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Adding bitcoinJS-lib and parse P2SH and P2WSH scripts.

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softsimon 2021-01-06 01:36:28 +07:00
parent 632c243b34
commit 9e1ef1b747
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GPG Key ID: 488D7DCFB5A430D7
2 changed files with 41 additions and 15 deletions
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1
backend/package.json
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@ -31,6 +31,7 @@
"@mempool/bitcoin": "^3.0.2",
"@mempool/electrum-client": "^1.1.7",
"axios": "^0.21.0",
"bitcoinjs-lib": "^5.2.0",
"crypto-js": "^4.0.0",
"express": "^4.17.1",
"locutus": "^2.0.12",

55
backend/src/api/bitcoin/bitcoin-api.ts
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@ -1,5 +1,6 @@
import config from '../../config';
import * as bitcoin from '@mempool/bitcoin';
import * as bitcoinjs from 'bitcoinjs-lib';
import { AbstractBitcoinApi } from './bitcoin-api-abstract-factory';
import { IBitcoinApi } from './bitcoin-api.interface';
import { IEsploraApi } from './esplora-api.interface';
@ -203,6 +204,7 @@ class BitcoinApi implements AbstractBitcoinApi {
}
const innerTx = await this.$getRawTransaction(vin.txid, false);
vin.prevout = innerTx.vout[vin.vout];
this.addInnerScriptsToVin(vin);
}
return transaction;
}
@ -216,20 +218,6 @@ class BitcoinApi implements AbstractBitcoinApi {
});
}
private convertScriptSigAsm(str: string): string {
const a = str.split(' ');
const b: string[] = [];
a.forEach((chunk) => {
if (chunk.substr(0, 3) === 'OP_') {
b.push(chunk);
} else {
chunk = chunk.replace('[ALL]', '01');
b.push('OP_PUSHBYTES_' + Math.round(chunk.length / 2) + ' ' + chunk);
}
});
return b.join(' ');
}
private async $calculateFeeFromInputs(transaction: IEsploraApi.Transaction, addPrevout: boolean): Promise<IEsploraApi.Transaction> {
if (transaction.vin[0].is_coinbase) {
transaction.fee = 0;
@ -240,14 +228,51 @@ class BitcoinApi implements AbstractBitcoinApi {
const innerTx = await this.$getRawTransaction(vin.txid, !addPrevout);
if (addPrevout) {
vin.prevout = innerTx.vout[vin.vout];
this.addInnerScriptsToVin(vin);
}
totalIn += innerTx.vout[vin.vout].value;
}
const totalOut = transaction.vout.reduce((prev, output) => prev + output.value, 0);
const totalOut = transaction.vout.reduce((p, output) => p + output.value, 0);
transaction.fee = parseFloat((totalIn - totalOut).toFixed(8));
return transaction;
}
private convertScriptSigAsm(str: string): string {
const a = str.split(' ');
const b: string[] = [];
a.forEach((chunk) => {
if (chunk.substr(0, 3) === 'OP_') {
chunk = chunk.replace(/^OP_(\d+)/, 'OP_PUSHNUM_$1');
chunk = chunk.replace('OP_CHECKSEQUENCEVERIFY', 'OP_CSV');
b.push(chunk);
} else {
chunk = chunk.replace('[ALL]', '01');
if (chunk === '0') {
b.push('OP_0');
} else {
b.push('OP_PUSHBYTES_' + Math.round(chunk.length / 2) + ' ' + chunk);
}
}
});
return b.join(' ');
}
private addInnerScriptsToVin(vin: IEsploraApi.Vin): void {
if (!vin.prevout) {
return;
}
if (vin.prevout.scriptpubkey_type === 'p2sh') {
const redeemScript = vin.scriptsig_asm.split(' ').reverse()[0];
vin.inner_redeemscript_asm = this.convertScriptSigAsm(bitcoinjs.script.toASM(Buffer.from(redeemScript, 'hex')));
}
if (vin.prevout.scriptpubkey_type === 'v0_p2wsh' && vin.witness) {
const witnessScript = vin.witness[vin.witness.length - 1];
vin.inner_witnessscript_asm = this.convertScriptSigAsm(bitcoinjs.script.toASM(Buffer.from(witnessScript, 'hex')));
}
}
}
export default BitcoinApi;