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Certificate transparency for Android and Java

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/*
 * Copyright 2023 Appmattus Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.appmattus.certificatetransparency.internal.utils.asn1.x509

import com.appmattus.certificatetransparency.internal.utils.asn1.ASN1Logger
import com.appmattus.certificatetransparency.internal.utils.asn1.ASN1Object
import com.appmattus.certificatetransparency.internal.utils.asn1.ASN1Sequence
import com.appmattus.certificatetransparency.internal.utils.asn1.EmptyLogger
import com.appmattus.certificatetransparency.internal.utils.asn1.bytes.ByteBuffer
import com.appmattus.certificatetransparency.internal.utils.asn1.bytes.joinToByteBuffer
import com.appmattus.certificatetransparency.internal.utils.asn1.header.ASN1HeaderTag
import com.appmattus.certificatetransparency.internal.utils.asn1.header.TagClass
import com.appmattus.certificatetransparency.internal.utils.asn1.header.TagForm
import com.appmattus.certificatetransparency.internal.utils.asn1.toAsn1

internal class Extensions private constructor(
    override val tag: ASN1HeaderTag,
    override val encoded: ByteBuffer,
    override val logger: ASN1Logger
) : ASN1Object() {

    val values: List by lazy {
        (encoded.toAsn1(logger) as ASN1Sequence).values.map {
            Extension.create(
                it as ASN1Sequence
            )
        }
    }

    override fun toString(): String {
        val values = values
        return values.joinToString(separator = "\n\n") { it.toString() }
    }

    companion object {
        fun create(tag: ASN1HeaderTag, encoded: ByteBuffer, logger: ASN1Logger) = Extensions(tag, encoded, logger)

        @Suppress("MagicNumber")
        fun create(extensions: List, logger: ASN1Logger = EmptyLogger): Extensions {
            val encoded = extensions.map { it.bytes }.joinToByteBuffer()
            return Extensions(
                tag = ASN1HeaderTag(TagClass.ContextSpecific, TagForm.Constructed, 0x03, 1),
                encoded = ASN1Sequence(ASN1HeaderTag(TagClass.Universal, TagForm.Constructed, 0x10, 1), encoded, logger).bytes,
                logger = logger
            )
        }
    }
}