceSessionProxy>&& session)
{
    ASSERT(!m_sessions.contains(identifier));
    m_sessions.set(identifier, WTFMove(session));
}

void RemoteCDMFactoryProxy::removeSession(const RemoteCDMInstanceSessionIdentifier& identifier)
{
    ASSERT(m_sessions.contains(identifier));
    m_sessions.remove(identifier);
}

bool RemoteCDMFactoryProxy::allowsExitUnderMemoryPressure() const
{
    return m_instances.isEmpty();
}

}

#endif