/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 * Copyright (C) 2009, 2011 Google 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. 
 */

#pragma once

#include <WebCore/AdvancedPrivacyProtections.h>
#include <WebCore/CertificateInfo.h>
#include <WebCore/ContentSecurityPolicyResponseHeaders.h>
#include <WebCore/CrossOriginEmbedderPolicy.h>
#include <WebCore/FetchOptions.h>
#include <WebCore/ResourceError.h>
#include <WebCore/ResourceRequest.h>
#include <WebCore/ResourceResponse.h>
#include <WebCore/ScriptBuffer.h>
#include <WebCore/ScriptExecutionContextIdentifier.h>
#include <WebCore/ServiceWorkerRegistrationData.h>
#include <WebCore/ThreadableLoader.h>
#include <WebCore/ThreadableLoaderClient.h>
#include <memory>
#include <wtf/OptionSet.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/URL.h>
#include <wtf/text/StringBuilder.h>

namespace WebCore {

class Exception;
class ScriptExecutionContext;
class TextResourceDecoder;
class WorkerScriptLoaderClient;
struct ServiceWorkerRegistrationData;
struct WorkerFetchResult;
enum class CertificateInfoPolicy : uint8_t;

class WorkerScriptLoader final : public RefCounted<WorkerScriptLoader>, public ThreadableLoaderClient {
    WTF_MAKE_TZONE_ALLOCATED(WorkerScriptLoader);
    WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(WorkerScriptLoader);
public:
    enum class AlwaysUseUTF8 : bool { No, Yes };
    static Ref<WorkerScriptLoader> create(AlwaysUseUTF8 alwaysUseUTF8 = AlwaysUseUTF8::No)
    {
        return adoptRef(*new WorkerScriptLoader(alwaysUseUTF8));
    }

    enum class Source : uint8_t { ClassicWorkerScript, ClassicWorkerImport, ModuleScript };

    std::optional<Exception> loadSynchronously(ScriptExecutionContext*, const URL&, Source, FetchOptions::Mode, FetchOptions::Cache, ContentSecurityPolicyEnforcement, const String& initiatorIdentifier);
    void loadAsynchronously(ScriptExecutionContext&, ResourceRequest&&, Source, FetchOptions&&, ContentSecurityPolicyEnforcement, ServiceWorkersMode, WorkerScriptLoaderClient&, String&& taskMode, std::optional<ScriptExecutionContextIdentifier> clientIdentifier = std::nullopt);

    void notifyError(std::optional<ScriptExecutionContextIdentifier>);

    OptionSet<AdvancedPrivacyProtections> advancedPrivacyProtections() const { return m_advancedPrivacyProtections; }

    const ScriptBuffer& script() const { return m_script; }
    const ContentSecurityPolicyResponseHeaders& contentSecurityPolicy() const { return m_contentSecurityPolicy; }
    const String& referrerPolicy() const { return m_referrerPolicy; }
    const CrossOriginEmbedderPolicy& crossOriginEmbedderPolicy() const { return m_crossOriginEmbedderPolicy; }
    const URL& url() const { return m_url; }
    const URL& responseURL() const;
    ResourceResponse::Source responseSource() const { return m_responseSource; }
    bool isRedirected() const { return m_isRedirected; }
    const CertificateInfo& certificateInfo() const { return m_certificateInfo; }
    const String& responseMIMEType() const { return m_responseMIMEType; }
    ResourceResponse::Tainting responseTainting() const { return m_responseTainting; }
    bool failed() const { return m_failed; }
    ResourceLoaderIdentifier identifier() const { return *m_identifier; }
    const ResourceError& error() const { return m_error; }

    WorkerFetchResult fetchResult() const;

    void didReceiveResponse(ScriptExecutionContextIdentifier, std::optional<ResourceLoaderIdentifier>, const ResourceResponse&) override;
    void didReceiveData(const SharedBuffer&) override;
    void didFinishLoading(ScriptExecutionContextIdentifier, std::optional<ResourceLoaderIdentifier>, const NetworkLoadMetrics&) override;
    void didFail(std::optional<ScriptExecutionContextIdentifier>, const ResourceError&) override;

    void cancel();

