bch-slpjs/lib/utils.ts

Simple Ledger Protocol (SLP) JavaScript Library

import * as bchaddr from 'bchaddrjs-slp';
import BigNumber from 'bignumber.js';
import { SlpAddressUtxoResult, utxo } from './slpjs';
import { AddressUtxoResult } from 'bitbox-sdk/lib/Address';

export class Utils {

    static toCashAddress(address: string) {
        return <string>bchaddr.toCashAddress(address);
    }

    static toSlpAddress(address: string) {
        return <string>bchaddr.toSlpAddress(address);
    }

    static isSlpAddress(address: string) {
        return <string>bchaddr.isSlpAddress(address);
    }

    static isMainnet(address: string) {
        if(bchaddr.decodeAddress(address).network === 'mainnet')
            return true
        return false
    }

    static txnBuilderString(address: string) {
        return Utils.isMainnet(address) ? 'bitcoincash' : 'bchtest';
    }

    static mapToSlpAddressUtxoResultArray(bitboxResult: AddressUtxoResult) {
        return bitboxResult.utxos.map(txo => {
            return <SlpAddressUtxoResult> {
                satoshis: txo.satoshis,
                txid: txo.txid,
                amount: txo.amount,
                confirmations: txo.confirmations,
                height: txo.height,
                vout: txo.vout,
                cashAddress: bitboxResult.cashAddress,
                legacyAddress: bitboxResult.legacyAddress,
                scriptPubKey: bitboxResult.scriptPubKey
            }
        })
    }

    static mapToUtxoArray(utxos: SlpAddressUtxoResult[]) {
        return utxos.map(txo => 
        {
            return <utxo> { 
                satoshis: new BigNumber(txo.satoshis),
                wif: txo.wif,
                txid: txo.txid,
                vout: txo.vout,
                slpTransactionDetails: txo.slpTransactionDetails,
                slpUtxoJudgement: txo.slpUtxoJudgement,
                slpUtxoJudgementAmount: txo.slpUtxoJudgementAmount
            }
        })
    }

    static getPushDataOpcode(data: number[]|Buffer) {
        let length = data.length

        if (length === 0)
            return [0x4c, 0x00]
        else if (length < 76)
            return length
        else if (length < 256)
            return [0x4c, length]
        
        throw Error("Pushdata too large")
    }

    static int2FixedBuffer(amount: BigNumber) {
        try {
            amount.absoluteValue()
        } catch(_) {
            throw Error("Amount must be an instance of BigNumber");
        }

        let hex: string = amount.toString(16);
        hex = hex.padStart(16, '0');
        return Buffer.from(hex, 'hex');
    }

    // This is for encoding Script in scriptPubKey OP_RETURN scripts, where BIP62.3 does not apply
    static encodeScript(script: (number|number[])[]) {
        const bufferSize = <number>script.reduce((acc: number, cur) => {
            if (Array.isArray(cur)) return acc + cur.length
            else return acc + 1
        }, 0)

        const buffer = Buffer.allocUnsafe(bufferSize)
        let offset = 0
        script.forEach((scriptItem) => {
            if (Array.isArray(scriptItem)) {
                scriptItem.forEach((item) => {
                    buffer.writeUInt8(item, offset)
                    offset += 1
                })
            } else {
                buffer.writeUInt8(scriptItem, offset)
                offset += 1
            }
        })

        return buffer
    }

    // txidFromHex(hex) {
    //     let buffer = Buffer.from(hex, "hex")
    //     let hash = this.BITBOX.Crypto.hash256(buffer).toString('hex')
    //     return hash.match(/[a-fA-F0-9]{2}/g).reverse().join('')
    // }

    // Method to get Script 32-bit integer (little-endian signed magnitude representation)
	// readScriptInt32(buffer) {
	// 	let number;
	// 	if(buffer.readUInt32LE(0) > 2147483647)
	// 		number = -1 * (buffer.readUInt32LE(0) - 2147483648);
	// 	else
	// 		number = buffer.readUInt32LE(0);
	// 	return number;
    // }
}