Source/WebKit/GPUProcess/media/RemoteLegacyCDMSessionProxy.cpp

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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#include "config.h"
#include "RemoteLegacyCDMSessionProxy.h"

#if ENABLE(GPU_PROCESS) && ENABLE(LEGACY_ENCRYPTED_MEDIA)

#include "GPUConnectionToWebProcess.h"
#include "RemoteLegacyCDMFactoryProxy.h"
#include "RemoteLegacyCDMSessionMessages.h"
#include "SharedBufferCopy.h"
#include <JavaScriptCore/GenericTypedArrayViewInlines.h>
#include <WebCore/LegacyCDM.h>
#include <WebCore/SharedBuffer.h>

namespace WebKit {

using namespace WebCore;

std::unique_ptr<RemoteLegacyCDMSessionProxy> RemoteLegacyCDMSessionProxy::create(WeakPtr<RemoteLegacyCDMFactoryProxy>&& factory, RemoteLegacyCDMSessionIdentifier identifier, WebCore::LegacyCDM& cdm)
{
    return std::unique_ptr<RemoteLegacyCDMSessionProxy>(new RemoteLegacyCDMSessionProxy(WTFMove(factory), identifier, cdm));
}

RemoteLegacyCDMSessionProxy::RemoteLegacyCDMSessionProxy(WeakPtr<RemoteLegacyCDMFactoryProxy>&& factory, RemoteLegacyCDMSessionIdentifier identifier, WebCore::LegacyCDM& cdm)
    : m_factory(WTFMove(factory))
    , m_identifier(identifier)
    , m_session(cdm.createSession(*this))
{
}

RemoteLegacyCDMSessionProxy::~RemoteLegacyCDMSessionProxy() = default;

static RefPtr<Uint8Array> convertToUint8Array(IPC::SharedBufferCopy&& buffer)
{
    if (!buffer.buffer())
        return nullptr;

    size_t sizeInBytes = buffer.size();
    auto arrayBuffer = ArrayBuffer::create(buffer.data(), sizeInBytes);
    return Uint8Array::create(WTFMove(arrayBuffer), 0, sizeInBytes);
}

template <typename T>
static std::optional<IPC::SharedBufferCopy> convertToOptionalDataReference(T array)
{
    if (!array)
        return std::nullopt;
    return { SharedBuffer::create((const char*)array->data(), array->byteLength()) };
}

void RemoteLegacyCDMSessionProxy::generateKeyRequest(const String& mimeType, IPC::SharedBufferCopy&& initData, GenerateKeyCallback&& completion)
{
    auto initDataArray = convertToUint8Array(WTFMove(initData));
    if (!initDataArray) {
        completion({ }, emptyString(), 0, 0);
        return;
    }

    String destinationURL;
    unsigned short errorCode { 0 };
    uint32_t systemCode { 0 };

    auto keyRequest = m_session->generateKeyRequest(mimeType, initDataArray.get(), destinationURL, errorCode, systemCode);

    destinationURL = "this is a test string"_s;

    completion(convertToOptionalDataReference(keyRequest), destinationURL, errorCode, systemCode);
}

void RemoteLegacyCDMSessionProxy::releaseKeys()
{
    m_session->releaseKeys();
}

void RemoteLegacyCDMSessionProxy::update(IPC::SharedBufferCopy&& update, UpdateCallback&& completion)
{
    auto updateArray = convertToUint8Array(WTFMove(update));
    if (!updateArray) {
        completion(false, std::nullopt, 0, 0);
        return;
    }

    RefPtr<Uint8Array> nextMessage;
    unsigned short errorCode { 0 };
    uint32_t systemCode { 0 };

    bool succeeded = m_session->update(updateArray.get(), nextMessage, errorCode, systemCode);

    completion(succeeded, convertToOptionalDataReference(nextMessage), errorCode, systemCode);
}

RefPtr<ArrayBuffer> RemoteLegacyCDMSessionProxy::getCachedKeyForKeyId(const String& keyId)
{
    return m_session->cachedKeyForKeyID(keyId);
}

void RemoteLegacyCDMSessionProxy::cachedKeyForKeyID(String keyId, CachedKeyForKeyIDCallback&& completion)
{
    completion(convertToOptionalDataReference(getCachedKeyForKeyId(keyId)));
}

void RemoteLegacyCDMSessionProxy::sendMessage(Uint8Array* message, String destinationURL)
{
    if (!m_factory)
        return;

    auto* gpuConnectionToWebProcess = m_factory->gpuConnectionToWebProcess();
    if (!gpuConnectionToWebProcess)
        return;

    gpuConnectionToWebProcess->connection().send(Messages::RemoteLegacyCDMSession::SendMessage(convertToOptionalDataReference(message), destinationURL), m_identifier);
}

void RemoteLegacyCDMSessionProxy::sendError(MediaKeyErrorCode errorCode, uint32_t systemCode)
{
    if (!m_factory)
        return;

    auto* gpuConnectionToWebProcess = m_factory->gpuConnectionToWebProcess();
    if (!gpuConnectionToWebProcess)
        return;

    gpuConnectionToWebProcess->connection().send(Messages::RemoteLegacyCDMSession::SendError(errorCode, systemCode), m_identifier);
}

String RemoteLegacyCDMSessionProxy::mediaKeysStorageDirectory() const
{
    if (!m_factory)
        return emptyString();

    auto* gpuConnectionToWebProcess = m_factory->gpuConnectionToWebProcess();
    if (!gpuConnectionToWebProcess)
        return emptyString();

    return gpuConnectionToWebProcess->mediaKeysStorageDirectory();
}

}

#endif