    WEBCORE_EXPORT static ResourceError validateWorkerResponse(const ResourceResponse&, Source, FetchOptions::Destination);

    class ServiceWorkerDataManager : public ThreadSafeRefCounted<ServiceWorkerDataManager, WTF::DestructionThread::Main> {
    public:
        static Ref<ServiceWorkerDataManager> create(ScriptExecutionContextIdentifier identifier) { return adoptRef(*new ServiceWorkerDataManager(identifier)); }
        WEBCORE_EXPORT ~ServiceWorkerDataManager();

        WEBCORE_EXPORT void setData(ServiceWorkerData&&);
        std::optional<ServiceWorkerData> takeData();

    private:
        explicit ServiceWorkerDataManager(ScriptExecutionContextIdentifier identifier)
            : m_clientIdentifier(identifier)
        {
        }

        ScriptExecutionContextIdentifier m_clientIdentifier;
        Lock m_activeServiceWorkerDataLock;
        std::optional<ServiceWorkerData> m_activeServiceWorkerData WTF_GUARDED_BY_LOCK(m_activeServiceWorkerDataLock);
    };

    void setControllingServiceWorker(ServiceWorkerData&&);
    std::optional<ServiceWorkerData> takeServiceWorkerData();
    WEBCORE_EXPORT static RefPtr<ServiceWorkerDataManager> serviceWorkerDataManagerFromIdentifier(ScriptExecutionContextIdentifier);

    std::optional<ScriptExecutionContextIdentifier> clientIdentifier() const { return m_clientIdentifier; }
    const String& userAgentForSharedWorker() const { return m_userAgentForSharedWorker; }

private:
    friend class RefCounted<WorkerScriptLoader>;
    friend struct std::default_delete<WorkerScriptLoader>;

    WorkerScriptLoader(AlwaysUseUTF8);
    ~WorkerScriptLoader();

    std::unique_ptr<ResourceRequest> createResourceRequest(const String& initiatorIdentifier);
    void notifyFinished(std::optional<ScriptExecutionContextIdentifier>);

    WeakPtr<WorkerScriptLoaderClient> m_client;
    RefPtr<ThreadableLoader> m_threadableLoader;
    const RefPtr<TextResourceDecoder> m_decoder;
    ScriptBuffer m_script;
    URL m_url;
    URL m_responseURL;
    CertificateInfo m_certificateInfo;
    String m_responseMIMEType;
    Source m_source;
    FetchOptions::Destination m_destination;
    ContentSecurityPolicyResponseHeaders m_contentSecurityPolicy;
    String m_referrerPolicy;
    CrossOriginEmbedderPolicy m_crossOriginEmbedderPolicy;
    Markable<ResourceLoaderIdentifier> m_identifier;
    bool m_alwaysUseUTF8 { false };
    bool m_failed { false };
    bool m_finishing { false };
    bool m_isRedirected { false };
    bool m_isCOEPEnabled { false };
    ResourceResponse::Source m_responseSource { ResourceResponse::Source::Unknown };
    ResourceResponse::Tainting m_responseTainting { ResourceResponse::Tainting::Basic };
    ResourceError m_error;
    Markable<ScriptExecutionContextIdentifier> m_clientIdentifier;
    bool m_didAddToWorkerScriptLoaderMap { false };
    bool m_isMatchingServiceWorkerRegistration { false };
    std::optional<SecurityOriginData> m_topOriginForServiceWorkerRegistration;
    RefPtr<ServiceWorkerDataManager> m_serviceWorkerDataManager;
    WeakPtr<ScriptExecutionContext> m_context;
    String m_userAgentForSharedWorker;
    OptionSet<AdvancedPrivacyProtections> m_advancedPrivacyProtections;
};

} // namespace WebCore
