/*
 * Copyright (C) 2010 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 "CertificateInfoBase.h"
#include <wtf/RetainPtr.h>
#include <wtf/Vector.h>
#include <wtf/cf/TypeCastsCF.h>
#include <wtf/persistence/PersistentCoders.h>
#include <wtf/persistence/PersistentDecoder.h>
#include <wtf/persistence/PersistentEncoder.h>

#if PLATFORM(COCOA)
#include <Security/SecCertificate.h>
#include <Security/SecTrust.h>
#include <wtf/spi/cocoa/SecuritySPI.h>

WTF_DECLARE_CF_TYPE_TRAIT(SecCertificate);
#endif

namespace WebCore {

class CertificateInfo : public CertificateInfoBase {
public:
     CertificateInfo() = default;
 
    enum class Type {
        None,
        CertificateChain,
#if HAVE(SEC_TRUST_SERIALIZATION)
        Trust,
#endif
    };

#if HAVE(SEC_TRUST_SERIALIZATION)
    explicit CertificateInfo(RetainPtr<SecTrustRef>&& trust)
        : m_trust(WTFMove(trust))
    {
    }
 
    SecTrustRef trust() const { return m_trust.get(); }
#endif

    CertificateInfo(RetainPtr<CFArrayRef>&& certificateChain)
        : m_certificateChain(WTFMove(certificateChain))
    {
    }

    WEBCORE_EXPORT CFArrayRef certificateChain() const;

    WEBCORE_EXPORT Type type() const;
    WEBCORE_EXPORT bool containsNonRootSHA1SignedCertificate() const;

    Optional<SummaryInfo> summaryInfo() const;

    bool isEmpty() const { return type() == Type::None; }

#if PLATFORM(COCOA)
    static RetainPtr<CFArrayRef> certificateChainFromSecTrust(SecTrustRef);
#endif

#ifndef NDEBUG
#if PLATFORM(COCOA)
    void dump() const;
#endif
#endif

private:
#if HAVE(SEC_TRUST_SERIALIZATION)
    RetainPtr<SecTrustRef> m_trust;
#endif
    mutable RetainPtr<CFArrayRef> m_certificateChain;
};

} // namespace WebCore

namespace WTF {
namespace Persistence {

static void encodeCFData(Encoder& encoder, CFDataRef data)
{
    uint64_t length = CFDataGetLength(data);
    const uint8_t* bytePtr = CFDataGetBytePtr(data);

    encoder << length;
    encoder.encodeFixedLengthData(bytePtr, static_cast<size_t>(length));
}

static bool decodeCFData(Decoder& decoder, RetainPtr<CFDataRef>& data)
{
    uint64_t size = 0;
    if (!decoder.decode(size))
        return false;

    Vector<uint8_t> vector(static_cast<size_t>(size));
    if (!decoder.decodeFixedLengthData(vector.data(), vector.size()))
        return false;

    data = adoptCF(CFDataCreate(nullptr, vector.data(), vector.size()));
    return true;
}

#if HAVE(SEC_TRUST_SERIALIZATION)
static void encodeSecTrustRef(Encoder& encoder, SecTrustRef trust)
{
    auto data = adoptCF(SecTrustSerialize(trust, nullptr));
    if (!data) {
        encoder << false;
        return;
    }

    encoder << true;
    encodeCFData(encoder, data.get());
}

static bool decodeSecTrustRef(Decoder& decoder, RetainPtr<SecTrustRef>& result)
{
    bool hasTrust;
    if (!decoder.decode(hasTrust))
        return false;

    if (!hasTrust)
        return true;

    RetainPtr<CFDataRef> trustData;
    if (!decodeCFData(decoder, trustData))
        return false;

    auto trust = adoptCF(SecTrustDeserialize(trustData.get(), nullptr));
    if (!trust)
        return false;

    result = WTFMove(trust);
    return true;
}
#endif

#if PLATFORM(COCOA)
static void encodeCertificateChain(Encoder& encoder, CFArrayRef certificateChain)
{
    CFIndex size = CFArrayGetCount(certificateChain);
    Vector<CFTypeRef, 32> values(size);

    CFArrayGetValues(certificateChain, CFRangeMake(0, size), values.data());

    encoder << static_cast<uint64_t>(size);

    for (CFIndex i = 0; i < size; ++i) {
        ASSERT(values[i]);
        auto data = adoptCF(SecCertificateCopyData(checked_cf_cast<SecCertificateRef>(values[i])));
        encodeCFData(encoder, data.get());
    }
}

static bool decodeCertificateChain(Decoder& decoder, RetainPtr<CFArrayRef>& certificateChain)
{
    uint64_t size;
    if (!decoder.decode(size))
        return false;

    auto array = adoptCF(CFArrayCreateMutable(0, 0, &kCFTypeArrayCallBacks));

    for (size_t i = 0; i < size; ++i) {
        RetainPtr<CFDataRef> data;
        if (!decodeCFData(decoder, data))
            return false;

        auto certificate = adoptCF(SecCertificateCreateWithData(0, data.get()));
        CFArrayAppendValue(array.get(), certificate.get());
    }

    certificateChain = WTFMove(array);
    return true;
}
#endif

template<> struct Coder<WebCore::CertificateInfo> {
    static void encode(Encoder& encoder, const WebCore::CertificateInfo& certificateInfo)
    {
        encoder.encodeEnum(certificateInfo.type());

        switch (certificateInfo.type()) {
#if HAVE(SEC_TRUST_SERIALIZATION)
        case WebCore::CertificateInfo::Type::Trust:
            encodeSecTrustRef(encoder, certificateInfo.trust());
            break;
#endif
#if PLATFORM(COCOA)
        case WebCore::CertificateInfo::Type::CertificateChain: {
            encodeCertificateChain(encoder, certificateInfo.certificateChain());
            break;
        }
#endif
        case WebCore::CertificateInfo::Type::None:
            // Do nothing.
            break;
        }
    }

    static bool decode(Decoder& decoder, WebCore::CertificateInfo& certificateInfo)
    {
        WebCore::CertificateInfo::Type certificateInfoType;
        if (!decoder.decodeEnum(certificateInfoType))
            return false;

        switch (certificateInfoType) {
#if HAVE(SEC_TRUST_SERIALIZATION)
        case WebCore::CertificateInfo::Type::Trust: {
            RetainPtr<SecTrustRef> trust;
            if (!decodeSecTrustRef(decoder, trust))
                return false;

            certificateInfo = WebCore::CertificateInfo(WTFMove(trust));
            return true;
        }
#endif
#if PLATFORM(COCOA)
        case WebCore::CertificateInfo::Type::CertificateChain: {
            RetainPtr<CFArrayRef> certificateChain;
            if (!decodeCertificateChain(decoder, certificateChain))
                return false;

            certificateInfo = WebCore::CertificateInfo(WTFMove(certificateChain));
            return true;
        }
#endif
        case WebCore::CertificateInfo::Type::None:
            // Do nothing.
            break;
        }

        return true;
    }
};

} // namespace WTF::Persistence
} // namespace WTF