org.sol4k.instruction.SplTransferInstruction.kt Maven / Gradle / Ivy

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Kotlin, JVM, and Android client for Solana

There is a newer version: 0.5.4

package org.sol4k.instruction

import org.sol4k.AccountMeta
import org.sol4k.Binary
import org.sol4k.Constants.TOKEN_PROGRAM_ID
import org.sol4k.PublicKey
import java.io.ByteArrayOutputStream

class SplTransferInstruction @JvmOverloads constructor(
    val from: PublicKey,
    val to: PublicKey,
    val mint: PublicKey,
    val owner: PublicKey,
    val amount: Long,
    val decimals: Int,
    val signers: List = emptyList(),
) : Instruction {
    companion object {
        @Suppress("unused")
        private const val INSTRUCTION_TRANSFER = 3
        private const val INSTRUCTION_TRANSFER_CHECKED = 12
    }

    override val data: ByteArray
        get() {
            ByteArrayOutputStream().use { buffer ->
                buffer.write(INSTRUCTION_TRANSFER_CHECKED)
                buffer.write(Binary.int64(amount))
                buffer.write(decimals)
                return buffer.toByteArray()
            }
        }

    override val keys: List = listOf(
        AccountMeta.writable(from),
        AccountMeta(mint),
        AccountMeta.writable(to),
        if (signers.isEmpty()) AccountMeta.signer(owner) else AccountMeta(owner),
        *signers.map { s -> AccountMeta.signer(s) }.toTypedArray(),
    )

    override val programId: PublicKey = TOKEN_PROGRAM_ID
}