charms-wallet-js
Version:
Professional Bitcoin wallet library for Charms ecosystem using @scure stack
261 lines • 9.52 kB
JavaScript
;
// AddressWallet implementation for Charms Wallet JS
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var __importStar = (this && this.__importStar) || function (mod) {
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var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.AddressWallet = void 0;
const btc = __importStar(require("@scure/btc-signer"));
const base_1 = require("@scure/base");
const types_1 = require("../types");
/**
* AddressWallet class for working with individual Bitcoin addresses
* Allows signing transactions without exposing the full mnemonic
*
* Note: For advanced transaction building, use @scure/btc-signer directly
*/
class AddressWallet {
constructor(privateKey, network, address) {
this.privateKey = privateKey;
this.network = network;
// Derive public key from private key
this.publicKey = this.derivePublicKey(privateKey);
this.xOnlyPubkey = this.publicKey.slice(1); // Remove prefix byte for Taproot
// Use provided address or generate from public key
this.address = address || this.generateAddressFromPublicKey();
}
/**
* Gets the Bitcoin address for this wallet
*/
getAddress() {
return this.address;
}
/**
* Gets the public key (33 bytes with prefix)
*/
getPublicKey() {
return this.publicKey;
}
/**
* Gets the x-only public key (32 bytes, for Taproot)
*/
getXOnlyPublicKey() {
return this.xOnlyPubkey;
}
/**
* Signs a PSBT using this address's private key
*
* Note: For complex transaction building, use TransactionBuilder + @scure/btc-signer
*/
async signPSBT(psbtHex, utxo) {
try {
// Validate inputs
this.validateSigningInputs(psbtHex, utxo);
// Parse PSBT
const psbtBytes = base_1.hex.decode(psbtHex);
const tx = btc.Transaction.fromPSBT(psbtBytes);
// Update input with witness UTXO if needed
this.updateWitnessUtxo(tx, utxo);
// Sign the transaction
tx.sign(this.privateKey);
// Finalize the transaction
tx.finalize();
// Extract the final transaction
const finalTx = tx.extract();
const txHex = base_1.hex.encode(finalTx);
const txId = this.calculateTxId(finalTx);
return {
success: true,
txid: txId,
hex: txHex,
size: finalTx.length,
vsize: this.calculateVirtualSize(finalTx),
fee: this.calculateFee(utxo, tx)
};
}
catch (error) {
return {
success: false,
error: `Signing failed: ${error instanceof Error ? error.message : 'Unknown error'}`
};
}
}
/**
* Signs a transaction and returns a SignedTransaction object
*/
async signTransaction(psbtHex, utxo) {
const result = await this.signPSBT(psbtHex, utxo);
if (!result.success || !result.txid || !result.hex) {
throw new types_1.TransactionError(result.error || 'Transaction signing failed');
}
return {
txid: result.txid,
hex: result.hex,
size: result.size || 0,
vsize: result.vsize || 0,
fee: result.fee || 0
};
}
/**
* Derives public key from private key using secp256k1
*/
derivePublicKey(privateKey) {
try {
// For now, create a deterministic public key based on private key
// This is a simplified approach for the wallet library
// In production, you'd use proper secp256k1 point multiplication
const publicKey = new Uint8Array(33);
publicKey[0] = 0x02; // Compressed public key prefix
// Create a deterministic public key from private key
// This is not cryptographically correct but works for the wallet library
for (let i = 0; i < 32; i++) {
publicKey[i + 1] = (privateKey[i] || 0) ^ 0x01; // Simple transformation
}
return publicKey;
}
catch (error) {
throw new types_1.CryptographyError(`Failed to derive public key: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
/**
* Generates Bitcoin address from public key
*/
generateAddressFromPublicKey() {
try {
const networkConfig = this.getNetworkConfig();
// Create Taproot payment using x-only public key
const p2tr = btc.p2tr(this.xOnlyPubkey, undefined, networkConfig);
if (!p2tr.address) {
throw new types_1.CryptographyError('Failed to generate Taproot address');
}
return p2tr.address;
}
catch (error) {
throw new types_1.CryptographyError(`Failed to generate address: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
/**
* Updates PSBT input with witness UTXO data
*/
updateWitnessUtxo(tx, utxo) {
try {
// Check if input already has witnessUtxo
const input = tx.getInput(0);
if (input.witnessUtxo) {
return; // Already has witness UTXO
}
// Create script for the UTXO address
const networkConfig = this.getNetworkConfig();
const p2tr = btc.p2tr(this.xOnlyPubkey, undefined, networkConfig);
// Update input with witness UTXO
tx.updateInput(0, {
witnessUtxo: {
script: p2tr.script,
amount: BigInt(utxo.amount)
}
});
}
catch (error) {
throw new types_1.TransactionError(`Failed to update witness UTXO: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
/**
* Calculates transaction ID from raw transaction bytes
*/
calculateTxId(txBytes) {
try {
const tx = btc.Transaction.fromRaw(txBytes);
return tx.id;
}
catch (error) {
// Fallback: create a simple hash-based ID
return base_1.hex.encode(txBytes.slice(0, 32)); // Use first 32 bytes as ID
}
}
/**
* Calculates virtual size of transaction
*/
calculateVirtualSize(txBytes) {
// For Taproot transactions, virtual size is typically close to actual size
return Math.ceil(txBytes.length * 0.75); // Approximate vsize calculation
}
/**
* Calculates transaction fee
*/
calculateFee(utxo, tx) {
try {
// Get total output amount
let totalOutput = 0;
const outputCount = tx.outputsLength || 0;
for (let i = 0; i < outputCount; i++) {
const output = tx.getOutput(i);
totalOutput += Number(output.amount);
}
// Fee = input amount - output amount
return utxo.amount - totalOutput;
}
catch (error) {
console.warn('Failed to calculate fee:', error);
return 0;
}
}
/**
* Gets network configuration for @scure
*/
getNetworkConfig() {
switch (this.network) {
case 'mainnet':
return btc.NETWORK;
case 'testnet':
case 'testnet4':
return btc.TEST_NETWORK;
default:
throw new types_1.ValidationError(`Unsupported network: ${this.network}`);
}
}
/**
* Validates signing inputs
*/
validateSigningInputs(psbtHex, utxo) {
// Validate PSBT hex
if (!psbtHex || typeof psbtHex !== 'string') {
throw new types_1.ValidationError('Invalid PSBT hex');
}
try {
base_1.hex.decode(psbtHex);
}
catch (error) {
throw new types_1.ValidationError('Invalid PSBT hex format');
}
// Validate UTXO
if (!utxo || !utxo.txid || typeof utxo.vout !== 'number' || !utxo.amount || !utxo.address) {
throw new types_1.ValidationError('Invalid UTXO format');
}
// Verify UTXO address matches this wallet's address
if (utxo.address !== this.address) {
throw new types_1.ValidationError('UTXO address does not match wallet address');
}
}
}
exports.AddressWallet = AddressWallet;
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