/*
 * Copyright (C) 2014, 2015 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. 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
 * 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

#if ENABLE(CONTENT_EXTENSIONS)

#include <WebCore/CompiledContentExtension.h>
#include <WebCore/ContentExtension.h>
#include <WebCore/ContentExtensionRule.h>
#include <wtf/CrossThreadCopier.h>
#include <wtf/HashMap.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/text/StringHash.h>
#include <wtf/text/WTFString.h>

namespace WebCore {

class DocumentLoader;
class Page;
class ResourceRequest;
struct ContentRuleListResults;

namespace ContentExtensions {

struct ResourceLoadInfo;

// The ContentExtensionsBackend is the internal model of all the content extensions.
//
// It provides two services:
// 1) It stores the rules for each content extension.
// 2) It provides APIs for the WebCore interfaces to use those rules efficiently.
class ContentExtensionsBackend {
    WTF_MAKE_TZONE_ALLOCATED_EXPORT(ContentExtensionsBackend, WEBCORE_EXPORT);
public:
    // - Rule management interface. This can be used by upper layer.

    // Set a list of rules for a given name. If there were existing rules for the name, they are overridden.
    // The identifier cannot be empty.
    WEBCORE_EXPORT void addContentExtension(const String& identifier, Ref<CompiledContentExtension>, URL&& extensionBaseURL, ContentExtension::ShouldCompileCSS = ContentExtension::ShouldCompileCSS::Yes);
    WEBCORE_EXPORT void removeContentExtension(const String& identifier);
    WEBCORE_EXPORT void removeAllContentExtensions();

    // - Internal WebCore Interface.
    struct ActionsFromContentRuleList {
        String contentRuleListIdentifier;
        bool sawIgnorePreviousRules { false };
        Vector<DeserializedAction> actions;
    };

    enum class ShouldSkipRuleList : bool { No, Yes };
    using RuleListFilter = Function<ShouldSkipRuleList(const String&)>;
    WEBCORE_EXPORT Vector<ActionsFromContentRuleList> actionsForResourceLoad(const ResourceLoadInfo&, const RuleListFilter& = { [](const String&) { return ShouldSkipRuleList::No; } }) const;
    WEBCORE_EXPORT StyleSheetContents* globalDisplayNoneStyleSheet(const String& identifier) const;

    ContentRuleListResults processContentRuleListsForLoad(Page&, const URL&, OptionSet<ResourceType>, DocumentLoader& initiatingDocumentLoader, const URL& redirectFrom, const RuleListFilter&);
    WEBCORE_EXPORT ContentRuleListResults processContentRuleListsForPingLoad(const URL&, const URL& mainDocumentURL, const URL& frameURL, const String& httpMethod);
    bool processContentRuleListsForResourceMonitoring(const URL&, const URL& mainDocumentURL, const URL& frameURL, OptionSet<ResourceType>);

    static const String& displayNoneCSSRule();

    void forEach(NOESCAPE const Function<void(const String&, ContentExtension&)>&);

    WEBCORE_EXPORT static bool shouldBeMadeSecure(const URL&);

    ContentExtensionsBackend() = default;
    ContentExtensionsBackend isolatedCopy() && { return ContentExtensionsBackend { crossThreadCopy(WTFMove(m_contentExtensions)) }; }

private:
    explicit ContentExtensionsBackend(HashMap<String, Ref<ContentExtension>>&& contentExtensions)
        : m_contentExtensions(WTFMove(contentExtensions))
    {
    }

    ActionsFromContentRuleList actionsFromContentRuleList(const ContentExtension&, const String& urlString, const ResourceLoadInfo&, ResourceFlags) const;

    HashMap<String, Ref<ContentExtension>> m_contentExtensions;
};

WEBCORE_EXPORT void applyResultsToRequest(ContentRuleListResults&&, Page*, ResourceRequest&, const URL& redirectURL = URL { });
WEBCORE_EXPORT void applyResultsToRequestIfCrossOriginRedirect(ContentRuleListResults&&, Page*, ResourceRequest&);
std::optional<String> customTrackerBlockingMessageForConsole(const ContentRuleListResults&, const URL& urlString = { }, const URL& mainDocumentURL = { });

} // namespace WebCore::ContentExtensions
} // namespace WebCore

#endif // ENABLE(CONTENT_EXTENSIONS)
