bitcooo/utils/BtcUtil.js

import systemConfiguration from 'utils/SystemConfiguration.js'
const bitcoin = require('bitcoinjs-lib')

let BtcUtil = {
	getBalance:async function(address,success) {
			let balance=0;
			try{
				let res= await uni.request({
					url: 'http://scan.weirui0755.com/btc/api/address/balancetrend/btc/' + address, //请求接口
					header: {
						'content-type': 'application/x-www-form-urlencoded', //自定义请求头信息
					}
				});
				if (res.data.code === 1) {
					if(res.data.data.length>0){
						var data=res.data.data[0];
						console.log(data,11111)
						for(let b in data){
							balance=data[b];
						}
					}
				}
			}catch(e){
				//TODO handle the exception
			}
			return balance;
	},
	btcToSatoshi:function(btcAmount){
		return Math.ceil(btcAmount * 1e8);
	},
	sendTransaction:async function(fromAddress, toAddress, value, privateKey){
		const utxo = await fetch(systemConfiguration.constant.btcUtxo+fromAddress);
		const utxoData=await utxo.json();
		const txs=utxoData.data.txs;
		let txsList=[];
		let remainingValue=value;
		let balanceSatoshis=0;
		
		for(let i=0;i<txs.length;i++){
			txsList.push(txs[i]);
			balanceSatoshis=Number(balanceSatoshis)+Number(txs[i].value);
			if(txs[i].value>remainingValue){
				break;
			}
			remainingValue=remainingValue-txs[i].value;
		}
		if(balanceSatoshis<=value){
			throw new Error("Insufficient balance");
		}
		console.log(balanceSatoshis,value)
		const feeSatoshis=this.btcToSatoshi(0.0001);
		
		balanceSatoshis=this.btcToSatoshi(balanceSatoshis);
		value=this.btcToSatoshi(value);
		let change = balanceSatoshis - feeSatoshis - value;
		
		let bob = new bitcoin.ECPair.fromWIF(privateKey,systemConfiguration.constant.btcNetwork);
		let txb = new bitcoin.TransactionBuilder(systemConfiguration.constant.btcNetwork);
		for(let i=0;i<txsList.length;i++){
			
			txb.addInput(txsList[i].txid, txsList[i].output_no);
			
		}
		console.log(change)
		txb.addOutput(fromAddress, change);
		console.log(txsList[0].txid,txsList[0].output_no)
		txb.addOutput(toAddress, value);
		
		for(let i=0;i<txsList.length;i++){
			txb.sign(i, bob);
		}
		// 签名交易，0代表索引，输入排序，这里只有一个输入，所以是第0位。
		
		
		// 序列化成一串字符
		const txid = txb.build().toHex();
		const network="BTCTEST"
		const result = await fetch(systemConfiguration.constant.btcSendTransaction,{
		  method:'post',
		  headers:{'Content-Type':'application/json'},
		  body:JSON.stringify({txid,network})
		});
		
		return txid;
	}	
}
export default BtcUtil