/*
 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 *
 */

#include "config.h"
#include "NavigatorBase.h"

#include "Document.h"
#include "GPU.h"
#include "RuntimeEnabledFeatures.h"
#include "ServiceWorkerContainer.h"
#include "StorageManager.h"
#include "WebLockManager.h"
#include <mutex>
#include <wtf/Language.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/NumberOfCores.h>
#include <wtf/UniqueRef.h>
#include <wtf/text/WTFString.h>

#if OS(LINUX)
#include "sys/utsname.h"
#include <wtf/StdLibExtras.h>
#endif

#if PLATFORM(IOS_FAMILY)
#include "Device.h"
#endif

#ifndef WEBCORE_NAVIGATOR_PRODUCT
#define WEBCORE_NAVIGATOR_PRODUCT "Gecko"_s
#endif // ifndef WEBCORE_NAVIGATOR_PRODUCT

#ifndef WEBCORE_NAVIGATOR_PRODUCT_SUB
#define WEBCORE_NAVIGATOR_PRODUCT_SUB "20030107"_s
#endif // ifndef WEBCORE_NAVIGATOR_PRODUCT_SUB

#ifndef WEBCORE_NAVIGATOR_VENDOR
#define WEBCORE_NAVIGATOR_VENDOR "Apple Computer, Inc."_s
#endif // ifndef WEBCORE_NAVIGATOR_VENDOR

#ifndef WEBCORE_NAVIGATOR_VENDOR_SUB
#define WEBCORE_NAVIGATOR_VENDOR_SUB emptyString()
#endif // ifndef WEBCORE_NAVIGATOR_VENDOR_SUB

namespace WebCore {

NavigatorBase::NavigatorBase(ScriptExecutionContext* context)
    : ContextDestructionObserver(context)
{
}

NavigatorBase::~NavigatorBase() = default;

String NavigatorBase::appName()
{
    return "Netscape"_s;
}

String NavigatorBase::appVersion() const
{
    // Version is everything in the user agent string past the "Mozilla/" prefix.
    const String& agent = userAgent();
    return agent.substring(agent.find('/') + 1);
}

String NavigatorBase::platform() const
{
#if OS(LINUX)
    static LazyNeverDestroyed<String> platformName;
    static std::once_flag onceKey;
    std::call_once(onceKey, [] {
        struct utsname osname;
        platformName.construct(uname(&osname) >= 0 ? String(osname.sysname) + " "_str + String(osname.machine) : String(""_s));
    });
    return platformName->isolatedCopy();
#elif PLATFORM(IOS_FAMILY)
    return deviceName();
#elif OS(MAC_OS_X)
    return "MacIntel"_s;
#elif OS(WINDOWS)
    return "Win32"_s;
#else
    return ""_s;
#endif
}

String NavigatorBase::appCodeName()
{
    return "Mozilla"_s;
}

String NavigatorBase::product()
{
    return WEBCORE_NAVIGATOR_PRODUCT;
}

String NavigatorBase::productSub()
{
    return WEBCORE_NAVIGATOR_PRODUCT_SUB;
}

String NavigatorBase::vendor()
{
    return WEBCORE_NAVIGATOR_VENDOR;
}

String NavigatorBase::vendorSub()
{
    return WEBCORE_NAVIGATOR_VENDOR_SUB;
}

String NavigatorBase::language()
{
    return defaultLanguage();
}

Vector<String> NavigatorBase::languages()
{
    // We intentionally expose only the primary language for privacy reasons.
    return { defaultLanguage() };
}

StorageManager& NavigatorBase::storage()
{
    if (!m_storageManager)
        m_storageManager = StorageManager::create(*this);

    return *m_storageManager;
}

WebLockManager& NavigatorBase::locks()
{
    if (!m_webLockManager)
        m_webLockManager = WebLockManager::create(*this);

    return *m_webLockManager;
}

#if ENABLE(SERVICE_WORKER)
ServiceWorkerContainer& NavigatorBase::serviceWorker()
{
    ASSERT(RuntimeEnabledFeatures::sharedFeatures().serviceWorkerEnabled());
    if (!m_serviceWorkerContainer)
        m_serviceWorkerContainer = ServiceWorkerContainer::create(scriptExecutionContext(), *this).moveToUniquePtr();
    return *m_serviceWorkerContainer;
}

ExceptionOr<ServiceWorkerContainer&> NavigatorBase::serviceWorker(ScriptExecutionContext& context)
{
    if (is<Document>(context) && downcast<Document>(context).isSandboxed(SandboxOrigin))
        return Exception { SecurityError, "Service Worker is disabled because the context is sandboxed and lacks the 'allow-same-origin' flag" };
    return serviceWorker();
}
#endif

int NavigatorBase::hardwareConcurrency()
{
    static int numberOfCores;

    static std::once_flag once;
    std::call_once(once, [] {
        // Enforce a maximum for the number of cores reported to mitigate
        // fingerprinting for the minority of machines with large numbers of cores.
        // If machines with more than 8 cores become commonplace, we should bump this number.
        // see https://bugs.webkit.org/show_bug.cgi?id=132588 for the
        // rationale behind this decision.
        if (WTF::numberOfProcessorCores() < 8)
            numberOfCores = 4;
        else
            numberOfCores = 8;
    });

    return numberOfCores;
}

} // namespace WebCore