Source/WebCore/crypto/CryptoAlgorithmRegistry.cpp

/*
 * Copyright (C) 2013 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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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS CONTRIBUTORS
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#include "config.h"
#include "CryptoAlgorithmRegistry.h"

#if ENABLE(WEB_CRYPTO)

#include "CryptoAlgorithm.h"
#include <wtf/Lock.h>
#include <wtf/NeverDestroyed.h>

namespace WebCore {

static Lock registryMutex;

CryptoAlgorithmRegistry& CryptoAlgorithmRegistry::singleton()
{
    static NeverDestroyed<CryptoAlgorithmRegistry> registry;
    return registry;
}

CryptoAlgorithmRegistry::CryptoAlgorithmRegistry()
{
    platformRegisterAlgorithms();
}

Optional<CryptoAlgorithmIdentifier> CryptoAlgorithmRegistry::identifier(const String& name)
{
    if (name.isEmpty())
        return WTF::nullopt;

    std::lock_guard<Lock> lock(registryMutex);

    // FIXME: How is it helpful to call isolatedCopy on the argument to find?
    auto identifier = m_identifiers.find(name.isolatedCopy());
    if (identifier == m_identifiers.end())
        return WTF::nullopt;

    return identifier->value;
}

String CryptoAlgorithmRegistry::name(CryptoAlgorithmIdentifier identifier)
{
    std::lock_guard<Lock> lock(registryMutex);

    auto contructor = m_constructors.find(static_cast<unsigned>(identifier));
    if (contructor == m_constructors.end())
        return { };

    return contructor->value.first.isolatedCopy();
}

RefPtr<CryptoAlgorithm> CryptoAlgorithmRegistry::create(CryptoAlgorithmIdentifier identifier)
{
    std::lock_guard<Lock> lock(registryMutex);

    auto contructor = m_constructors.find(static_cast<unsigned>(identifier));
    if (contructor == m_constructors.end())
        return nullptr;

    return contructor->value.second();
}

void CryptoAlgorithmRegistry::registerAlgorithm(const String& name, CryptoAlgorithmIdentifier identifier, CryptoAlgorithmConstructor constructor)
{
    std::lock_guard<Lock> lock(registryMutex);

    ASSERT(!m_identifiers.contains(name));
    ASSERT(!m_constructors.contains(static_cast<unsigned>(identifier)));

    m_identifiers.add(name, identifier);
    m_constructors.add(static_cast<unsigned>(identifier), std::make_pair(name, constructor));
}


} // namespace WebCore

#endif // ENABLE(WEB_CRYPTO)