/*
 * Copyright (C) 2021 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

#include <wtf/text/WTFString.h>

namespace WebCore {

class ResourceResponse;
class ScriptExecutionContext;

// https://html.spec.whatwg.org/multipage/origin.html#embedder-policy-value
enum class CrossOriginEmbedderPolicyValue : bool {
    UnsafeNone,
    RequireCORP
};

// https://html.spec.whatwg.org/multipage/origin.html#embedder-policy
struct CrossOriginEmbedderPolicy {
    CrossOriginEmbedderPolicyValue value { CrossOriginEmbedderPolicyValue::UnsafeNone };
    String reportingEndpoint;
    CrossOriginEmbedderPolicyValue reportOnlyValue { CrossOriginEmbedderPolicyValue::UnsafeNone };
    String reportOnlyReportingEndpoint;

    CrossOriginEmbedderPolicy isolatedCopy() const;
    template<class Encoder> void encode(Encoder&) const;
    template<class Decoder> static std::optional<CrossOriginEmbedderPolicy> decode(Decoder&);
};

inline bool operator==(const CrossOriginEmbedderPolicy& a, const CrossOriginEmbedderPolicy& b)
{
    return a.value == b.value && a.reportingEndpoint == b.reportingEndpoint && a.reportOnlyValue == b.reportOnlyValue && a.reportOnlyReportingEndpoint == b.reportOnlyReportingEndpoint;
}

template<class Encoder>
void CrossOriginEmbedderPolicy::encode(Encoder& encoder) const
{
    encoder << value << reportingEndpoint << reportOnlyValue << reportOnlyReportingEndpoint;
}

template<class Decoder>
std::optional<CrossOriginEmbedderPolicy> CrossOriginEmbedderPolicy::decode(Decoder& decoder)
{
    std::optional<CrossOriginEmbedderPolicyValue> value;
    decoder >> value;
    if (!value)
        return std::nullopt;

    std::optional<String> reportingEndpoint;
    decoder >> reportingEndpoint;
    if (!reportingEndpoint)
        return std::nullopt;

    std::optional<CrossOriginEmbedderPolicyValue> reportOnlyValue;
    decoder >> reportOnlyValue;
    if (!reportOnlyValue)
        return std::nullopt;

    std::optional<String> reportOnlyReportingEndpoint;
    decoder >> reportOnlyReportingEndpoint;
    if (!reportOnlyReportingEndpoint)
        return std::nullopt;

    return {{
        *value,
        WTFMove(*reportingEndpoint),
        *reportOnlyValue,
        WTFMove(*reportOnlyReportingEndpoint)
    }};
}

CrossOriginEmbedderPolicy obtainCrossOriginEmbedderPolicy(const ResourceResponse&, const ScriptExecutionContext&);
WEBCORE_EXPORT void addCrossOriginEmbedderPolicyHeaders(ResourceResponse&, const CrossOriginEmbedderPolicy&);

enum class IsSecureContext : bool { No, Yes };
WEBCORE_EXPORT CrossOriginEmbedderPolicy obtainCrossOriginEmbedderPolicy(const ResourceResponse&, IsSecureContext);

} // namespace WebCore
