Source/WebCore/dom/LoadableClassicScript.cpp

/*
 * Copyright (C) 2016 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
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#include "config.h"
#include "LoadableClassicScript.h"

#include "ScriptElement.h"
#include "ScriptSourceCode.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/text/StringImpl.h>

namespace WebCore {

Ref<LoadableClassicScript> LoadableClassicScript::create(CachedResourceHandle<CachedScript>&& cachedScript)
{
    ASSERT(cachedScript);
    auto script = adoptRef(*new LoadableClassicScript(WTFMove(cachedScript)));
    cachedScript->addClient(script.get());
    return script;
}

LoadableClassicScript::~LoadableClassicScript()
{
    m_cachedScript->removeClient(*this);
}

bool LoadableClassicScript::isLoaded() const
{
    return m_cachedScript->isLoaded();
}

std::optional<LoadableScript::Error> LoadableClassicScript::error() const
{
    if (m_error)
        return m_error;

    if (m_cachedScript->errorOccurred())
        return Error { ErrorType::CachedScript, std::nullopt };

    return std::nullopt;
}

bool LoadableClassicScript::wasCanceled() const
{
    return m_cachedScript->wasCanceled();
}

void LoadableClassicScript::notifyFinished(CachedResource& resource)
{
    if (resource.resourceError().isAccessControl()) {
        static NeverDestroyed<String> consoleMessage(ASCIILiteral("Cross-origin script load denied by Cross-Origin Resource Sharing policy."));
        m_error = Error {
            ErrorType::CrossOriginLoad,
            ConsoleMessage {
                MessageSource::JS,
                MessageLevel::Error,
                consoleMessage
            }
        };
    }

#if ENABLE(NOSNIFF)
    if (!m_error && !m_cachedScript->mimeTypeAllowedByNosniff()) {
        m_error = Error {
            ErrorType::Nosniff,
            ConsoleMessage {
                MessageSource::Security,
                MessageLevel::Error,
                makeString(
                    "Refused to execute script from '", m_cachedScript->url().stringCenterEllipsizedToLength(),
                    "' because its MIME type ('", m_cachedScript->mimeType(), "') is not executable, and strict MIME type checking is enabled.")
            }
        };
    }
#endif

    notifyClientFinished();
}

void LoadableClassicScript::execute(ScriptElement& scriptElement)
{
    ASSERT(!error());
    scriptElement.executeClassicScript(ScriptSourceCode(m_cachedScript.get(), JSC::SourceProviderSourceType::Program));
}

}