org.ergoplatform.appkit.BoxAttachmentGeneric Maven / Gradle / Ivy

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package org.ergoplatform.appkit;

import java.util.Arrays;

import org.ergoplatform.sdk.JavaHelpers;
import scala.Tuple2;
import sigma.Coll;

/**
 * Represents an attachment according to EIP-29.
 * This is the superclass of all actual attachment types, as well as representing unknown types.
 */
public class BoxAttachmentGeneric implements BoxAttachment {
    private final int attachmentType;
    private final byte[] attachmentContent;

    BoxAttachmentGeneric(int attachmentType, byte[] attachmentContent) {
        this.attachmentType = attachmentType;
        this.attachmentContent = attachmentContent;
    }

    @Override
    public Type getType() {
        return BoxAttachmentGeneric.Type.fromTypeRawValue(attachmentType);
    }

    @Override
    public int getTypeRawValue() {
        return attachmentType;
    }

    @Override
    public ErgoValue, Tuple2>>> getErgoValue() {
        ErgoValue>> contentPair = ErgoValue.pairOf(
            ErgoValue.of(getTypeRawValue()),
            ErgoValue.of(attachmentContent));
        return ErgoValue.pairOf(ErgoValue.of(BoxAttachment.MAGIC_BYTES), contentPair);
    }

    @Override
    public ErgoValue[] getOutboxRegistersForAttachment() {
        ErgoValue[] registers = new ErgoValue[6];

        for (int i = 0; i < registers.length - 1; i++) {
            registers[i] = ErgoValue.unit();
        }
        registers[5] = getErgoValue();
        return registers;
    }

    /**
     * @param r9 Ergo value to create the attachment object from, usually stored in register 9 of boxes
     * @return object representing the attachment
     */
    public static BoxAttachment createFromErgoValue(ErgoValue r9) {
        String illegalArgumentException = "R9 must be of pair (Coll[0x50, 0x52, 0x50], Tuple2(Int, Coll[Byte]), actual: ";

        if (!(r9.getValue() instanceof Tuple2)) {
            throw new IllegalArgumentException(illegalArgumentException + r9.getValue().getClass().getSimpleName());
        }

        Tuple2 attachmentWrapper = (Tuple2) r9.getValue();
        if (!(attachmentWrapper._1 instanceof Coll) || !(attachmentWrapper._2 instanceof Tuple2)) {
            throw new IllegalArgumentException(illegalArgumentException + r9.getType().toString());
        }

        byte[] magicBytes = JavaHelpers.collToByteArray((Coll